Strength of Materials MCQs Set-1

Page 1 of 4

1.

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

Middle fibre

Neutral axis

Top fibre

Bottom fibre

2.

The principle stresses are

normal to the principle planes

none of the above

inclined to the principle planes

parallel to the principle planes

3.

________theory is suitable for brittle material.

Maximum shear stress theory

Distortion energy theory

Maximum strain energy

Maximum principle stress theory

4.

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

none of these

stress

pressure

strain

5.

In case of over hanging beam the point of contraflexure

a) Always lies within the supports

b) Always lies in the overhanging portion

None of these

Both (a) and (b)

6.

Maximum bending moment in a beam occurs where

shear force is maximum

shear force is minimum

shear force changes sign

deflection is zero

7.

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

load

stress

none of these

strain

8.

Modulus of rigidity is defined as the ratio of

stress to volumetric strain

longitudinal stress to longitudinal strain

stress to strain

shear stress to shear strain

9.

Limit of proportionality depends upon

type of loading

all of these

area of cross-section

type of material

10.

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

Page 2 of 4

11.

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

1/2 ρV³

ρV²

ρV

1/2 ρV²

12.

Shear stress on principal planes is

minimum

none of these

zero

maximum

13.

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

Zero

Maximum

Infinity

Minimum

14.

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

Rectangular

Triangular

None of these

Parabolic

15.

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

orthotropic

elastic

isotropic

homogeneous

16.

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

more

less

same

more or less depending on other factors

17.

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

decrease

increase to four times

remain unchanged

increase to two times

18.

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

2

0.5

4

1

19.

Maximum principle stress theory was postulated by

Rankine

Tresca

Mohr

St. Venant

20.

Simple stress is often called

total stress

transverse stress

none of these

direct stress

Page 3 of 4

21.

A cantilever is a beam whose

Both ends are free

Both ends are fixed

None of these

One end is fixed and other free

22.

A continuous beam is one which has

None of these

Two supports only

More than two supports

Less than two supports

23.

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

endurance

creep

fatigue

none of these

24.

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

30

60

20

25.

A beam encastered at both the ends is known as

A fixed beam

A continuous beam

Simply supported beam

Over hanging beam

26.

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

shear stress is zero

hoop stress is zero

radial stress is zero

rending stress is zero

27.

The maximum stress in a ring under tension occurs

none of these

at 45 degree with the line of action of load

along the line of action of load

perpendicular to the line of action of load

28.

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

3

9

2

1

29.

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

Cantilever beam

Over hanging beam

None of these

Simply supported beam

30.

Rate of change of bending moment is equal to

slope

rate of loading

deflection

shear force

Page 4 of 4

31.

Stress in a beam and the section modulus

are inversely proportional

are directly proportional

have unpredictable relationship

have curvilinear relation

32.

The strength of the beam mainly depends on

It's weight

CG of the section

bending beam

Section modulus

33.

The point of contraflexure occurs in

Simply supported beams

Cantilevers

All of these

Overhanging beams

34.

Longitudinal stress act __________to the longitudinal axis of the shell.

(d) none of these

(b) parallel

(a) perpendicular

(c) either (a) or (b)

35.

Maximum shear stress theory was postulated by

Rankine

St Venant

Tresca

Mohr

36.

Working stress is always

less than ultimate stress

equal to ultimate stress

more than ultimate stress

none of the above

37.

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

Tensile stress

Compressive stress

No stress

38.

The method of reducing the hoop stresses in cylinders is

(b) to shrink one cylinder over the other

none of these

(a) to make its ends flat

both (a) and (b)

39.

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 difference of normal stresses

the sum of the normal stresses

40.

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

Working strength and density

Ultimate strength and safety

None of these

Ultimate strength and density

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