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Assertion: Latent heat is the heat required to melt a unit mass of solid.

Reason: Melting of solid causes no change in internal energy.

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Important Questions on Thermal Properties of Matter

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Alpha Question Bank for Medical: Physics>Chapter 15 - Thermal Properties of Matter>Exercise-3>Q 1
Liquid oxygen at 50 K is heated to 300 K at constant pressure of 1 atm. The rate of heating is constant. Which one of the following graphs represents the variation of temperature with time?
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Alpha Question Bank for Medical: Physics>Chapter 15 - Thermal Properties of Matter>Exercise-3>Q 2
Steam at 100°C is passed into 20 g of water at 10°C. When water acquires a temperature of 80°C, the mass of water present will be:  [Take specific heat of water =1cal g-1°C-1 and latent heat of steam =540 cal g-1
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Alpha Question Bank for Medical: Physics>Chapter 15 - Thermal Properties of Matter>Exercise-3>Q 3
The value of coefficient of volume expansion of glycerine is 5×10-4 K-1. The fractional change in the density of glycerine for a rise of 40°C in its temperature, is:?
 
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Alpha Question Bank for Medical: Physics>Chapter 15 - Thermal Properties of Matter>Exercise-3>Q 4
A piece of ice falls from a height h, so that it melts completely. Only one-quarter of the heat produced is absorbed by the ice and all energy of ice gets converted into heat during its fall. The value of h is :[Latent heat of ice is 3.4×105J kg-1 and g=10 N kg-1]
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Alpha Question Bank for Medical: Physics>Chapter 15 - Thermal Properties of Matter>Exercise-3>Q 5
A metal rod of Young's modulus Y and coefficient of thermal expansion α is held at its two ends such that its length remains invariant. If its temperature is raised by t°C, the linear stress developed in it is,
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Alpha Question Bank for Medical: Physics>Chapter 15 - Thermal Properties of Matter>Exercise-3>Q 6
An aluminium sphere of 20 cm diameter is heated from 0 °C to 100 °C. Its volume changes by (given that coefficient of linear expansion for aluminium αA1=23×10-6 °C-1)
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Alpha Question Bank for Medical: Physics>Chapter 15 - Thermal Properties of Matter>Exercise-3>Q 7
A pendulum clock lose 12 s a day if the temperature is, 40°C and gains, 4 s a day if the temperature is, 20°C. The temperature at which the clock will show correct time, and the co-efficient of linear expansion (α) of the metal of the pendulum shaft are respectively :
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Alpha Question Bank for Medical: Physics>Chapter 15 - Thermal Properties of Matter>Exercise-3>Q 8
A copper ball of mass 100 gm is at a temperature T. It is dropped in a copper calorimeter of mass 100 gm, filled with 170 gm of water at room temperature. Subsequently, the temperature of the system is found to be 75 °C. T is given by: (Given: room temperature =30 °C, the specific heat of copper =0.1 cal gm-1°C-1)