Strength of Materials MCQs Set-1

Page 1 of 4

1.

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

Neutral axis

Bottom fibre

Top fibre

Middle fibre

2.

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

None of these

Rectangular

Triangular

Parabolic

3.

Which of the following theories is suitable for ductile material?

Maximum principle stress theory

Maximum shear stress theory

Maximum principle strain theory

none of the above

4.

A continuous beam is one which has

Two supports only

More than two supports

None of these

Less than two supports

5.

Maximum bending moment in a beam occurs where

shear force changes sign

deflection is zero

shear force is maximum

shear force is minimum

6.

A beam encastered at both the ends is known as

Simply supported beam

A continuous beam

A fixed beam

Over hanging beam

7.

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

radial stress is zero

hoop stress is zero

rending stress is zero

shear stress is zero

8.

The strength of the beam mainly depends on

It's weight

bending beam

CG of the section

Section modulus

9.

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

isotropic

orthotropic

elastic

homogeneous

10.

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

Infinity

Zero

Minimum

Maximum

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11.

Limit of proportionality depends upon

type of loading

area of cross-section

all of these

type of material

12.

Maximum shear stress theory was postulated by

St Venant

Mohr

Tresca

Rankine

13.

________theory is suitable for brittle material.

Distortion energy theory

Maximum strain energy

Maximum principle stress theory

Maximum shear stress theory

14.

The maximum stress in a ring under tension occurs

none of these

along the line of action of load

at 45 degree with the line of action of load

perpendicular to the line of action of load

15.

Rate of change of bending moment is equal to

shear force

slope

deflection

rate of loading

16.

Longitudinal stress act __________to the longitudinal axis of the shell.

(b) parallel

(c) either (a) or (b)

(d) none of these

(a) perpendicular

17.

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

Compressive stress

Tensile stress

18.

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

30

20

19.

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

2

9

3

1

20.

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

the difference of normal stresses

half the sum of normal stresses

half the difference of normal stresses

the sum of the normal stresses

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21.

The principle stresses are

none of the above

normal to the principle planes

inclined to the principle planes

parallel to the principle planes

22.

Working stress is always

less than ultimate stress

more than ultimate stress

none of the above

equal to ultimate stress

23.

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

ρV

ρV²

1/2 ρV²

1/2 ρV³

24.

Simple stress is often called

direct stress

total stress

none of these

transverse stress

25.

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

remain unchanged

increase to four times

increase to two times

decrease

26.

Shear stress on principal planes is

zero

minimum

none of these

maximum

27.

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

strain

none of these

load

stress

28.

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

stress

none of these

strain

pressure

29.

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

Over hanging beam

Simply supported beam

Cantilever beam

None of these

30.

Stress in a beam and the section modulus

are inversely proportional

have unpredictable relationship

are directly proportional

have curvilinear relation

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31.

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

less

same

more or less depending on other factors

more

32.

Maximum principle stress theory was postulated by

Mohr

St. Venant

Tresca

Rankine

33.

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

none of these

fatigue

creep

endurance

34.

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

2

4

1

0.5

35.

A cantilever is a beam whose

Both ends are fixed

None of these

Both ends are free

One end is fixed and other free

36.

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

Working strength and density

None of these

Ultimate strength and safety

Ultimate strength and density

37.

Modulus of rigidity is defined as the ratio of

stress to strain

shear stress to shear strain

stress to volumetric strain

longitudinal stress to longitudinal strain

38.

The method of reducing the hoop stresses in cylinders is

(b) to shrink one cylinder over the other

both (a) and (b)

(a) to make its ends flat

none of these

39.

The point of contraflexure occurs in

Simply supported beams

All of these

Cantilevers

Overhanging beams

40.

In case of over hanging beam the point of contraflexure

b) Always lies in the overhanging portion

Both (a) and (b)

None of these

a) Always lies within the supports

Strength of Materials MCQs Set-1

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