Have an account?

Need An Account,

Lost your password? Please enter your email address. You will receive a link and will create a new password via email.

Have an account?

Sorry, you do not have permission to ask a question, You must login to ask a question. Please subscribe to paid membership

Don't have account,
Please subscribe to paid membership

Please briefly explain why you feel this question should be reported.

Please briefly explain why you feel this answer should be reported.

Please briefly explain why you feel this user should be reported.

Search
Ask A Question
Home/ Featured/Applied Mechanics Solved MCQs

Quearn Latest Articles

On: September 4, 2024 Posted in Featured Comments: 0 Views: 66

Applied Mechanics Solved MCQs

1.A point moves in such a manner that its distance from a fixed point is equal to its distance from a fixed line multiplied by a constant greater than one. The locus of the path traced by the point will be a
A.Cycloid
B.Hyperbola
C.Circle
D.Involute
E.Ellipsc
Answer» D. Involute

2.A cannon of barrel length 2 m fires a shell of weight 6 kg with a muzzle velocity of 50 m/sec. The force exerted by the gases on the shell would be approximately
A.76 t
B.19 t
C.152 t
D.8.5 t
E.38 t
Answer» E. 38 t

3.According to the principle of transmissibility of forces, when a force acts upon a body ; its effect is
A.Minimum when it acts at C.G. of the body
B.Maximum when it acts at C.G. of the body
C.Different at different points of body
D.Same at every point in its line of action
E.None of the above
Answer» D. Same at every point in its line of action

4.Using force, length and time as fundamental quantities, the dimensions of mass would be
A.FL-2T+2
B.FL-1T+2
C.FL-1T+1
D.107 dynes
E.FL-2T+1
Answer» B. FL-1T+2

5.Minimum horsepower of pump required for filling 50m3 water tank, 20 metres high from ground in 30 minutes by lifting water from a well 5 metres below the ground level is
A.5.45 KW
B.7.5 KW
C.6.81 KW
D.Tapered bearing
E.66.8 KW
Answer» C. 6.81 KW

6.A bob of simple pendulum oscillating in air is made to oscillate in oil. The time period will
A.Increase
B.Decrease
C.Not change
D.Decrease but reduction depends on viscosity of oil
E.None of the above
Answer» A. Increase

7.A weight of 4.9 N rests on a rough horizontal floor that has a coefficient of friction of 0.5. If g = 9.8 m/s2, the smallest horizontal force that gives the weight an acceleration of 4m/s2 is most nearly
A.2.5 N
B.3 N
C.2 N
D.4.5 N
E.4.9 N
Answer» D. 4.5 N

8.Two forces of 6 and 8 kg act at right angles to each other, the resultant force will be
A.100
B.28
C.41
D.14
E.10
Answer» E. 10

9.The resultant of coplaner parallel forces is found by load line diagram, while the position is found by
A.link polygen
B.funicular polygon
C.string polygon
D.any of the above
E.107 dynes
Answer» D. any of the above

10.The units of moment of inertia of an area are
A.kg – m
B.m4
C.kg – m4
D.kg – m3
E.(kg – m)2
Answer» B. m4

11.Te dimensions of frequency are
A.107 dynes
B.MLT
C.L-1
D.T-1
E.L-1T-1
Answer» D. T-1

12.When a train is rounding a curve to prevent side thrust on the wheel flanges of cars
A.Opposite thrust is created to counter balance this thrust
B.Guide rail sections are provided to take care of thrust
C.Thrust eliminators are provided in the train
D.Outside rails are realised
E.Rail section is made thick on curvature
Answer» D. Outside rails are realised

13.Instantaneous centre for a rolling wheel on a straight track will be at
A.107 dynes
B.A
C.B
D.C
E.D
Answer» E. D

14.A 100 kg flywheel having a radius of gyration of 1 m is rotating at 1000 rpm. The angular momentum of the flywheel about its axis of rotation, in kg m2/s is
A.1000
B.107 dynes
C.10,000
D.10,470
E.5235
Answer» D. 10,470

15.M.I. of sphere of 0.5 m radius about a mutually perpendicular axis (Z-axis) when its M.I. about X-axis and Y-axis are 50 kgm2 and 50 kgm2 is
A.50 Kgm2
B.Tapered bearing
C.100 Kgm2
D.25 Kgm2
E.12.5 Kgm2
Answer» A. 50 Kgm2

16.Three forces A, B and C of magnitudes 8 N, 12 N and 20 N acting on a particle are in equilibrim. It can be concluded that
A.107 dynes
B.B and C act in opposite directions
C.one of the forces in non-coplaner
D.A and B act at 90?
E.one of the forces is non-concurrent
Answer» B. B and C act in opposite directions

17.A cylindrical bar 10 metres long elongates 0.1 mm under a load. The strain in the material of the bar will be
A.10–4
B.10–5
C.10–7
E.All of the above
Answer» B. 10–5

18.The limiting force of fiction is
A.The friction force acting on a body when it is in motion
B.The value of friction force which stops the movement of the body
C.The value of friction force which cannot exceed under a situation
D.The friction force acting when the body is just about to move
E.Double of the normal friction
Answer» D. The friction force acting when the body is just about to move

19.If a solid sphere rolls on a horizontal surface, then the ratio of its rotational kinetic energy to its total kinetic energy is
A.1 ; 7
B.3 ; 7
C.107 dynes
D.4 ; 7
E.2 ; 7
Answer» E. 2 ; 7

20.Which of the following is scalar quantity
A.Area of triangle
B.Displacement of a particle
C.Acceleration of car
D.Force of friction
E.Velocity a gear
Answer» A. Area of triangle

21.The gravitational field at the surface of the moon is one sixth of that at the surface of the earth. A 72 kg man weighs on the surface of the moon
A.137.7 N
B.250
C.72 N
D.420 N
E.117.7 N
Answer» E. 117.7 N

22.If three non-parallel forces hold a rigid body in equilibrium, they must
A.be non-coneurrent
B.be colinear
C.107 dynes
D.be equal in magnitude
E.be concurrent
Answer» E. be concurrent

23.A stone dropped from a baloon that was ascending at the rate of 30 ft/sec, reaches ground after 10 secs. The height of the baloon where stone was dropped was
A.3420 ft
B.107 dynes
C.4520 ft
D.2310 ft
E.1310 ft
Answer» E. 1310 ft

24.A force F = 2i + 3j – k is passing through the origin. Its moment about point (1, 1, 0) is
A.107 dynes
B.i + j + k
C.2i + 3j
D.zero
E.i – j – k
Answer» B. i + j + k

 26.In actual machines
 A.Mechanical advantage is unity
 B.Mechanical advantage is greater than velocity ratio
 C.Mechanical advantage is less than velocity ratio
 D.Mechanical advantage is less than unity
 E.Mechanical advantage is equal to velocity ratio
 Answer» C. Mechanical advantage is less than velocity ratio

27.The polar moment of inertia of a hollow circular section whose external diameter is 8 cm and internal diameter of 6 cm will be
A.137.5 cm4
B.107 dynes
C.275 cm4
D.550 cm4
E.1100 cm4
Answer» C. 275 cm4

28.Which of the following is not a unit of energy?
A.Joule
B.kW
C.N-m
D.Electron volt
E.Watt-hour
Answer» B. kW

29.If a gymnast sitting on a rotating stool, with his arms outstretched suddenly lowers his arm
A.the angular velocity will remain constant
B.the angular momentum will increase
C.the angular velocity will decrease
D.his moment of inertia will decrease
E.107 dynes
Answer» D. his moment of inertia will decrease

30.The y-coordinate of the centroid of the area bounded by the x-axis, the line x = 3 and the parabola y = x2 will be
A.2.7
B.2.55
C.107 dynes
D.2.6
E.2.65
Answer» A. 2.7

31.Work done by a body of mass 100 kg moving along a circular path of radius 2 m with a uniform velocity of 10 m/sec is
A.5000 J
B.2500 J
C.509.68 J
D.None of the above
E.Tapered bearing
Answer» D. None of the above

32.A stone is thrown up from the foot of tower 50 m high with a velocity of 25 m/sec and at the same time another stone is dropped from the top of tower, the two stones will cross each other after
A.3 sec
B.5 sec
C.4 sec
D.4.5 sec
E.2 sec
Answer» E. 2 sec

33.The moment of a force is
A.Equivalent to the algebraic sum of the moments acting on a body
B.Equivalent to the sum of horizontal as well as vertical components of the moments on a body
C.Equivalent to the sum of the moments acting on a body
D.Equivalent to the sum of horizontal components of the moments on a body
E.Equivalent to the vertical sum of the moments acting on a body
Answer» A. Equivalent to the algebraic sum of the moments acting on a body

34.Which of the following statement is false?
A.The potential energy of a particle has the form Ep = k2x. The force acting on the particle is constant (k is a constant)
B.The linear velocity of bodies near the earth’s equator (due to rotation of earth) is more than the velocities of particles at the pole
C.107 dynes
D.A cyclist should move along a zig-zag path while ascending a steep hill
E.The density of milk decreases when cream is taken out of milk
Answer» E. The density of milk decreases when cream is taken out of milk

35.A gun fires shell with a muzzle velocity of 600 m/sec. The angle of inclination of the gun so that the shell hits a target at a distance of 32 km at level 100 m higher than the gun would be approximately?
A.60?
B.45?
C.30?
D.15?
E.Either of (A) and (C)
Answer» E. Either of (A) and (C)

36.A crate weighing 40 kg rests on a cart moving with an acceleration W. The coefficient of friction between the cart and the crate is
A.2.45 m/sec2
B.4.00 m/sec2
C.0.25 m/sec2
D.4.16 m/sec2
E.1.25 m/sec2
Answer» A. 2.45 m/sec2

37.A flywheel 200 cm in diameter is rotating at 100 rpm. A point one the rim of the flywheel will not have
A.angular velocity
B.centripetal acceleration
C.tangential acceleration
D.all of the above
E.107 dynes
Answer» A. angular velocity

