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This set of Applied Mechanics Multiple Choice Questions & Answers (MCQs) focuses on Applied Mechanics Set 11
Q1 | Secondary stresses may be set up in frame due to any of the following reasons EXCEPT
- members not being straight
- self-weight of the members
- eccentricity of connections
- rigidity of the members
- 107 dynes
Q2 | Moment of Inertia of triangular section about an axis passing through its base is given by
- bh3/12
- bh3/32
- bh3/36
- None of the above
- Tapered bearing
Q3 | Which of the following could be the unit of rotational inertia of a body in CGS system?
- cm4
- gm-cm2
- 107 dynes
- kg-cm2
- gm-cm4
Q4 | 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
- 12 rad/sec
- 24 rad/sec
- 30 rad/sec
- 3 rad/sec
- 6 rad/sec
Q5 | During SHM which of the following is conserved?
- Kinetic energy
- Potential energy
- Total energy
- Momentum
- All of the above
Q6 | The standard angle between the sides of a V-belt is
- 30?
- 25?
- 40?
- 45?
- 55?
Q7 | The main advantage of using worm gears is
- Low power loss
- High velocity ratio
- Ease of manufacture
- Minimum cost
- All of the above
Q8 | The angle of friction is
- The angle which frictional force makes with the normal
- The anle at which the force applied from external souce will cause movement
- The angle at which fictional force is inclined to external force
- The angle between the normal reaction and the resultant of normal reaction and the limiting friction
- None of the above
Q9 | In the speed of rotation of earth decreases, the weight of the body will
- Decrease
- Remain unaltered
- Depends on speed ratio
- Cannot be ascertained on the basis the information given
- Increase
Q10 | Which of the following is not a lever of the first order?
- Pair of Smith's tongs
- Wheel barrow
- Ordinary balance
- Pair of scissors
- 107 dynes
Q11 | 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
- 20 m/s
- 5 m/s
- 2.5 m/s
- 0.5 m/s
- 107 dynes
Q12 | 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
- 30?
- 45?
- 15?
- 90?
- 22
Q13 | The motion of a bicycle wheel is
- Curvilinear
- Translatory
- Linear
- Rotary as well as translatory
- Rotary
Q14 | A particle in simple Harmonic Motion while passing through mean position will have
- Maximum kinetic energy and minimum potential energy
- Average kinetic energy and average potential energy
- Minimum kinetic energy and maximum potential energy
- Maximum kinetic energy and maximum
- Minimum kinetic energy and minimum potential energy
Q15 | A bullet is fired from a fifle. If the rifle recoils freely, the kinetic energy of the rifle
- will be the same as the kinetic energy of the bullet
- will be less than the kinetic energy of the bullet
- 107 dynes
- will be more than the kinetic energy of the bullet
Q16 | The locus of a point on a thread unwound from a cylinder will be
- A circle
- A cycloid
- A straight line
- A spiral
- An involute
Q17 | The moment of inertia of a thin spherical shell is
- Mr2
- 1/2 Mr2
- 1/3 Mr2
- 2/3 Mr2
- None of the above
Q18 | 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
- 125 km/hr
- 107 dynes
- 80 km/hr
- 100 km/hr
- 60 km/hr
Q19 | 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
- extends his arms outwards
- 107 dynes
- moves towards the axis of rotation
- jumps out from that platform
- take out his coat and throws away
Q20 | A apinning ballet dancer draws her arms close to her chest. She will now
- 107 dynes
- spin at the same rate
- spin faster
- spin slower
- stop spinning
Q21 | The moment of inertia of a solid sphere of radius r is
- Mr2
- 1/8 Mr2
- 2/3 Mr2
- m4
- 1/2 Mr2
Q22 | 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
- 22.2 m
- 26 m
- 15.1 m
- 20.2 m
- 10 m
Q23 | The breaking strength of a rope is 400 N. A fireman weighing 60 kg slides down the rope. The rope will break if
- 107 dynes
- the acceleration is 7.5 m/s2
- the acceleration is 1.2 m/s2
- the acceleration is 3.1 m/s2
- the slides with an acceleration of 15 m/s2
Q24 | In case of a beam subjected to pure bending
- 107 dynes
- the stress intensity in any fibre is proportional to the distance of the fibre from the neutral axis
- the stress intensity in any fibre is proportional to the distance of the fibre from the load carrying end
- the stress intensity in any fibre is uniform
- the nature of stress in any fibre is identical
Q25 | A non-reversible machine has efficiency
- less than 50%
- nearly 100%
- between 75% and 99%
- more than 50%
- 107 dynes