Mcq of module 1 stress and strain

1. MULTIPLE CHOICE QUESTIONS FOR SSC JE
EXAM-2020
BY- YOGENDRA KUMAR
LECTURER MECHANICAL ENGG.
GLA UNIVERSITY MATHURA

2. 1.Stress is
A. External force
B. Internal resistive force
C. Axial force
D. Radial force
(Ans:b)
2.Following are the
basic types of stress
except
A. Tensile stress
B. Compressive stress
C. Shear stress
D. Volumetric stress
(Ans:d)
3.When tensile stress is applied
axially on a circular rod its
I. diameter decreases
II. length increases
III. volume decreases
IV. Which of the above are true?
A. Only i
B. Only ii
C. i & ii
D. All of the above
(Ans:c)
4.When tensile stress is applied
axially on a circular rod its
i. diameter increases
ii. length decreases
iii. volume decreases
iv. Which of the above are true?
A. Only i
B. Only ii
C. i & ii
D. All of the above
(Ans:c)

3. 5. Which of the following is not a
basic type of strain?
A. Compressive strain
B. Shear strain
C. Area strain
D. Volume strain
(Ans:c)
6.. 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
(Ans:a)
7. 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
(Ans:b)
8. 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
(Ans:c)

4. 9. Hooke’s law is applicable within
A. Elastic limit
B. Plastic limit
C. Fracture point
D. Ultimate strength
(Ans:a)
10. 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
(Ans:a)
11. Modulus of rigidity is
A. Tensile stress / Tensile strain
B. Shear stress / Shear strain
C. Tensile stress / Shear strain
D. Shear stress / Tensile strain
(Ans:b)
12. 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
(Ans:d)

5. 13. Factor of safety is
A. Tensile stress / Permissible stress
B. Compressive stress / Ultimate stress
C. Ultimate stress / Permissible stress
D. Ultimate stress / Shear stress
(Ans:c)
15. A rod, 120cm long and of diameter 3.0
cm is subjected to an axial pull of 18 kN.
The stress in N/mm2 is.
A. 22.57
B. 23.47
C. 24.57
D. 25.47
(Ans:d)
14. Poisson’s ratio is
A. Lateral strain / Longitudinal strain
B. Shear strain / Lateral strain
C. Longitudinal strain / Lateral strain
D. Lateral strain / Volumetric strain
(Ans:a)
16.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)
Where P=Load applied, E=young’s modulus for the bar,
L1,2,3=Length of corresponding bars, A1,2,3=Area of
corresponding bars
(Ans:a)

6. 17. 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)
(Ans:b)
18. 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)
(Ans:a)
19. 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
Where E=Young’s modulus of elasticity
(Ans:a)
20. Elongation of a bar of uniform cross section of
length ‘L’, due to its own weight ‘W’ is given by
A. 2WL/AE
B. WL/AE
C. WL/2AE
D. WL/3AE
Where, E=Young’s modulus of elasticity of material
(Ans:c)

7. 21. A rigid body has Poisson's ratio
equal to _____
a. 0
b. 1
c. less than 1
d. greater than one
ANS. A
22. 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
ANS. C
23. 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
ANS. C
24. 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
ANS. A

8. 25.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)
ANS. D
26. 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
ANS . B
26. 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
ANS . B
28.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
ANS. C

9. 1. The slope of the stress-strain curve in the
elastic deformation region is ____________
a) Elastic modulus
b) Plastic modulus
c) Poisson’s ratio
d) None of the mentioned
Answer: a
2. What is the stress-strain curve?
a) It is the percentage of stress and stain
b) It is the relationship between stress and strain
c) It is the difference between stress and strain
d) None of the mentioned
Answer: b
3. Which point on the stress strain curve occurs
after the proportionality limit?
a) Upper yield point
b) Lower yield point
c) Elastic limit
d) Ultimate point
Answer: c
4. Which point on the stress strain curve
occurs after the lower yield point?
a) Yield plateau
b) Upper yield point
c) Ultimate point
d) None of the mentioned
Answer: a

10. 5. Which point on the stress strain curve
occurs after yield plateau?
a) lower yield point
b) Upper yield point
c) Ultimate point
d) Breaking point
Answer: c
6. Which point on the stress strain curve
occurs after the ultimate point?
a) Last point
b) Breaking point
c) Elastic limit
d) Material limit
Answer: b
7. Elastic limit is the point ____________
a) up to which stress is proportional to strain
b) At which elongation takes place without application of
additional load
c) Up to which if the load is removed, original volume and
shapes are regained
d) None of the mentioned
Answer: c
8. What is the point P shown on the stress strain curve?
a) Upper yield point
b) Yield plateau
c) Elastic limit
d) Ultimate point
Answer: d

11. 9. What is the point P shown in the stress-strain
curve?
a) Lower yield point
b) Elastic limit
c) Proportionality limit
d) Breaking point
Answer: d
10. What is the point shown in the stress strain
curve?
a) Elastic limit
b) Lower yield point
c) Yield plateau
d) Lower strain point
View Answer
Answer: b
11. Where is the necking region?
a) The area between lower yield point and upper
yield point
b) The area between the plastic limit and elastic
limit
c) The area between the ultimate point and initial
point
d) The area between the ultimate point and
rupture
Answer: d
12. Which of these is a non-hoookean material?
a) Steel
b) Rubber
c) Aluminium
d) Copper
Answer: b

12. 13.The law which states that within elastic
limits strain produced is proportional to the
stress producing it is known as _____________
a) Bernoulli’s law
b) Hooke’s law
c) Stress law
d) Poisson’s law
Answer: b
14. For an isotropic, homogeneous and elastic
material obeying Hooke’s law, the number of
independent elastic constants is ____________
a) 2
b) 3
c) 9
d) 1
Answer: b
15. What is the factor of safety?
a) The ratio of stress to strain
b) The raio of permissible stress to the ultimate
stress
c) The ratio of ultimate stress to the permissible
stress
d) The ratio of longitudinal strain to stress
Answer: c
16. Limit of proportionality depends upon
____________
a) Area of cross-section
b) Type of loading
c) Type of material
d) All of the mentioned
Answer: a

13. 17. The stress at which extension of a material
takes place more quickly as compared to the
increase in load is called ____________
a) Elastic point
b) Plastic point
c) Breaking point
d) Yielding point
Answer: d
18. Where in the stress-strain curve, the
hooke’s law is valid?
a) Strain hardening region
b) Necking region
c) Elastic range
d) Valid everywhere
Answer: c
19. Highest value of stress for which Hooke’s
law is applicable for a given material is called
____________
a) Stress limit
b) Strain limit
c) Proportional limit
d) Significant limit
Answer: c
20.What is Hooke’s law for the 1-D system?
a) The relation between normal stress and the
corresponding strain
b) The relation between shear stress and the
corresponding strain
c) The relation between lateral strain and the
corresponding stress
d) None of the mentioned
Answer: a