Strength of Materials MCQs Set-1

Page 1 of 4

1.

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

Ultimate strength and density

None of these

Working strength and density

Ultimate strength and safety

2.

Working stress is always

less than ultimate stress

more than ultimate stress

none of the above

equal to ultimate stress

3.

Stress in a beam and the section modulus

are inversely proportional

are directly proportional

have curvilinear relation

have unpredictable relationship

4.

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

hoop stress is zero

rending stress is zero

shear stress is zero

radial stress is zero

5.

Rate of change of bending moment is equal to

deflection

slope

rate of loading

shear force

6.

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

Compressive stress

Tensile stress

7.

A cantilever is a beam whose

None of these

One end is fixed and other free

Both ends are free

Both ends are fixed

8.

A beam encastered at both the ends is known as

Simply supported beam

A continuous beam

Over hanging beam

A fixed beam

9.

Maximum principle stress theory was postulated by

Mohr

Tresca

St. Venant

Rankine

10.

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

Simply supported beam

Over hanging beam

None of these

Cantilever beam

Page 2 of 4

11.

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

Rectangular

None of these

Triangular

Parabolic

12.

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

Neutral axis

Bottom fibre

Middle fibre

Top fibre

13.

In case of over hanging beam the point of contraflexure

None of these

Both (a) and (b)

a) Always lies within the supports

b) Always lies in the overhanging portion

14.

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

9

3

1

2

15.

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

4

0.5

2

1

16.

Shear stress on principal planes is

none of these

zero

maximum

minimum

17.

Simple stress is often called

total stress

direct stress

transverse stress

none of these

18.

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

Minimum

Maximum

Zero

Infinity

19.

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

fatigue

endurance

none of these

creep

20.

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

strain

none of these

load

stress

Page 3 of 4

21.

Limit of proportionality depends upon

type of material

area of cross-section

type of loading

all of these

22.

The maximum stress in a ring under tension occurs

at 45 degree with the line of action of load

perpendicular to the line of action of load

along the line of action of load

none of these

23.

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

half the difference of normal stresses

half the sum of normal stresses

the difference of normal stresses

the sum of the normal stresses

24.

A continuous beam is one which has

Less than two supports

Two supports only

More than two supports

None of these

25.

The point of contraflexure occurs in

Overhanging beams

Cantilevers

Simply supported beams

All of these

26.

Which of the following theories is suitable for ductile material?

none of the above

Maximum principle stress theory

Maximum shear stress theory

Maximum principle strain theory

27.

The strength of the beam mainly depends on

bending beam

CG of the section

It's weight

Section modulus

28.

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

pressure

none of these

stress

strain

29.

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

isotropic

homogeneous

elastic

orthotropic

30.

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

remain unchanged

increase to two times

increase to four times

decrease

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31.

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

ρV²

1/2 ρV²

ρV

1/2 ρV³

32.

________theory is suitable for brittle material.

Maximum shear stress theory

Maximum principle stress theory

Distortion energy theory

Maximum strain energy

33.

Maximum bending moment in a beam occurs where

shear force is minimum

shear force is maximum

shear force changes sign

deflection is zero

34.

Modulus of rigidity is defined as the ratio of

longitudinal stress to longitudinal strain

shear stress to shear strain

stress to volumetric strain

stress to strain

35.

The method of reducing the hoop stresses in cylinders is

(b) to shrink one cylinder over the other

(a) to make its ends flat

both (a) and (b)

none of these

36.

Maximum shear stress theory was postulated by

St Venant

Tresca

Rankine

Mohr

37.

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

38.

Longitudinal stress act __________to the longitudinal axis of the shell.

(b) parallel

(d) none of these

(c) either (a) or (b)

(a) perpendicular

39.

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

less

same

more or less depending on other factors

more

40.

The principle stresses are

parallel to the principle planes

inclined to the principle planes

normal to the principle planes

none of the above

Strength of Materials MCQs Set-1

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