Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 12 - Elasticity>Objective Problems>Q 8

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A material has Poisson's ratio $0.50$ . If a uniform rod of it suffers a longitudinal strain of $2 \times 10^{- 3}$ , then the percentage change in volume is

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Important Questions on Elasticity

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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 12 - Elasticity>Objective Problems>Q 9

A

0.1 kg

mass is suspended from a wire of negligible mass. The length of the wire is

1 m

and its cross-sectional area is

4.9 \times 10^{- 7} m^{2}

. If the mass is pulled a little in the vertically downward direction and released, it performs a simple harmonic motion of angular frequency

140 rad s^{- 1}

. If Young's modulus of the material of the wire is

n \times 10^{9} N m^{- 2}

, the value of

n

is

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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 12 - Elasticity>Objective Problems>Q 10

Two wires are made of the same material and have the same volume. However, wire

1

has cross-sectional area

A

and wire

2

has cross-sectional area

3 A

. If the length of the wire

1

increases by

Δ x

on applying force

F

, how much force is needed to stretch wire

2

by the same amount?

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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 12 - Elasticity>Objective Problems>Q 11

Which of the following substances has the highest elasticity?

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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 12 - Elasticity>Objective Problems>Q 12

There is no change in the volume of a wire due to the change in its length on stretching. The Poisson's ratio of the material of the wire is

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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 12 - Elasticity>Objective Problems>Q 13

The increase in pressure required to decrease the

200 L

volume of a liquid by

0.008 L

in

kPa

is (bulk modulus of the liquid

= 2100 MPa

)

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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 12 - Elasticity>Objective Problems>Q 14

Four wires of the same material are stretched by the same load. Which one of them will elongate most if their dimensions are as follows?

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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 12 - Elasticity>Objective Problems>Q 15

Which of the following relations is true?

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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 12 - Elasticity>Objective Problems>Q 16

For a given material, the Young's modulus is

2.4

times that of the rigidity modulus. Its Poisson's ratio is