Strength of Materials MCQs Set-1

Page 1 of 4

1.

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

same

more or less depending on other factors

less

more

2.

A beam encastered at both the ends is known as

A fixed beam

Simply supported beam

A continuous beam

Over hanging beam

3.

Longitudinal stress act __________to the longitudinal axis of the shell.

(c) either (a) or (b)

(d) none of these

(b) parallel

(a) perpendicular

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?

No stress

Shear stress

Compressive stress

Tensile stress

5.

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

4

1

0.5

2

6.

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

Top fibre

Neutral axis

Middle fibre

Bottom fibre

7.

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

radial stress is zero

rending stress is zero

hoop stress is zero

shear stress is zero

8.

Simple stress is often called

none of these

direct stress

transverse stress

total stress

9.

The method of reducing the hoop stresses in cylinders is

(a) to make its ends flat

none of these

both (a) and (b)

(b) to shrink one cylinder over the other

10.

A cantilever is a beam whose

None of these

Both ends are fixed

Both ends are free

One end is fixed and other free

Page 2 of 4

11.

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

Infinity

Zero

Maximum

Minimum

12.

Modulus of rigidity is defined as the ratio of

stress to volumetric strain

longitudinal stress to longitudinal strain

shear stress to shear strain

stress to strain

13.

Maximum shear stress theory was postulated by

Tresca

Rankine

St Venant

Mohr

14.

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

none of these

load

stress

strain

15.

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

16.

Rate of change of bending moment is equal to

slope

rate of loading

shear force

deflection

17.

Limit of proportionality depends upon

area of cross-section

type of material

type of loading

all of these

18.

Which of the following theories is suitable for ductile material?

none of the above

Maximum principle strain theory

Maximum principle stress theory

Maximum shear stress theory

19.

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

20.

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

Parabolic

Triangular

Rectangular

None of these

Page 3 of 4

21.

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

increase to four times

decrease

remain unchanged

22.

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

the sum of the normal stresses

half the difference of normal stresses

the difference of normal stresses

half the sum of normal stresses

23.

Shear stress on principal planes is

maximum

none of these

zero

minimum

24.

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

25.

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

pressure

stress

none of these

strain

26.

Maximum principle stress theory was postulated by

Rankine

Tresca

Mohr

St. Venant

27.

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

perpendicular to the line of action of load

none of these

28.

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

creep

endurance

fatigue

none of these

29.

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

60

30

30.

The strength of the beam mainly depends on

bending beam

CG of the section

It's weight

Section modulus

Page 4 of 4

31.

Maximum bending moment in a beam occurs where

shear force is maximum

deflection is zero

shear force changes sign

shear force is minimum

32.

Stress in a beam and the section modulus

have unpredictable relationship

have curvilinear relation

are inversely proportional

are directly proportional

33.

A continuous beam is one which has

More than two supports

None of these

Less than two supports

Two supports only

34.

Working stress is always

less than ultimate stress

none of the above

equal to ultimate stress

more than ultimate stress

35.

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

9

2

1

3

36.

The point of contraflexure occurs in

Overhanging beams

Simply supported beams

Cantilevers

All of these

37.

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

elastic

homogeneous

isotropic

orthotropic

38.

The principle stresses are

inclined to the principle planes

normal to the principle planes

parallel to the principle planes

none of the above

39.

________theory is suitable for brittle material.

Distortion energy theory

Maximum shear stress theory

Maximum principle stress theory

Maximum strain energy

40.

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

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