Strength of Materials MCQs Set-1

Page 1 of 4

1.

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

Over hanging beam

Simply supported beam

None of these

Cantilever beam

2.

Rate of change of bending moment is equal to

rate of loading

shear force

deflection

slope

3.

Modulus of rigidity is defined as the ratio of

shear stress to shear strain

longitudinal stress to longitudinal strain

stress to strain

stress to volumetric strain

4.

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

Rectangular

Triangular

None of these

Parabolic

5.

Working stress is always

equal to ultimate stress

none of the above

less than ultimate stress

more than ultimate stress

6.

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

7.

The principle stresses are

inclined to the principle planes

normal to the principle planes

none of the above

parallel to the principle planes

8.

Stress in a beam and the section modulus

have curvilinear relation

have unpredictable relationship

are directly proportional

are inversely proportional

9.

Simple stress is often called

total stress

transverse stress

direct stress

none of these

10.

Maximum principle stress theory was postulated by

Mohr

Tresca

Rankine

St. Venant

Page 2 of 4

11.

A cantilever is a beam whose

Both ends are fixed

None of these

One end is fixed and other free

Both ends are free

12.

Which of the following theories is suitable for ductile material?

Maximum principle strain theory

Maximum principle stress theory

Maximum shear stress theory

none of the above

13.

The strength of the beam mainly depends on

It's weight

Section modulus

CG of the section

bending beam

14.

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

Tensile stress

Compressive stress

Shear stress

15.

The point of contraflexure occurs in

Cantilevers

Overhanging beams

Simply supported beams

All of these

16.

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

1

3

9

2

17.

Shear stress on principal planes is

none of these

maximum

minimum

zero

18.

The method of reducing the hoop stresses in cylinders is

none of these

(a) to make its ends flat

(b) to shrink one cylinder over the other

both (a) and (b)

19.

________theory is suitable for brittle material.

Maximum principle stress theory

Maximum shear stress theory

Maximum strain energy

Distortion energy theory

20.

A beam encastered at both the ends is known as

A continuous beam

A fixed beam

Simply supported beam

Over hanging beam

Page 3 of 4

21.

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

Top fibre

Middle fibre

Bottom fibre

Neutral axis

22.

Longitudinal stress act __________to the longitudinal axis of the shell.

(b) parallel

(c) either (a) or (b)

(d) none of these

(a) perpendicular

23.

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

24.

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

creep

none of these

endurance

fatigue

25.

Maximum shear stress theory was postulated by

Tresca

Mohr

Rankine

St Venant

26.

Maximum bending moment in a beam occurs where

shear force is minimum

deflection is zero

shear force changes sign

shear force is maximum

27.

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

28.

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

radial stress is zero

hoop stress is zero

shear stress is zero

rending stress is zero

29.

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

2

1

0.5

4

30.

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

elastic

orthotropic

isotropic

homogeneous

Page 4 of 4

31.

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

Maximum

Zero

Infinity

Minimum

32.

The maximum stress in a ring under tension occurs

along the line of action of load

at 45 degree with the line of action of load

none of these

perpendicular to the line of action of load

33.

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

34.

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

same

more

less

more or less depending on other factors

35.

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

none of these

stress

strain

pressure

36.

Limit of proportionality depends upon

type of material

type of loading

all of these

area of cross-section

37.

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

increase to four times

decrease

remain unchanged

increase to two times

38.

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

stress

load

none of these

strain

39.

A continuous beam is one which has

More than two supports

Less than two supports

None of these

Two supports only

40.

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

Strength of Materials MCQs Set-1

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