Engineering Mechanics MCQs

Question 1

The moment of inertia of a thin rod of mass 'm' and length '$$l$$', about an axis through its centre of gravity and perpendicular to its length is

Accepted Answer

$$\frac{{{	ext{m}}{l^2}}}{{12}}$$

Answer

$$\frac{{{	ext{m}}{l^2}}}{4}$$

Answer

$$\frac{{{	ext{m}}{l^2}}}{6}$$

Answer

$$\frac{{{	ext{m}}{l^2}}}{8}$$

Question 2

The center of gravity of a triangle lies at the point of

Accepted Answer

Concurrence of the medians

Answer

Intersection of its altitudes

Answer

Intersection of bisector of angles

Answer

Intersection of diagonals

Question 3

The maximum efficiency of a lifting machine is

Accepted Answer

$$\frac{1}{{{	ext{mVR}}}}$$

Answer

$$\frac{1}{{	ext{m}}}$$

Answer

$$\frac{{{	ext{VR}}}}{{	ext{m}}}$$

Answer

$$\frac{{	ext{m}}}{{{	ext{VR}}}}$$

Question 4

The maximum frictional force, which comes into play, when a body just begins to slide over the surface of the other body, is known as

Accepted Answer

Limiting friction

Answer

Static friction

Answer

Dynamic friction

Answer

Coefficient of friction

Question 5

The resultant of two forces P and Q (such that P > Q) acting along the same straight line, but in opposite direction, is given by

Accepted Answer

P - Q

Answer

P + Q

Answer

$$\frac{{	ext{P}}}{{	ext{Q}}}$$

Answer

$$\frac{{	ext{Q}}}{{	ext{P}}}$$

Question 6

In ideal machines, mechanical advantage is __________ velocity ratio.

Accepted Answer

Equal to

Answer

Less than

Answer

Greater than

Answer

None of these

Question 7

Tension in the cable supporting a lift is more when the lift is moving __________ with an acceleration.

Accepted Answer

Upwards

Answer

Downwards

Answer

Horizontal

Answer

None of these

Question 8

The amplitude is always __________ radius of the circle.

Accepted Answer

Equal to

Answer

Less than

Answer

Greater than

Answer

None of these

Question 9

The bodies which rebound after impact are called

Accepted Answer

Elastic bodies

Answer

Inelastic bodies

Answer

Neither elastic nor inelastic bodies

Answer

None of these