What is the definition of heat capacity?
A the quantity of heat required to raise the temperature of an object through 1 °C
B the quantity of heat required to raise the temperature of 1 kg of a substance through 1 °C
C the quantity of heat required to convert an object from solid to liquid without a change in temperature
D the quantity of heat required to change 1 kg of a substance from solid to liquid without a change in temperature
[May-2007]
In an experiment to find the specific heat capacity of a metal, it is found that 5200 J is needed to raise the temperature of a 2 kg block by 20 °C. What value for the specific heat capacity is given by these results?
-the surface area of the water;
-the temperature of the water.
How many of these changes, if any, would alter the rate at which evaporation occurs?
A 0 B 1 C 2 D 3
A swimmer climbs out of a swimming pool on a warm, dry day. Almost immediately he begins to feel cold. Why is this?
A The water allows a convection current to remove heat from his skin.
B The water takes latent heat from his body in order to evaporate.
C The water on his skin is a good conductor of heat.
D The water prevents infra-red radiation from
A 130 J / (kg °C) B 52000 J / (kg °C)
C 520 kJ /(kg °C) D 104000 kJ / (kg °C)
[May-2005]
When heat is supplied to a metallic sphere, which of reaching his body. [May-2003]
A substance is heated in an enclosed space until it becomes a gas. After the heater is removed, the temperature is recorded at regular intervals. The graph shows cooling of the substance.
A- The mass of the sphere increases
What does the section
C- The density of the sphere increases.
D- The internal energy of the sphere increases.
PQ represent?
Heat energy is supplied at the same rate to 100 g of paraffin and to 100 g of water in similar containers.
Why does the temperature of the paraffin rise more quickly?
A The paraffin has a larger specific heat capacity than water.
B The paraffin has a smaller specific heat capacity than water.
C The paraffin is less dense than water.
D The paraffin is more dense than water.
[Nov-2004]
A-boiling
B–condensing
C-melting
D–solidifying
[Nov-2002]
11-A 2 kW kettle containing boiling water is placed on a balance. It is left there and continues to boil for 5 minutes. The balance reading changes by 0.2 kg.
What does this information give as a value for the specific latent heat of vaporisation of water?
A 2000 J / kg B 3000 J / kg
C 50 000 J / kg D 3 000 000 J / kg [Nov-2006]
When a solid is melting, the temperature remains constant even though heat is being supplied because
A- The heat is being used to break up the
On a hot day, a drink in a bottle can be kept cool by intermolecular bonds. standing it in a
B-The solid is not absorbing any heat.
C-The molecules are moving faster.
D-The molecules are further apart. wet cloth over it.
Why is the drink
A student is investigating the evaporation of water.
The student can change:
-the depth of the water; placing a kept cool?
A Hot air cannot escape from the

bottle.
B The cloth conducts heat from the bottle into the water.
C The drink cannot evaporate from the bottle.
D Water evaporating from the cloth cools the drink.
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?
through the around the room
metal radiator
A conduction conduction
B conduction convection
C radiation conduction
D radiation convection [Nov-2006] air, as shown in the graph.
18- In a vacuum flask, which methods of heat transfer are prevented by the vacuum?
A conduction only B convection only
C conduction and convection only
D conduction, convection and radiation
[Nov-2003]
19- A double-glazed window has two sheets of glass separated by a layer of air.
Thermal energy is conducted and convected through the layer of air. The amount of conduction and convection varies with the thickness of the layer of
The diagram shows a room seen from above. It is cold outside the room. The room is heated by a small fire in the fireplace. Where is most heat lost by convection?
A carpet
B chimney
C glass window
D solid wall
[Nov-2005]
In a vacuum flask, which methods of heat transfer are prevented by the vacuum?
A conduction only B convection only
C conduction and convection only
D conduction, convection and radiation
The diagram shows four similar cans. Each can contains the same volume of water initially at
80 °C. After five minutes, which can will contain the coolest water?
Which thickness of air produces the smallest energy transfer, and why?
A 0.5 cm because there is little convection
B 1.0 cm because the total thermal energy transfer is least
C 1.5 cm because the total thermal energy transfer is small and conduction is low
D 2.0 cm because there is little conduction
[May-2007]
20- Using an electric kettle, 100 g of water at 100 °C is converted into steam at 100 °C in 300 seconds. The specific latent heat of steam is 2250 J / g. What is the average electrical power used?
A
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W B
𝟏𝟎𝟎 𝒙 𝟐𝟐𝟓𝟎
𝟑𝟎𝟎
W
C
𝟑𝟎𝟎 𝒙 𝟐𝟐𝟓𝟎
𝟏𝟎𝟎
W D
𝟏𝟎𝟎 𝒙 𝟑𝟎𝟎 𝒙 𝟐𝟐𝟓𝟎 W