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870+ Strength of Materials Solved MCQs

These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .

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.

The property of material to absorb shock energy without failure is known as….

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

Young’s modulus of Elasticity for perfectly rigid body is….

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

The stress is….

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

The Poisson’s ratio for perfectly rigid body is

A. 1
B. 0
C. -1
D. 0.5
Answer» B. 0
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.

Greater the value of modulus of elasticity more…is the material

A. plastic
B. elastic
C. brittle
D. ductile
Answer» B. elastic
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.

The value of K for perfectly rigid body is

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

Time dependent permanent deformation is called as

A. plastic deformation
B. elastic deformation
C. creep
D. an elastic deformation
Answer» C. creep
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.

The property of material by virtue of which a body returns to its original shape after removal of load is known as

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

The work done in producing strain on a material per unit volume is called

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

The property of material by virtue of which a material can be beaten into plates is called

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

The Combined effect of external forces acting on body is called

A. stress
B. strain
C. load
D. none
Answer» C. load
34.

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

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

The internal resistance which the body offers to meet the load or external force is called

A. stress
B. strain
C. pressure
D. none
Answer» A. stress
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
Answer» A. strain
40.

If L and dL are are length and change in length respectively, then strain is equal to

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

If V is the volume of a rectangular bar subjected to a three dimensional stress state and the Poisson's ratio for the material is 0.5, the change in volume of the bar will be __ _.

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

For material Poisson’s ratio is 0.25. Relation between E and G will be

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

The modulus of elasticity of a material is 210 GPa and its Poisson's ratio is 0.4. The modulus of rigidity of the material is

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

The value of factor of safety is always

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

The value of margin of safety is always

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

If the working load is one third of the ultimate load, the factor of safety is

A. 0.333
B. 3
C. 2
D. 1
Answer» B. 3
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

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