✅ Chapter 11: Transfer of Thermal Energy – Multiple Choice Questions
Prepared by Muhammad Tayyab, Subject Specialist Physics, Govt Christian High School Daska. Based on PECTAA 2026 syllabus.
📖 7 Exercise MCQs covering conduction, convection, radiation, land/sea breezes, surface effects on radiation, greenhouse effect, and Sun's heat transfer. Each question includes answer key with detailed explanation.
📚 Related Resources – Chapter 11
📝 Multiple Choice Questions (1–7)
11.1
Which method of heat transfer requires direct contact between particles?
✅ Correct Answer: (C) Conduction
Conduction is the process by which heat is transferred through direct contact between particles in a material, without any actual movement of the material.
Conduction is the process by which heat is transferred through direct contact between particles in a material, without any actual movement of the material.
11.2
What causes convection currents in liquids and gases?
✅ Correct Answer: (B) The rising of warm regions and sinking of cooler regions
When a liquid or gas is heated, it becomes less dense and rises, and cooler fluid from the surrounding area moves in to take its place.
When a liquid or gas is heated, it becomes less dense and rises, and cooler fluid from the surrounding area moves in to take its place.
11.3
The natural phenomenon caused by convection currents is:
✅ Correct Answer: (B) land and sea breezes
Land and sea breezes are caused by convection. During the day, the land heats up faster than the sea, creating a sea breeze. At night, the land cools down more quickly than the sea, creating a land breeze.
Land and sea breezes are caused by convection. During the day, the land heats up faster than the sea, creating a sea breeze. At night, the land cools down more quickly than the sea, creating a land breeze.
11.4
How does heat transfer occur through radiation?
✅ Correct Answer: (C) Through electromagnetic waves without needing a medium
In radiation, heat transfer occurs through electromagnetic waves without requiring a medium.
In radiation, heat transfer occurs through electromagnetic waves without requiring a medium.
11.5
The surface which absorbs and emits the most radiation is:
✅ Correct Answer: (B) dark and rough surfaces
Dull and dark-coloured surfaces are very good at absorbing and emitting infrared radiation. Rough surfaces absorb and emit radiation better.
Dull and dark-coloured surfaces are very good at absorbing and emitting infrared radiation. Rough surfaces absorb and emit radiation better.
11.6
What is the role of the greenhouse effect in Earth's temperature regulation?
✅ Correct Answer: (C) It traps heat to maintain a stable temperature
The greenhouse effect refers to the process by which the Earth's atmosphere traps some of the Sun's heat, maintaining a temperature that is suitable for life.
The greenhouse effect refers to the process by which the Earth's atmosphere traps some of the Sun's heat, maintaining a temperature that is suitable for life.
11.7
The Sun's heat reaches the Earth:
✅ Correct Answer: (C) through radiation via electromagnetic waves
The Sun's heat does not reach the Earth through conduction or convection, as there is no medium between the Sun and Earth's atmosphere. Instead, heat is transferred via radiation.
The Sun's heat does not reach the Earth through conduction or convection, as there is no medium between the Sun and Earth's atmosphere. Instead, heat is transferred via radiation.
📊 Answer Key with Explanations
| Q. No | Correct Answer | Explanation |
|---|---|---|
| 11.1 | (C) Conduction | Conduction is the process by which heat is transferred through direct contact between particles in a material, without any actual movement of the material. |
| 11.2 | (B) The rising of warm regions and sinking of cooler regions | When a liquid or gas is heated, it becomes less dense and rises, and cooler fluid from the surrounding area moves in to take its place. |
| 11.3 | (B) land and sea breezes | Land and sea breezes are caused by convection. During the day, the land heats up faster than the sea, creating a sea breeze. At night, the land cools down more quickly than the sea, creating a land breeze. |
| 11.4 | (C) Through electromagnetic waves without needing a medium | In radiation, heat transfer occurs through electromagnetic waves without requiring a medium. |
| 11.5 | (B) dark and rough surfaces | Dull and dark-coloured surfaces are very good at absorbing and emitting infrared radiation. Rough surfaces absorb and emit radiation better. |
| 11.6 | (C) It traps heat to maintain a stable temperature | The greenhouse effect refers to the process by which the Earth's atmosphere traps some of the Sun's heat, maintaining a temperature that is suitable for life. |
| 11.7 | (C) through radiation via electromagnetic waves | The Sun's heat does not reach the Earth through conduction or convection, as there is no medium between the Sun and Earth's atmosphere. Instead, heat is transferred via radiation. |
💡 Exam Tip:
For MCQs, focus on understanding key differences between conduction, convection, and radiation. Remember that radiation does not require a medium, convection occurs only in fluids, and dark/rough surfaces are best absorbers and emitters of radiation.
Unit 10✨ Thermal Physics
Unit 11🔥 Transfer of Thermal Energy
Unit 12Waves
Unit 13Sound
Unit 14Light
Unit 15Electrostatics
Unit 16Electricity
Unit 17Electromagnetism
Unit 18Electromagnetic Induction & EM Waves
Unit 19Electronics
Unit 20Atomic and Nuclear Physics
Unit 21Space and Environment
📖 Complete syllabus coverage for Class 10 Physics (PECTAA 2026) – Units 10 to 21
Created by Hira Science Academy | Aligned with PECTAA 2026 Syllabus