Heat Transfer Quiz - CBSE Class 7 Science

Free practice quiz: Heat Transfer (CBSE Class 7 Science). 20 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. Which of the following is a method of heat transfer that does not require a medium?

   1. Conduction
   2. Convection
   3. Radiation
   4. Insulation
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   Answer: C. Radiation

   Radiation is a method of heat transfer that does not require a medium, unlike conduction and convection which require contact or fluid movement respectively.

2. Heat travels from the sun to the earth through which method?

   1. Conduction
   2. Convection
   3. Radiation
   4. Evaporation
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   Answer: C. Radiation

   Heat travels from the sun to earth through radiation, a process that does not require any medium.

3. In a thermos flask, what prevents heat transfer by radiation?

   1. Vacuum
   2. Silvered walls
   3. Cork stopper
   4. Plastic cap
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   Answer: B. Silvered walls

   The silvered walls of a thermos flask reflect radiation, preventing heat transfer.

4. Which factor does NOT affect the rate of heat transfer by conduction?

   1. Material thickness
   2. Cross-sectional area
   3. Material color
   4. Temperature difference
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   Answer: C. Material color

   The color of a material does not affect conduction; thickness, area, and temperature difference do.

5. What role do 'free electrons' play in heat conduction in metals?

   1. They block heat transfer
   2. They are the primary carriers of heat
   3. They reduce the material's heat capacity
   4. They have no role in conduction
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   Answer: B. They are the primary carriers of heat

   In metals, free electrons move rapidly and transfer heat energy efficiently across the material.

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