Engineering Mechanics MCQs

Question 1

The force required to move the body up the plane will be minimum if it makes an angle with the inclined plane __________ the angle of friction.

Accepted Answer

Equal to

Answer

Less than

Answer

Greater than

Answer

None of these

Question 2

Angle of friction is the

Accepted Answer

Angle between normal reaction and the resultant of normal reaction and the limiting friction

Answer

Ratio of limiting friction and normal reaction

Answer

The ratio of minimum friction force to the friction force acting when the body is just about to move

Answer

The ratio of minimum friction force to friction force acting when the body is in motion

Question 3

If tension in the cable supporting a lift moving downwards is half the tension when it is moving upwards, the acceleration of the lift is

Accepted Answer

None of these

Answer

$$\frac{{	ext{g}}}{2}$$

Answer

$$\frac{{	ext{g}}}{3}$$

Answer

$$\frac{{	ext{g}}}{4}$$

Question 4

A particle moves along a straight line such that distance (x) traversed in 't' seconds is given by x = t2 (t - 4), the acceleration of the particle will be given by the equation

Accepted Answer

6f - 8

Answer

6t2 - 8t

Answer

3t2 + 2t

Answer

6f - 4

Question 5

When two elastic bodies collide with each other,

Accepted Answer

All of the above

Answer

The two bodies will momentarily come to rest after collision

Answer

The two bodies tend to compress and deform at the surface of contact

Answer

The two bodies begin to regain their original shape

Question 6

A number of forces acting at a point will be in equilibrium, if

Accepted Answer

Sum of resolved parts in the vertical direction is zero (i.e. ∑V = 0)

Answer

All the forces are equally inclined

Answer

Sum of all the forces is zero

Answer

None of these

Question 7

The moment of inertia of a square of side (a) about an axis through its center of gravity is

Accepted Answer

$$\frac{{{{	ext{a}}^4}}}{{12}}$$

Answer

$$\frac{{{{	ext{a}}^4}}}{4}$$

Answer

$$\frac{{{{	ext{a}}^4}}}{8}$$

Answer

$$\frac{{{{	ext{a}}^4}}}{{36}}$$

Question 8

The below figure shows the two equal forces at right angles acting at a point. The value of force ‘R’ acting along their bisector and in opposite direction is

Accepted Answer

$$\sqrt 2 \,{	ext{P}}$$

Answer

$$\frac{{	ext{P}}}{2}$$

Answer

2P

Answer

$$\frac{{	ext{P}}}{{\sqrt 2 }}$$

Question 9

The maximum mechanical advantage of a lifting machine is

Accepted Answer

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

Answer

1 + m

Answer

1 - m

Answer

m