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Worksheets33. Heat
Total questions: 70
Worksheet time: 35mins
The ball and ring apparatus shown is used to study the effect of heat on metals.
The source of heat is usually a Bunsen flame.
Which one of the following statements is INCORRECT?
When the ball is heated strongly, it can pass through the ring.
If only the ring is heated strongly, the cold ball will pass through the heated ring.
When the ball is heated strongly and then allowed to cool, it will pass through the ring.
If both the ball and ring are placed in ice-cold water, it is possible for the ball to pass through the ring.
The round bottomed flask is placed in a large beaker of water, and it is filled with a liquid.
After heating the flask, what position on the glass tube would you expect the liquid to be?
A
B
C
When the flask was heated, air inside expanded.
When the flask was allowed to cool, the water rose up the glass tubing.
Why did this happen?
The air inside the flask contracted.
Liquids expand when cooled
The water expanded and rose up the glass tubing.
The volume of the air in the flask increased.
The apparatus shown in the diagram was used to investigate the expansion and contraction of a gas.
What is observed when the flask is heated?
Bubbles pass from the glass tubing into the water.
The level of water in the basin rises.
The level of water rises up the glass tube.
The water in the basin begins to get very hot.
A bimetallic strip consisting of brass and steel riveted together is placed in the flame of a Bunsen burner.
The strip is seen to bend because
the two metals expand at different rates.
only one of the metals expands.
the two metals expand at the same rate.
the bunsen flame causes one of the metals to melt.
In the experiment shown in the diagram a hair dryer heats air in a flask. Bubbles are seen to pass out of the glass tube.
What does this experiment demonstrate?
Gases expand when heated.
Liquids expand when heated.
Gases contract when heated.
Water is sucked into the flask.
Which one of the following is TRUE when particles of matter are heated?
They gain energy, will move faster and get further apart.
They lose energy, will move faster and get further apart.
They lose energy, will move slower and get closer together.
They gain energy, will move slower and get closer together.
In winter, when the temperature goes below 0 ºC, lakes are liable to freeze.
In which one of the following ways is this most likely to happen?
Ice forms at the surface first.
The lake freezes from the bottom up.
All the water in the lake turns to ice at the same time.
The lake freezes from the centre first, and then into the banks.
The photo shows a hot air balloon.
Why does the balloon rise when the air inside is heated?
The hot air inside the balloon is less dense than cold air outside.
The air outside is less dense than the hot air in the balloon, and it allows the balloon to rise.
The wind blows the balloon upwards.
The hot air inside the balloon is attracted to the sun.
Some thermometers contain a red liquid.
What happens to this liquid when the thermometer is placed in hot water?
The liquid expands.
The liquid evaporates.
The liquid changes colour.
The liquid contracts.
A bimetallic strip consists of two different metals welded together and on a handle as shown. The metals expand at different rates when heated.
Choose THREE uses of a bimetallic strip from the list below.
Toaster
Thermostat
Fire alarm
Smart phone
Bicycle
When a substance is heated its particles gain energy and expand filling a bigger volume.
What happens to the mass of a substance when it is heated?
The mass remains the same.
The mass decreases.
The mass increases.
Which one of the following statements is incorrect?
The mass of the metal gets bigger when it is heated, and it gets smaller when it is cooled.
The ball expands when heated.
After the ball is cooled, it gets small enough to fit through the hole.
Metals will expand when heated.
At what position on the glass tube would you expect the liquid to be after placing the flask in ice cold water?
C
A
B
Sometimes a glass jar may be difficult to open.
Placing it under a tap running with hot water makes it easier to open. Why?
Because the metal cap expands more than the glass and the gap between metal and glass gets bigger.
Because the metal cap expands and fills the gap between the glass and metal.
Because the gap between the glass jar and the warmer metal cap gets smaller.
Liquids (a) when heated and contract when cooled.
Which one of the following is NOT a method of heat transfer?
Insulation
Conduction
Convection
Radiation
In supermarkets, some freezers do not have lids.
Why does the food not get warm?
The cold air is denser than warm air and falls to the bottom.
Heat is conducted out of the freezer through its walls.
Cold air does not have enough energy for its particles to move.
A lid would cause heat to be better convected away from the freezer.
Heat may be transferred from hot to cold places by three of the methods listed below.
Choose the method of heat transfer that occurs in the heating of the Earth by the Sun.
Radiation
Conduction
Convection
Convection and radiation
When you touch a warm radiator, heat is transferred to your body by
Conduction
Insulation
Convection
Radiation
The apparatus shown is used in the laboratory to demonstrate
Convection
Conduction
Radiation
Insulation
Heat may be transferred in three different ways.
One of these methods of heat transfer does not require a medium.
Which one of the following is this?
Radiation
Conduction
Convection
A vacuum flask is designed to keep liquids hot or cold. Which part of the flask stops heat escaping by conduction and convection?