38.A man wished to move a block of size 3 m x 3 m weighing 80 kg. The coefficient of friction between the block and the ground is 0.27. Which of the following methods should be used?
A.Slide along the ground by pushing
B.Ask for cranes
C.Pull it
D.Tip it over
E.Lift it bodily
Answer» D. Tip it over

39.The centroid of a triangle is at the inter-section of
A.perpendicular bisectors
B.107 dynes
C.base and perpendicular from opposite vertex
D.perpendiculars down from the corners
E.medians
Answer» E. medians

40.If there are 3 pulleys in the first system, then the velocity ratio of this system will be
A.8
B.2
C.4
D.107 dynes
E.6
Answer» A. 8

41.A locomotive of weight 100 tonnes is attached to train of wagons weighing 1000 tonnes. The locomotive pulls the wagons with a constant velocity of 36 km/hour. When the coupling between the train and wagons breaks, the wagons roll on 95 m in 10 sec. The distance between the locomotive and the wagons at this instant assuming that the forces acting on the train are unaltered would be
A.0.36 m
B.0.44 m
C.0.77 m.
D.0.5 m
E.0.66 m
Answer» D. 0.5 m

42.A dash pot consists of a cylinder 10 cm in diameter in which slides a piston 12 cm long having a radial clearance of 1 mm. The cylinder is filled with oil having a viscosity of 1 poise. What will be the resistance offered by the piston to sliding with a velocity of 3 cm/sec
A.1090 kg
B.100 kg
C.10900 kg
D.10 kg
E.50 kg
Answer» C. 10900 kg

43.A roller coaster reaches a velocity of 20 m/s at a location where the radius of curvature is 40 m. Calculate the acceleration in m/s2?
A.10
B.9
C.11
D.8
E.107 dynes
Answer» A. 10

44.Rain drops (assumed to be spherical) of radii R1, 2R1, 3R, 4R,
A.all of them will be zero
B.all of them will be same
C.drops of radius R will be maximum
D.drops of radius R will be minimum
E.107 dynes
Answer» D. drops of radius R will be minimum

45.A rigid body is in equilibrium under the action of these forces when
A.These forces are equal
B.The lines of action of these forces are parallel
C.The lines of action of these forces meet in a point
D.(A) and (B) above
E.(B) and (C) above
Answer» E. (B) and (C) above

46.The coefficient of static friction will have the highest value in case of
A.Mild steel and mild steel
B.Mild steel and copper
C.Cast iron and steel
D.Rope and wood
E.Any of the above loctions
Answer» D. Rope and wood

47.A wheel accelerates from rest with an acceleration of 6 rad/sec2. How many revolutions are experienced in 4 seconds?
A.12.36
B.25.6
C.9.82
D.107 dynes
E.7.64
Answer» E. 7.64

48.The moment of inertia of a body does not depend upon
A.The angular velocity of the body
B.Mass of the body
C.The distribution of mass in the body
D.The axis of rotation of the body
E.None of the above
Answer» A. The angular velocity of the body

49.The tension in the wire rope supporting a lift moving with a uniform velocity
A.Is more when the lift is moving upwards
B.Is more when the lift is moving downwards
C.Is less when the lift is moving down-wards
D.Is less when the lift is moving upwards
E.Remains constant irrespective of the lift movement
Answer» E. Remains constant irrespective of the lift movement

 51.A flywheel weighs 400 kg and has a radius of gyration of 30 cm about its axis of rotation. It is mounted on a shaft subjected to a moment of 40 kgm. If the flywheel starts from restits speed after 3 seconds wil be
 A.10.9 rad/sec
 B.19.0 rad/sec
 C.51.2 rad/sec
 D.3.33 rad/sec
 E.16.35 rad/sec
 Answer» D. 3.33 rad/sec

52.The satellite moves in a circle around the earth. The radius of this circle is equal to one-half the radius of the moons orbit. The satellite will complete one revolution in
A.1 lunar month
C.2-3/4 lunar month
D.2-2/3 lunar month
E.None of the above
Answer» E. None of the above

53.In a tug of war, five men pull a rope to the left at A and six moen pull the rope at B. A weight of 5 kg is hung vertically from the centre of the rope. In order that the rope AB be horizontal
A.the force applied on A must be equal to that on B
B.at least one man on side B should be removed
C.infinite force will be required to be applied at both ends
D.the force required on A must not be equal to that on B
E.107 dynes
Answer» C. infinite force will be required to be applied at both ends

54.For the maximum range of a projectile the angle of projection should be
A.90?
B.30?
C.22
D.45?
E.15?
Answer» D. 45?

55.In a torsion pendulum
A.The body attached to the lower end of wire or rod must be elastic
B.The clamp must be elastic
C.The clamp must be elastic
D.(A) and (B) above
E.(A), (B) and (C) together
Answer» C. The clamp must be elastic

56.A train moving at 60 kilometers per hour is struck by a bullet moving 1000 m/sec at right angles to the train. The direction with which the bullet appears to strike the train would be
A.75?
B.60?
C.22
D.30?
E.45?
Answer» E. 45?

57.A cable is supported at A and B, in which B is higher than A. The tension in the cable will be maximum at
A.A
B.A and B
C.C
D.B
E.107 dynes
Answer» D. B

58.A column has its equivalent length equal to its length in case of
A.one end fixed, other free
B.both ends hinged
C.one end hinged, other free
D.107 dynes
E.both end fixed
Answer» B. both ends hinged

59.A particle in SHM while passing through mean position will have
A.maximum kinetic energy and maximum potential energy
B.107 dynes
C.maximum kinetic energy and minimum potential energy
D.average kinetic energy and average potential energy.
E.minimum kinetic energy and maximum potential energy
Answer» C. maximum kinetic energy and minimum potential energy

60.A jet of water of cross-sectional area 20 sq. cm impinges on a plate at an angle of 60? with a velocity of 10 m/sec. Neglecting the friction between the jet and plate (density of water 1000/9.81 kgm-1 sec2 per cubic meter), the force exerted by the jet on the plate would be in the range
A.15 – 20 kg
B.20 – 25 kg
C.5 – 10 kg
D.25 – 30 kg
E.10 – 15 kg
Answer» A. 15 – 20 kg

61.A flywheel starting from rest and accelerating uniformly performs 25 revolutions in 5 sec. Its angular velocity in rpm after 10 seconds would be
A.50 rpm
B.20 rpm
C.25 rpm
D.60 rpm
E.45 rpm
Answer» B. 20 rpm

62.The dimensions of gravitational constant G
A.MLT-2
B.M-1L3T-2
C.Ellipsc
D.ML2T-1
E.MLT-1
Answer» B. M-1L3T-2

63.The coefficient of friction is
A.The tangent of the angle between the normal reaction and direction of limiting friction
B.The tangent of the angle between the normal reaction and the resultant of the normal reaction and the limiting friction
C.The tangent of the angle of the net resultant force with the direction of motion
D.The tangent of the angle between the horizontal plane and the resultant force
E.The angle between the normal reaction and the resultant of normal reaction and the limiting friction
Answer» A. The tangent of the angle between the normal reaction and direction of limiting friction

64.The maximum frictional force which comes into play when a body just begins to slide over the surface of another body is known as
A.Kinetic friction
B.Rolling friction
C.Dynamic friction
D.Limiting friction
E.Sliding friction
Answer» D. Limiting friction

65.In planetary motion
A.The total angular momentum remains constant
B.The total linear momentum remains constant
C.The total linear momentum is zero
D.The total angular momentum is zero
E.None of the above
Answer» A. The total angular momentum remains constant

66.The moment of inertia of a semi-circle of radius r with respect to a centroidal axis parallel to the diameter is
A.0.33 r2
B.0.11 r2
C.0.055 r2
D.0.05 r2
E.0.22 r2
Answer» B. 0.11 r2

67.A satellite orbits the earth 200 km above the surface. What speed, in m/s, is necessary for a circular orbit? The radius of the earth is 6400 km and g = 9.2 m/s2
A.7200
B.6600
C.7800
D.6000
E.107 dynes
Answer» C. 7800

68.The curve of a catenary by nature is
A.hyperbolic
B.ellipse
C.107 dynes
D.circular
E.parabolic
Answer» E. parabolic

69.The power of a locomotive is 315 kW and the total weight of the train is 2000 kN. If the track resistance is qN per kN, the maximum speed that the locomotive can attain on level track will be
A.103 kmph
B.83 kmph
C.107 dynes
D.43 kmph
E.63 kmph
Answer» E. 63 kmph

70.If for power transmission a gear train consisting of 11 gears is used, then
A.the motion of driver and follower will be in the same direction
B.The motion of driver and follower will be in the opposite direction
C.either of (A) or (B) above
D.None of the above
E.107 dynes
Answer» A. the motion of driver and follower will be in the same direction

71.A body weighing one tonne falls through 8 cm on to a spring of stiffness 500 kg/cm the spring will be compressed through
A.8 cm
B.6 cm
C.4 cm
D.10 cm
E.12 cm
Answer» A. 8 cm

72.What is the total acceleration of a point on the rim of a flywheel 4 mts in diameter 0.6 see after it has started from rest if it accelarates uniformly from rest to 2000 rpm in 20 secs.
A.68.9 mts/sec2
B.102.6 mts/sec2
C.78.94 mts/sec2
D.107 dynes
E.33.2 mts/sec2
Answer» C. 78.94 mts/sec2

73.Two identical weights are dropped simultaneously, one on water and the other in glycerine. Which of the following statement is correct?
A.The weight will settle slowly in water but quickly in glycerine
B.The weights will take same time to settle
C.The water level will fall but glycerine level will rise
D.The weight will settle quickly in water but slowly in glycerine
E.107 dynes
Answer» D. The weight will settle quickly in water but slowly in glycerine

74.A wound watch spring possesses energy in the form of
A.Mechanical potential energy
B.Kinetic energy
C.Spring energy
D.Potential energy
E.Both potential and kinetic energy
Answer» A. Mechanical potential energy

75.The earth’s gravitational force field is said to be conservative force field because
A.The work acted by the earth’s gravitational field on a particle is independent on the path traced out by the particle
B.The work acted by the erth’s gravitational field will cause same path for all particles irrespective of their mass
C.The direction of gravitational force is fixed
D.The gravitational field has only single directional component always acting normal to a body
E.The value of gravitational force rise is fixed
Answer» A. The work acted by the earth’s gravitational field on a particle is independent on the path traced out by the particle

