# Engineering Mechanics – Section 2

1. The point, through which the whole weight of the body acts, irrespective of its position, is known as

A. moment of inertia
B. center of gravity
C. center of percussion
D. center of mass

Correct Answer: B. center of gravity

2. The loss of kinetic energy during the elastic impact is zero.

A. Agree
B. Disagree

3. The overturning of a vehicle on a level circular path can be avoided if the velocity of the vehicle is __________ A. less than
B. greater than

4. Which of the following is a scalar quantity?

A. Force
B. Speed
C. Velocity
D. Acceleration

5. The rate of change of momentum is directly proportional to the impressed force and takes place in the same direction in which the force acts. This statement is known as

A. Newton’s first law of motion
B. Newton’s second law of motion
C. Newton’s third law of motion
D. none of these

Correct Answer: B. Newton’s second law of motion

6. In ideal machines, mechanical advantage is __________ velocity ratio.

A. equal to
B. less than
C. greater than

7. The minimum force required to slide a body of weight W on a rough horizontal plane is

A. W sin θ
B. W cos θ
C. W tan θ
D. none of these

Correct Answer: C. W tan θ

8. The moment of inertia of a square of side a about its diagonal is

A. a2/8
B. a3/12
C. a4/12
D. a4/16

9. The angular velocity (in rad / s) of a body rotating at N revolutions per minute is

A. πN/60
B. πN/180
C. 2πN/60
D. 2πN/180