Applied Mechanics MCQ

1. A bullet weighing 200 g is fired horizontally with a velocity of 25 m/sec from a gun carried on a carriage which together with the gun weighs 100 kg. The velocity of recoil of the gun, will be

• 0.01 m/sec
• 0.05 m/sec
• 1.00 m/sec
• 1.5 m/see

2. On a ladder resisting on a smooth ground and leaning against a rough vertical wall, the force of friction acts

• Towards the wall at its upper end
• Away from the wall at its upper end
• Upwards at its upper end
• Downwards at its upper end

3. A load of 500 kg was lifted through a distance of 13 cm. by an effort of 25 kg which moved through a distance of 650 cm. The efficiency of the lifting machine is

• 50%
• 40%
• 55%
• 30%.

4. A square hole is punched out of a circular lamina, the diagonal of the square being the radius of the circle. If r is the radius of the circle, the C.G. of the remainder from the corner of the square on the circumference will be

5. One Joule is equivalent to

• 9.81 Newton metre
• 1 Newton metre
• 1 kg wt metre
• 1 dyne metre

6. One Newton is equivalent to

• 1 kg. wt
• 9.81 kg. wt
• 981 dyne
• 1/9.81 kg. wt

7. The tension in a cable supporting a lift

• is more when the lift is moving downwards
• is less when the lift is moving upwards
• remains constant whether its moves downwards or upwards
• is less when the lift is moving downwards.

8. Work may be defined as

• force x distance
• force x velocity
• force x acceleration
• none of these.

9. The force polygon representing a set of forces in equilibrium is a

• Triangle
• Open polygon
• Closed polygon
• Parallelogram

10. The motion of a bicycle wheel is

• Translatory
• Rotary
• Rotary and translatory
• Curvilinear

11. Effect of a force on a body depends upon its

• Direction
• Magnitude
• Position
• All the above