Beta Question Bank for Medical: Physics>Chapter 12 - Elasticity>BEGINNER'S BOX - 1>Q 2

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Earn 100

A $2 m$ long rod of radius $1 cm$ which is fixed at one end is given a twist of $0.8$ radians at the other end. Find the shear strain developed.

Important Questions on Elasticity

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Beta Question Bank for Medical: Physics>Chapter 12 - Elasticity>BEGINNER'S BOX - 1>Q 3

The maximum stress that can be applied to the material of a wire employed to suspend an elevator is

\frac{3}{π} \times 10^{8} N m^{- 2}

.
If the mass of the elevator is

900 kg

, and it moves up with an acceleration of

2.2 m s^{- 2}

then calculate the minimum radius of the wire.

(g = 10 m s^{- 2})

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Beta Question Bank for Medical: Physics>Chapter 12 - Elasticity>BEGINNER'S BOX - 2>Q 3

The following four wires are made of same material. Which one will have the largest elongation when subjected to the same tension ?
(1) Length

500 cm

, diameter

0.05 mm

.
(2) Length

200 cm

, diameter

0.02 mm

.
(3) Length

300 cm

, diameter

0.03 mm

.
(4) Length

400 cm

, diameter

0.01 mm

.

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Beta Question Bank for Medical: Physics>Chapter 12 - Elasticity>BEGINNER'S BOX - 2>Q 4

The bulk’s modulus of copper is

138 \times 10^{9} Pa

. The additional pressure generated in an explosion chamber is

345 \times 10^{6} Pa

. Then the percentage change in the volume of a piece of copper placed in this chamber will be

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Beta Question Bank for Medical: Physics>Chapter 12 - Elasticity>Exercise (Conceptual Questions)>Q 1

The lower surface of a cube is fixed. On its upper surface, force is applied at an angle of

30^{\circ}

from its surface. The change will be in

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Beta Question Bank for Medical: Physics>Chapter 12 - Elasticity>Exercise (Conceptual Questions)>Q 2

For steel, the breaking stress is

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

and the density is

8 \times 10^{3} kg m^{- 3}

. The maximum length of steel wire which can be suspended without breaking under its own weight is

[g = 10 m s^{- 2}]

,

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Beta Question Bank for Medical: Physics>Chapter 12 - Elasticity>Exercise (Conceptual Questions)>Q 3

The dimensions of two wires $A$ and $B$ are same but their materials are different. Their load-extension graphs are shown.

If $Y_{A}$ and $Y_{B}$ are the values of Young’s modulus of elasticity of $A$ and $B$ , respectively, then,

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Beta Question Bank for Medical: Physics>Chapter 12 - Elasticity>Exercise (Conceptual Questions)>Q 4

If the density of the material increase, the value of Young’s modulus

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Beta Question Bank for Medical: Physics>Chapter 12 - Elasticity>Exercise (Conceptual Questions)>Q 5

A fixed volume of iron is drawn into a wire of length

‘ L ’

. The extension

‘ x ’

produced in the wire by a constant force

‘ F ’

is proportional to _____.