# 870+ Strength of Materials Solved MCQs

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1.

## Hooke's law holds good up to..

A. yield point
B. proportional limit
C. plastic limit
D. breaking point
Answer» B. proportional limit
2.

## The ratio of linear stress to linear strain is called as

A. modulus of elasticity
B. modulus of rigidity
C. bulk modulus
D. poisson's ratio
Answer» A. modulus of elasticity
3.

## The modulus of elasticity for mild steel is approximately equal to

A. 80 kn/mm2
B. 100 kn/mm2
C. 110 kn/mm2
D. 210 kn/mm2
Answer» D. 210 kn/mm2
4.

## When the material is loaded with elastic limit , then the stress is ……. to strain.

A. equal
B. directly proportional
C. inversely proportional
D. not equal
Answer» B. directly proportional
5.

## The ratio of ultimate tensile stress to the design stress is known as

A. elastic limit
B. strain
C. factor of safety
D. bulk modulus
Answer» C. factor of safety
6.

## An aluminum member is designed based on

A. yield stress
B. elastic limit stress
C. proof stress
D. ultimate stress
Answer» A. yield stress
7.

## The poisson's ratio for Cast Iron varies from

A. 0.25 to 0.33
B. 0.21 to 0.25
C. 0.23 to 0.27
D. 0.33 to 0.38
Answer» C. 0.23 to 0.27
8.

## The Poisson’s ratio for steel varies from

A. 0.21 to 0.25
B. 0.25 to 0.33
C. 0.33 to 0.38
D. 0.38 to 0.45
Answer» B. 0.25 to 0.33
9.

A. elasticity
B. toughness
C. stiffness
D. resilience
10.

A. zero
B. unity
C. infinity
D. none of these
11.

## The stress is….

A. scalar
B. vector
C. tensor
D. none of the above
12.

A. 1
B. 0
C. -1
D. 0.5
13.

## Shearing strain is represented by………

A. angle of twist
B. angle of shear
C. deforming force
D. deforming torque
Answer» B. angle of shear
14.

A. plastic
B. elastic
C. brittle
D. ductile
15.

## Stress does not depand upon

A. applied force
B. area of c/s
C. modulus of elasticity
D. none
Answer» C. modulus of elasticity
16.

## stress does not depend upon

A. applied force
B. area of c/s
C. change in length
D. none
Answer» C. change in length
17.

## modulus of elasticity for rubber is ……than that for steel.

A. larger than
B. equal to
C. smaller than
D. any of the above
Answer» C. smaller than
18.

## Change in length of the rod due to change in temperature depends on…

A. original length
B. change in temperature
C. coefficient of thermal expansion
D. all of above
Answer» D. all of above
19.

A. zero
B. 1
C. -1
D. infinity
20.

## Time dependent permanent deformation is called as

A. plastic deformation
B. elastic deformation
C. creep
D. an elastic deformation
21.

## Figure out the odd point in the following

A. proportional limit
B. elastic limit
C. yield point
D. fracture point
Answer» D. fracture point
22.

## Engineering stress strain curve and true stress strain curve are equal up to

A. proportional limit
B. elastic limit
C. yield point
D. tensile strength point
Answer» C. yield point
23.

## Shape of true stress strain curve of material depends upon

A. strain
B. strain rate
C. temperature
D. all of the above
Answer» D. all of the above
24.

## Within elastic limit in a loaded material, stress is

A. inversely proportional to strain
B. directly proportional to strain
C. equal to strain
D. none of the above
Answer» B. directly proportional to strain
25.

