Strength of Materials MCQs Set-1

Page 1 of 4

1.

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

Parabolic

Rectangular

Triangular

None of these

2.

Longitudinal stress act __________to the longitudinal axis of the shell.

(d) none of these

(a) perpendicular

(c) either (a) or (b)

(b) parallel

3.

The principle stresses are

parallel to the principle planes

none of the above

normal to the principle planes

inclined to the principle planes

4.

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

Zero

Maximum

Minimum

Infinity

5.

A cantilever is a beam whose

One end is fixed and other free

None of these

Both ends are free

Both ends are fixed

6.

Shear stress on principal planes is

minimum

maximum

zero

none of these

7.

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

None of these

Cantilever beam

Over hanging beam

Simply supported beam

8.

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

endurance

creep

fatigue

none of these

9.

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

Ultimate strength and safety

None of these

Working strength and density

Ultimate strength and density

10.

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

Tensile stress

Shear stress

Page 2 of 4

11.

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

12.

Working stress is always

equal to ultimate stress

less than ultimate stress

more than ultimate stress

none of the above

13.

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

orthotropic

elastic

homogeneous

isotropic

14.

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

20

30

60

15.

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

more or less depending on other factors

more

same

less

16.

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

Top fibre

Bottom fibre

Neutral axis

Middle fibre

17.

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

strain

none of these

pressure

stress

18.

Maximum bending moment in a beam occurs where

shear force changes sign

shear force is maximum

shear force is minimum

deflection is zero

19.

Limit of proportionality depends upon

type of loading

area of cross-section

all of these

type of material

20.

________theory is suitable for brittle material.

Maximum shear stress theory

Distortion energy theory

Maximum principle stress theory

Maximum strain energy

Page 3 of 4

21.

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

1/2 ρV³

ρV

ρV²

1/2 ρV²

22.

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

half the sum of normal stresses

half the difference of normal stresses

the sum of the normal stresses

the difference of normal stresses

23.

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

1

9

3

2

24.

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

25.

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

decrease

remain unchanged

increase to four times

26.

Rate of change of bending moment is equal to

shear force

rate of loading

slope

deflection

27.

Maximum shear stress theory was postulated by

Rankine

St Venant

Tresca

Mohr

28.

A beam encastered at both the ends is known as

A fixed beam

Over hanging beam

A continuous beam

Simply supported beam

29.

Which of the following theories is suitable for ductile material?

Maximum shear stress theory

Maximum principle stress theory

none of the above

Maximum principle strain theory

30.

The method of reducing the hoop stresses in cylinders is

both (a) and (b)

(b) to shrink one cylinder over the other

(a) to make its ends flat

none of these

Page 4 of 4

31.

Stress in a beam and the section modulus

have curvilinear relation

are directly proportional

have unpredictable relationship

are inversely proportional

32.

The point of contraflexure occurs in

Cantilevers

All of these

Simply supported beams

Overhanging beams

33.

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

4

1

0.5

2

34.

The strength of the beam mainly depends on

It's weight

Section modulus

bending beam

CG of the section

35.

The maximum stress in a ring under tension occurs

perpendicular to the line of action of load

at 45 degree with the line of action of load

along the line of action of load

none of these

36.

Maximum principle stress theory was postulated by

Rankine

Mohr

St. Venant

Tresca

37.

Modulus of rigidity is defined as the ratio of

shear stress to shear strain

longitudinal stress to longitudinal strain

stress to volumetric strain

stress to strain

38.

A continuous beam is one which has

Less than two supports

None of these

Two supports only

More than two supports

39.

Simple stress is often called

transverse stress

total stress

direct stress

none of these

40.

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

load

strain

none of these

stress

Strength of Materials MCQs Set-1

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