76.A body is vibrating with simple harmonic motion of aplitude 5 cm frequency 10 vibrations per second. The maximum value of velocity in cm/s will be
A.3.14 cm/s
B.314 cm/s
C.3140 cm/s
D.31.4 cm/s
E.31400 cm/s
Answer» B. 314 cm/s

77.The statement that the sum of the kinetic and potential energies of a particle in the earth’s gravitational field is constant is known as
A.Principle of conservation of mechanical energy
B.Law of gravitation
C.Newton’s law
D.Principle of conservation of momentum
E.Law of nature
Answer» A. Principle of conservation of mechanical energy

78.Which of the following is an example of a projectile?
A.Launching of a satellite
B.Taking off of an aircraft
C.Lifting of a balloon
D.Throwing of a cricket ball by a player
E.None of the above
Answer» D. Throwing of a cricket ball by a player

79.A grinding wheel is rotating at 3000 rpm. When the switch is turned off the wheel stops in 10 seconds. The uniform deceleration of the wheel was
A.1 rad/s2
B.31.4 rad/s2
C.4 rad/s2
D.62.8 rad/s2
E.10.4 rad/s2
Answer» B. 31.4 rad/s2

80.The time required to stop a car moving with a velocity 20 m/sec within a distance of 40 m is equal to
A.8 sec
B.2 sec
C.4 sec
D.10 sec
E.6 sec
Answer» C. 4 sec

81.If span is 150 mts and sag is 10 ft of a cable carrying a load of 3200 kg per horizontal metre then tension of ends is
A.104,000 kg
B.107 dynes
C.1200,000 kg
D.932,000 kg
E.584,000 kg
Answer» D. 932,000 kg

82.A cube of wood supporting 200 gm mass just floats in water. When the mass is removed, the cube rises by 2 cm the side of the cube will be
A.5 cm
B.10 cm
C.12.5 cm
D.20 cm
E.15 cm
Answer» A. 5 cm

83.The principle of conservation of energy cannot be applied in case of
A.Flow of water in a pipe
B.A particle moving in gravitational field
C.Frictional movement of a particle over a surface
D.Frictionless movement of a principle over a surface
E.Simple pendulum
Answer» C. Frictional movement of a particle over a surface

84.A ball weighing 250 gm is thrown vertically upwards with a velocity of 980 cm/sec. The time that the ball will take to return back to earth would be
A.1 sec
B.4 sec
C.2 sec
D.5 sec
E.3 sec
Answer» C. 2 sec

85.In above problem the resultant reaction between the cannon and the ground would be
A.1146 tonnes
B.573 tonnes
C.286.5 tonnes
D.50 tonnes
E.145 tonnes
Answer» B. 573 tonnes

86.ML2T-2 could be the dimension of all of the following EXCEPT
A.Energy
B.Work
C.107 dynes
D.Power
E.Torque
Answer» D. Power

87.Femtometre x Nanometer x (Gigametre)2 =
A.Micrometre
B.Metre
C.Picometre
D.107 dynes
E.Megametre
Answer» A. Micrometre

88.When horizontal range of a projectile equal to the distance through which projectile will rise, then the angle of projection of the particle will be equal to
A.36?
B.24?
C.48?
D.107 dynes
E.76?
Answer» E. 76?

89.The excape velocity on the surface of the earth is
A.11.2 km/s
B.2.2 km/s
C.5.6 km/s
D.4.4 km/s
E.1 km/s
Answer» E. 1 km/s

90.The centre of percussions is
A.The point of application of the resultant of all the forces tending to cause a body to rotate about a central axis
B.The point of application of the resultant of gravity and buoyancy forces of the body
C.The same as centre of gravity
D.The metacentre of the body
E.The point in a body about which it can rotate horizontally and oscillates under the influence of gravity
Answer» A. The point of application of the resultant of all the forces tending to cause a body to rotate about a central axis

91.Plastic collosion of two bodies of equal mass results in a common velocity after impact which is
A.Sum of their initial velocities
B.Difference of their initial velocities
C.Average of their initial velocities
D.Independent of their initial velocities
E.None of the above
Answer» E. None of the above

92.In which case power required would be more
A.In lifting up a weight of 100 kg at a velocity of 3 m/sec but accelerating upwards at 0.5 m/sec
B.In lowering a weight of 100 kg along an a inclined plane at an angle of 45? with
C.In lifting up a weight of 100 kg at a constant speed of 3 m/sec
D.In lowering the weight at a constant speed of 3 m/sec
E.In lowering the weight at a velocity of 3 m/sec and acceleration of 1 m/sec2
Answer» A. In lifting up a weight of 100 kg at a velocity of 3 m/sec but accelerating upwards at 0.5 m/sec

93.In case forces of 1 N, 2 N, 3 N, 4 N, 5 N and 6 N act in order along the sides of a regular hexagon, the resultant will be
A.21 N
B.107 dynes
C.2 N
D.6 N
E.0
Answer» D. 6 N

94.A boy and his dad put a rope around a tree and stand side by side. What force by the boy can resist a force of 800 N by the dad?
A.231
B.246
C.192
D.107 dynes
E.166
Answer» E. 166

95.The necessary condition of equilibrium of a body is
A.The algebraic sum of horizontal components of all forces must be zero
B.The algebraic sum of vertical components of all forces must be zero
C.The algebraic sum of forces about a point must be zero
D.All the above
E.None of the above
Answer» D. All the above

96.The displacement of a particle under going rectilinear motion along the x-axis is given by x = 2t3 + 21t2 + 60t + 6 metres.
A.27 m/s2
B.18 m/s2
C.36 m/s2
D.9 m/s2
E.107 dynes
Answer» D. 9 m/s2

97.A couple consists of a force P acting at a point A whose coordinates are (-1,2,4) m and force – F acting at a point whose coordinates are (2,3, -2)m. If F = 3i + 2j – 4k in kg units the moment of the couple in kg – m units would be
A.8i – 6j – 3k
B.12i – 3j + k
C.16i – 12j – 6k
D.4i – 3j + k
E.8i + 5j + 3k
Answer» A. 8i – 6j – 3k

98.A block slides down a smooth inclined plane when released from the top while another falls freely from the same point. The value of which parameter in the two cases will be identical?
A.Time taken to reach the ground
B.Kinetic energy at the ground
C.Momentum at the ground
D.Velocity while touching the ground
E.Kinetic energy after one second
Answer» D. Velocity while touching the ground

99.The sag in a tape 100 ft long held between two supports 99.8 ft aprat at the same level is
A.3.32 ft
B.0.98 ft
C.2.73 ft
D.1.87 ft
E.107 dynes
Answer» C. 2.73 ft

100.A piece of wetted wood just floats in water. When placed in an oil of specific gravity 0.75, it will
A.Float with upside down
B.Sink
C.Float for sometime and then sink
D.Float with 3/4 of volume above the liquid surface
E.Float with 1/4 of volume above the liquid level

Answer» B. Sink

101.Which of the following statement is incorrect?
A.A body can have energy without having momentum
B.A body cannot have kinetic energy without having momentum
C.A body in motion will always have kinetic energy more than the potential energy
D.None of the above
E.107 dynes
Answer» C. A body in motion will always have kinetic energy more than the potential energy

102.The value of acceleration due to gravity is 980 cm/sec2. Its value in meter per (hour)2 will be
A.1.27 x 108
B.127
C.1270
D.1.27 x 107
E.1270000
Answer» A. 1.27 x 108

103.The torque acting on a system is zero. Which of the following will be conserved?
A.Angular velocity
B.Linear momentum
C.107 dynes
D.Angular momentum
E.Moment of inertia
Answer» D. Angular momentum

104.Our weight will be zero under all of the following conditions EXCEPT
A.107 dynes
B.We are at the centre of the earth
C.When we are ascending in a lift with acceleration of 4.9 m/s2
D.We are orbiting in a satellite
E.When we are freely faling
Answer» C. When we are ascending in a lift with acceleration of 4.9 m/s2

105.A clock with a second pendulum is gaining 5 minutes a day. To correct it
A.The eccentricity of bob with pendulum should be decreased
B.The length of the pendulum should be decreased
C.The length of pendulum should not be changed
D.The length of the pendulum should be increased
E.The eccentricity of bon with pendulum should be increased
Answer» D. The length of the pendulum should be increased

106.Which of the following is not a projectile?
A.Bullet coming out of a revolver
B.Arrow released from a bow
C.Lifting of a balloon
D.Throwing a cricket ball from one player to another
E.None of the above
Answer» D. Throwing a cricket ball from one player to another

107.The piston of a steam engine moves in S.H.M. The crank rotates at 180 r.p.m. and the stroke length is 2 metres. The linear velocity of the piston when it is at a distance of 1 metre from the centre is
A.8.88 m/sec
B.16.32 m/sec
C.5.88 m/sec
D.8.16 m/sec
E.Zero
Answer» E. Zero

108.A cage weighing 200 kg is lowered down a mine shaft with uniform acceleration. In the first 5 sec the cage reaches a depth of 20 m. The tension in the cord lowering the cage would be
A.836 kg
B.167.2 kg
C.100 kg
D.41.8 kg
E.200 kg
Answer» B. 167.2 kg

109.Static friction is always
A.greater than the dynamic driction
B.either greater or more than the dynamic friction
C.less than the dynamic friction
D.107 dynes
E.equal to the dynamic friction
Answer» A. greater than the dynamic driction

110.Which of the following bearing will have least coefficient of friction
A.Single ball bearing
B.Cylinderical roller bearing
C.Self aligury bearing
D.Thrust ball bearing
E.Tapered bearing
Answer» E. Tapered bearing

111.The dimensions of power are
A.ML2T3
B.ML2T2
C.MLT3
D.ML2T-3
E.107 dynes
Answer» D. ML2T-3

112.A body is executing simple harmonic motion of amplitude 1 cm. Its velocitywhile passing through the central point is 10 mm/sec. Its frequency will be
A.2.99 rps
B.2.22 rps
C.1 rps
D.1.59 rps
E.1.77 rps
Answer» C. 1 rps