## The ratio of linear stress to linear strain is known as

A. poisson's ratio
B. bulk modulus
C. modulus of rigidity
D. modulus of elasticity
Answer» D. modulus of elasticity
26.

## the ratio of lateral strain to linear strain is known as

A. poisson's ratio
B. bulk modulus
C. modulus of rigidity
D. modulus of elasticity
Answer» A. poisson's ratio
27.

## The ratio of shear stress to shear strain is known as

A. poisson's ratio
B. bulk modulus
C. modulus of rigidity
D. modulus of elasticity
Answer» C. modulus of rigidity
28.

## The ratio of normal stress of each face of a solid cube to volumetric strain is called

A. poisson's ratio
B. bulk modulus
C. modulus of rigidity
D. modulus of elasticity
Answer» B. bulk modulus
29.

## Hooke's law holds good up to

A. proportional limit
B. yield point
C. elastic limit
D. plastic limit
Answer» A. proportional limit
30.

A. ductility
B. plasticity
C. elasticity
D. resilience
31.

A. resilience
B. ductility
C. elasticity
D. plasticity
32.

A. ductility
B. malleability
C. resilience
D. plasticity
33.

A. stress
B. strain
D. none
34.

## ………….Load is one which is considered to act at a point.

A. triangular
B. uniformly distributed load
C. point
D. none
35.

A. stress
B. strain
C. pressure
D. none
36.

## The Unit of stress in SI unit is

A. mn/mm2
B. kn/mm2
C. n/mm2
D. all of above
Answer» D. all of above
37.

## ……….represents the resistance developed by a unit area of cross section.

A. unit stress
B. total stress
C. either of above
D. all of above
Answer» A. unit stress
38.

## Simple stress is often called

A. direct stress
B. transverse stress
C. total stress
D. any of above
Answer» A. direct stress
39.

## The deformation per unit length is called……….

A. strain
B. tensile stress
C. compressive stress
D. shear stress
40.

A. dl/l
B. l/dl
C. lxdl
D. none
41.

A. v
B. 2v
C. 0.5v
D. 0
42.

A. 0
B. 2g
C. 3g
D. 2.5g
43.

A. 210
B. 75
C. 350
D. 300
44.

A. >1
B. <1
C. =1
D. =0
45.

A. >1
B. <1
C. =1
D. >0
46.

A. 0.333
B. 3
C. 2
D. 1
47.

## If 1 is subtracted from the ratio of yield stress to working stress the quantity obtained is known as

A. margin of safety
B. f.o.s.
C. modulus of elasticity
D. none of the above
Answer» A. margin of safety
48.

## Stress does not depend upon

A. applied force
B. area of c/s
C. change in length
D. none of the above
Answer» C. change in length
49.

## Stress does not depend upon

A. applied force
B. area of c/s
C. modulus of elasticity
D. none of the above
Answer» C. modulus of elasticity
50.

## A metal plate of length L and width b has a circle drawn on it. If it is subjected to a compressive stress acting along its width, the circle will

A. remain circle of same radius
B. become ellipse with major axis along its width
C. become ellipse with major axis along its length
D. become circle of smaller radius
Answer» C. become ellipse with major axis along its length
51.

## If D is the diameter of the sphere, then volumetric strain is equal to

A. two times the strain of diameter
B. 1.5 times the strain of diameter
C. three times the strain of diameter
D. the strain of diameter
Answer» C. three times the strain of diameter
52.

## If L be the length and D be the diameter of cylindrical rod, then volumetric strain of the rod is equal to

A. strain of length plus strain of diameter
B. strain of diameter
C. strain of length plus twice the strain of diameter
D. strain of length
Answer» C. strain of length plus twice the strain of diameter
53.

A. same
B. double
C. three times
D. half
54.

A. p
B. p+wl
C. p+w(l-y)
D. p+wy
55.

A. 9.81ρl2/e
B. 9.81ρl2/2e
C. 9.81ρl/e
D. 9.81ρ2l/2e
56.

A. 4pl/πed1d2
B. 2pl/πed1d2
C. 4pl/ed1d2
D. 4p2l/ed1d2
57.

## If a bar of length L m extends by l mm under load W, the strain is

A. 1000 l/l
B. l/l
C. 0.001 l/l
D. none of the above
Answer» C. 0.001 l/l
58.

## Four wires of same material are applied the same load. In which of the following cases, the elongation will be maximum (length, diameter)?

