📘 Chapter 11: Transfer of Thermal Energy – Exercise Short Questions
Prepared by Muhammad Tayyab, Subject Specialist Physics, Govt Christian High School Daska. Based on PECTAA 2026 syllabus.
📖 8 Exercise Short Questions covering conduction in metals, convection currents, land/sea breezes, thermals, radiation, surface absorption/emission, and greenhouse effect. Each answer can be toggled for active recall practice.
📚 Related Resources – Chapter 11
📝 Exercise Short Questions (11.1 – 11.8)
11.1
What are the three primary types of heat transfer?
The three primary types of heat transfer are conduction, convection, and radiation.
11.2
Why does heat travel faster in metals compared to non-metals?
Metals have free electrons that can move freely within the material. These fast-moving electrons carry energy quickly from the hot areas to the cooler areas of the metal. This is why heat moves more rapidly through metals than non-metals.
11.3
How does convection transfer heat in liquids and gases?
Convection is the transfer of heat through the movement of molecules from a hot area to a cold area.
When a liquid or gas is heated, it expands and becomes less dense (lighter). The heated fluid rises above the heat source, and cooler fluid moves in to take its place, creating a continuous circulation.
When a liquid or gas is heated, it expands and becomes less dense (lighter). The heated fluid rises above the heat source, and cooler fluid moves in to take its place, creating a continuous circulation.
11.4
What natural phenomenon causes land and sea breezes?
These breezes are caused by convection currents. During the day, land heats up faster than the sea, creating a sea breeze; at night, the land cools faster than the sea, creating a land breeze.
11.5
How do birds and gliders take advantage of convection currents?
Gliders take advantage of these rising currents of warm air to stay in the air for extended periods.
Similarly, birds use thermals to stay aloft for hours without flapping their wings.
Similarly, birds use thermals to stay aloft for hours without flapping their wings.
11.6
What is radiation, and how does it transfer heat?
In radiation, heat transfer occurs through electromagnetic waves without requiring a medium.
11.7
Why does a dull black surface emit and absorb more radiation than a shiny silver surface?
Dull and dark-coloured surfaces are very good at absorbing and emitting infrared radiation. That's why a dull black surface heats up quickly and cools down faster by giving off more heat.
In contrast, shiny and light-coloured surfaces are poor absorbers and emitters of radiation.
In contrast, shiny and light-coloured surfaces are poor absorbers and emitters of radiation.
11.8
How does the greenhouse effect help regulate Earth's temperature?
The greenhouse effect occurs when greenhouse gases trap heat from the Sun, maintaining a temperature suitable for life. Without this effect, Earth would be too cold to sustain living organisms.
💡 Exam Tip:
For exercise short questions, focus on precise definitions and real-life applications. Remember: conduction requires direct contact, convection occurs in fluids via density changes, radiation needs no medium, dark/rough surfaces are best absorbers/emitters, and the greenhouse effect is vital for Earth's temperature regulation.
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
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