The temperature of a wire of length 1 metre and area of cross-section $1c{m}^{2}$ is increased from 0°C to 100°C. If the rod is not allowed to increase in length, the force required will be

(a) ${10}^{3}N$                     (b) ${10}^{4}N$

(c) ${10}^{5}N$                     (d) ${10}^{9}N$

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Difficulty Level:

Two wires of copper having the length in the ratio 4 : 1 and their radii ratio as 1 : 4 are stretched by the same force. The ratio of longitudinal strain in the two will be

(a) 1 : 16                                             (b) 16 : 1

(c) 1 : 64                                             (d) 64 : 1

Concept Questions :-

Hooke's law
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Difficulty Level:

The force constant of a wire does not depend on

(a) Nature of the material                      (b) Radius of the wire

(c) Length of the wire                           (d) None of the above

Concept Questions :-

Stress-strain
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Difficulty Level:

The length of a wire is 1.0 m and the area of cross-section is $1.0×{10}^{-2}c{m}^{2}$. If the work done for increase in length by 0.2 cm is 0.4 joule, then Young's modulus of the material of the wire is

(a) $2.0×{10}^{10}N/{m}^{2}$             (b) $4×{10}^{10}N/{m}^{2}$

(c) $2.0×{10}^{11}N/{m}^{2}$             (d) $2×{10}^{10}N/{m}^{2}$

Concept Questions :-

Stress-strain
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Difficulty Level:

The quality of the material which opposes the change in shape, volume or length is called

(a)   Intermolecular repulsion

(b)   Intermolecular behaviour

(c)   Viscosity

(d)   Elasticity

Concept Questions :-

Elasticity

Difficulty Level:

For silver, Young's modulus is  and Bulk modulus is . Its Poisson's ratio will be

1. -1                                     2. 0.5

3. 0.39                                  4. 0.25

Concept Questions :-

Poisson ratio
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Difficulty Level:

A wire of length L and radius r is  rigidly fixed at one end. On stretching the other end of the wire with a force F, the increase in its length is l. If another wire of same material but of length 2L and radius 2r is stretched with a force of 2F, the increase in its length will be

(a) l                                       (b) 2l

(c) $\frac{l}{2}$                                    (d) $\frac{l}{4}$

Concept Questions :-

Hooke's law
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Difficulty Level:

In steel, the Young's modulus and the strain at the breaking point are $2×{10}^{11}N{m}^{-2}$ and 0.15 respectively. The stress at the breaking point for steel is therefore -

(a) $1.33×{10}^{11}N{m}^{-2}$           (b) $1.33×{10}^{12}N{m}^{-2}$

(c) $7.5×{10}^{-13}N{m}^{-2}$           (d) $3×{10}^{10}N{m}^{-2}$

Concept Questions :-

Hooke's law
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Which one of the following substances possesses the highest elasticity

(a) Rubber                             (b) Glass

(c) Steel                               (d) Copper

Concept Questions :-

Elasticity

Difficulty Level:

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

Concept Questions :-

Stress-strain