Questions of Heat Transfer in Nature - Questions at the end of the chapter - Chapter 7 Class 7 - Heat Transfer in Nature (Curiosity)

Last updated at May 3, 2026 by

Q1 (Easy): Mark True or False: (i) Conduction of heat takes place through solids. (ii) Land and sea breezes occur due to differential heating of land and water. (iii) White coloured objects absorb more heat compared to black coloured objects. (iv) Radiation needs a material medium for heat transfer.

Answer:
We have studied that heat transfers through different modes with specific characteristics . Based on our learning:

  • (i) True - conduction occurs mainly in solids
  • (ii) True - differential heating creates convection currents
  • (iii) False - black objects absorb more heat
  • (iv) False - radiation needs no material medium
True vs False Statements Heat Transfer Facts True Statements False Statements Conduction Occurs through solids Land-sea breeze Due to differential heating White objects Absorb more heat Radiation Needs material medium

Q8 (Easy): Why does smoke always rise upward?

Answer:
We have studied that convection occurs when heated matter becomes lighter and rises up . This is why smoke rises:

  • Hot gases from combustion are less dense
  • Cool air around is denser and sinks
  • Convection currents carry smoke upward naturally
Why Smoke Rises Step 1 - Fire heats gases Combustion produces hot gases Step 2 - Hot gases expand Heated gases become less dense Step 3 - Density difference Light hot gases rise up Smoke always goes upward!

Q11 (Easy): Why does the handle of a metal frying pan with a wooden handle not get as hot as the metallic part?

Answer:
We have studied that materials have different heat conducting abilities. This explains the temperature difference:

  • Metal pan is a good heat conductor
  • Wood handle is a heat insulator
  • Heat transfer stops at wood-metal junction
Metal vs Wood Heat Transfer Property Metal Pan Wooden Handle Heat conduction Good conductor Poor conductor (insulator) Temperature Gets very hot Stays cool Heat transfer Allows heat flow Blocks heat flow
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