A. 2m, 1mm
B. 4m, 2mm
C. 8m, 4mm
D. 12m, 6mm
Answer» A. 2m, 1mm
59.

A. 10mpa
B. 20mpa
C. 30mpa
D. 40mpa
60.

A. e/2(1-γ)
B. e/2(1+γ)
C. 2e/(1-γ)
D. 2e/(1+γ)
61.

A. 3k/(1+2γ)
B. 3k(1+2γ)
C. 3k/(1-2γ)
D. 3k(1-2γ)
62.

A. 3/(1+2γ)
B. 3(1+2γ)
C. 3/(1-2γ)
D. 3(1-2γ)
63.

A. 9kg/(3k+g)
B. 9kg/(k+3g)
C. (3k+g)/9kg
D. (k+3g)/9kg
64.

A. 14/5
B. 5/7
C. 7/5
D. 5/14
65.

A. 115
B. 105
C. 145
D. 175
66.

## A bar of 30 mm diameter is subjected to an axial force 280 KN length of bar is 400 m and E= 200GPa. Determine volumetric strain if m=4.

A. 1.46x10-3
B. 9.9 x 10-4
C. 2.9 x 10-3
D. 1.48 x 10-4
Answer» B. 9.9 x 10-4
67.

A. 24 mpa
B. 48mpa
C. 72mpa
D. 94mpa
68.

## A tensile material is having Young’s modulus 2.1 x105 N/mm2 and modulus of Rigidity is 0.82 x105 N/mm2. The value of Bulk Modulus is ..

A. 1.4 x105 n/mm2
B. 1.6 x105 n/mm2
C. 1.81 x105 n/mm2
D. 1.5 x105 n/mm2
Answer» B. 1.6 x105 n/mm2
69.

A. 312mpa
B. 310mpa
C. 320mpa
D. 276mpa
70.

A. 100mpa
B. 200mpa
C. 150mpa
D. 140mpa
71.

A. 3.2mm
B. 2.6mm
C. 4mm
D. 3.6mm
72.

A. 28.3
B. 50.13
C. 84.88
D. 113.18
73.

A. 0.283
B. 0.5
C. 0.85
D. 0.113
74.

A. 50
B. -50
C. 40
D. -40
75.

A. 0.24
B. -0.24
C. 0.32
D. -0.32
76.

A. 50
B. -50
C. 40
D. -40
77.

A. 0.16
B. -0.16
C. 0.24
D. -0.24
78.

A. 0.15
B. -0.15
C. 0.24
D. -0.24
79.

A. 0.95
B. -0.95
C. 0.5
D. -0.5
80.

A. aluminum
B. copper
C. steel
D. none of these
81.

A. aluminum
B. copper
C. steel
D. none of these
82.

## A steel bar ABC (E = 200 GPa) is 1 m long. For AB = 0.7 m, it has cross section P area of 500 mm2 and for BC = 0.3 m the cross section area is 400 mm2. The bar is subjected to an axial pull of 100 kN. The stress is maximum in ___ _

A. ab
B. bc
C. same throughout
D. none of these
83.

A. 0.5
B. 0.75
C. 0.1
D. 0.15
84.

A. 1
B. 2
C. 0.5
D. 4
85.

A. 1000
B. 1000.25
C. 999.25
D. 0.25
86.

A. 1
B. 2
C. 0.5
D. 4
87.

A. 1 : 2
B. 2 : 1
C. 1 : 1
D. 4 : 1
Answer» D. 4 : 1
88.

A. 1:1
B. 1:2
C. 1:1
D. 4:1
89.

A. 1 : 2
B. 2 : 1
C. 1 : 1
D. 4 : 1
Answer» B. 2 : 1
90.

A. 1.5
B. 1.5*10-4
C. 1.33*10-3
D. 0.0455
91.

A. 120mpa
B. 10gpa
C. 12gpa
D. 120gpa
92.

A. 1mm
B. 1.2mm
C. 0.5mm
D. 0.25mm
93.

A. 2n
B. 2.5kn
C. 5n
D. 5.5kn
94.

A. 10mpa
B. 10gpa
C. 1mpa
D. 1gpa
95.

A. 0
B. 10
C. 20
D. 15
96.

A. >1
B. <1
C. =1
D. =0
97.

A. >1
B. <1
C. =1
D. =0
98.

## The radius of wire stretched by a load is doubled, then its Modulus of elasticity will be..

A. doubled
B. halved
C. becomes 4 times
D. unaffected
99.

## The factor of safety depends on i)Magnitude of external force ii) Properties of material iii) Dimension of the component iv) All of the above

A. i) and ii)
B. ii) and iii)
C. i) , ii) and iii)
D. iv
100.

A. eαt
B. et/α
C. eα/t
D. 1/eαt