Questions with solutions

1. Which of the following is the poorest conductor of heat energy?

A. Air B. Brass C. A vacuum D. Water

2. Which of the following will be the best absorber of infra-red radiation?

A. Dark Animal Fur B. Shiny Metal Tray

C. White Plastic Bag D. Window Glass

3. An illustration of the use of a good conductor of heat is the

A. wooden pan handles

B. fibre-glass roof insulation

C. double glazing of windows

D. cooling fins on engines

4. A black plastic bag is filled with cold water and hung up in a sunny place. What causes the water temperature to rise?

A. Convection inside the black bag

B. The black bag absorbing radiation

C. The black bag acting as an insulator

D. The black bag emitting radiation

5. A small cork is fixed with wax to a metal plate.An electric heater is placed close to the plate.After some time, the wax melts and the cork drops of. How does heat reach the wax?

A. By Conduction only

B. By Conduction and Convection

C. By Radiation and Conduction

D. By Radiation and Convection

Answers

1.C

2.A

3.D

4.B

5.C