Welcome to Bodhiclasses, where science is taught with clarity, depth, and a strong connection to real life. To help students strengthen their understanding of Class 7 Science – Chapter 7: Heat Transfer in Nature, here is a carefully designed set of extra practice questions with answers.
These questions go beyond the textbook and are ideal for revision, exams, worksheets, and conceptual mastery.
A. Multiple Choice Questions (MCQs) – Heat Transfer
(10 Questions)
1. Which of the following is the best conductor of heat?
(a) Wood
(b) Plastic
(c) Iron
(d) Air
Answer: (c) Iron
2. Heat transfer in solids mainly occurs through:
(a) Radiation
(b) Convection
(c) Conduction
(d) Evaporation
Answer: (c) Conduction
3. Which material is used to make handles of cooking utensils?
(a) Copper
(b) Aluminium
(c) Plastic
(d) Iron
Answer: (c) Plastic
4. Sea breeze occurs during:
(a) Night
(b) Evening
(c) Morning
(d) Day
Answer: (d) Day
5. Which process of heat transfer does not require a medium?
(a) Conduction
(b) Convection
(c) Radiation
(d) Evaporation
Answer: (c) Radiation
6. Smoke always moves upward because:
(a) It is heavy
(b) It is cold
(c) It contains hot air
(d) Gravity pulls it up
Answer: (c) It contains hot air
7. Which of the following allows maximum seepage of water?
(a) Clay
(b) Soil
(c) Sand
(d) Gravel
Answer: (d) Gravel
8. Woollen clothes keep us warm because they:
(a) Produce heat
(b) Absorb heat
(c) Trap air
(d) Reflect heat
Answer: (c) Trap air
9. Which of the following is an underground water storage layer?
(a) Glacier
(b) Aquifer
(c) Cloud
(d) River
Answer: (b) Aquifer
10. Ice stupas are mainly used to:
(a) Store ice for tourism
(b) Control floods
(c) Supply water during summer
(d) Prevent snowfall
Answer: (c) Supply water during summer
B. One-Mark Questions – Heat Transfer
(10 Questions)
1. Name the process by which heat travels in metals.
Answer: Conduction
2. Which gas mainly helps in trapping heat in woollen clothes?
Answer: Air
3. What is the direction of sea breeze?
Answer: From sea to land
4. Which process causes hot air to rise?
Answer: Convection
5. Name the process by which water vapour forms clouds.
Answer: Condensation
6. What is infiltration?
Answer: Seepage of water into the ground
7. Which colour of clothes is best for summer?
Answer: Light colours
8. Name one poor conductor of heat.
Answer: Wood
9. What form of water is present in clouds?
Answer: Water droplets / water vapour
10. Which source provides heat energy for the water cycle?
Answer: The Sun
C. Two-Mark Questions
(10 Questions)
1. Why do metals feel colder than wood in winter?
Answer: Metals conduct heat away from our body faster than wood, so they feel colder.
2. Why is air called an insulator?
Answer: Air does not allow heat to pass through it easily and slows down heat transfer.
3. What causes land breeze at night?
Answer: At night, land cools faster than sea, so cool air from land moves toward the sea.
4. Why are cooking utensils made of metals?
Answer: Metals are good conductors of heat and allow fast cooking.
5. Explain why smoke detectors are fixed near ceilings.
Answer: Smoke rises upward due to hot air, so detectors work best near ceilings.
6. Why does water heat up more slowly than soil?
Answer: Water has a higher heat capacity and circulates heat through convection.
7. What is an aquifer?
Answer: An underground layer of rocks and sediments that stores groundwater.
8. How does radiation differ from conduction?
Answer: Radiation does not need a medium, while conduction requires direct contact.
9. Why do hollow bricks keep houses cool?
Answer: Air trapped in hollow bricks acts as an insulator and reduces heat transfer.
10. Name two processes involved in water cycle.
Answer: Evaporation and precipitation
D. Higher Order Thinking Skills (HOTS)
(5 Questions with Answers)
1. Why do coastal areas experience less extreme temperatures than inland areas?
Answer: Large water bodies heat up and cool down slowly, moderating the temperature of nearby land.
2. How would life on Earth be affected if radiation did not occur?
Answer: Heat from the Sun would not reach Earth, making life impossible.
3. Why is it better to wear multiple thin blankets instead of one thick blanket in winter?
Answer: Air trapped between layers acts as an insulator and reduces heat loss.
4. How does excessive construction reduce groundwater levels?
Answer: Concrete surfaces prevent infiltration, reducing groundwater recharge.
5. Why are ice stupas a sustainable solution for water scarcity?
Answer: They store winter water as ice and release it slowly during summer when water is scarce.