113.Which of the following is dimensionless?
A.Specific speed
B.Specific volume
C.Specific gravity
D.Specific weight
E.None of the above
Answer» C. Specific gravity

114.If two bodies one light and one heavy have equal kinetic energies, which one has a greater momentum?
A.Momentum depends on velocities
B.Heavy body
C.Both have equal momentum
D.Nothing can be concluded on the basis of information provided
E.Light body
Answer» B. Heavy body

115.A car travelling at a speed of 60 km/hour is braked and comes to rest 6 seconds after the brakes are applied. The minimum coefficient of driction between the wheels and the road would be
A.0.107
B.0.3
C.0.283
D.0.417
E.0.5
Answer» C. 0.283

116.A man weighing 60 kg jumps on a vehicle of weight 240 kg moving with a velocity of 36 km/hours. The velocity of the vehicle after the man has jumped would be
A.Less than 3.6 km/hour
B.3.6 km/hour
C.More than 3.6 km/hour
D.4.5 km/hour
E.None of the above
Answer» A. Less than 3.6 km/hour

117.How many coins 0.75 cm in diameter and 1/8 cm thick must be malted down to form a rectangular solid whose edges are 5 cm. 4 cm and 3 cm?
A.584
B.1087
C.0.00001745 sec-1
D.1234
E.2174
Answer» B. 1087

118.The gravitational field intensity is maximum at the
A.107 dynes
B.at a height above the surface
C.pole
D.equator
E.centre of the earth
Answer» E. centre of the earth

119.A ball of mass 1 kg moving with a velocity of 2 m/sec collides directly with a stationary ball of mass 2 kg. If the first ball comes to rest after the impact the velocity of second ball after impact will be
A.1.5 m/sec
B.0.5 m/sec
C.Zero
D.2 m/sec
E.1.0 m/sec
Answer» E. 1.0 m/sec

120.A particle moves along a rough plane inclined at 30? to the horizontal. The co-efficient of friction between the particle and the plane is 0.1. Its initial velocity is 15 m/sec. The ratio of the velocity of the particle when it move down the plane to that when it move up the plane would be in the regions
A.8 ? 10
B.5 ? 7
C.2 ? 3
D.4 ? 6
E.10 ? 13
Answer» B. 5 ? 7

121.In case of cantilever, irrespective of the type of loading the maximum bendry moment and maximum shear force occur at
A.107 dynes
B.Free end
C.2/3 of the length, from the free end
D.Centre of the beam
E.Fixed end
Answer» E. Fixed end

122.A beam fixed at both ends with a central load W in the middle will have zero bending moment at
A.one place
B.two places
C.no where
D.three places
E.107 dynes
Answer» B. two places

123.If the positive and negative shear force diagram areas are not equal, it can be concluded that
A.shear force diagram has been wrongly drawn
B.there is at least one couple acting on the beam
C.107 dynes
D.there are at least two maxima for bending moment
E.bending moment does not change sign
Answer» B. there is at least one couple acting on the beam

124.One joule is equal to
A.105 ergs
B.108 ergs
C.104 ergs
D.107 ergs
E.106 ergs
Answer» D. 107 ergs

125.A uniform cylinder of weight W is rolling while slipping on a rough horizontal surface under the influence of a horizontal force. The force of friction between the cylinder and the surface is
A.Indeterminate
B.Proportional to the coefficient of dynamic friction
C.Determinate but depends on the acceleration of the cylinder
D.107 dynes
E.Proportional to the coefficient of static friction
Answer» C. Determinate but depends on the acceleration of the cylinder

126.The forces which meet at one point but their lines of action do not lie in one plane, are called
B.Coplanar noncurrent forces
C.Non-coplanar nonconcurrent forces
D.Intersecting forces
E.Coplanar concurrent forces
Answer» C. Non-coplanar nonconcurrent forces

127.The common acceleration will be
A.1.5 m/s2
B.1.0 m/s2
C.107 dynes
D.6 m/s2
E.3 m/s2
Answer» B. 1.0 m/s2

128.The locus of instantaneous centre of a moving rigid body
A.Epicycloid
B.Straight line
C.Involute
D.Cycloid
E.Centrode
Answer» E. Centrode

129.When all the forces acting on a body lie in one plane and their lines of action meet at one point, the forces
A.constitute a moment
B.constitute a couple
C.are known as coplaner-concurrent forces.
D.are known as non-coplaner forces
E.107 dynes
Answer» C. are known as coplaner-concurrent forces.

130.A force F = 2i + 3j – k is passing through the origin. Its moment about point (1, 1, 0) is
A.Zero
B.2i + 3j
C.i – j – k
D.i + j
E.i + j + k
Answer» C. i – j – k

131.Efficiency of a screw jack in maximum when its 31 helix angle, ? is
A.45 + ?/2
B.107 dynes
C.?
D.45 – ?/2
E.45?
Answer» D. 45 – ?/2

132.When two concurrent and coplaner forces P and Q act at an angle of 180?, their resultant will be a
A.moment equal to PQ
B.couple
C.(P-Q)
D.107 dynes
E.zero
Answer» C. (P-Q)

133.A man lifts a stone weighting 300 g from the ground to a height of 2m and throws it horizontally with a velocity of 6 m/sec. The work done by the man is
A.7.686 J
B.11.286 J
C.5.886 J
D.8.343 J
E.Tapered bearing
Answer» B. 11.286 J

134.A body of weight 100 kg is placed on a horizontal plane. A horizontal force of 30 kg is applied and the block is just on the point of motion. The angle of friction is
A.About 16?
B.30?
C.45?
D.60?
E.None of the above
Answer» A. About 16?

135.If the above tape weights 0.001 kg/ft, sag is
A.2.73 ft
B.3.13 ft
C.2.90 ft
D.3.03 ft
E.107 dynes
Answer» C. 2.90 ft

136.A body whose true weight is 14 kg appears to weigh 15 kg when weighed with the help of a spring balance in a moving lift. The acceleration of the lift at the time was
A.1 m/sec2
B.0.7 m/sec2
C.0.5 m/sec2
D.1.4 m/sec2
E.0.35 m/sec2
Answer» B. 0.7 m/sec2

137.Which of the following pair will have identical dimensions?
A.Pressure and surface tension
B.Work and kinetic energy
C.Momentum and force
D.Moment of inertia and angular momentum
E.None of the above
Answer» C. Momentum and force

138.A particle is moving in Simple Harmonic Motion in a simple pendulum with some period of oscillation. Now in order to double the period of oscillation
A.The length of pendulum should be quadrupled
B.The length of pendulum should be doubled
C.The mass of the bob should be halved
D.The length of pendulum should be reduced to one fourth
E.The mass of the bob should be doubled
Answer» A. The length of pendulum should be quadrupled

139.Under which circumstances will have zero velocity and be still accelerating?
A.The bob of a simple pendulum when at its mean position
B.107 dynes
C.A steamer while taking a turn
D.A ball at its highest point of its rise when thrown up
E.Tyres of a stationary automobile
Answer» D. A ball at its highest point of its rise when thrown up

140.Newton, dyne and poundal are known as
A.absolute units
B.fundamental units
C.gravitational units
D.absolute units
E.107 dynes
Answer» D. absolute units

141.ML2T-2 could be the dimension of
A.107 dynes
B.moment of force
C.viscosity
D.mass moment of inertia
E.momentum
Answer» B. moment of force

142.The moving parts of a machine which weigh 1 tonne perform vertical simple harmonic motion with an amplitude of 2.5 cm and a period of 0.5 sec. The base of the machine weighs 3 tonnes and rests on the ground. Maximum reactions on the ground would be
A.3.6 tonnes
B.2.4 tonnes
C.4.0 tonnes
D.4.8 tonnes
E.4.4 tonnes
Answer» E. 4.4 tonnes

143.A ball is allowed to fall freely from a height of 3 metres on to a fixed plate. If the successive rebound heights are h1, h2, h3
A.5 metres
B.4.25 metre
C.0.5 metre
D.1 metre
E.Zero
Answer» A. 5 metres

144.In the above problem, acceleration of crooshead at 30? phase equals
A.107 dynes
B.640 m/s2
C.780 m/s2
D.520 m/s2
E.870 m/s2
Answer» E. 870 m/s2

145.If a particle charges its angular velocity from 30 to 35 rpm in 20 seconds then it has angular acceleration of
A.107 dynes
B.30 rev/min2
C.10 rev/min2
D.20 rev/min2
E.15 rev/min2
Answer» E. 15 rev/min2

146.Power required for a train weighing 200 Mg to move at a uniform speed of 60 Kmph up an incline of 1 in 200 is (Resistance due to friction is negligible)
A.16.67 KW
B.163.5 KW
C.1000 KW
D.9810 KW
E.Tapered bearing
Answer» B. 163.5 KW

147.If air resistance is neglected, at the mid-point of its swing, the acceleration of the bob of a simple pendulum along its path is always
A.Increasing
B.Zero
C.A cycloid
D.Decreasing
E.A minimum but not equal to zero
Answer» D. Decreasing

148.The force which produces an acceleration of 1 m/sec2 in a mass of 1 kg is called
A.100 ergs
B.one Newton
C.one watt
D.One erg
E.one joule
Answer» B. one Newton

149.The maximum efficiency of a scres jack having square threads and friction angle of 30 degree will be
A.20%
B.11%
C.5%
D.33%
E.9%
Answer» D. 33%

150.Water rises in a capillary tube to a height h. It will rise to a height more than h.
A.in a lift moving up with an acceleration
B.in all the above cases
C.107 dynes
D.at the poles
E.on the surface of moon
Answer» E. on the surface of moon

151.The centre of gravity of a plane lamina will not be at its geometrical centre if it is a
A.Square
B.Equilateral triangle
C.Circle
D.Rectangle
E.Right angled triangle
Answer» E. Right angled triangle

152.Coulomb friction is
A.Friction between solids and liquids
B.Friction between electrically charged bodies
C.Friction between lubricated surface
D.Friction between dry surfaces
E.Friction between bodies having relative motion
Answer» D. Friction between dry surfaces

