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P2 Energy Transfer by Heating
1.
Which of the following is a method used to reduce unwanted energy transfers due to frictional forces?
a) thermal insulation
b) lamination
c) lubrication
d) refrigeration
2.
Which of the following can be used to reduce unwanted thermal energy transfers from buildings?
a) lubrication
b) air conditioning
c) electrical insulation
d) thermal insulation
3.
Which of the following will result in the slowest rate of cooling of a building when the heating is turned off.
a) thin walls made from a material with a low thermal conductivity
b) thick walls made from a material with a high thermal conductivity
c) thick walls made from a material with a low thermal conductivity
d) thin walls made from a material with a high thermal conductivity
4.
From the list of thermal conductivities choose the one that is the best thermal insulator.
a) 2.4 W/m
2
°C
b) 3.5 W/m
2
°C
c) 1.2 W/m
2
°C
d) 4.5 W/m
2
°C
5.
What term is used to describe the energy stored inside a system by the atoms and molecules that make up the system?
a) thermal energy
b) internal energy
c) potential energy
d) atomic energy
6.
Which of the following is the best definition of internal energy?
a) the total kinetic energy of all the particles
b) the total kinetic and potential energy of all the particles
c) the total potential energy of all the particles
d) the total thermal energy of all the particles
7.
Which of the following processes increases the internal energy of a system?
a) heating
b) evaporating
c) melting
d) all the other three
8.
Which of the following quantities depends on the internal energy of a system?
a) mass
b) volume
c) temperature
d) density
9.
What term is used to mean give off (infrared) radiation?
a) absorb
b) transmit
c) emit
d) reflect
10.
What term is used to mean take in (infrared) radiation?
a) emit
b) transmit
c) reflect
d) absorb
11.
What term is used to mean that (infrared) radiation passes through?
a) emit
b) reflect
c) absorb
d) transmit
12.
What type of radiation do all object emit and absorb no matter what their temperature is?
a) infrared
b) ultraviolet
c) gamma
d) visible
13.
At which of the following temperatures would an object emit the most intense infrared radiation?
a) -100°C
b) 10°C
c) 100°C
d) 25°C
14.
What term is used to describe a theoretical object that always absorbs all the radiation that hits it?
a) black hole
b) dark matter
c) black body
d) dark body
15.
Which of the following would be true of a perfect black body?
a) It would not reflect any radiation or let any radiation pass through it.
b) It would reflect all radiation incident upon it.
c) It would reflect and transmit all radiation incident upon it.
d) It would deflect and re-radiate all the radiation it absorbs.
16.
Which of the following would be true of a perfect black body?
a) It would be a perfect reflector of radiation.
b) It would be a perfect transmitter of radiation.
c) It would be invisible as it absorbs all radiation.
d) It would be a perfect emitter of radiation.
17.
What does the intensity of radiation emitted by objects largely depend upon?
a) conductivity
b) temperature
c) density
d) distance
18.
Which of the following is true for an object that is at a constant temperature?
a) It is absorbing radiation at the same rate as it is emitting radiation.
b) It is absorbing radiation at a higher rate than it is emitting radiation.
c) It is absorbing radiation at a lower rate than it is emitting radiation.
d) It is not absorbing or emitting any radiation at all.
19.
Which of the following is true for an object that is cooling down?
a) It is absorbing radiation at a lower rate than it is emitting radiation.
b) It is absorbing radiation at the same rate as it is emitting radiation.
c) It is absorbing radiation at a higher rate than it is emitting radiation.
d) It is not absorbing or emitting any radiation at all.
20.
Which of the following is true for an object that has an increasing temperature?
a) It is absorbing radiation at the same rate as it is emitting radiation.
b) It is absorbing radiation at a lower rate than it is emitting radiation.
c) It is absorbing radiation at a higher rate than it is emitting radiation.
d) It is not absorbing or emitting any radiation at all.
21.
What would happen to the mean temperature of the Earth if more Solar radiation was reflected back into space by the atmosphere?
a) increase
b) stay the same
c) decrease
d) decrease then increase
22.
What would happen to the mean temperature of the Earth if more of the infrared radiation emitted by the surface was absorbed by the atmosphere?
a) decrease
b) increase
c) stay the same
d) increase then decrease
23.
What would happen to the mean temperature of the Earth if the atmosphere did not absorb any infrared radiation?
a) increase
b) decrease
c) stay the same
d) decrease then increase
24.
What would happen to the intensity of infrared radiation emitted by the Earth if the mean temperature were higher?
a) decrease
b) increase
c) stay the same
d) increase then decrease
25.
What changes can be brought about by heating a system?
a) only an increase in temperature
b) an increase in temperature and a decrease in internal energy
c) only a change of state
d) an increase in temperature or a change of state
26.
What quantity always increases when a system is heated?
a) temperature
b) thermal energy
c) kinetic energy
d) internal energy
27.
When can a material be heated but stay at the same temperature?
a) When it is uninsulated.
b) When it is insulated.
c) When it is a gas.
d) When it changes state.
28.
Which three things does the temperature change of a system depend upon?
a) volume, material, energy input
b) mass, material, energy input
c) surface area, material, energy input
d) mass, material, shape
29.
What term is used to mean the energy needed to increase the temperature of one kilogram of a substance by one degree Celsius?
a) latent heat
b) internal energy
c) thermal energy
d) specific heat capacity
30.
Which three quantities are multiplied together to calculate the change in thermal energy of a system?
a) heat, specific mass, temperature change
b) temperature, specific heat capacity, mass change
c) mass change, thermal capacity, temperature change
d) mass, specific heat capacity, temperature change
31.
What symbol is usually used to represent specific heat capacity?
a) h
b) s
c) c
d) C
32.
Calculate the energy change when 2kg of water is heated by 5°C? c = 4200 J/kg°C
a) 24,000 J
b) 52,000 J
c) 42,000 J
d) 25,000 J
33.
Calculate the energy change when 20kg of water is heated by 20°C? c = 4200 J/kg°C
a) 2,460,000 J
b) 1,860,000 J
c) 6,180,000 J
d) 1,680,000 J
34.
Calculate the energy released when 10kg of aluminium cools by 200°C? c = 900 J/kg°C
a) 1,800 kJ
b) 2,460 kJ
c) 1860 kJ
d) 6180 kJ
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