Strength of Materials MCQs Set-1

Page 1 of 4

1.

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

Working strength and density

Ultimate strength and density

None of these

Ultimate strength and safety

2.

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

half the sum of normal stresses

the sum of the normal stresses

half the difference of normal stresses

the difference of normal stresses

3.

Working stress is always

more than ultimate stress

less than ultimate stress

equal to ultimate stress

none of the above

4.

Maximum principle stress theory was postulated by

Tresca

Rankine

St. Venant

Mohr

5.

Longitudinal stress act __________to the longitudinal axis of the shell.

(c) either (a) or (b)

(b) parallel

(d) none of these

(a) perpendicular

6.

Rate of change of bending moment is equal to

rate of loading

slope

shear force

deflection

7.

Maximum bending moment in a beam occurs where

shear force changes sign

shear force is minimum

shear force is maximum

deflection is zero

8.

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

pressure

stress

strain

none of these

9.

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

creep

endurance

fatigue

none of these

10.

The point of contraflexure occurs in

Simply supported beams

All of these

Cantilevers

Overhanging beams

Page 2 of 4

11.

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

load

stress

none of these

strain

12.

Stress in a beam and the section modulus

have unpredictable relationship

are inversely proportional

have curvilinear relation

are directly proportional

13.

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

rending stress is zero

shear stress is zero

hoop stress is zero

radial stress is zero

14.

A beam encastered at both the ends is known as

Simply supported beam

Over hanging beam

A fixed beam

A continuous beam

15.

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

16.

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

elastic

orthotropic

homogeneous

isotropic

17.

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

same

more or less depending on other factors

more

less

18.

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

ρV²

1/2 ρV³

1/2 ρV²

ρV

19.

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

Rectangular

Triangular

None of these

Parabolic

20.

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

30

20

60

Page 3 of 4

21.

________theory is suitable for brittle material.

Distortion energy theory

Maximum principle stress theory

Maximum shear stress theory

Maximum strain energy

22.

The strength of the beam mainly depends on

CG of the section

bending beam

Section modulus

It's weight

23.

Limit of proportionality depends upon

type of loading

all of these

area of cross-section

type of material

24.

A cantilever is a beam whose

One end is fixed and other free

Both ends are free

Both ends are fixed

None of these

25.

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

Infinity

Maximum

Minimum

Zero

26.

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

Bottom fibre

Top fibre

Neutral axis

Middle fibre

27.

Modulus of rigidity is defined as the ratio of

stress to volumetric strain

stress to strain

longitudinal stress to longitudinal strain

shear stress to shear strain

28.

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

Cantilever beam

None of these

Over hanging beam

Simply supported beam

29.

Simple stress is often called

none of these

transverse stress

direct stress

total stress

30.

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

increase to two times

remain unchanged

decrease

increase to four times

Page 4 of 4

31.

Maximum shear stress theory was postulated by

Tresca

Rankine

St Venant

Mohr

32.

A continuous beam is one which has

Less than two supports

None of these

More than two supports

Two supports only

33.

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

2

0.5

4

1

34.

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

3

2

1

9

35.

The maximum stress in a ring under tension occurs

along the line of action of load

none of these

perpendicular to the line of action of load

at 45 degree with the line of action of load

36.

The principle stresses are

normal to the principle planes

inclined to the principle planes

none of the above

parallel to the principle planes

37.

In case of over hanging beam the point of contraflexure

b) Always lies in the overhanging portion

Both (a) and (b)

a) Always lies within the supports

None of these

38.

Shear stress on principal planes is

none of these

zero

minimum

maximum

39.

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?

Shear stress

Tensile stress

No stress

Compressive stress

40.

Which of the following theories is suitable for ductile material?

Maximum principle strain theory

Maximum shear stress theory

none of the above

Maximum principle stress theory

Strength of Materials MCQs Set-1

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