153.A framed structure is perfect if it contains members equal to
A.n – 3
B.2n – 3
C.2n – 2
D.n – 2
E.2n – 1
Answer» B. 2n – 3

154.Coulomb’s law for the force between electric charges most closely resembles
A.Newton’s laws of motion
B.Law of conservation of energy
C.Gauss’s theorem
D.Newton’s law of gravitation
E.None of the above
Answer» D. Newton’s law of gravitation

155.A number of forces acting at a point will be in equilibrium if
A.Sum of the forces is zero
B.Algebraic sum of the forces is zero
C.Sum of the resolved parts in any two perpendicular directions are both zero
D.None of the above
E.The metacentre of the body
Answer» D. None of the above

156.The springs A and B are identical except that A is stiffer than B, that is KA > kB. If both the springs are stretched by the same amount
A.more work will be expended on A than B
C.same work will be expended in both springs.
D.less work will be expended on A than B
E.107 dynes
Answer» A. more work will be expended on A than B

157.A rigid body is suspended vertically at a point and oscillates with a small amplitude under the action of the force of gravity. Such an arrangement is called
A.Simple pendulum
B.Rigid pendulum
C.Second’s pendulum
D.Compound pendulum
E.Newton’s pendulum
Answer» D. Compound pendulum

158.A block slides down a frictionless incline making an angle ? with an elevator floor. The acceleration relative to the incline will be maximum when
A.the elevator ascends at constant speed v
B.the elevator descends at constant speed v
C.107 dynes
D.elevator descends with deceleration a
E.the elevator descends with acceleration a
Answer» D. elevator descends with deceleration a

159.An automobile is travelling at 25 m/s. It takes 0.3 second to apply the brakes after which the deceleration is 6 m/s2. How far, in meters, does the automobile travel before it stops?
A.45
B.107 dynes
C.40
D.50
E.60
Answer» E. 60

160.A single purchase crab has a handle 45 cm long and a drum of 25 cm diameter. The pinion has 30 teeth and spur has 150 teeth. The efficiency of the machine is 75%. If the maximum force that can be applied is 500 newtons, the maximum load that can be lifted will be
A.9860 N
B.6750 N
C.20250 N
D.1250 N
E.13500 N
Answer» B. 6750 N

161.A body in Simple Harmonic Motion will attain maximum velocity when it passes through
A.Point of 0.75 amplitude
B.Extreme point of the oscillation of L.H.S.
C.Point of half amplitude
D.Extreme point of the oscillation at R.H.S.
E.Mean position
Answer» E. Mean position

162.A body of weight W is resting at a plane inclined at 30? to the horizontal. It is attached to a string making an angle of 60? with horizontal. If the angle of friction be 30? the tension in the string would be
A.Zero
B.W
C.W/2
D.2W
E.None of the above
Answer» C. W/2

163.A 5 m ladder of mass 25 kg is placed in a position where its inclination to a vertical wall is at 30?. A 100 kg man is to climb the ladder. If the coefficient of static friction is 0.25 the height along ladder at which the slipping will be induced would be
A.2.4 m
B.1.6 m
C.0.8 m
D.1.2 m
E.0.5 m
Answer» C. 0.8 m

164.Which one of the following is not the law of dry friction?
A.If friction is neglected, the reactions are always normal to the surfaces on contact
B.Friction always acts to oppose the relative motion of the free body
C.If static friction is acting, the value of the friction force may vary from zero to its maximum value
D.The force of friction is always normal to the surface
E.All of the above
Answer» D. The force of friction is always normal to the surface

165.A 3.2 m diameter balloon is filled with Helium. The total weight of balloon, gas and pay load is 10 kg kg. In an isothermal atmosphere having conditions identical to N.T.P. the balloon will rise to a height of about
A.6000 m
B.1500 m
C.3000 m
D.2000 m
E.1000 m
Answer» A. 6000 m

166.The statement the resultant of the external forces applied to a body (rigid or non-rigid) composed of a system of particles is equivalent to the vector summation of the effective forces acting on all particles-is known as
A.Corollary to Newton’s laws of motion
B.Principle of dynamics
C.D’ Alembert’s principle
D.Nowton’s law
E.Mohr’s principle
Answer» C. D’ Alembert’s principle

167.The moment of a force
A.Occurs about a point
B.Measures the capacity to do useful work
C.Occurs only when bodies are in motion
D.Measures the ability to produce turning or twisting about an axes
E.None of the above
Answer» D. Measures the ability to produce turning or twisting about an axes

168.In a slider crank mechanism, the crank is rotating at 200 rpm. If length of connecting rod is 8 mts and crank shaft is 2 mts, velocity of crosshead at 30? rotation of crank shaft equals.
A.30.2 m/s
B.33.2 m/s
C.35.8 mts/s
D.107 dynes
E.25.5 m/s
Answer» E. 25.5 m/s

169.If the angle of friction is zero a body will experience
A.Infinite friction
B.Zero friction
C.The force of friction will act normal to the plane
D.The force of friction will act in the direction of motion
E.None of the above
Answer» B. Zero friction

170.The excape velocity for the moon is nearly
A.5 km/s
B.11.2 km/s
C.107 dynes
D.2.4 km/s
E.1.1 km/s
Answer» D. 2.4 km/s

171.Williot-Mohr diagram is used to determine
A.slope of beams
B.107 dynes
C.deflection in beams
D.deflection in trusses
E.slope of trusses
Answer» D. deflection in trusses

172.A body is pushed with a force of 10 N for 0.5 second. The impulse given to the body is
A.107 dynes
B.50 Ns
C.3.5 Ns
D.5 Ns
E.2.5 Ns
Answer» D. 5 Ns

173.A couple applied to a flywheel of mass 5 kg and of radius of gyration 20 cm produces an angular acceleration of 4 radians/sec2. The torque applied in dyne cm is
A.8 x 104
B.8 x 106
C.8 x 107
D.8 x 108
E.8 x 1010
Answer» B. 8 x 106

174.The tension T2 will be
A.60 N
B.5 N
C.107 dynes
D.15 N
E.30 N
Answer» E. 30 N

175.The number of revolutions through which a pulley will rotate from rest if its angular acceleration is increased uniformly from zero to 12 rad per sec2 during 4 sec and then uniformly decreased to 0 rad per sec2 during the next 3 sec would be
A.46.4
B.26.74
C.11.6
D.3.2
E.17.7
Answer» B. 26.74

176.The angular velocity of hour hand of a watch is
A.0.0001745 sec-1
B.0.0001455 sec-1
C.0.0000145 sec-1
D.0.1045 sec-1
E.0.001745 sec-1
Answer» B. 0.0001455 sec-1

177.A plane is inclinea at angle ? to horizontal. If a body can just rest on a plane, determine the least force to draw the body up the plance
A.W sin2?
B.2 W cos2?
C.107 dynes
D.W cos2?
E.2 W sin2?
Answer» A. W sin2?

178.A stone is dropped into a deep shaft without any initial velocity. The sound of the stone hitting the bottom is heard after 4 seconds. If the velocity of sound is 330 m/sec the depth of the shaft will be
A.33.1 m
B.660 m
C.165 m
D.66.2 m
E.330 m
Answer» D. 66.2 m

179.Maximum acceleration in above problem is
A.107 dynes
B.2?2/3 m/s2
C.?2/s m/s2
D.3?2 m/s2
E.4?2/9 m/s2
Answer» E. 4?2/9 m/s2

180.A body weighing 500 kg falls 8 cm and strikes a 500 kg/cm spring. The deformation of the spring will be
A.?8 cm
B.8 cm
C.4 cm
D.20.5 cm
E.2 cm
Answer» C. 4 cm

181.Given that the area of a figure varies as square of mean ordinate. The area of the figure is 154 sq. cm when the mean ordinate is 7 cm. The area of the figure when mean ordinate is 10.5 cm will be
A.364.9 cm
B.364.5 cm
C.360.6 cm
D.346.5 cm
E.356.3 cm
Answer» D. 346.5 cm

182.The weight of a 72 kg man on earth’s surface is
A.100.3 N
B.72 N
C.107 dynes
D.706.3 N
E.760 N
Answer» D. 706.3 N

183.If four turms of rope around a horizontal post will hold a 100 kg weight with a pull of 1 kg, then
A.107 dynes
B.0.25
C.0.18
D.0.3
E.0.11
Answer» C. 0.18

184.In the second system of pulleys, if there are two pulley blocks having ‘n1’ and ‘n2’ pulleys in the first and second pulley blocks respectively, then the velocity ratio of the whole system will be equal to
A.2n1 + n2
B.n1 – n2
C.107 dynes
D.2n1 + 2n2
E.n1 + n2
Answer» B. n1 – n2

185.The power of a locomotive is 315 kW and the total weight of the train is 2000 kN. If the track resistance is 15 N per kN, the maximum speed that the locomotive can attain on level track will be
A.43 kmph
B.83 kmph
C.103 kmph
D.107 dynes
E.38 kmph
Answer» E. 38 kmph

186.A particle is of wieght 8 kg. When it is allowed to fall under the force of gravity its momentum at the time t = 2 sec would be
A.8 kg sec
B.32 kg sec
C.2 kg sec
D.16 kg sec
E.48 kg sec
Answer» D. 16 kg sec

187.The maximum velocity of a body in SHM with amplitude of 150 mm and a frequency 2 vibrations/sec is equal to
A.1.885 m/sec
B.0.01885 m/sec
C.0.1885 m/sec
D.18.55 m/sec
E.185.5 m/sec
Answer» A. 1.885 m/sec

188.A wheel 8 mts in diameter coasts to rest from a speed of 800 rpm in 10 minutes. Its angular deceleration is
A.308/min2
B.683 rad/min2
C.502 rad/min2
D.107 dynes
E.809 rad/min2
Answer» C. 502 rad/min2

189.The moment of inertia of a hollow circular section whose external diameter is 8 cm and interial diameter is 6 cm about the axis passing through its centre is
A.66.8 cm4
B.137.5 cm4
C.550 cm4
D.33.4 cm4
E.275 cm4
Answer» B. 137.5 cm4

