# Mechanics MCQs

## Mechanics MCQs

1. Extension per unit length is equal to _________.

A. Tensile stress
B. Tensile strain
C. Both A and B
D. None of these

B

2. Force per unit area is equal to _____.

A. Force
B. Momentum
C. Torque
D. None of these

A

3. The (vector) force per unit volume is equal ______.

A. Mass
B. Momentum
C.Presure
D.None of these

C

4. Which axial force is determined while analyzing a truss?

A. Compressive force
B. Tensile force
C. Both a. and b.
D. None of these

C

5. Both of the momentum and total kinetic energy are conserved in ___________.

A. Truss
B.Elastic Collision
C. Both A and B
D.None of these

B

6. Energy above that needed to ionize the molecule is carried away as kinetic energy of the electron ejected.

A. Heat energy
B. Thermal Energy
C. Kinetic Energy
D. None of these

C

7. Body is subjected to plastic impact, _______.

A. Only kinetic energy is conserved
B. Only momentum is conserved
C. Both A and B
D. None of these

B

8. The total angular momentum of a body is given by

A. I × ω; where I: a moment of inertia of the body, ω: angular velocity
B. I² × ω; where I: a moment of inertia of the body, ω: angular velocity
C. I² × ω²; where I: a moment of inertia of the body, ω: angular velocity
D. I × ω²; where I: a moment of inertia of the body, ω: angular velocity

A

9. The total momentum of a system __________, if no external impressed force acts on it.

A. Increases
B. Decreases
C. Remains constant
D. None of the above

C

10. The force that acts on a mass of 1 g and gives it an acceleration of 1 cms-2 is defined as

A. 1 Newton
B. 1 dyne
C. 1 pound-force
D. 1 pa-force

B

11. Einstein’s mass-energy relationship states that if mass decreases by Δm, the energy released ΔE is given by

A. ΔE = Δm × c, where “c” denotes the speed of light
B. ΔE = Δm ⁄ c², where “c” denotes the speed of light
C. ΔE = Δm ⁄ c, where “c” denotes the speed of light
D. ΔE = Δm × c², where “c” denotes the speed of light

D

12. While Young’s modulus ‘E’ relates to change in length and bulk modulus ‘K’ relates to change in volume, modulus of rigidity ‘G’ relates to change in:

A. Weight
B. Density
C. Shape
D. Temperature