Strength of Materials MCQs Set-1

Page 1 of 4

1.

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

homogeneous

orthotropic

isotropic

elastic

2.

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

Neutral axis

Middle fibre

Top fibre

Bottom fibre

3.

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

strain

none of these

load

stress

4.

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

3

2

1

9

5.

The point of contraflexure occurs in

Simply supported beams

Overhanging beams

All of these

Cantilevers

6.

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

7.

A beam encastered at both the ends is known as

A continuous beam

Simply supported beam

A fixed beam

Over hanging beam

8.

Stress in a beam and the section modulus

are inversely proportional

have unpredictable relationship

are directly proportional

have curvilinear relation

9.

The strength of the beam mainly depends on

It's weight

bending beam

CG of the section

Section modulus

10.

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

None of these

Cantilever beam

Simply supported beam

Over hanging beam

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11.

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 sum of the normal stresses

the difference of normal stresses

12.

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

1/2 ρV³

ρV²

ρV

1/2 ρV²

13.

Which of the following theories is suitable for ductile material?

none of the above

Maximum shear stress theory

Maximum principle stress theory

Maximum principle strain theory

14.

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

2

0.5

1

4

15.

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

50

20

30

16.

Longitudinal stress act __________to the longitudinal axis of the shell.

(c) either (a) or (b)

(b) parallel

(a) perpendicular

(d) none of these

17.

The principle stresses are

inclined to the principle planes

parallel to the principle planes

normal to the principle planes

none of the above

18.

A cantilever is a beam whose

Both ends are fixed

Both ends are free

One end is fixed and other free

None of these

19.

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

strain

none of these

stress

pressure

20.

The method of reducing the hoop stresses in cylinders is

(b) to shrink one cylinder over the other

both (a) and (b)

none of these

(a) to make its ends flat

Page 3 of 4

21.

________theory is suitable for brittle material.

Maximum shear stress theory

Maximum strain energy

Distortion energy theory

Maximum principle stress theory

22.

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

23.

A continuous beam is one which has

None of these

More than two supports

Less than two supports

Two supports only

24.

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

fatigue

endurance

creep

none of these

25.

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 two times

increase to four times

26.

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

Zero

Minimum

Infinity

Maximum

27.

Maximum principle stress theory was postulated by

St. Venant

Mohr

Rankine

Tresca

28.

Maximum bending moment in a beam occurs where

shear force changes sign

shear force is minimum

shear force is maximum

deflection is zero

29.

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

30.

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

Parabolic

Rectangular

Triangular

None of these

Page 4 of 4

31.

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

32.

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

less

more

more or less depending on other factors

same

33.

Maximum shear stress theory was postulated by

Mohr

Tresca

Rankine

St Venant

34.

Shear stress on principal planes is

none of these

minimum

zero

maximum

35.

Limit of proportionality depends upon

type of loading

area of cross-section

all of these

type of material

36.

Simple stress is often called

direct stress

none of these

total stress

transverse stress

37.

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

Compressive stress

Tensile stress

No stress

38.

Working stress is always

less than ultimate stress

more than ultimate stress

equal to ultimate stress

none of the above

39.

Rate of change of bending moment is equal to

slope

shear force

rate of loading

deflection

40.

In case of over hanging beam the point of contraflexure

b) Always lies in the overhanging portion

a) Always lies within the supports

Both (a) and (b)

None of these

Strength of Materials MCQs Set-1

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