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A rod of length L kept on a smooth horizontal surface is pulled along its length by a force F. The area of cross-section is A and Young's modulus is Y. The extension in the rod 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 18
When a load W is hung from a wire, it extends by ΔI. The heat produced in the process is
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Gamma Question Bank for Engineering Physics>Chapter 8 - Mechanical Properties of Solids>Assignment>Q 19

The figure shows a horizontal block that is suspended by two wires A and B which are identical except their original length. Which wire was originally shorter?

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Gamma Question Bank for Engineering Physics>Chapter 8 - Mechanical Properties of Solids>Assignment>Q 20
A force of one newton doubles the length of a cord having cross-sectional area 1 mm2. The Young's modulus of the material of the cord is
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Gamma Question Bank for Engineering Physics>Chapter 8 - Mechanical Properties of Solids>Assignment>Q 21

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., Y1 : Y2=1 : 2, then the ratio of extensions produced in wires is

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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 ΔL 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 ΔL 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