🌟 Class
7 Science Curiosity – Chapter 7 Solutions
🔥 Heat
Transfer in Nature | Amresh Academy
📝 🔹 Let Us
Enhance Our Learning
1. Choose the correct option in each case.
2. A shopkeeper serves you cold lassi in a
tumbler. By chance, the tumbler had a small leak. You were given another
tumbler by the shopkeeper to put the leaky tumbler in it. Will this arrangement
help to keep the lassi cold for a longer time? Explain.
3. State with reason(s) whether the following
statements are True [T] or False [F].
4. Some ice cubes placed in a dish melt into
water after sometime. Where do the ice cubes get heat for this transformation?
5. A burning incense stick is fixed, pointing
downwards. In which direction would the smoke from the incense stick move? Show
the movement of smoke with a diagram.
6. Two test tubes with water are heated by a
candle flame as shown in Fig. 7.16. Which thermometers (Fig. 7.16a or Fig.
7.16b) will record a higher temperature? Explain.
7. Why are hollow bricks used to construct the
outer walls of houses in hot regions?
8. Explain how large water bodies prevent
extreme temperature in areas around them.
9. Explain how water seeps through the surface
of the Earth and gets stored as groundwater.
10. The water cycle helps in the redistribution
and replenishment of water on the Earth. Justify the statement.
✍️ 🔹 Very
Short Answer Type Questions
What is conduction?
👉 Heat
transfer without particle movement
Which materials are poor conductors of heat?
👉 Wood,
plastic, air, wool
Why is a metal pan used for cooking?
👉 Good
conductor 🔥
Name the three modes of heat transfer.
👉
Conduction, convection, radiation
Which process allows heat transfer from the Sun
to Earth?
👉
Radiation ☀️
🧠 🔹 Short
Answer Type Questions
Why do pins attached to a metal strip fall one
after the other during heating?
👉 Heat
travels step by step → wax melts
Why do we wear woollen clothes in winter?
👉 Air
trapped →
prevents heat loss
What causes land and sea breeze?
👉
Temperature difference 🌍
How does a bukhari keep a room warm?
👉
Conduction + convection + radiation
Why is it comfortable to wear white clothes in
summer?
👉
Reflect heat ☀️
📖 🔹
Descriptive Answer Type Questions
Explain the process of convection in liquids
using an activity.
How does the use of hollow bricks help in
temperature control in houses?
👉 Air
insulation 🏠
What is infiltration and how does it affect
groundwater levels?
👉 Water
seeps → stored
underground
How does heat transfer through radiation differ
from conduction and convection?
👉
Radiation → no medium needed
Explain the water cycle using heat transfer
processes.
👉
Evaporation → condensation → rain 🌧️
🚀 🔹
Exploring Questions
Why does smoke from incense or firewood rise
upward?
👉 Hot
air rises 🔥⬆️
Why is water served in clay or porcelain cups
instead of metal ones during summers?
👉 Poor
conductors → keep cool 🧊
Why do we feel warm even when we sit at a
distance from a fire?
👉
Radiation 🔥
What are aquifers and why are they important for
survival?
👉
Underground water storage 💧
How do ice stupas in Ladakh help in water
conservation?
👉 Store
water as ice ❄️ → melt
later
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