Transfer Of Thermal Energy - Radiation
Online Quiz - Radiation
- 1.Which types of surface are the best absorbers and the best emitters of infra‑red radiation?
- A.
Best absorber - black and dull Best emitter - black and dull
- B.
Best absorber - black and dull Best emitter - white and shiny
- C.
Best absorber - black and shiny Best emitter - white and dull
- D.
Best absorber - white and dull Best emitter - black and shiny
- 2.A small piece of aluminium is placed in your hand. After a short while, your hand feels warm. Explain why this happens.
- A.
Aluminium reflects the thermal energy radiated by the hand.
- B.
Aluminium absorbs thermal energy radiated from the surroundings.
- C.
Aluminium radiates thermal energy well.
- D.
Aluminium is a good absorber of radiation.
- 3.
In the following set-up, equal volumes of hot water were poured into the containers and the temperatures of both containers and contents were the same. After an hour, the temperature of container P was found to be lower than that of container Q. This shows that P is a better ____ of heat than Q.- A.
Conductor
- B.
Absorber
- C.
Radiator
- D.
Conductor and absorber
- 4.
A small cork is fixed with wax to a metal plate. An electric heater is placed close to the plate. After a time, the wax melts and the cork drops off. How does thermal energy reach the wax?
- A.
By conduction only
- B.
By conduction and convection
- C.
By radiation and conduction
- D.
By radiation and convection
- 5.A copper plate is heated to 100oC and then allowed to cool. It cools by emitting __________.
- A.
Electrons
- B.
Gamma radiation
- C.
Infra-red radiation
- D.
Ultraviolet radiation
- 6.A vacuum will prevent heat transfer by ___________.
- A.
Convection only
- B.
Conduction and convection only
- C.
Radiation only
- D.
Conduction, convection and radiation
- 7.A solar heater uses energy from the Sun to heat water. The panels of the heater are painted black. Why is this?
- A.
To improve absorption of infra-red radiation
- B.
To improve emission of infra-red radiation
- C.
To improve the conducting properties of the panel
- D.
To reduce convection currents
- 8.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.
Writing paper
- 9.When metal hot-water pipes are used to heat air in a room, how is most of the energy transferred through the metal and through the air?
- A.
Through metal - conduction through air - convection
- B.
Through metal - conduction through air - radiation
- C.
Through metal - convection through air - convection
- D.
Through metal - convection through air - radiation
- 10.The thermal energy from a campfire during a scout camp reaches the scouts’ faces mainly by __________.
- A.
Radiation only
- B.
Radiation and conduction
- C.
Convection only
- D.
Radiation and convection
Questions: 16 | Attempts: 1977 | Last updated: Mar 22, 2022
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Sample QuestionWhen you put your hand in a cup of ice water, your hand feels cold. This is because ___________.
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