Engineering Mechanics MCQs

Question 1

The necessary condition for forces to be in equilibrium is that these should be

Accepted Answer

Both (A) and (B) above

Answer

Coplanar

Answer

Meet at one point

Answer

All be equal

Question 2

The acceleration of a particle moving with simple harmonic motion is __________ at the mean position.

Accepted Answer

Zero

Answer

Minimum

Answer

Maximum

Answer

None of these

Question 3

The motion of a particle round a fixed axis is

Accepted Answer

Circular

Answer

Translatory

Answer

Rotary

Answer

Translatory as well as rotary

Question 4

If the resultant of two equal forces has the same magnitude as either of the forces, then the angle between the two forces is

Accepted Answer

120°

Answer

30°

Answer

60°

Answer

90°

Question 5

Moment of inertia of a hollow rectangular section as shown in the below figure about X-X axis, is

Accepted Answer

$$\frac{{{	ext{B}}{{	ext{D}}^3}}}{{12}} - \frac{{{	ext{b}}{{	ext{d}}^3}}}{{12}}$$

Answer

$$\frac{{{	ext{D}}{{	ext{B}}^3}}}{{12}} - \frac{{{	ext{d}}{{	ext{b}}^3}}}{{12}}$$

Answer

$$\frac{{{	ext{B}}{{	ext{D}}^3}}}{{36}} - \frac{{{	ext{b}}{{	ext{d}}^3}}}{{36}}$$

Answer

$$\frac{{{	ext{D}}{{	ext{B}}^3}}}{{36}} - \frac{{{	ext{d}}{{	ext{b}}^3}}}{{36}}$$

Question 6

If a rigid body is in equilibrium under the action of three forces, then

Accepted Answer

Both (B) and (C) above

Answer

These forces are equal

Answer

The lines of action of these forces meet in a point

Answer

The lines of action of these forces are parallel

Question 7

If a number of forces act simultaneously on a particle, it is possible

Accepted Answer

To replace them by a single force

Answer

Not a replace them by a single force

Answer

To replace them by a single force through C.G.

Answer

To replace them by a couple

Question 8

A rubber ball is dropped from a height of 2 m. If there is no loss of velocity after rebounding, the ball will rise to a height of

Accepted Answer

2 m

Answer

1 m

Answer

3 m

Answer

4 m

Question 9

The centre of percussion of the homogeneous rod of length ‘L’ suspended at the top will be

Accepted Answer

$$\frac{{2{	ext{L}}}}{3}$$

Answer

$$\frac{{	ext{L}}}{2}$$

Answer

$$\frac{{	ext{L}}}{3}$$

Answer

$$\frac{{3{	ext{L}}}}{4}$$