Engineering Mechanics MCQs

Question 1

The unit of angular velocity is

Accepted Answer

Both (B) and (C)

Answer

M/min

Answer

Rad/s

Answer

Revolutions/min

Question 2

The unit of force in S.I. units is

Accepted Answer

Newton

Answer

Kilogram

Answer

Watt

Answer

Dyne

Question 3

The unit of work in S.I. units is

Accepted Answer

Joule

Answer

Newton

Answer

Erg

Answer

Kg-m

Question 4

The weight of a body is due to

Accepted Answer

Gravitational force of attraction towards the centre of the earth

Answer

Gravitational pull exerted by the earth

Answer

Forces experienced by body in atmosphere

Answer

Force of attraction experienced by particles

Question 5

The wheels of a moving car possess

Accepted Answer

Kinetic energy of translation and rotation both

Answer

Potential energy only

Answer

Kinetic energy of translation only

Answer

Kinetic energy of rotation only

Question 6

The below figure shows the three coplanar forces P, Q and R acting at a point O. If these forces are in equilibrium, then

Accepted Answer

$$\frac{{	ext{P}}}{{\sin \alpha }} = \frac{{	ext{Q}}}{{\sin \beta }} = \frac{{	ext{R}}}{{\sin \gamma }}$$

Answer

$$\frac{{	ext{P}}}{{\sin \beta }} = \frac{{	ext{Q}}}{{\sin \alpha }} = \frac{{	ext{R}}}{{\sin \gamma }}$$

Answer

$$\frac{{	ext{P}}}{{\sin \gamma }} = \frac{{	ext{Q}}}{{\sin \alpha }} = \frac{{	ext{R}}}{{\sin \beta }}$$

Answer

$$\frac{{	ext{P}}}{{\sin \alpha }} = \frac{{	ext{Q}}}{{\sin \gamma }} = \frac{{	ext{R}}}{{\sin \beta }}$$

Question 7

If a number of coplanar forces acting at a point be in equilibrium, the sum of clockwise moments must be __________ the sum of anticlockwise moments, about any point.

Accepted Answer

Equal to

Answer

Less than

Answer

Greater than

Answer

None of these

Question 8

A body of weight 'W' is required to move up on rough inclined plane whose angle of inclination with the horizontal is 'α'. The effort applied parallel to the plane is given by (where μ = tanφ = Coefficient of friction between the plane and the body.)

Accepted Answer

P = W (sinα + μcosα)

Answer

P = W tanα

Answer

P = W tan (α + φ)

Answer

P = W (cosα + μsinα)

Question 9

The law of motion involved in the recoil of gun is

Accepted Answer

Newton's third law of motion

Answer

Newton's first law of motion

Answer

Newton's second law of motion

Answer

None of these