Gamma Question Bank for Engineering Physics>Chapter 8 - Mechanical Properties of Solids>Assignment>Q 21

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Two blocks of masses $1 kg$ and $2 kg$ are suspended with the help of two wires having same area of cross section. If the ratio of Young's moduli i.e., $Y_{1} : Y_{2} = 1 : 2,$ then the ratio of extensions produced in wires is

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Important Questions on Mechanical Properties of Solids

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Gamma Question Bank for Engineering Physics>Chapter 8 - Mechanical Properties of Solids>Assignment>Q 22

An iron wire of negligible mass, length

L

and cross-section area

A

has one end fixed.

A

ball of mass

m

is attached to the other end of wire. The wire and ball are rotating with an angular velocity

ω

in a horizontal plane. If

Δ L

is extension produced in wire, then the Young's modulus of wire is

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Gamma Question Bank for Engineering Physics>Chapter 8 - Mechanical Properties of Solids>Assignment>Q 23

A body of mass

M

is attached to lower end of a metal wire whose upper end is fixed. The elongation is

I .

The ratio of loss of gravitational potential energy to the energy stored in the wire is

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Gamma Question Bank for Engineering Physics>Chapter 8 - Mechanical Properties of Solids>Assignment>Q 24

A heavy rope is suspended from the ceiling of a room. If

ρ

is the density of the rope,

L

be its original length and

Y

be its Young's modulus, then increase

Δ L

in the length of the rope due to its own weight is

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Gamma Question Bank for Engineering Physics>Chapter 8 - Mechanical Properties of Solids>Assignment>Q 25

If $s$ is stress and

Y

is Young's modulus of material, the energy stored per unit volume is

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Gamma Question Bank for Engineering Physics>Chapter 8 - Mechanical Properties of Solids>Assignment>Q 28

A steel wire of diameter

2 mm

has a breaking strength of

4 \times 10^{5} N .

What is the breaking force of similar steel wire of diameter

1.5 mm ?

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Gamma Question Bank for Engineering Physics>Chapter 8 - Mechanical Properties of Solids>Assignment>Q 29

What is the greatest length of copper wire that can hang without breaking?

Breaking stress $= 7.2 \times 10^{7} N m^{- 2},$ Density of copper $= 7.2 g {cc}^{- 1}, g = 10 m s^{- 2}$

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Gamma Question Bank for Engineering Physics>Chapter 8 - Mechanical Properties of Solids>Assignment>Q 30

Which of the following is the graph showing stress-strain variation for elastomers?

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Gamma Question Bank for Engineering Physics>Chapter 8 - Mechanical Properties of Solids>Assignment>Q 31

A spherical ball contracts in volume by

0.01 %

when subjected to a normal uniform pressure of

100

atm. The Bulk modulus of its material is