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This set of Applied Mechanics Multiple Choice Questions & Answers (MCQs) focuses on Applied Mechanics Set 3
Q1 | 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
- 10.9 rad/sec
- 19.0 rad/sec
- 51.2 rad/sec
- 3.33 rad/sec
- 16.35 rad/sec
Q2 | 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
- 1 lunar month
- 2-3/4 lunar month
- 2-2/3 lunar month
- None of the above
Q3 | 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
- the force applied on A must be equal to that on B
- at least one man on side B should be removed
- infinite force will be required to be applied at both ends
- the force required on A must not be equal to that on B
- 107 dynes
Q4 | For the maximum range of a projectile the angle of projection should be
- 90?
- 30?
- 22
- 45?
- 15?
Q5 | In a torsion pendulum
- The body attached to the lower end of wire or rod must be elastic
- The clamp must be elastic
- The clamp must be elastic
- (A) and (B) above
- (A), (B) and (C) together
Q6 | 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
- 75?
- 60?
- 22
- 30?
- 45?
Q7 | 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 and B
- C
- B
- 107 dynes
Q8 | A column has its equivalent length equal to its length in case of
- one end fixed, other free
- both ends hinged
- one end hinged, other free
- 107 dynes
- both end fixed
Q9 | A particle in SHM while passing through mean position will have
- maximum kinetic energy and maximum potential energy
- 107 dynes
- maximum kinetic energy and minimum potential energy
- average kinetic energy and average potential energy.
- minimum kinetic energy and maximum potential energy
Q10 | 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
- 15 - 20 kg
- 20 - 25 kg
- 5 - 10 kg
- 25 - 30 kg
- 10 - 15 kg
Q11 | A flywheel starting from rest and accelerating uniformly performs 25 revolutions in 5 sec. Its angular velocity in rpm after 10 seconds would be
- 50 rpm
- 20 rpm
- 25 rpm
- 60 rpm
- 45 rpm
Q12 | The dimensions of gravitational constant G
- MLT-2
- M-1L3T-2
- Ellipsc
- ML2T-1
- MLT-1
Q13 | The coefficient of friction is
- The tangent of the angle between the normal reaction and direction of limiting friction
- The tangent of the angle between the normal reaction and the resultant of the normal reaction and the limiting friction
- The tangent of the angle of the net resultant force with the direction of motion
- The tangent of the angle between the horizontal plane and the resultant force
- The angle between the normal reaction and the resultant of normal reaction and the limiting friction
Q14 | The maximum frictional force which comes into play when a body just begins to slide over the surface of another body is known as
- Kinetic friction
- Rolling friction
- Dynamic friction
- Limiting friction
- Sliding friction
Q15 | In planetary motion
- The total angular momentum remains constant
- The total linear momentum remains constant
- The total linear momentum is zero
- The total angular momentum is zero
- None of the above
Q16 | The moment of inertia of a semi-circle of radius r with respect to a centroidal axis parallel to the diameter is
- 0.33 r2
- 0.11 r2
- 0.055 r2
- 0.05 r2
- 0.22 r2
Q17 | 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
- 7200
- 6600
- 7800
- 6000
- 107 dynes
Q18 | The curve of a catenary by nature is
- hyperbolic
- ellipse
- 107 dynes
- circular
- parabolic
Q19 | 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
- 103 kmph
- 83 kmph
- 107 dynes
- 43 kmph
- 63 kmph
Q20 | If for power transmission a gear train consisting of 11 gears is used, then
- the motion of driver and follower will be in the same direction
- The motion of driver and follower will be in the opposite direction
- either of (A) or (B) above
- None of the above
- 107 dynes
Q21 | A body weighing one tonne falls through 8 cm on to a spring of stiffness 500 kg/cm the spring will be compressed through
- 8 cm
- 6 cm
- 4 cm
- 10 cm
- 12 cm
Q22 | 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.
- 68.9 mts/sec2
- 102.6 mts/sec2
- 78.94 mts/sec2
- 107 dynes
- 33.2 mts/sec2
Q23 | Two identical weights are dropped simultaneously, one on water and the other in glycerine. Which of the following statement is correct?
- The weight will settle slowly in water but quickly in glycerine
- The weights will take same time to settle
- The water level will fall but glycerine level will rise
- The weight will settle quickly in water but slowly in glycerine
- 107 dynes
Q24 | A wound watch spring possesses energy in the form of
- Mechanical potential energy
- Kinetic energy
- Spring energy
- Potential energy
- Both potential and kinetic energy
Q25 | The earth's gravitational force field is said to be conservative force field because
- The work acted by the earth's gravitational field on a particle is independent on the path traced out by the particle
- The work acted by the erth's gravitational field will cause same path for all particles irrespective of their mass
- The direction of gravitational force is fixed
- The gravitational field has only single directional component always acting normal to a body
- The value of gravitational force rise is fixed