Strength of Materials MCQs Set-1

Page 1 of 4

1.

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)

2.

Stress in a beam and the section modulus

are inversely proportional

have unpredictable relationship

have curvilinear relation

are directly proportional

3.

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

None of these

Simply supported beam

Over hanging beam

Cantilever beam

4.

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

Shear stress

No stress

Tensile stress

5.

Maximum bending moment in a beam occurs where

shear force changes sign

shear force is minimum

shear force is maximum

deflection is zero

6.

Longitudinal stress act __________to the longitudinal axis of the shell.

(d) none of these

(c) either (a) or (b)

(b) parallel

(a) perpendicular

7.

Modulus of rigidity is defined as the ratio of

shear stress to shear strain

stress to volumetric strain

longitudinal stress to longitudinal strain

stress to strain

8.

Rate of change of bending moment is equal to

rate of loading

shear force

slope

deflection

9.

The strength of the beam mainly depends on

CG of the section

bending beam

It's weight

Section modulus

10.

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

30

50

20

Page 2 of 4

11.

In case of over hanging beam the point of contraflexure

None of these

a) Always lies within the supports

Both (a) and (b)

b) Always lies in the overhanging portion

12.

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

hoop stress is zero

radial stress is zero

shear stress is zero

rending stress is zero

13.

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

less

more

same

more or less depending on other factors

14.

Simple stress is often called

transverse stress

direct stress

none of these

total stress

15.

Limit of proportionality depends upon

area of cross-section

all of these

type of material

type of loading

16.

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

none of these

stress

pressure

strain

17.

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

18.

Maximum shear stress theory was postulated by

Tresca

Rankine

St Venant

Mohr

19.

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

the sum of the normal stresses

half the difference of normal stresses

20.

A cantilever is a beam whose

None of these

Both ends are free

Both ends are fixed

One end is fixed and other free

Page 3 of 4

21.

A continuous beam is one which has

Less than two supports

More than two supports

Two supports only

None of these

22.

Working stress is always

equal to ultimate stress

less than ultimate stress

none of the above

more than ultimate stress

23.

The maximum stress in a ring under tension occurs

perpendicular to the line of action of load

none of these

along the line of action of load

at 45 degree with the line of action of load

24.

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

Maximum

Minimum

Infinity

Zero

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

maximum

none of these

27.

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

Rectangular

Triangular

Parabolic

None of these

28.

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

isotropic

orthotropic

homogeneous

elastic

29.

The principle stresses are

parallel to the principle planes

inclined to the principle planes

none of the above

normal to the principle planes

30.

________theory is suitable for brittle material.

Maximum strain energy

Distortion energy theory

Maximum shear stress theory

Maximum principle stress theory

Page 4 of 4

31.

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

1

4

0.5

2

32.

A beam encastered at both the ends is known as

Over hanging beam

Simply supported beam

A continuous beam

A fixed beam

33.

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

1

3

9

2

34.

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

endurance

fatigue

none of these

creep

35.

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

Top fibre

Bottom fibre

Neutral axis

Middle fibre

36.

Which of the following theories is suitable for ductile material?

Maximum shear stress theory

Maximum principle strain theory

Maximum principle stress theory

none of the above

37.

Maximum principle stress theory was postulated by

Tresca

St. Venant

Rankine

Mohr

38.

The point of contraflexure occurs in

Overhanging beams

All of these

Simply supported beams

Cantilevers

39.

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

1/2 ρV³

ρV

1/2 ρV²

ρV²

40.

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

strain

none of these

load

stress

Strength of Materials MCQs Set-1

Related

Leave a ReplyCancel reply

Secured Payments

Protection

Strength of Materials MCQs Set-1

Share this Now with Friends:

Related

Leave a ReplyCancel reply

Secured Payments

Protection