Alpha Question Bank for Medical: Physics>Chapter 12 - Elasticity>Exercise-1>Q 3

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An iron bar of length $ℓ$ and cross-section $A$ is heated from $0 ° C$ to $100 ° C .$ If this bar is so held that it is not permitted to expand or bend, the force that is developed, is

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Important Questions on Elasticity

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Alpha Question Bank for Medical: Physics>Chapter 12 - Elasticity>Exercise-1>Q 4

The diameter of a brass rod is

4 mm

and Young’s modulus of brass is

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

. The force required to stretch it by

0.1 %

of its length is:

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Alpha Question Bank for Medical: Physics>Chapter 12 - Elasticity>Exercise-1>Q 5

A steel wire is suspended vertically from a rigid support. When loaded with a weight in air, it expands by

L_{a}

and when the weight is immersed completely in water, the extension is reduced to

L_{w}

. Then relative density of the material of the weight is

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Alpha Question Bank for Medical: Physics>Chapter 12 - Elasticity>Exercise-1>Q 6

Two wires of equal length and cross-section area suspended as shown in the figure. Their Young's modulus are $Y_{1}$ and $Y_{2}$ respectively. The equivalent Young's modulus will be

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Alpha Question Bank for Medical: Physics>Chapter 12 - Elasticity>Exercise-1>Q 7

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

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Alpha Question Bank for Medical: Physics>Chapter 12 - Elasticity>Exercise-1>Q 9

A solid cylinder of radius

r

and length

l

is clamped at its upper end and the lower end is twisted through

θ

. The shear strain is given by.

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Alpha Question Bank for Medical: Physics>Chapter 12 - Elasticity>Exercise-1>Q 11

If work done in stretching a wire by

1 mm

is

2 J

, the work necessary for stretching another wire of the same material, but with double the radius and half the length by

1 mm

in joule is

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Alpha Question Bank for Medical: Physics>Chapter 12 - Elasticity>Exercise-2>Q 1

A force

F

is needed to break a copper wire having radius

R

. The force needed to break a copper wire of radius

2 R

will be:

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Alpha Question Bank for Medical: Physics>Chapter 12 - Elasticity>Exercise-2>Q 2

A

50 kg

motor rests on four cylindrical rubber blocks. Each block has a height of

4 cm

and a cross-sectional area of

16 {cm}^{2}

. The shear modulus of rubber is

2 \times 10^{6} N m^{- 2}

. A sideways force of

500 N

is applied to the motor. The distance that the motor moves sideways is