Chapter Exam

Chapter-9 Thermal Properties and Transfer — Online MCQ Test

Q: What is thermal expansion?

Answer: A. The increase in size of a substance when heated — Thermal expansion is the phenomenon where materials increase in size (length, area, or volume) when their temperature increases due to increased molecular motion.

Q: Specific heat capacity is defined as the energy required to _______ the temperature of 1 kg of a substance by 1°C.

Answer: B. raise — Specific heat capacity is the amount of thermal energy needed to increase the temperature of 1 kg of a material by 1°C (or 1 K), measured in J/(kg·°C).

Q: Comparing three metals—copper, aluminum, and iron—with the same mass and initial temperature, which receives the least heat energy to raise its temperature by 10°C? (Specific heat capacities: Cu = 390 J/(kg·°C), Al = 910 J/(kg·°C), Fe = 450 J/(kg·°C))

Answer: A. Copper — Using Q = m × c × ΔT, copper requires the least energy because it has the lowest specific heat capacity (390 J/(kg·°C)) among the three metals.

PHYSICS · Grade 10 · IGCSE cambridge

Practice Chapter-9 Thermal Properties and Transfer with a free chapter-wise online MCQ test for IGCSE cambridge Grade 10 PHYSICS. This chapter covers: Thermal expansion specific heat capacity melting boiling and conduction convection and radiation.. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter-9 Thermal Properties and Transfer — Important Questions & Answers (FAQ)

Frequently asked questions from IGCSE cambridge Grade 10 PHYSICS — Chapter-9 Thermal Properties and Transfer, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is thermal expansion?

A. The increase in size of a substance when heated ✓
B. The decrease in density of a substance when cooled
C. The change in color of a substance when heated
D. The release of heat energy from a substance

Answer: A. The increase in size of a substance when heated
Thermal expansion is the phenomenon where materials increase in size (length, area, or volume) when their temperature increases due to increased molecular motion.

Specific heat capacity is defined as the energy required to _______ the temperature of 1 kg of a substance by 1°C.

A. decrease
B. raise ✓
C. measure
D. maintain

Answer: B. raise
Specific heat capacity is the amount of thermal energy needed to increase the temperature of 1 kg of a material by 1°C (or 1 K), measured in J/(kg·°C).

Heat is transferred through a metal rod by conduction. Which statement best explains why this occurs?

A. Electrons in the metal vibrate and transfer kinetic energy to neighboring electrons ✓
B. The metal rod expands and pushes heat along its length
C. Air currents around the rod carry the heat away
D. Electromagnetic waves are emitted from the hot end of the rod

Answer: A. Electrons in the metal vibrate and transfer kinetic energy to neighboring electrons
In conduction, heat is transferred through direct contact as faster-moving (higher energy) electrons and atoms collide with slower-moving ones, transferring kinetic energy throughout the material.

Comparing three metals—copper, aluminum, and iron—with the same mass and initial temperature, which receives the least heat energy to raise its temperature by 10°C? (Specific heat capacities: Cu = 390 J/(kg·°C), Al = 910 J/(kg·°C), Fe = 450 J/(kg·°C))

A. Copper ✓
B. Aluminum
C. Iron
D. All require equal energy

Answer: A. Copper
Using Q = m × c × ΔT, copper requires the least energy because it has the lowest specific heat capacity (390 J/(kg·°C)) among the three metals.

Which of the following statements about latent heat is INCORRECT?

A. Latent heat is the energy required for a change of state at constant temperature
B. During melting, latent heat increases the temperature of a solid ✓
C. Latent heat of vaporization is greater than latent heat of fusion for the same substance
D. Energy absorbed during melting equals energy released during freezing at the same temperature

Answer: B. During melting, latent heat increases the temperature of a solid
During melting, latent heat breaks bonds between particles to change state, but the temperature remains constant. It does NOT increase temperature; only sensible heat does that.