Table of Contents

## 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

**2. Force per unit area is equal to _____.**

A. Force

B. Momentum

C. Torque

D. None of these

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

A. Mass

B. Momentum

C.Presure

D.None of these

**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

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

**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

**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

**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

**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

**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

**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

**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