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.

This CBSE Class 7 Science practice quiz has 20 multiple-choice questions on Heat Transfer, and 20 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz 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
   Show answer

   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
   Show answer

   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
   Show answer

   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
   Show answer

   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
   Show answer

   Answer: B. They are the primary carriers of heat

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

More questions in this quiz

Answers and explanations are in the full quiz.

1. In which process does heat transfer occur directly from one molecule to another in solids?
2. What is the primary mode of heat transfer in liquids and gases?
3. Which of the following materials is a good conductor of heat?
4. Which is an example of heat transfer through convection?
5. What property of metals makes them good conductors of heat?
6. Which condition enhances heat transfer through conduction?
7. During convection heating, what happens to the fluid particles?
8. Why does metal feel colder than wood at the same temperature?
9. Which principle is used in a vacuum flask to minimize heat transfer?
10. What happens to the heat energy in a metal rod when one end is heated?
11. Which material would be the best conductor for a radiator?
12. How can heat transfer by convection be minimized in a hot water tank?
13. Why do gases generally conduct heat poorly compared to solids?
14. Why are metals often used in cooking utensils?
15. Which best describes the flow of heat when a hot object is placed in contact with a cold one?

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