## Elastic Constants MCQ question and answers

**1. How many elastic constants of a linear, elastic, isotropic material will be?**

a) 2

b) 3

c) 1

d) 4

Answer: a

**2. How many elastic constants of a non homogeneous, non isotropic material will be?**

a) 9

b) 15

c) 20

d) 21

Answer: d

**3. How can be the Poissons ratio be expressed in terms of bulk modulus(K) and modulus of rigidity(G)?**

a) (3K – 4G) / (6K + 4G)

b) (3K + 4G) /( 6K – 4G)

c) (3K – 2G) / (6K + 2G)

d) (3K + 2G) / (6K – 2G)

Answer: c

**4. Calculate the modulus of resilience for a 2m long bar which extends 2mm under limiting axial stress of 200 N/mm2?**

a) 0.01

b) 0.20

c) 0.10

d) 0.02

Answer: c.

**5. In an experiment, the bulk modulus of elasticity of a material is twice its modulus of rigidity. The Poissons ratio of the material is ___________**

a) 1/7

b) 2/7

c) 3/7

d) 4/7

Answer: b

**6. What will be the value of the Poisson’s ratio if the Youngs modulus E is equal to the bulk modulus K?**

a) 1/2

b) 1/4

c) 1/3

d) 3/4

Answer: c

**7. What is the expression for modulus of rigidity in terms of modulus of elasticity and the Poissons ratio?**

a) G = 3E / 2(1 + μ)

b) G = 5E / (1 + μ)

c) G = E / 2(1 + μ)

d) G = E/ (1 + 2μ)

Answer: c

**8. What is the relationship between Youngs modulus E, modulus of rigidity C, and bulk modulus K?**

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

b) E = 9KC / (9K + C)

c) E = 3KC / (3K + C)

d) E = 3KC / (9K + C)

Answer: a

**9. What is the limiting values of Poisson’s ratio?**

a) -1 and 0.5

b) -1 and -0.5

c) -1 and -0.5

d) 0 and 0.5

Answer: d

**10. What is the relationship between modulus of elasticity and modulus of rigidity?**

a) C = E / 2(1 + μ)

b) C = E / (1 + μ)

c) C = 2E / (1 + μ)

d) C = 2E / 2(1 + μ)

Answer: c