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Mechanics of Materials Quiz unit 1

Total questions: 30

Worksheet time: 15mins

Name
Class
Date
1.

The SI unit of stress is:

a)

Pascal

b)

Newton

c)

Meter

d)

Kilogram

2.

The ratio of lateral strain to longitudinal strain is called

a)

Young’s modulus

b)

Poisson’s ratio

c)

Bulk modulus

d)

Rigidity modulus

3.

A rod of length 2 m is stretched by 1 mm. The strain produced is:

a)

0.0005

b)

0.001

c)

0.005

d)

0.05

4.

Stress is defined as the force acting per unit

a)

Length

b)

Cross-sectional area

c)

Volume

d)

Weight

5.

If a force of 2000 N acts on an area of 20 mm², the stress induced (in MPa) is

a)

10

b)

100

c)

1

d)

0.1

6.

The elastic limit is the point beyond which

a)

Permanent deformation starts

b)

Material breaks

c)

Stress is zero

d)

Strain is zero

7.

The modulus of rigidity is related to

a)

Volumetric strain

b)

Shear strain

c)

Longitudinal strain

d)

Lateral strain

8.

Which of these forces causes elongation in a material?

a)

Shear force

b)

Compressional force

c)

Tensile force

d)

Bending force

9.

Shear stress acts:

a)

Perpendicular to the surface

b)

Parallel to the surface

c)

Both perpendicular and parallel

d)

None of these

10.

The ratio of stress to strain in the elastic range is

a)

Modulus of elasticity

b)

Poisson's ratio

c)

Modulus of rigidity

d)

Bulk modulus

11.

If the cross-sectional area of a rod is doubled for the same force, the stress will

a)

Double

b)

Halve

c)

Remain same

d)

Become zero

12.

The change in length divided by original length is called

a)

Stress

b)

Strain

c)

Load

d)

Force

13.

The phenomenon by which a material regains its original shape when stress is removed is called

a)

Plasticity

b)

Elasticity

c)

Ductility

d)

Toughness

14.

Which mechanical property indicates the ability of a material to absorb energy before fracture?

a)

Toughness

b)

Ductility

c)

Brittleness

d)

Hardness

15.

The unit of young’s modulus is

a)

Pascal

b)

Newton

c)

Pascal per meter

d)

Newton meter

16.

Percentage elongation is a measure of:

a)

Elasticity

b)

Plasticity

c)

Ductility

d)

Hardness

17.

Which of the following represents shear strain

a)

Change in length/original length

b)

Angle of distortion in radians

c)

Lateral strain

d)

Volumetric strain

18.

The elastic constants are:

a)

Young’s modulus and Bulk modulus only

b)

Young’s modulus, Bulk modulus, Modulus of rigidity

c)

Poisson’s ratio only

d)

None of the above

19.

Yield point marks the

a)

Elastic limit

b)

Beginning of plastic deformation

c)

Ultimate strength

d)

Fracture point

20.

The factor of safety is defined as the ratio of:

a)

Ultimate stress to actual working stress

b)

Working stress to ultimate stress

c)

Yield stress to fracture stress

d)

Breaking load to elastic limit

21.

Volumetric strain occurs due to:

a)

Shear forces

b)

Tensile forces

c)

Change in volume

d)

Change in length

22.

The lateral strain of a rod is 0.0004 and longitudinal strain is 0.002. Poisson’s ratio is

a)

0.2

b)

0.4

c)

0.5

d)

0.6

23.

Select correct expression between E,G & 1/m

a)

E = 3G (1 - 2 * 1/m)

b)

E=2G (1 - 2 * 1/m)

c)

E = 2G[1 - 1/m]

d)

E = 2G [1 + 1/m]

24.

Select correct expression between E,G & K

a)

E= (3K+G)/9KG

b)

E= (9KG)/(3K+G)

c)

E= (3K-G)/9KG

d)

E= (9KG)/(3K-G)

25.

What is the unit of poisson’s ratio

a)

N/mm²

b)

N/mm

c)

N/cm²

d)

No unit

26.

The value of Young's Modulus of steel

a)

1.1x10^{5}N/mm^{2}

b)

2.1x10^{5}N/mm^{2}

c)

3.1x10^{5}N/mm^{2}

d)

4.1x 10^{5}N/mm^{2}

27.

The property of a material which it undergoes and change in shape without rapture under compressive load is called:

a)

Compressibility

b)

Ductility

c)

Malleability

d)

Tenacity

28.

The product of the force and the perpendicular distance between the line of action of the force is mathematically equal to:

a)

Moment of force

b)

Tensile force

c)

Shear force

d)

Compression

29.

The resistance of a material against wear, indentation, scratching and abreaction etc. is called:

a)

Elasticity

b)

Rigidity

c)

Hardness

d)

Toughness

30.

The strain produced due to the axial stress in the longitudinal direction is called:

a)

Linear Strain

b)

Lateral Strain

c)

Shear Strain

d)

Volumetric Strain