Engineering Mechanics MCQs

Question 1

If two bodies, one light and other heavy, have equal kinetic energy, which one has a greater momentum

Accepted Answer

The heavy body

Answer

The light body

Answer

Both have equal momentum

Answer

Unpredictable

Question 2

The sum of kinetic and potential energy of a falling body

Accepted Answer

Is constant at all points

Answer

Varies from point to point

Answer

Is maximum at staring and goes on increasing

Answer

Is maximum at starting and then goes on decreasing

Question 3

A 100 kg weight falls 10 cm on a 10 kg/cm spring, The spring will deflect by

Accepted Answer

5 cm

Answer

10 cm

Answer

20 cm

Answer

2.5 cm

Question 4

Two railway wagons of masses 12 and 10 tonnes moving in the same direction at speeds 3 metres per second and 5 metres per second respectively collide and then move together. Their common speed is given by

Accepted Answer

3.91 m/sec

Answer

2.75 m/sec

Answer

2.2 m/sec

Answer

4.5 m/sec

Question 5

The period of oscillation of a simple pendulum depends on

Accepted Answer

Its effective length

Answer

Mass of bob

Answer

Radius of bob

Answer

Density of bob

Question 6

A body is vibrating at 10 vibrations/sec in SHM of 10 cm amplitude. The maximum velocity in cm/sec can be

Accepted Answer

200π

Answer

100π

Answer

50π

Answer

100

Question 7

Three perfectly elastic and similar balls are lying on floor. When one is struck with velocity v, it strikes second and onwards third. What will be their resultant velocity at end

Accepted Answer

v/3

Answer

v

Answer

v/2

Answer

v/4

Question 8

In order to double the period of simple pendulum

Accepted Answer

Its length should be quadrupled

Answer

The mass of its bob should be doubled

Answer

The mass of its bob should be quadrupled

Answer

Its length should be doubled

Question 9

The period of vibration of a pendulum is least at sea level where the latitude is

Accepted Answer

90°

Answer

30°

Answer

45°

Answer

60°