Thermal Properties of Matter — Practice Quiz
Maharashtra Board · Class 11 · Physics
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Quick Quiz: Thermal Properties of Matter
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The SI unit of temperature is:
A copper rod of length 2 m at 20°C is heated to 120°C. If the coefficient of linear expansion of copper is 1.7 × 10⁻⁵ K⁻¹, find the increase in length.
The relationship between Celsius and Fahrenheit scales is:
Calculate the heat required to raise the temperature of 2 kg of water from 20°C to 80°C. (Specific heat of water = 4186 J kg⁻¹ K⁻¹)
Sample Questions
Which of the following are correct about specific heat capacity?
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It is the amount of heat required to raise temperature of unit mass by 1°C, Water has the highest specific heat capacity among common substances, Its SI unit is J kg⁻¹ K⁻¹
Specific heat capacity is an intensive property (doesn't depend on mass). It's defined as heat needed per unit mass per unit temperature change. Water's high specific heat (4186 J kg⁻¹ K⁻¹) makes it excellent for cooling systems.
Which methods of heat transfer require a material medium?
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Conduction, Convection
Conduction and convection require matter (medium) for heat transfer. Conduction occurs through molecular vibrations in solids, convection involves bulk movement of fluids. Radiation can occur through vacuum as electromagnetic waves.
The coefficient of linear expansion α is related to coefficient of volume expansion γ as:
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γ = 3α
For isotropic materials, the relationship is γ = 3α. This comes from the fact that volume expansion occurs in all three dimensions. The ratio α : β : γ = 1 : 2 : 3, where β is coefficient of areal expansion.
At what temperature do Celsius and Fahrenheit scales give the same numerical value?
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-40°
Let x be the temperature where °C = °F. Using conversion formula: x = (9/5)x + 32. Solving: x - (9/5)x = 32, (-4/5)x = 32, x = -40. So -40°C = -40°F.
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