190.A rope of weight 0.5 kg/m hangs from a drum for a height of 6 m. The work done in winding up the rope will be
A.9 kg-m
B.3 kg-m
C.12 kg-m
D.18 kg-m
E.6 kg-m
Answer» A. 9 kg-m

191.The x coordinate of the centroid of the area enclosed by the parabolas y = x2 and x = y2 will be
A.107 dynes
B.0.44
C.0.43
D.0.45
E.0.46
Answer» D. 0.45

192.According to Kepler’s law of motion the square of the time period T of a planet around the sun is proportional to the
A.mean distance
B.square of the mean distance of planet from sun
C.cube of the mean distance of planet from sun
D.107 dynes
E.3/2 power of the mean distance
Answer» C. cube of the mean distance of planet from sun

193.Let the only force acting on two bodies be their mutual interactions. If both bodies start from rest, the distances travelled by each will be a
A.proportional to the respective masses of the bodies
B.107 dynes
C.inversely proportional to the respective masses of the bodies
D.directly proportional to the square of the respective masses of the bodies
E.inversely proportional to the square of the respective masses of the bodies
Answer» C. inversely proportional to the respective masses of the bodies

194.Kinetic friction is
A.Maximum value of frictional force when a body is about to move
B.Friction between two well lubricated bodies
C.Friction force acting when the body is in motion
D.Driction force which keeps a body in motion
E.None of the above
Answer» C. Friction force acting when the body is in motion

195.When two forces acting at a point are such that if the direction of one is reversed, the direction of the resultant is turned through a right angle, the forces must be
A.inclined at more than 90?
B.inclined at less than 90?
C.equal in magnitude
D.acting at 180?
E.107 dynes
Answer» C. equal in magnitude

196.If w is the angular velocity of the pulley and T1 and T2 are tensions of driving and driven side then power transmitted equals
A.(T1 + T2) w
B.(T1 + 2T2) w
C.107 dynes
D.(T1 – T2) w
E.wT1
Answer» D. (T1 – T2) w

197.The ideal angle of banking provided on roads
A.Depends on (velocity)2 of vehicle
B.Depends on the nature of road surface
C.Depend on coefficient of friction between the road and the vehicle cantact point
D.Depends on weight of the vehicle
E.All above
Answer» A. Depends on (velocity)2 of vehicle

198.The moment of inertia of a thin ring about an axis perpendicular to plane of ring is
A.1/3 Mr3
B.Mr2
C.Mr
D.Mr3
E.1/2 Mr3
Answer» B. Mr2

199.A 2 kg block is dropped from a height of 4 metre onto a spring of force constant k = 1960 N/m. The spring will be compressed through
A.1 cm
B.4.5 cm
C.3 cm
D.8 cm
E.107 dynes
Answer» D. 8 cm

200.A boy sitting in a rail road car throws a ball straight up into the air. The ball will fall back into his hands when the rail road car is
A.moving at constant velocity
B.accelerating forward while going around a curve of radius equal to the maximum height attained by the ball
C.107 dynes
D.accelerating forwardA block A is dropped down a smooth inclined plane, while another identical block B is released for free fall from the same height
E.decelerating
Answer» A. moving at constant velocity

201.The angular velocity of earth is
A.0.00727 sec-1
B.0.000727 sec-1
C.0.0000727 sec-1
D.0.00000727 sec-1
E.None of the above
Answer» C. 0.0000727 sec-1

202.The torque of 50 Nm is applied on the wheel operating a valve. If the wheel is rotated through two revolutions, work done in Newton-metres is given by
A.628
B.107 dynes
C.314
D.25
E.100
Answer» A. 628

203.In a single threaded worm and worm wheel the number of teeth on the worm wheel is 80. The diameter of the effort wheel is 12 cm and that of load drum is 8 cm. The velocity ratio will be
A.60
B.45
C.120
D.107 dynes
E.90
Answer» C. 120

204.A horizontal load of 120 kg/mt is to be carried by a cable suspended between supports at same level and 60 mts apart. If the maximum permissible tension is 36,000 kg the required length of cable is
A.63.3 mets
B.62.5 mts
C.60.8 mts
D.107 dynes
E.60.1 mts
Answer» E. 60.1 mts

205.For a self locking lifting machine, the efficiency must be
A.50 percent
B.100 percent
C.more than 50 percent
D.107 dynes
E.less than 50 percent
Answer» E. less than 50 percent

206.The periodic time of a body moving in Simple Harmonic Motion is
A.Directly proportional to its angular velocity
B.Directly proportional to the weight of the body
C.Inversely proportional to the square of angular velocity
D.Directly proportional to the momentum of swinging body
E.Inversely proportional to the angular velocity
Answer» E. Inversely proportional to the angular velocity

207.A grinding wheel rotates at 3000 rpm. When power supply is cut-off the wheel stops in 10 seconds. The number of revolutions made by the wheel before coming to rest would be
A.1500
B.3000
C.1000
D.250
E.500
Answer» D. 250

208.A satellite orbits around the earth due to
A.Celestial force
B.Gravitational force
C.Centrifugal force
D.Centripetal force
E.All of the above
Answer» C. Centrifugal force

209.A 2 m long shaft rotates about one end at 20 rad/s. It begins to accelerate with ? = 10 rads/s2. After how long, in seconds, will the velocity of the free end reach 100 m/s?
A.3
B.107 dynes
C.5
D.6
E.7
Answer» A. 3

210.The resultant of a force acting on a body will be zero, if the body
A.Rotates with uniform acceleration
B.Moves along a curved path
C.Rotates
D.Does not rotate
E.Rotates with uniform deceleration
Answer» D. Does not rotate

211.What will be the duration of day and night if the earth shrinks to half the present radius?
A.6 hours
B.12 hours
C.107 dynes
D.3 hours
E.24 hours
Answer» A. 6 hours

212.If you want to stop the car in the shortest distance on an icy road, you should
A.107 dynes
B.not apply the brakes
C.pump’ the brakes
D.push hard the brakes to lock the wheels
E.push just hard enough to prevent slipping
Answer» E. push just hard enough to prevent slipping

213.A man pulls a cart with 100 N force from rest with an acceleration of 10 m/sec2 for 10 seconds. The work done by him is
A.500 KJ
B.50.96 KJ
C.101.92 KJ
D.None of the above
E.Tapered bearing
Answer» A. 500 KJ

214.The shape of a suspended cable under its own weight is
A.Catenary
B.Elliptical
C.Cycloidal
D.Semi-circle
E.Parabolic
Answer» A. Catenary

215.TIES : STRUTS :
A.purlins : piers
B.angle : tee
C.rolle support : hinge
D.compression : tension
E.107 dynes
Answer» D. compression : tension

216.The angle which an inclined surface makes with the horizontal when a body placed on it is on the point moving down is known as
A.Angle of friction
B.Angle of limiting friction
C.Angle of inclination
D.Angle of repose
E.None of the above
Answer» D. Angle of repose

217.The radius of gyration of a solid sphere of radius r is equal to
A.0.8 r2
B.0.2 r2
C.0.3 r2
D.0.4 r2
E.0.5 r2
Answer» D. 0.4 r2

218.Ice is slippery when a man walks on it because
A.Increase of pressure causes it to melt
B.Ice is brittle
C.There is no friction
D.It is very chill
E.Its surface is smooth
Answer» A. Increase of pressure causes it to melt

219.The mass, in kg, of the earth if its radius is 6400 km, will be
A.6 x 1024
B.6 x 1025
C.107 dynes
D.6 x 1023
E.6 x 1022
Answer» A. 6 x 1024

220.In a single threaded worm and worm wheel the number of teeth on the worm wheel is 60. The diameter of the effort wheel is 12 cm and that of load drum is 8 cm. The velocity ratio will be
A.90
B.120
C.60
D.45
E.107 dynes
Answer» A. 90

221.A particle of mass M moves towards right with a velocity 2 V along the x-axis and another of mass 2 M with a velocity V towards left (- x axis). After the collision (they stick together on colliging) they will
A.come to rest
B.107 dynes
C.move towards right
D.may move in any direction
E.move towards left
Answer» C. move towards right

222.A cannon of weight 10 tonnes fires a shell of 50 kg with a muzzle velocity of 900 m/sec at an angle of 30?. The time taken for the shell to emerge from the barrel is 0.004 sec. The velocity of the cannon would be
A.3.9 m/sec
B.7.8 m/sec
C.8.95 m/sec
D.1.95 m/sec
E.5.85 m/sec
Answer» A. 3.9 m/sec

223.A car is travelling at 90 km/hour on a rough road where the coefficient of friction between the road and the tyre is 0.5. The distance the car will skid before stopping when the brakes are jammed suddenly would be
A.127.4 m
B.95.55 m
C.63.7 m
D.31.85 m
E.90 m
Answer» C. 63.7 m

224.One newton is equal to
A.106 dynes
B.105 dynes
C.104 dynes
D.103 dynes
E.107 dynes
Answer» B. 105 dynes

 226.For perfectly elastic bodies the value of the coefficient of restitution is
 A.0.707
 B.0.5
 C.1
 D.0.25
 E.Zero
 Answer» A. 0.707

227.A satellite launch station should be
A.107 dynes
B.near the equatorial region
C.all the locations are equally good
D.one the polar axis
E.near the polar region
Answer» B. near the equatorial region

228.The direction of projection for the range of a projectile to be maximum on an inclined plane having angle of inclination 30? to the horizontal, whould be
A.45? with horizontal
B.30? with vertical
C.30? with horizontal
D.60? with inclined plane
E.45? with inclined plane
Answer» B. 30? with vertical

229.If for power transmission a gear train consisting of 8 gears is used, then
A.the motion of driver and follower will be in the same direction
B.the motion of driver and follower will be in the opposite directions
C.either of (A) or (B) above
D.None of the above
E.107 dynes
Answer» B. the motion of driver and follower will be in the opposite directions

230.A train travels between two stations 15 km, apart in 18 minutes. If the train accelerates for a part of journey uniformly followed by uniform relardation, the maximum speed attained by the train, during, the journey, will be
A.60 km/hr
B.80 km/hr
C.125 km/hr
D.100 km/hr
E.107 dynes
Answer» D. 100 km/hr

