Mechanical Engineering MCQ Question Papers: DRDO, ISRO, Interview

Subject: Strength of Materials 8

**Part 2: List for questions and answers of Strength of Materials**

**Q1. Stress is**

a) External force

b) Internal resistive force

c) Axial force

d) Radial force

**Q2. Following are the basic types of stress except**

a) Tensile stress

b) Compressive stress

c) Shear stress

d) Volumetric stress

**Q3. Which of the following is not a basic type of strain?**

a) Compressive strain

b) Shear strain

c) Area strain

d) Volume strain

**Q4. Tensile Strain is**

a) Increase in length / original length

b) Decrease in length / original length

c) Change in volume / original volume

d) All of the above

**Q5. Compressive Strain is**

a) Increase in length / original length

b) Decrease in length / original length

c) Change in volume / original volume

d) All of the above

**Q6. Volumetric Strain is**

a) Increase in length / original length

b) Decrease in length / original length

c) Change in volume / original volume

d) All of the above

**Q7. Hooke’s law is applicable within**

a) Elastic limit

b) Plastic limit

c) Fracture point

d) Ultimate strength

**Q8. Young’s Modulus of elasticity is**

a) Tensile stress / Tensile strain

b) Shear stress / Shear strain

c) Tensile stress / Shear strain

d) Shear stress / Tensile strain

**Q9. Modulus of rigidity is**

a) Tensile stress / Tensile strain

b) Shear stress / Shear strain

c) Tensile stress / Shear strain

d) Shear stress / Tensile strain

**Q10. Bulk modulus of elasticity is**

a) Tensile stress / Tensile strain

b) Shear stress / Shear strain

c) Tensile stress / Shear strain

d) Normal stress on each face of cube / Volumetric strain

**Q11. Factor of safety is**

a) Tensile stress / Permissible stress

b) Compressive stress / Ultimate stress

c) Ultimate stress / Permissible stress

d) Ultimate stress / Shear stress

**Q12. Poisson’s ratio is**

a) Lateral strain / Longitudinal strain

b) Shear strain / Lateral strain

c) Longitudinal strain / Lateral strain

d) Lateral strain / Volumetric strain

**Q13. A rod, 120cm long and of diameter 3.0 cm is subjected to an axial pull of 18 kn. The stress in N/mm^2 is**

a) 22.57

b) 23.47

c) 24.57

d) 25.47

**Q14. The total extension in a bar, consists of 3 bars of same material, of varying sections is**

a) P/E(L1/A1+L2/A2+L3/A3)

b) P/E(L1A1+L2A2+L3A3)

c) PE(L1/A1+L2/A2+L3/A3)

d) PE(L1/A1+L2/A2+L3/A3)

**Q15. The relationship between Young’s modulus (E), Bulk modulus (K) and Poisson’s ratio (μ) is given by**

a) E=2K(1-2μ)

b) E=3K(1-2μ)

c) E=2K(1-2μ)

d) E=2K(1-3μ)

**Q16. The relationship between Young’s modulus (E), Modulus of rigidity (C) and Bulk modulus (K) is given by**

a) E=9CK/(C+3K)

b) E=9CK/(2C+3K)

c) E=9CK/(3C+K)

d) E=9CK/(C-3K)

**Q17. The total extension of a taper rod of length ‘L’ and end diameters ‘D1’ and ‘D2’, subjected to a load (P), is given of**

a) 4PL/ΠE. D1D2

b) 3PL/ΠE. D1D2

c) 2PL/ΠE. D1D2

d) PL/ΠE.D1D2

**Q18. A rod 3 m long is heated from 10°C to 90°C. Find the expansion of rod. Take Young’s modulus = 1.0 x 10^5 MN/m^2 and coefficient of thermal expansion = 0.000012 per degree centigrade**

a) 0.168 cm

b) 0.208 cm

c) 0.288 cm

d) 0.348 cm

**Q19. Elongation of a bar of uniform cross section of length ‘L’, due to its own weight ‘W’ is given by**

a) 2WL/E

b) WL/E

c) WL/2E

d) WL/3E

**Q20. A rigid body has Poisson’s ratio equal to…….**

a) 0

b) 1

c) Less than 1

d) Greater than one

**Part 2: List for questions and answers of Strength of Materials**

Q1. Answer: b

Q2. Answer: d

Q3. Answer: c

Q4. Answer: a

Q5. Answer: b

Q6. Answer: c

Q7. Answer: a

Q8. Answer: a

Q9. Answer: b

Q10. Answer: d

Q11. Answer: c

Q12. Answer: a

Q13. Answer: d

Q14. Answer: a

Q15. Answer: b

Q16. Answer: a

Q17. Answer: a

Q18. Answer: c

Q19. Answer: c

Q20. Answer: a