Mechanical Properties of Solids Test

Result

Mechanical Properties of Solids Test - 22

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Weekly Quiz Competition

Question 1
4 / -1

A wire of length 2 m is made from 10 cm³ of copper. A force F is applied so that its length increased by 2 mm. Another wire of length 8 m is made from the same volume of copper. If the force F is applied to it, its length will increase by

A
0.8 cm

B
1.6 cm

C
2.4 cm

D
3.2 cm

Solution
Question 2
4 / -1

Which of the following statements is correct?

A
Hooke's law is applicable only within elastic limit

B
The adiabatic and isothermal elastic constants of a gas are equal

C
Young's modulus is dimensionless

D
Stress multiplied by strain is equal to the stored energy
Question 3
4 / -1

The force required to stretch a steel wire of 1 cm² cross- section to 1.1 times its length would be (Y = 2 × 10¹¹ Nm^–2)

A
2 × 10⁶ N

B
2 × 10³ N

C
2 × 10^–6 N

D
2 × 10^–7 N

Solution
Question 4
4 / -1

Which one of the following substances possesses the highest elasticity?

A
Rubber

B
Glass

C
Steel

D
Copper
Question 5
4 / -1

Which one of the following quantities does not have the unit of force per unit area?

A
Stress

B
Strain

C
Young's modulus of elasticity

D
Pressure
Question 6
4 / -1

A copper wire and a steel wire of the same diameter and length are connected end to end and a force is applied, which stretches their combined length by 1 cm. The two wires will have

A
Different stresses and strains

B
The same stress and strain

C
The same strain but different stresses

D
The same stress but different strains

Solution
Question 7
4 / -1

A steel ring of radius r and cross-section area \'A\' is fitted on to a wooden disc of radius R(R > r). If Young\'s modulus be E, then the force with which the steel ring is expanded is

A

B

C

D

Solution
Question 8
4 / -1

According to Hooke\'s law force is proportional to

A

B

C

D
Question 9
4 / -1

Two wires of the same material have lengths in the ratio 1 : 2 and their radii are in the ratio 1: √2. If they are stretched by applying equal forces, the increase in their lengths will be in the ratio

A
2 : √2

B
√2 : 2

C
1 : 1

D
1 : 2

Solution
Question 10
4 / -1

When a weight of 10 kg is suspended from a copper wire of length 3 m and diameter 0.4 mm, its length increases by 2.4 cm. If the diameter of the wire is doubled, then the extension in its length will be

A
9.6 cm

B
4.8 cm

C
1.2 cm

D
0.6 cm

Solution