Strength of Materials MCQs Set-1

Page 1 of 4

1.

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

50

20

60

30

2.

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?

Tensile stress

Compressive stress

No stress

Shear stress

3.

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

4.

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

orthotropic

homogeneous

elastic

isotropic

5.

The point of contraflexure occurs in

Simply supported beams

Overhanging beams

All of these

Cantilevers

6.

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

more or less depending on other factors

more

less

same

7.

Simple stress is often called

direct stress

none of these

transverse stress

total stress

8.

Limit of proportionality depends upon

all of these

type of material

type of loading

area of cross-section

9.

The method of reducing the hoop stresses in cylinders is

(a) to make its ends flat

both (a) and (b)

none of these

(b) to shrink one cylinder over the other

10.

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

rending stress is zero

radial stress is zero

shear stress is zero

hoop stress is zero

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11.

Stress in a beam and the section modulus

are directly proportional

are inversely proportional

have unpredictable relationship

have curvilinear relation

12.

Which of the following theories is suitable for ductile material?

none of the above

Maximum principle strain theory

Maximum shear stress theory

Maximum principle stress theory

13.

Maximum shear stress theory was postulated by

Tresca

St Venant

Mohr

Rankine

14.

A continuous beam is one which has

More than two supports

Two supports only

Less than two supports

None of these

15.

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

4

2

1

0.5

16.

________theory is suitable for brittle material.

Distortion energy theory

Maximum shear stress theory

Maximum principle stress theory

Maximum strain energy

17.

In case of over hanging beam the point of contraflexure

b) Always lies in the overhanging portion

a) Always lies within the supports

None of these

Both (a) and (b)

18.

Modulus of rigidity is defined as the ratio of

longitudinal stress to longitudinal strain

stress to strain

stress to volumetric strain

shear stress to shear strain

19.

Shear stress on principal planes is

zero

maximum

none of these

minimum

20.

The principle stresses are

inclined to the principle planes

normal to the principle planes

none of the above

parallel to the principle planes

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21.

Rate of change of bending moment is equal to

shear force

slope

deflection

rate of loading

22.

Maximum principle stress theory was postulated by

Rankine

Mohr

St. Venant

Tresca

23.

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

half the difference of normal stresses

the sum of the normal stresses

the difference of normal stresses

half the sum of normal stresses

24.

A cantilever is a beam whose

Both ends are fixed

Both ends are free

None of these

One end is fixed and other free

25.

The maximum stress in a ring under tension occurs

at 45 degree with the line of action of load

along the line of action of load

none of these

perpendicular to the line of action of load

26.

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

fatigue

creep

none of these

endurance

27.

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

Triangular

Parabolic

None of these

Rectangular

28.

The strength of the beam mainly depends on

CG of the section

Section modulus

It's weight

bending beam

29.

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

load

strain

stress

none of these

30.

Working stress is always

less than ultimate stress

more than ultimate stress

none of the above

equal to ultimate stress

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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 ρV³

ρV

1/2 ρV²

32.

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

Ultimate strength and density

Working strength and density

Ultimate strength and safety

None of these

33.

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

3

1

2

9

34.

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

Minimum

Infinity

Maximum

Zero

35.

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

none of these

pressure

strain

stress

36.

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

Neutral axis

Middle fibre

Bottom fibre

Top fibre

37.

Longitudinal stress act __________to the longitudinal axis of the shell.

(d) none of these

(c) either (a) or (b)

(a) perpendicular

(b) parallel

38.

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

Cantilever beam

Over hanging beam

None of these

Simply supported beam

39.

A beam encastered at both the ends is known as

Over hanging beam

Simply supported beam

A continuous beam

A fixed beam

40.

Maximum bending moment in a beam occurs where

shear force changes sign

shear force is minimum

shear force is maximum

deflection is zero

Strength of Materials MCQs Set-1

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