Physics Chapter 9 Transfer of Heat Mcqs Test Online Punjab 9th Class 

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Question 1 of 9

Physics

1. False ceiling is done to:

Cool the room

Keep the roof clean

Insulate the ceiling

Lower the height of ceiling

Question 1 of 9

Question 2 of 9

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

Remains the same

Becomes half

Becomes double

Becomes one fourth

Question 2 of 9

Question 3 of 9

3. Which of the following is a good radiator of heat?

A dull black surface

A white surface

A green coloured surface

A shining silvered surface

Question 3 of 9

Question 4 of 9

4. Metals are good conductors of heat due to the:

Big size of their molecules

Free electrons

Rapid vibrations of their atoms

Small size of their molecules

Question 4 of 9

Question 5 of 9

5. Convection of heat is the process of heat transfer due to the:

Upward movement of molecules

Random motion of molecules

Downward movement of molecules

Free movement of molecules

Question 5 of 9

Question 6 of 9

6. Rooms are heated using gas heaters by:

Radiation only

Conduction only

Convection and radiation

Convection only

Question 6 of 9

Question 7 of 9

7. Land breeze blows from

Land to sea during the day

Sea to land during the day

Sea to land during night

Land to sea during night

Question 7 of 9

Question 8 of 9

8. In solids, heat is transferred by:

Conduction

Radiation

Convection

Absorption

Question 8 of 9

Question 9 of 9

9. In gases, heat is mainly transferred by

Conduction

Radiation

Molecular collision

Convection

Question 9 of 9

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