MCQss!!!! Part 3

11. The heat from the hot water in a metal radiator passes through the metal and then spreads around the room.What are the main processes by which the heat is transferred through the radiator and then spread around the room?12. Identify the procesess of thermal energy transfer.

Process I : Transfer of thermal energy that involves a change in fluid density.

Process II : Transfer of thermal energy from an energetic atom or molecule to a less energetic one when they collide.

13. A person sits in front of a warm fire. What is/are the main process(es) of thermal energy transfer?

A Radiation only

B Convection and radiation

C Conduction and radiation

D Conduction, convection and radiation

14.
An experiment is carried out as shown.
Why does the ice take a long time to melt, even when the water at the top of the test-tube
is boiling?
A Ice is a poor radiator of heat.
B Convection cannot occur in water.
C The metal gauze prevents heat from melting the ice.
D Water is a poor conductor of heat.

15. Two cars were painted, one was in black, the other white. The cars were left under the sun to dry. The black paint dried more quickly than the white paint. Which property of black paint makes it dry more quickly?

A It is a better conductor of heat.

B It is a better absorber of heat.

C It is a better insulator of heat.

D It is a better reflector of heat.