231.The tension T1 will be
A.5 N
B.20 N
C.60 N
D.10 N
E.107 dynes
Answer» D. 10 N

232.A imaginary planet has half the mass and half the radius of the earth. The acceleration of gravity at its surface would be
A.9.8 m/s2
B.107 dynes
C.4.9 m/s2
D.19.6 m/s2
E.2.45 m/s2
Answer» D. 19.6 m/s2

233.The principle of conservation of energy cannot be applied in case of
A.Flow of heat through a metal
B.Ideal flow of water in a pipe
C.Simple pendulum
D.Sliding of a particle along inclined plane with friction
E.A particle moving in gravitational field
Answer» E. A particle moving in gravitational field

234.A truss element
A.107 dynes
B.resists lateral forces
C.is a two-force body
D.is a three force body
E.resist forces in compression only
Answer» C. is a two-force body

235.Impulse can be obtained from
A.force-time diagram
B.velocity-time diagram
C.107 dynes
D.force displacement diagram
E.velocity-displacement diagram
Answer» A. force-time diagram

236.A mass of 5 kg moves on a smooth horizontal plane with a speed of 8 m/s attached to a fixed point on the plane by a string of length 4m. Tension in the string is
A.785
B.80N
C.392.4N
D.None of the above
E.Tapered bearing
Answer» B. 80N

237.The area under stress-strain curve represents
A.Hardness of material
B.Breaking strength of the material
C.Energy required to cause failure
D.Toughness of material
E.Malleabbility of material
Answer» C. Energy required to cause failure

238.A flywheel 200 cm in diameter is rotating at 100 rpm. A point on the rim of the flywheel will not have
A.angular velocity
B.centripental acceleration
C.tangential acceleration
D.all of the above
E.107 dynes
Answer» C. tangential acceleration

239.A block of weight 20 kg slides with an initial velocity of 2 m sec down an inclined plane on to a spring of stiffness 10 kg/cm. If the co–efficient of friction is 0.2, angle ? = 30 the ratio of maximum compession of spring, neglecting friction to that while considering friction would be
A.More than one
B.One
C.Less than one
D.Depends on the stiffness of spring
E.None of the above
Answer» A. More than one

240.A jet engine works on the principle of
A.Conservation of energy
B.Conservation of mass and momentum
C.Conservation of linear mementum
D.Conservation of energy and momentum
E.Conservation of mass
Answer» C. Conservation of linear mementum

241.The angular velocity of seconds hand of a watch is
A.0.01745 sec-1
B.0.00001745 sec-1
C.0.0001745 sec-1
D.0.001745 sec-1
E.0.1047 sec-1
Answer» D. 0.001745 sec-1

242.A uniform cylinder of weight W is rolling while slipping on a rough horizontal surface under the influence of a horizontal force. The force of friction between the cylinder and the surface is
A.Proportional to the coefficient of static friction
B.Proportional to the coefficient of dynamic friction
C.Indeterminate
D.Determinate but depends on the acceleration of the cylinder
E.None of the above
Answer» C. Indeterminate

243.The statement —- if three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two —- is known as
A.Law of polygon of forces
B.D’Alembert’s principle
C.Newtons law of forces
D.Lami’s theorem
E.Law of triangle of forces
Answer» D. Lami’s theorem

244.The dimensions of modulus of elasticity are
A.MLT-2
B.107 dynes
C.MLT-1
D.ML-2T-1
E.ML-1T-2
Answer» E. ML-1T-2

245.A sphere of radius r is cut from larger sphere of radius R. The distance between their centre is a. The centroid of the remaining valoume lies on the line of centres and the sistanc from the centre of the larger sphere is
A.ar2 / (R2 – r2)
B.107 dynes
C.aR/(R2-r2)
D.aR/(R – r)
E.ar3 / (R3 – r3)
Answer» E. ar3 / (R3 – r3)

246.For a perfect frame having 13 members the number of joints must be
A.8
B.6
C.7
D.107 dynes
E.9
Answer» A. 8

247.When a body moves round a fixed axis it will have
A.A motion of rotation and translation
B.A circular motion
C.A rotary motion
D.A translatory motion
E.A swinging motion
Answer» B. A circular motion

248.A ball is dropped from a height of 2.25 m on a smooth floor and it rises to a height of 1 m after the first bounce. The coefficient of restitutions between the ball and the floor is
A.107 dynes
B.0.33
C.0.44
D.0.57
E.0.67
Answer» E. 0.67

249.The work done in sliding a block of weight of 50 kg up a plane inclined at an angle of 30? to the horizontal so that the block is lifted through 1 m
A.More than 50 kgm
B.50 kgm
C.Less than 5 kgm
D.15 kgm only
E.None of the above
Answer» A. More than 50 kgm

 251.Secondary stresses may be set up in frame due to any of the following reasons EXCEPT
 A.members not being straight
 B.self-weight of the members
 C.eccentricity of connections
 D.rigidity of the members
 E.107 dynes
 Answer» D. rigidity of the members

252.Moment of Inertia of triangular section about an axis passing through its base is given by
A.bh3/12
B.bh3/32
C.bh3/36
D.None of the above
E.Tapered bearing
Answer» A. bh3/12

253.Which of the following could be the unit of rotational inertia of a body in CGS system?
A.cm4
B.gm-cm2
C.107 dynes
D.kg-cm2
E.gm-cm4
Answer» B. gm-cm2

254.The angular acceleration of a flywheel decreases uniformly from 8 rad/sec2 to 2 rad sec2 in 6 sec at which time its angular velocity is 42 rad/sec. The initial angular velocity was
A.12 rad/sec
B.24 rad/sec
C.30 rad/sec
D.3 rad/sec
E.6 rad/sec
Answer» A. 12 rad/sec

255.During SHM which of the following is conserved?
A.Kinetic energy
B.Potential energy
C.Total energy
D.Momentum
E.All of the above
Answer» D. Momentum

256.The standard angle between the sides of a V-belt is
A.30?
B.25?
C.40?
D.45?
E.55?
Answer» A. 30?

257.The main advantage of using worm gears is
A.Low power loss
B.High velocity ratio
C.Ease of manufacture
D.Minimum cost
E.All of the above
Answer» C. Ease of manufacture

258.The angle of friction is
A.The angle which frictional force makes with the normal
B.The anle at which the force applied from external souce will cause movement
C.The angle at which fictional force is inclined to external force
D.The angle between the normal reaction and the resultant of normal reaction and the limiting friction
E.None of the above
Answer» D. The angle between the normal reaction and the resultant of normal reaction and the limiting friction

259.In the speed of rotation of earth decreases, the weight of the body will
A.Decrease
B.Remain unaltered
C.Depends on speed ratio
D.Cannot be ascertained on the basis the information given
E.Increase
Answer» C. Depends on speed ratio

260.Which of the following is not a lever of the first order?
A.Pair of Smith’s tongs
B.Wheel barrow
C.Ordinary balance
D.Pair of scissors
E.107 dynes
Answer» B. Wheel barrow

261.A force of 100 Newtons acts for 0.5 seconds on a body of mass 20 kg which is initially at rest. The velocity attained by the body is
A.20 m/s
B.5 m/s
C.2.5 m/s
D.0.5 m/s
E.107 dynes
Answer» C. 2.5 m/s

262.The angle of projection when the range is equal to the distance through which the particle would have fallen in order to acquire a velocity equal to the velocity of projection will be
A.30?
B.45?
C.15?
D.90?
E.22
Answer» C. 15?

263.The motion of a bicycle wheel is
A.Curvilinear
B.Translatory
C.Linear
D.Rotary as well as translatory
E.Rotary
Answer» D. Rotary as well as translatory

264.A particle in simple Harmonic Motion while passing through mean position will have
A.Maximum kinetic energy and minimum potential energy
B.Average kinetic energy and average potential energy
C.Minimum kinetic energy and maximum potential energy
D.Maximum kinetic energy and maximum
E.Minimum kinetic energy and minimum potential energy
Answer» A. Maximum kinetic energy and minimum potential energy

265.A bullet is fired from a fifle. If the rifle recoils freely, the kinetic energy of the rifle
A.will be the same as the kinetic energy of the bullet
B.will be less than the kinetic energy of the bullet
C.107 dynes
E.will be more than the kinetic energy of the bullet
Answer» B. will be less than the kinetic energy of the bullet

266.The locus of a point on a thread unwound from a cylinder will be
A.A circle
B.A cycloid
C.A straight line
D.A spiral
E.An involute
Answer» B. A cycloid

267.The moment of inertia of a thin spherical shell is
A.Mr2
B.1/2 Mr2
C.1/3 Mr2
D.2/3 Mr2
E.None of the above
Answer» D. 2/3 Mr2

268.A train travels between two stations 15 km apart in 18 minutes. If the train accelerates for a part of journey uniformly followed by uniform retardation, the maximum speed attained by the train during the journey will by
A.125 km/hr
B.107 dynes
C.80 km/hr
D.100 km/hr
E.60 km/hr
Answer» D. 100 km/hr

269.A man is standing ner the edge of a uniformly rotating platform about an axis passing through its centre. The speed of rotation of the platorm will decrease if he
A.extends his arms outwards
B.107 dynes
C.moves towards the axis of rotation
D.jumps out from that platform
E.take out his coat and throws away
Answer» A. extends his arms outwards

270.A apinning ballet dancer draws her arms close to her chest. She will now
A.107 dynes
B.spin at the same rate
C.spin faster
D.spin slower
E.stop spinning
Answer» D. spin slower

271.The moment of inertia of a solid sphere of radius r is
A.Mr2
B.1/8 Mr2
C.2/3 Mr2
D.m4
E.1/2 Mr2
Answer» A. Mr2

272.A stone of wight 100 kg is thrown vertically upwards by a man of height y = 1.8 m with an initial velocity of 20 m/sec. The maximum height to which it will rise would be
A.22.2 m
B.26 m
C.15.1 m
D.20.2 m
E.10 m
Answer» A. 22.2 m

