Chapter Exam

Chapter-10 Thermal Properties of Matter — Online MCQ Test

Q: What is the SI unit of temperature?

Answer: A. Kelvin — Kelvin is the SI unit of temperature used in the metric system and in scientific calculations.

Q: A metal rod of length L₀ at temperature T₀ is heated to temperature T. If α is the coefficient of linear expansion, what is the new length?

Answer: A. L = L₀[1 + α(T - T₀)] — The formula for linear thermal expansion is L = L₀[1 + α(T - T₀)], where α is the coefficient of linear expansion.

Q: Two identical copper rods are heated from 0°C to 100°C. Rod A has initial length 1 m and Rod B has initial length 2 m. Which statement is correct?

Answer: B. Rod B expands more than Rod A — Linear expansion is ΔL = L₀αΔT. Since Rod B has twice the initial length, it expands twice as much as Rod A for the same temperature change.

PHYSICS · Grade 11 · CBSE(NCERT)

Practice Chapter-10 Thermal Properties of Matter with a free chapter-wise online MCQ test for CBSE(NCERT) Grade 11 PHYSICS. This chapter covers: Heat - Temperature - Thermal expansion - Anomalous expansion of water - Specific heat capacity - Calorimetry - Change of state - Latent heat - Conduction - Convection - Radiation -.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter-10 Thermal Properties of Matter — Important Questions & Answers (FAQ)

Frequently asked questions from CBSE(NCERT) Grade 11 PHYSICS — Chapter-10 Thermal Properties of Matter, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is the SI unit of temperature?

A. Kelvin ✓
B. Celsius
C. Fahrenheit
D. Calorie

Answer: A. Kelvin
Kelvin is the SI unit of temperature used in the metric system and in scientific calculations.

Define specific heat capacity.

A. Amount of heat required to raise the temperature of 1 kg of a substance by 1°C ✓
B. Total heat contained in a substance
C. Heat released by a substance when cooled
D. Temperature change per unit time

Answer: A. Amount of heat required to raise the temperature of 1 kg of a substance by 1°C
Specific heat capacity is the heat energy required to change the temperature of 1 kg of a substance by 1°C or 1 K.

A metal rod of length L₀ at temperature T₀ is heated to temperature T. If α is the coefficient of linear expansion, what is the new length?

A. L = L₀[1 + α(T - T₀)] ✓
B. L = L₀ + α(T - T₀)
C. L = L₀α(T - T₀)
D. L = L₀(T - T₀)/α

Answer: A. L = L₀[1 + α(T - T₀)]
The formula for linear thermal expansion is L = L₀[1 + α(T - T₀)], where α is the coefficient of linear expansion.

Two identical copper rods are heated from 0°C to 100°C. Rod A has initial length 1 m and Rod B has initial length 2 m. Which statement is correct?

A. Rod A expands more than Rod B
B. Rod B expands more than Rod A ✓
C. Both expand by the same amount
D. The expansion depends on the mass, not length

Answer: B. Rod B expands more than Rod A
Linear expansion is ΔL = L₀αΔT. Since Rod B has twice the initial length, it expands twice as much as Rod A for the same temperature change.

A metal wire is suspended from a fixed point. When its temperature increases, its length increases due to thermal expansion. However, the period of oscillation when it swings as a pendulum may not change significantly. This is because:

A. The increase in length is compensated by the increase in mass
B. The gravitational acceleration increases with temperature
C. The period T = 2π√(L/g) depends on the ratio of length to gravity, and both effects partly cancel ✓
D. Thermal expansion does not affect pendulum motion

Answer: C. The period T = 2π√(L/g) depends on the ratio of length to gravity, and both effects partly cancel
Since T ∝ √L and L increases by a small factor related to α, the period changes slightly, but the effect is limited by the typically small expansion coefficient.