CBSE Class 7 Science Heat Transfer in Nature (Class 7 NCERT New) Quiz 1

1. A wooden spoon is dipped in a cup of ice cream. Its other end:

A becomes cold by the process of conduction. B becomes cold by the process of convection. C does not become cold. D becomes cold by the process of radiation.

2. Heat is:

A None of these. B Sometimes energy and sometimes matter. C A type of matter. D A form of energy.

3. A beggar wrapped himself with a few layers of newspaper on a cold winter night. This helped him to keep warm because:

A air trapped between the layers of newspaper is a bad conductor of heat. B newspaper is a conductor of heat. C friction between the layers of newspaper produces heat. D newspaper is at a higher temperature than the surrounding.

4. The heat reaches us from the sun in the form of:

A Conduction B All of these methods C Radiation D Convection

5. The movement of cooler air from the sea to the land is called:

A Land breeze B Infiltration C Water cycle D Sea breeze

6. A marble tile feels colder than a wooden tile on a winter morning because:

A is a poor conductor of heat than the wooden tile. B reflects more heat than wooden tile. C is polished while wooden tile is not polished. D is a better conductor of heat than the wooden tile.

7. Which material allows water to seep through most easily?

A Sand B Gravel C Clay D Rock

8. What limits infiltration in urban areas?

A Sandy soil B Open spaces C Concrete surfaces D Rainfall

9. Which material allows water to seep through most slowly?

A Gravel B Sand C Rock D Clay

10. Assertion: Radiation is a method of transfer of heat. Reason: The process of heat transfer that does not require any medium is called convection.

A Both A and R are true and R is the correct explanation of A. B Both A and R are true but R is not the correct explanation of A. C A is false but R is true. D A is true but R is false.