Strength of Materials MCQs Set-1

Page 1 of 4

1.

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

2.

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

stress

pressure

none of these

strain

3.

The point of contraflexure occurs in

Simply supported beams

Overhanging beams

All of these

Cantilevers

4.

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

decrease

increase to four times

5.

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

more

less

same

more or less depending on other factors

6.

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

Bottom fibre

Top fibre

Neutral axis

Middle fibre

7.

In case of over hanging beam the point of contraflexure

None of these

Both (a) and (b)

a) Always lies within the supports

b) Always lies in the overhanging portion

8.

Rate of change of bending moment is equal to

rate of loading

deflection

shear force

slope

9.

Limit of proportionality depends upon

area of cross-section

all of these

type of material

type of loading

10.

________theory is suitable for brittle material.

Maximum strain energy

Distortion energy theory

Maximum shear stress theory

Maximum principle stress theory

Page 2 of 4

11.

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

1/2 ρV²

ρV

1/2 ρV³

ρV²

12.

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

Shear stress

Compressive stress

Tensile stress

13.

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

14.

A cantilever is a beam whose

Both ends are free

One end is fixed and other free

Both ends are fixed

None of these

15.

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

16.

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

Working strength and density

Ultimate strength and density

None of these

Ultimate strength and safety

17.

Working stress is always

less than ultimate stress

equal to ultimate stress

more than ultimate stress

none of the above

18.

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

hoop stress is zero

shear stress is zero

rending stress is zero

radial stress is zero

19.

Longitudinal stress act __________to the longitudinal axis of the shell.

(a) perpendicular

(b) parallel

(d) none of these

(c) either (a) or (b)

20.

Shear stress on principal planes is

maximum

zero

minimum

none of these

Page 3 of 4

21.

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

0.5

1

2

4

22.

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

Rectangular

Triangular

Parabolic

None of these

23.

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

1

2

9

3

24.

A continuous beam is one which has

Less than two supports

Two supports only

More than two supports

None of these

25.

A beam encastered at both the ends is known as

Over hanging beam

Simply supported beam

A fixed beam

A continuous beam

26.

The strength of the beam mainly depends on

CG of the section

Section modulus

bending beam

It's weight

27.

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

the sum of the normal stresses

half the sum of normal stresses

28.

The principle stresses are

parallel to the principle planes

normal to the principle planes

inclined to the principle planes

none of the above

29.

Simple stress is often called

direct stress

none of these

total stress

transverse stress

30.

Maximum shear stress theory was postulated by

Mohr

Tresca

St Venant

Rankine

Page 4 of 4

31.

Modulus of rigidity is defined as the ratio of

longitudinal stress to longitudinal strain

stress to volumetric strain

stress to strain

shear stress to shear strain

32.

Stress in a beam and the section modulus

are inversely proportional

are directly proportional

have curvilinear relation

have unpredictable relationship

33.

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

endurance

none of these

fatigue

creep

34.

Which of the following theories is suitable for ductile material?

Maximum shear stress theory

Maximum principle strain theory

none of the above

Maximum principle stress theory

35.

Maximum principle stress theory was postulated by

Rankine

Tresca

St. Venant

Mohr

36.

Maximum bending moment in a beam occurs where

shear force changes sign

shear force is minimum

deflection is zero

shear force is maximum

37.

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

stress

load

none of these

strain

38.

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

homogeneous

elastic

orthotropic

isotropic

39.

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

40.

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

Infinity

Maximum

Minimum

Zero

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