Elasticity - CBSE STD 12 Science JEE physics Questions

Assertion : Sterss is the internal force per unit area of a body.
Reason : Rubber is less elastic than steel.

Assertion : Identical springs of steel and copper are equally stretched. More work will be done on the steel spring.
Reason : Steel is more elastic than copper.

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Q 3Assertion & Reason1 Mark

Assertion : Young's modulus for a perfectly plastic body is zero.
Reason : For a perfectly plastic body, restoring force is zero.

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Q 4Assertion & Reason1 Mark

Assertion : Two identical solid balls, one of ivory and the other of wet-clay are dropped from the same height on the floor. Both the balls will rise to same height after bouncing.
Reason : lvory and wet-clay have same elasticity.

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Q 5Assertion & Reason1 Mark

Assertion : The bridges declared unsafe after a long use.
Reason : Elastic strength of bridges losses with time.

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Q 6MCQ1 Mark

A pan with set of weights is attached with a light spring. When disturbed, the mass-spring system oscillates with a time period of $0.6 s$. When some additional weights are added then time period is $0.7 s$. The extension caused by the additional weights is approximately given by

A
$1.38 cm$
✓
$3.5 cm$
C
$1.75 cm$
D
$2.45 cm$

Answer: B.

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Q 7MCQ1 Mark

A particle of mass $m$ is under the influence of a force $F$ which varies with the displacement $x$ according to the relation $F=-k x+F_0$ in which $k$ and $F_0$ are constants. The particle when disturbed will oscillate

A
about $x=0$, with $\omega \neq \sqrt{k / m}$
B
about $x=0$, with $\omega=\sqrt{k / m}$
✓
about $x=F_0 / k$ with $\omega=\sqrt{k / m}$
D
about $x=F_0 / k$ with $\omega \neq \sqrt{k / m}$

Answer: C.

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Q 8MCQ1 Mark

A steel wire of $1 m$ long and $1 mm ^2$ cross section area is hang from rigid end. When weight of $1 kg$ is hung from it then change in length will be (given $Y=2 \times 10^{11} N / m ^2$ )

A
$0.5 mm$
B
$0.25 mm$
✓
$0.05 mm$
D
$5 mm$

Answer: C.

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Q 9MCQ1 Mark

When load of $5 kg$ is hung on a wire then extension of $3 m$ takes place, then work done will be

✓
75 joule
B
60 joule
C
50 joule
D
100 joule

Answer: A.

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Q 10MCQ1 Mark

A force $F$ is applied on the wire of radius $r$ and length $L$ and change in the length of wire is $l$. If the same force $F$ is applied on the wire of the same material and radius $2 r$ and length $2 L$, Then the change in length of the other wire is

A
$I$
B
$2 I$
✓
$1 / 2$
D
$41$

Answer: C.

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Elasticity question types

Elasticity questions

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Elasticity JEE physics - Elasticity

Elasticity question types

Elasticity questions

Generate a Elasticity paper free