# Class 9 Physics Chapter 9 Transfer of Heat MCQs 2024

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## Class 9 Physics Chapter 9 Transfer of Heat MCQs With Answers

1: In solids, heat is transferred by:

(b) conduction
(c) convection
(d) absorption

2: What happens to the thermal conductivity of a wall if its thickness is doubled?

(a) becomes double
(b) remains the same
(c) becomes half
(d) becomes one fourth

3: Metals are good conductors of heat due to the:

(a) free electrons
(b) big size of their molecules
(c) the small size of their molecules
(d) rapid vibrations of their atoms

4: In gases, heat is mainly transferred by

(a) molecular collision
(b) conduction
(c) convection

5: Which of the following is a good radiator of heat?

(a) a shining silvered surface
(b) a dull black surface
(c) a white surface
(d) green colored surface

6: Why metals are good conductors of heat? Explain why:

(a) a metal feels colder to touch than wood kept in a cold place?
(b) Does land breeze blow from land towards sea?
(c) the double-walled glass vessel is used in the thermos flask?
(d) deserts soon get hot during the day and soon get cold after sunset?

7: Convection of heat is the process of heat transfer due to the:

(a) random motion of molecules
(b) downward movement of molecules
(c) upward movement of molecules
(d) free movement of molecules

8: False ceiling is done to

(a) lower the height of the ceiling
(b) keep the roof clean
(c) cool the room
(d) insulate the ceiling

9: Rooms are heated using gas heaters by

(a) Conduction only
(d) Convection only

10: The land breeze blows from

(a) sea to land during the night
(b) sea to land during the day
(c) land to sea during the night
(d) land to sea during the day