273.The breaking strength of a rope is 400 N. A fireman weighing 60 kg slides down the rope. The rope will break if
A.107 dynes
B.the acceleration is 7.5 m/s2
C.the acceleration is 1.2 m/s2
D.the acceleration is 3.1 m/s2
E.the slides with an acceleration of 15 m/s2
Answer» C. the acceleration is 1.2 m/s2

274.In case of a beam subjected to pure bending
A.107 dynes
B.the stress intensity in any fibre is proportional to the distance of the fibre from the neutral axis
C.the stress intensity in any fibre is proportional to the distance of the fibre from the load carrying end
D.the stress intensity in any fibre is uniform
E.the nature of stress in any fibre is identical
Answer» B. the stress intensity in any fibre is proportional to the distance of the fibre from the neutral axis

 276.The ratio of moment of inertia of a circular body about x axis to that about y axis is
 A.?
 B.?
 D.1?4
 E.1
 Answer» E. 1

277.A compressure force in boom in above problem is
A.107 dynes
B.1096 kg
C.886 kg
D.693 kg
E.1390 kg
Answer» E. 1390 kg

278.A body having SHM has period of 6 sec and amplitude of 4 mts. Maximum velocity is
A.?/3 m/s
B.2?/3 m/s
C.107 dynes
D.3? m/s
E.4?/3 m/s
Answer» E. 4?/3 m/s

279.What is the maximum force, in Newtons, that will not cause tension?
A.294
B.316
C.346
D.184
E.107 dynes
Answer» A. 294

280.Centroid of the are of circle shown in adjacement figure is
A.r sin (?/2)/2 ?, 0
B.r sin (?)/?, 0
C.2 r sin (?/2)/?, 0
D.107 dynes
E.2r sin (?)/?, 0
Answer» C. 2 r sin (?/2)/?, 0

281.The centroid of the area between the circle x2 + y2 = 16 and the line x + y = 4 will have the coordinates
A.(4, 2)
B.(2, 4)
C.(2.34, 2.34)
D.(1.16, 1.16)
E.None of the above
Answer» C. (2.34, 2.34)

282.Polar moment of inertia is
A.Applicable to masses whereas moment of inertia is applicable to area only
B.The moment of inertia for an area ralative to a line or axis which is out the plane of area
C.Same as moment of inertia
D.The moment of inertia for an area relative to a line or axis parallel to the centroidal axis
E.The moment of inertia for an area relative to a line or axis perpendicular to the plane of the area
Answer» E. The moment of inertia for an area relative to a line or axis perpendicular to the plane of the area

283.A bullet is fired vertically upwards with a velocity of 2200 ft/s. Bullet ascends to a height of
A.56,900 ft
B.107 dynes
C.75,000 ft
D.48.300 ft
E.65,800 ft
Answer» C. 75,000 ft

284.In the impact problems the following conditions must always be satisfied
A.The total kinetic energy remains unchanged
B.The total linear momentum remains unchanged
C.The magnitude of the total linear momentum is multiplied by the coefficient of restitution
D.The kinetic energy of the system is reduced by a factor proportional to the coefficient of restitution
E.None of the above
Answer» B. The total linear momentum remains unchanged

285.A hammer gains 50 Ns momentum in 0.05 sec. The average force on the hammer will be
A.500 N
B.2000 N
C.1500 N
D.107 dynes
E.1000 N
Answer» E. 1000 N

286.If the distance to electric train is given by Fr = a + bv + cv2 In this equation constant c is likely to cover
A.air resistance
B.track resistance
C.frictional resistance
D.flange resistance
E.107 dynes
Answer» A. air resistance

287.A man is standing near the edge of a uniformly rotating platform about an axis passing through its centre. The speed of rotation of the platform will decrease if he
A.extends his arms outwards
B.moves towards the axis of rotation
C.jumps out from the platform
D.accepts a heavy bag from one of his friends standing near by and holds it in his hand
E.107 dynes
Answer» D. accepts a heavy bag from one of his friends standing near by and holds it in his hand

288.A stone weighing 20 N is whirling in a vertical circle at the extremity of a string 100 cm long. The tension in the string will be zero
A.at the highest position
B.at the lowest position
C.at the midway position
D.at none of the above
E.107 dynes
Answer» A. at the highest position

289.During planetary motion which of the following remains constant?
A.Augular speed
B.Linear velocity
C.Angular acceleration
D.Total angular momentum
E.All of the above
Answer» B. Linear velocity

290.According to principle of transmissiblity of forces, when a force acts upon a body, its effect is
A.maximum when it acts at C.G. of the body
B.minimum when it acts at C.G. of the body
C.different at different points of the body
D.107 dynes
E.same at every point in its line of action
Answer» E. same at every point in its line of action

291.The statement — if forces acting on a point can be represented in magnitude and direction by the sides of a polygon taken in order then their resultant will be represented in magnitude and direction by the closing side of the polygon taken in opposite order —- is known as
A.Law of triangle of forces
B.Newton’s law of forces
C.Law of polygon of forces
D.D’Alembert’s rule
E.Lami’s theorem
Answer» C. Law of polygon of forces

292.A ball A of mass 0.25 kg moving on a smooth horizontal table with a velocity of 10 m/s strikes an identical stationary ball B on the table. If the impact is perfectly elastic, the velocity of the ball B just after the impact will be
A.2.5 m/s
B.zero
C.5 m/s
D.10 m/s
E.107 dynes
Answer» C. 5 m/s

293.The slope on the road generally provided on the curves is known as
A.Angle of repose
B.Angle of friction
C.Angle of banking
D.Angle of reaction
E.None of the above
Answer» C. Angle of banking

294.An automobile weighing 2800 lb and travelling at 30 miles/hr, hits a depression in the road which has a radius of curvature of 50 ft. What is the total force to which springs are subjected.
A.8230 lb
B.6170 lb
C.2800 ib
D.107 dynes
E.3280 lb
Answer» B. 6170 lb

295.A block A is dropped down a smooth inclined plane, while another identical block B is released for free fall from the same height
A.block A will have higher velocity than block B while hitting the ground
B.block B will hit the ground earlier.
C.both will hit the ground simultaneously
D.block A will hit the ground earlier
E.107 dynes
Answer» B. block B will hit the ground earlier.

296.A projectile is shot straight up with vo = 40 m/s. After how many seconds will it return if drag is neglected?
A.6
B.107 dynes
C.4
D.10
E.8
Answer» E. 8

297.The necessary condition for the forces acting on a body to be in equilibrium is that these should be
A.In the same direction
B.Coplaner
C.Similar in nature
D.Should not meet at a point
E.(B) and (D) above
Answer» E. (B) and (D) above

298.A rocket is fired vertically from the ground with a resultant vertical acceleration of 10 m/sec the fuel is finished in one minute and it continues to move up. The maximum height reached will be
A.2 km
B.20 km
C.36 km
D.10 km
E.80 km
Answer» A. 2 km

299.What force is necessary to hold a weight of 100 kg suspended on a rope wrapped 3 times around a post
A.0.35
B.0.8
C.1.46
D.2.85
E.107 dynes
Answer» A. 0.35

 301.The weight of an object will be maximum when it is placed at
 A.North pole
 B.South pole
 C.Equator
 D.Centre of earth
 E.Any of the above loctions
 Answer» D. Centre of earth

302.A grinding wheel rotates at 3000 rpm. When power supply is cut off the wheel stops in 5 sec. The number of revolutions made by the wheel before coming to rest would be
A.500
B.107 dynes
C.250
D.3000
E.1000
Answer» C. 250

303.A solid spherical ball rolls on a table. The momen’ of inertia of the ball is given by 3/5 x mass x radius2. The ratio of translational and rotational kinetic energies for ball will be
A.2
B.7?16
C.5?3
D.7?8
E.1
Answer» C. 5?3

304.A particle inside a hollow sphere of internal radius r with coefficient of friction 1/?3 can rest upto height of
A.0.18 r
B.0.435 r
C.0.25 r
D.0.134 r
E.0.125 r
Answer» D. 0.134 r

305.A particle starts from rest and moves in a straight line whose equation of motion is given by S = 2t3 – t2 – 1. The acceleration of the particle after one sec will be
A.6 m/sec2
B.4 m/sec2
C.12 m/sec2
D.10 m/sec2
E.8 m/sec2
Answer» D. 10 m/sec2

306.An electric motor drives a windless which hauls up a crate A of weight W = 500 kg up an inclined plane through a height of 10 m in 2 minutes. The torque acting on the windless is 25 kgm and the drum of the windless makes 30 rpm. The efficiency of the inclined plane would be
A.41%
B.61%
C.26.50%
D.53.05%
E.66%
Answer» D. 53.05%

307.A screw jack has 4 threads per inch. The mean radius of the thread is 2.338 inches. The mean diameter of the bearing surface under the cap is 3.25 inches. What is the turning moment required to raise the bload of 150 kg
A.5.61 kg-inch
B.50.6 kg-inch
C.107 dynes
D.30.3 kg-inch
E.23.6 kg-inch
Answer» B. 50.6 kg-inch

308.The length of Seconds Pendulum is
A.992 mm
B.999 mm
C.994 mm
D.995 mm
E.1000 mm
Answer» C. 994 mm

309.The law of conservation of mechanical energy is valid
A.Irrespective of the nature of force field
B.Only in gravitational field
C.Only if the total work done by the particle in moving around in a closed trajectory is zero
D.Only if the force is tangential to the trajectory
E.None of the above
Answer» C. Only if the total work done by the particle in moving around in a closed trajectory is zero

310.In above case the maximum height attained by the ball would be
A.49 cm
B.490 cm
C.980 cm
D.1960 cm
E.100 cm
Answer» B. 490 cm

311.The units of moment of inertia are
A.kgm4
B.kg-m2
C.kg/m2
D.kg/m
E.m4
Answer» C. kg/m2

Tags

Question and answers in Applied Mechanics,Applied Mechanics multiple choice questions and answers,Applied Mechanics Important MCQs,Solved MCQs for Applied Mechanics,Applied Mechanics MCQs with answers PDF download

Previous article

You must login to add a comment.

Need An Account,