Simple Stresses and Strains - Mechanical Engineering (MCQ) questions and answers

1)   A rectangular bar has volume of 1.5 x 106 mm3. What is the change in volume, if stresses in x, y and z direction are 100 Mpa, 150 Mpa and 160 Mpa respectively. (Assume K = 2 x 105 N/mm2 & μ = 0.3)

a. 1000 mm3
b. 1230 mm3
c. 1500 mm3
d. 2000 mm3
Answer  Explanation 

ANSWER: 1230 mm3

Explanation:
No explanation is available for this question!
2)   A rigid body has Poisson's ratio equal to _____

a. 0
b. 1
c. less than 1
d. greater than one
Answer  Explanation 

ANSWER: 0

Explanation:
No explanation is available for this question!
3)   The ratio of stress and strain is known as _____

a. Modulus of elasticity
b. Young's modulus
c. Both a. and b.
d. None of the above
Answer  Explanation 

ANSWER: Both a. and b.

Explanation:
No explanation is available for this question!
4)   Two parallel, equal and opposite forces acting tangentially to the surface of the body is called as _____

a. Complementary stress
b. Compressive stress
c. Shear stress
d. Tensile stress
Answer  Explanation 

ANSWER: Shear stress

Explanation:
No explanation is available for this question!
5)   What is the bulk modulus of a material, if a cube of 100 mm changes its volume to 4000 mm3 when subjected to compressive force of 2.5 x 106 N?

a. 62.5 Gpa
b. 65 Gpa
c. 67.5 Gpa
d. 70 Gpa
Answer  Explanation 

ANSWER: 62.5 Gpa

Explanation:
No explanation is available for this question!
6)   The relation between modulus of elasticity (E), modulus of rigidity (G) and bulk modulus (K) is given as ________

a. K+G / (3K+ G)
b. 3 KG / (3K+ G)
c. 3 KG / (9K+ G)
d. 9 KG / (3K+ G)
Answer  Explanation 

ANSWER: 9 KG / (3K+ G)

Explanation:
No explanation is available for this question!
7)   The actual breaking stress in stress-strain diagram is the ratio of ______

a. load at breaking point and original cross-sectional area
b. load at breaking point and reduced cross-sectional area
c. maximum load and original cross-sectional area
d. yield load and original cross-sectional area
Answer  Explanation 

ANSWER: load at breaking point and reduced cross-sectional area

Explanation:
No explanation is available for this question!
8)   Modulus of rigidity is the ratio of ______

a. Lateral strain and linear strain
b. Linear stress and lateral strain
c. Shear stress and shear strain
d. Shear strain and shear stress
Answer  Explanation 

ANSWER: Shear stress and shear strain

Explanation:
No explanation is available for this question!
9)   In the diagram shown below, a tensile load of 50 kN is applied axially. What is the increase in length of the rectangular tapered plate of width 10 mm. (Assume E = 220 Gpa)

a. 0.10 mm
b. 0.161 mm
c. 0.126 mm
d. 0.56 mm
Answer  Explanation 

ANSWER: 0.126 mm

Explanation:
No explanation is available for this question!
10)   When a rectangular bar is uniaxially loaded, the volumetric strain (ev) is given as ________

a. σx / E(1- μ)
b. σx / E(1+ μ)
c. σx / E(1- 2μ)
d. σx / E(1+2μ)
Answer  Explanation 

ANSWER: σx / E(1- 2μ)

Explanation:
No explanation is available for this question!

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