Strength of Materials MCQs Set-1

Page 1 of 4

1.

In case of over hanging beam the point of contraflexure

Both (a) and (b)

b) Always lies in the overhanging portion

None of these

a) Always lies within the supports

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?

Compressive stress

No stress

Shear stress

Tensile stress

3.

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

stress

load

strain

none of these

4.

A cantilever is a beam whose

None of these

Both ends are fixed

One end is fixed and other free

Both ends are free

5.

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

increase to four times

decrease

6.

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

30

60

50

20

7.

Working stress is always

equal to ultimate stress

less than ultimate stress

more than ultimate stress

none of the above

8.

The strength of the beam mainly depends on

Section modulus

It's weight

bending beam

CG of the section

9.

Which of the following theories is suitable for ductile material?

Maximum principle strain theory

Maximum shear stress theory

Maximum principle stress theory

none of the above

10.

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

None of these

Over hanging beam

Cantilever beam

Simply supported beam

Page 2 of 4

11.

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

orthotropic

homogeneous

elastic

isotropic

12.

The method of reducing the hoop stresses in cylinders is

both (a) and (b)

(a) to make its ends flat

(b) to shrink one cylinder over the other

none of these

13.

A continuous beam is one which has

Less than two supports

Two supports only

More than two supports

None of these

14.

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

1/2 ρV²

ρV²

ρV

1/2 ρV³

15.

Simple stress is often called

none of these

transverse stress

direct stress

total stress

16.

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

none of these

pressure

stress

strain

17.

Maximum bending moment in a beam occurs where

deflection is zero

shear force is minimum

shear force is maximum

shear force changes sign

18.

The maximum stress in a ring under tension occurs

perpendicular to the line of action of load

along the line of action of load

none of these

at 45 degree with the line of action of load

19.

________theory is suitable for brittle material.

Distortion energy theory

Maximum strain energy

Maximum principle stress theory

Maximum shear stress theory

20.

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

Page 3 of 4

21.

Maximum principle stress theory was postulated by

St. Venant

Rankine

Mohr

Tresca

22.

A beam encastered at both the ends is known as

A continuous beam

Over hanging beam

A fixed beam

Simply supported beam

23.

The point of contraflexure occurs in

Overhanging beams

Simply supported beams

Cantilevers

All of these

24.

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

1

2

3

9

25.

Longitudinal stress act __________to the longitudinal axis of the shell.

(c) either (a) or (b)

(a) perpendicular

(d) none of these

(b) parallel

26.

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

Working strength and density

Ultimate strength and safety

None of these

Ultimate strength and density

27.

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

more or less depending on other factors

more

less

same

28.

Maximum shear stress theory was postulated by

Tresca

Rankine

St Venant

Mohr

29.

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

rending stress is zero

hoop stress is zero

radial stress is zero

shear stress is zero

30.

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

Middle fibre

Neutral axis

Top fibre

Bottom fibre

Page 4 of 4

31.

Shear stress on principal planes is

none of these

maximum

minimum

zero

32.

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

endurance

fatigue

creep

none of these

33.

Limit of proportionality depends upon

type of loading

area of cross-section

type of material

all of these

34.

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

4

1

0.5

2

35.

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

Minimum

Infinity

Maximum

Zero

36.

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

the difference of normal stresses

half the difference of normal stresses

half the sum of normal stresses

the sum of the normal stresses

37.

Rate of change of bending moment is equal to

shear force

rate of loading

deflection

slope

38.

Stress in a beam and the section modulus

have curvilinear relation

are directly proportional

have unpredictable relationship

are inversely proportional

39.

The principle stresses are

normal to the principle planes

none of the above

parallel to the principle planes

inclined to the principle planes

40.

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

Parabolic

Rectangular

None of these

Triangular

Strength of Materials MCQs Set-1

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