Heat Quiz - ICSE Class 7 Science
Free practice quiz: Heat (ICSE Class 7 Science). 47 multiple-choice questions with answers and explanations. Play online, no sign-up needed.
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Which of the following processes involves the transfer of heat through electromagnetic waves, requiring no medium for propagation?
- Conduction
- Convection
- Radiation
- Evaporation
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Answer: C. Radiation
Radiation is the transfer of heat through electromagnetic waves. This is how the Sun's heat reaches Earth. Conduction and convection require a medium.
Which of the following is a good insulator of heat?
- Copper
- Aluminum
- Wood
- Iron
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Answer: C. Wood
Wood is a poor conductor of heat and is therefore a good insulator. Copper, aluminum, and iron are metals and are good conductors.
Which material would be best for the outer jacket of a thermos flask to reduce heat loss by radiation?
- Dull black
- Shiny silver
- Dull white
- Matte red
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Answer: B. Shiny silver
Shiny surfaces are poor absorbers and poor emitters of thermal radiation. Silvered surfaces in thermos flasks are highly reflective.
A sea breeze blows from the sea to the land during the day because:
- The sea heats up faster than the land.
- The land cools down faster than the sea.
- The land heats up faster than the sea.
- The sea cools down faster than the land.
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Answer: C. The land heats up faster than the sea.
During the day, land heats up faster than water. The warmer air above the land rises, creating low pressure. Cooler, denser air above the sea moves in to replace it, creating a sea breeze.
When water vapor cools and turns back into liquid water, it forms dew. This process is:
- Evaporation
- Boiling
- Condensation
- Freezing
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Answer: C. Condensation
Condensation is the change of state from gas to liquid, which happens when water vapor cools.