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Important Questions Chapter 7 Class 7 Science Curiosity NCERT

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Heat Transfer in Nature


Short Questions

1. What is conduction?

Answer: Conduction is the transfer of heat through a material without the movement of particles.

2.Why are cooking utensils made of metals?

Answer: Metals are good conductors of heat, so they heat up quickly.

3. What is a poor conductor of heat?

Answer: Materials like wood or glass that do not allow heat to pass easily.

4. What is convection?

Answer: Convection is the transfer of heat by the movement of particles in liquids and gases.

5. Why does smoke rise?

Answer: Smoke rises because hot air is lighter and moves upward.

6.What is radiation?

Answer: Radiation is the transfer of heat without any medium, like heat from the Sun.

7. Why do we wear light-colored clothes in summer?

Answer: Light-colored clothes reflect heat, keeping us cooler.

8. What is the water cycle?

Answer: The water cycle is the movement of water through evaporation, condensation, and precipitation.

9.What is groundwater?

Answer: Groundwater is water stored in the pore spaces of rocks and sediments underground.

10.What are ice stupas used for?

Answer: Ice stupas store water in winter to provide water for farming in spring.


Long Questions

1. Why do pins fall in a specific order when a metal strip is heated in Activity 7.1?

Answer: The pin closest to the heat falls first because heat travels through the metal by conduction. The wax melts faster near the heated end, causing the pins to fall in sequence.

2. How does a sea breeze form during the day?

Answer: During the day, land heats up faster than the sea, causing warm air to rise. Cooler air from the sea moves toward the land, creating a sea breeze.

3. Why are woollen clothes preferred in winter?

Answer: Woollen clothes trap air, which is a poor conductor of heat. This reduces heat loss from the body, keeping us warm.

4. How does the water cycle help in replenishing water on Earth?

Answer: The water cycle moves water through evaporation, condensation, and precipitation. This redistributes water to rivers, lakes, and oceans, maintaining water availability.

5. Why do houses in cold regions use materials like wood and mud in walls?

Answer: Wood and mud are poor conductors of heat, preventing heat loss. This helps keep houses warm in extremely cold climates.

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