A Text Book of PHYSICS PART I : CLASS 11>Chapter 12 - Elasticity>EXERCISE>Q 38

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11th West Bengal Board

IMPORTANT

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The load versus elongation graph for four wires of the same material is shown in Fig. The thinnest wire is represented by the line.

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Important Questions on Elasticity

MEDIUM

11th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART I : CLASS 11>Chapter 12 - Elasticity>EXERCISE>Q 39

Assertion (A): Ductile metals are used to prepare thin wires.

Reason (R) : Jn the stress-strain curve of ductile metals, the length between the points representing elastic limit and breaking point is very small.

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11th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART I : CLASS 11>Chapter 12 - Elasticity>EXERCISE>Q 40

A wire of initial length

L

and radius

r

is stretched by a length

l

. Another wire of the same material but with initial length

2 L

and radius

2 r

is stretched by a length

2 l

. The ratio of the stored energy per unit volume in the first and second wire is

MEDIUM

11th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART I : CLASS 11>Chapter 12 - Elasticity>EXERCISE>Q 41

One end of a horizontal thick copper wire of length

2 L

and radius

2 R

is welded to an end of another horizontal thin copper wire of length

L

and radius

R

. When the arrangement is stretched by applying forces at two ends, the ratio of the elongation in the thin wire to that in the thick wire is

HARD

11th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART I : CLASS 11>Chapter 12 - Elasticity>EXERCISE>Q 42

A solid sphere of radius

R

And density

ρ

Is attached to one end of a massless spring of force constant

k

. The other end of the spring is connected to another solid sphere of radius

R

And density

3 ρ

. The complete arrangement is placed in a liquid of density

2 p

And is allowed to reach equilibrium. The correct statement is (are).

HARD

11th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART I : CLASS 11>Chapter 12 - Elasticity>EXERCISE>Q 43

The length of a metal wire is

L_{1}

when the tension is

T_{1}

and

L_{2}

when the tension is

T_{2}

. The unstretched length of the wire is