Strength of Materials MCQs Set-1

Page 1 of 4

1.

The point of contraflexure occurs in

All of these

Cantilevers

Simply supported beams

Overhanging beams

2.

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

none of these

creep

fatigue

endurance

3.

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

decrease

increase to four times

increase to two times

remain unchanged

4.

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

elastic

orthotropic

homogeneous

isotropic

5.

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

Parabolic

None of these

Triangular

Rectangular

6.

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

same

more

less

more or less depending on other factors

7.

Which of the following theories is suitable for ductile material?

Maximum shear stress theory

none of the above

Maximum principle strain theory

Maximum principle stress theory

8.

Shear stress on principal planes is

minimum

none of these

maximum

zero

9.

________theory is suitable for brittle material.

Distortion energy theory

Maximum strain energy

Maximum principle stress theory

Maximum shear stress theory

10.

Simple stress is often called

direct stress

none of these

transverse stress

total stress

Page 2 of 4

11.

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

Infinity

Zero

Minimum

Maximum

12.

A cantilever is a beam whose

Both ends are free

None of these

One end is fixed and other free

Both ends are fixed

13.

The principle stresses are

inclined to the principle planes

none of the above

parallel to the principle planes

normal to the principle planes

14.

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

half the difference of normal stresses

the sum of the normal stresses

15.

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

None of these

Ultimate strength and density

Ultimate strength and safety

Working strength and density

16.

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

stress

pressure

none of these

strain

17.

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

Over hanging beam

None of these

Cantilever beam

Simply supported beam

18.

Maximum bending moment in a beam occurs where

shear force changes sign

shear force is maximum

deflection is zero

shear force is minimum

19.

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

1/2 ρV³

1/2 ρV²

ρV²

ρV

20.

Longitudinal stress act __________to the longitudinal axis of the shell.

(a) perpendicular

(c) either (a) or (b)

(b) parallel

(d) none of these

Page 3 of 4

21.

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

20

60

30

50

22.

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

shear stress is zero

radial stress is zero

hoop stress is zero

rending stress is zero

23.

Rate of change of bending moment is equal to

deflection

slope

rate of loading

shear force

24.

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

0.5

1

2

4

25.

Limit of proportionality depends upon

type of material

area of cross-section

type of loading

all of these

26.

Maximum principle stress theory was postulated by

Mohr

St. Venant

Tresca

Rankine

27.

Maximum shear stress theory was postulated by

Rankine

Mohr

Tresca

St Venant

28.

The method of reducing the hoop stresses in cylinders is

(a) to make its ends flat

both (a) and (b)

(b) to shrink one cylinder over the other

none of these

29.

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

30.

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

none of these

stress

strain

load

Page 4 of 4

31.

The strength of the beam mainly depends on

It's weight

CG of the section

bending beam

Section modulus

32.

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

perpendicular to the line of action of load

none of these

33.

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

1

3

9

2

34.

Working stress is always

less than ultimate stress

none of the above

equal to ultimate stress

more than ultimate stress

35.

Stress in a beam and the section modulus

are directly proportional

have curvilinear relation

have unpredictable relationship

are inversely proportional

36.

In case of over hanging beam the point of contraflexure

a) Always lies within the supports

None of these

b) Always lies in the overhanging portion

Both (a) and (b)

37.

A beam encastered at both the ends is known as

A fixed beam

Over hanging beam

Simply supported beam

A continuous beam

38.

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

Neutral axis

Middle fibre

Bottom fibre

Top fibre

39.

A continuous beam is one which has

Two supports only

Less than two supports

More than two supports

None of these

40.

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

No stress

Tensile stress

Compressive stress

Strength of Materials MCQs Set-1

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