Strength of Materials MCQs Set-1

Page 1 of 4

1.

If all the dimensions of a prismatic bar are doubled, then the maximum stress produced in it under its own weight will

decrease

remain unchanged

increase to four times

increase to two times

2.

If a material has identical properties in all directions, it is said to be

isotropic

orthotropic

homogeneous

elastic

3.

For an isotropic, homogeneous and elastic material obeying Hooke's law, number of independent elastic constants is

9

2

3

1

4.

Limit of proportionality depends upon

type of loading

all of these

type of material

area of cross-section

5.

Modulus of rigidity is defined as the ratio of

stress to strain

longitudinal stress to longitudinal strain

shear stress to shear strain

stress to volumetric strain

6.

In a thin cylindrical shell, the ratio of longitudinal stress to hoop stress is

4

1

0.5

2

7.

Rate of change of bending moment is equal to

rate of loading

shear force

slope

deflection

8.

A continuous beam is one which has

Two supports only

More than two supports

None of these

Less than two supports

9.

In which of the following beam the supports are not situated at the ends?

None of these

Over hanging beam

Simply supported beam

Cantilever beam

10.

In case of biaxial state of normal stresses, the maximum shear stress is equal to

half the sum of normal stresses

the difference of normal stresses

the sum of the normal stresses

half the difference of normal stresses

Page 2 of 4

11.

When a rectangular beam is loaded transversely, the maximum compressive stress develops on

Top fibre

Middle fibre

Bottom fibre

Neutral axis

12.

The behaviour of metals under the action of cyclic stresses is termed as

none of these

creep

endurance

fatigue

13.

Stress in a beam and the section modulus

have unpredictable relationship

are directly proportional

have curvilinear relation

are inversely proportional

14.

Shear stress on principal planes is

minimum

none of these

zero

maximum

15.

The ultimate tensile stress of mild steel compared to ultimate compressive stress is

same

less

more

more or less depending on other factors

16.

A measure of the strength economy of a material is the ratio between

Ultimate strength and density

Ultimate strength and safety

Working strength and density

None of these

17.

Longitudinal stress act __________to the longitudinal axis of the shell.

(a) perpendicular

(b) parallel

(c) either (a) or (b)

(d) none of these

18.

A cantilever is a beam whose

Both ends are fixed

One end is fixed and other free

Both ends are free

None of these

19.

If the principle stresses in plane stress problem are σ₁= 100 MPa, σ₂= 40 MPa, the magnitude of max shear stress (in MPa) will be

60

30

20

50

20.

Maximum bending moment in a beam occurs where

shear force is minimum

shear force is maximum

shear force changes sign

deflection is zero

Page 3 of 4

21.

A beam is of rectangular section. The distribution of shearing stress across a section is

None of these

Rectangular

Triangular

Parabolic

22.

________theory is suitable for brittle material.

Distortion energy theory

Maximum principle stress theory

Maximum strain energy

Maximum shear stress theory

23.

A 100 mm x 5 mm x 5 mm steel bar, free to expand, is heated from 15 ° C to 40 ° . What shall be developed?

No stress

Shear stress

Tensile stress

Compressive stress

24.

The principle stresses are

normal to the principle planes

none of the above

inclined to the principle planes

parallel to the principle planes

25.

In case of over hanging beam the point of contraflexure

None of these

Both (a) and (b)

b) Always lies in the overhanging portion

a) Always lies within the supports

26.

The method of reducing the hoop stresses in cylinders is

both (a) and (b)

none of these

(b) to shrink one cylinder over the other

(a) to make its ends flat

27.

A thin flat ring is rotating at a speed v. The circumferential stress induced is given by

ρV

1/2 ρV³

1/2 ρV²

ρV²

28.

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

pressure

stress

none of these

strain

29.

The strength of the beam mainly depends on

CG of the section

Section modulus

bending beam

It's weight

30.

In a beam when shear force changes sign, the bending moment will be

Zero

Maximum

Minimum

Infinity

Page 4 of 4

31.

The maximum stress in a ring under tension occurs

none of these

along the line of action of load

perpendicular to the line of action of load

at 45 degree with the line of action of load

32.

Working stress is always

less than ultimate stress

none of the above

equal to ultimate stress

more than ultimate stress

33.

Which of the following theories is suitable for ductile material?

Maximum shear stress theory

Maximum principle stress theory

Maximum principle strain theory

none of the above

34.

Which of the following statement is correct with reference to the curved beam theory?

radial stress is zero

shear stress is zero

hoop stress is zero

rending stress is zero

35.

The point of contraflexure occurs in

Simply supported beams

Overhanging beams

All of these

Cantilevers

36.

Maximum principle stress theory was postulated by

Rankine

Mohr

St. Venant

Tresca

37.

Simple stress is often called

direct stress

transverse stress

total stress

none of these

38.

A beam encastered at both the ends is known as

Over hanging beam

Simply supported beam

A fixed beam

A continuous beam

39.

The combined effect of external forces acting on a body is called

load

stress

none of these

strain

40.

Maximum shear stress theory was postulated by

Rankine

St Venant

Tresca

Mohr

Strength of Materials MCQs Set-1

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