Strength of Materials MCQs Set-1

Page 1 of 4

1.

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

3

1

9

2

2.

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

Top fibre

Neutral axis

Bottom fibre

Middle fibre

3.

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

None of these

Working strength and density

Ultimate strength and safety

Ultimate strength and density

4.

Maximum principle stress theory was postulated by

Mohr

St. Venant

Tresca

Rankine

5.

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

6.

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

7.

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

0.5

1

4

2

8.

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

Rectangular

Triangular

None of these

Parabolic

9.

Maximum shear stress theory was postulated by

Rankine

Tresca

Mohr

St Venant

10.

Shear stress on principal planes is

zero

maximum

none of these

minimum

Page 2 of 4

11.

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

none of these

strain

pressure

stress

12.

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

more

same

more or less depending on other factors

less

13.

A cantilever is a beam whose

None of these

Both ends are free

Both ends are fixed

One end is fixed and other free

14.

The point of contraflexure occurs in

Overhanging beams

All of these

Cantilevers

Simply supported beams

15.

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

none of these

along the line of action of load

16.

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

17.

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

18.

Longitudinal stress act __________to the longitudinal axis of the shell.

(d) none of these

(a) perpendicular

(b) parallel

(c) either (a) or (b)

19.

Rate of change of bending moment is equal to

rate of loading

deflection

shear force

slope

20.

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

none of these

creep

endurance

fatigue

Page 3 of 4

21.

________theory is suitable for brittle material.

Maximum shear stress theory

Maximum strain energy

Maximum principle stress theory

Distortion energy theory

22.

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

elastic

orthotropic

isotropic

homogeneous

23.

Working stress is always

less than ultimate stress

more than ultimate stress

none of the above

equal to ultimate stress

24.

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

25.

Stress in a beam and the section modulus

are inversely proportional

are directly proportional

have unpredictable relationship

have curvilinear relation

26.

Which of the following theories is suitable for ductile material?

Maximum shear stress theory

none of the above

Maximum principle stress theory

Maximum principle strain theory

27.

Maximum bending moment in a beam occurs where

shear force changes sign

deflection is zero

shear force is maximum

shear force is minimum

28.

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

50

20

29.

Modulus of rigidity is defined as the ratio of

longitudinal stress to longitudinal strain

shear stress to shear strain

stress to strain

stress to volumetric strain

30.

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

Page 4 of 4

31.

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

Maximum

Minimum

Infinity

Zero

32.

A continuous beam is one which has

None of these

Two supports only

More than two supports

Less than two supports

33.

Simple stress is often called

none of these

total stress

direct stress

transverse stress

34.

A beam encastered at both the ends is known as

Over hanging beam

Simply supported beam

A fixed beam

A continuous beam

35.

The method of reducing the hoop stresses in cylinders is

both (a) and (b)

(a) to make its ends flat

none of these

(b) to shrink one cylinder over the other

36.

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

rending stress is zero

radial stress is zero

hoop stress is zero

shear stress is zero

37.

The principle stresses are

none of the above

parallel to the principle planes

inclined to the principle planes

normal to the principle planes

38.

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

load

stress

strain

none of these

39.

The strength of the beam mainly depends on

CG of the section

bending beam

It's weight

Section modulus

40.

Limit of proportionality depends upon

area of cross-section

type of material

all of these

type of loading

Strength of Materials MCQs Set-1

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