Vacuum
Shiny glas walls
Stopper
Plastic
Baked Alaska contains ice-cream covered by white meringue containing small bubbles of air. It is prepared by baking it in an oven for ten minutes.
Why does the ice-cream not melt?
The meringue is a poor conductor of heat.
It is not left in the oven long enough.
The white meringue is poor at absorbing heat radiation.
Ice cream is a poor conductor of heat.
Infra-red photography is used in cameras with night time vision.
Which one of the following statements about infra-red radiation is correct?
The hotter an object is, the more infra-red radiation is released.
Hot objects do not radiate infra-red radiation.
Infra-red radiation cannot be detected with a thermometer.
Cold objects emit more infra-red radiation than hot objects.
What does the experiment shown in the diagram tell us about the transfer of thermal energy in water?
Water is a poor conductor of thermal energy.
That ice cubes sink in hot water.
Heat travels by convection through liquids.
Water is a good radiator of thermal energy.
The convection of heat occurs in liquids and gases.
Which one of the following statements about thermal convection is correct?
When two immiscible liquids are mixed, the warmer liquid will rise above the cooler liquid.
The particles in a liquid travel more slowly when heated.
Thermal convection occurs in water, but does not occur in air.
In a hot water tank, the heating coils are placed at the very top of the tank.
Electrical wiring consists of both conductor and insulator.
Select the INCORRECT statement from the following:
The particles in a conductor are very far apart.
Heat transfer is very slow in insulators.
In good conductors, the particles are very close together.
Heat transfers easily through conductors.
The diagram shows the immersion heater of a domestic hot water tank.
Select the correct path that the hot water takes as it is being heated by the coil.
C
A
B
D
Energy can be transferred in different ways.
When there is a difference in temperature between two nearby objects, heat energy may be transferred
by radiation
electrically
by heating
elastically
A light bulb transfers energy by radiation to its surroundings.
Some of this energy will be transferred as visible light and some will be transferred as infrared radiation.
Which of these two types of radiation is regarded as useful?
Visible light
Neither visble or infra red radiation
Both infra red and visible light
Infra red radiation
Metals are usually good conductors of heat, that is they transfer heat quite efficiently.
Identify the three best thermal conductors from the following list:
Copper
Silver
Steel
Wood
Plastic
Wooden ladles are used to stir hot soup because of it’s
good insulation of heat.
nice appearance
good conduction of heat
good insulation of electricity
good conduction of electricity
The picture shows two metal cubes at different temperatures touching each other.
If two objects are at different temperatures are placed in contact, heat will flow
from the warmer object to the colder object.
upwards and then sink.
from the colder object to the warmer object.
back and forth from one object to the other object.
The diagram shows the main parts of a saucepan.
In terms of conducting heat, which metal would be best for making the base of the saucepan?
Copper
Aluminium
Cast iron
Stainless steel
The materials below may all be used in the construction of a house.
Which one of these is the best insulator?
Expanded polystyrene
Wood
Aluminium
Glass
Select a good thermal conductor from the following substances:
Most frying pans have a plastic handle.
This is because
plastic is a poor conductor of heat.
plastic is good at absorbing heat.
plastic is a poor insulator.
plastic does not melt when heated.
Select a good thermal insulator from the following list:
A substance that does not allow heat to travel through it is called an
(a)
(a) currents are formed when liquids are heated.
The photograph shows a solar panel on a roof. Water passing through the panel is heated by the sun.
How does heat from the sun travel, through the vacuum of space, to earth?
(a)
A substance that is a solid at room temperature was heated above its melting point and then allowed to cool at a steady rate. The temperature was recorded at regular intervals.
Why is there no drop in temperature between B and C?
The substance is changing from a liquid to a solid at this temperature.
The substance is changing from a solid to a liquid at this temperature.
The substance is being stirred.
The particles in the substance have stopped moving.
The substance used in this experiment is beeswax which has a melting point of 62 ºC. The rate of heat loss was constant throughout the experiment. What is happening to the beeswax between points A and B on the graph?
Its temperature is decreasing.
Its temperature is increasing.
It is changing from solid to liquid.
It is changing from liquid to solid.
Steam in a bathroom often changes into water on the mirror.
This change of state is called
condensation
saturation
evaporation
freezing
On a very cold winter morning, water on the ground may turn into ice.
This change of state is called
freezing
saturation
condensation
evaporation
The graph shows the cooling curve for beeswax.
At which part of this graph does the beeswax have the least amount of energy?
D
A
B
C
Water in warm air quite often condenses on cold surfaces.
When a water condenses, it changes state from
gas to liquid
liquid to solid
liquid to gas
solid to gas
The substance used in this experiment is beeswax which has a melting point of 62 ºC.
The rate of heat loss was constant throughout the experiment.
What is happening to the beeswax between points C and D on the graph?
The temperature of the solid is decreasing
It is changing from liquid to solid.
The temperature of the liquid is decreasing
It is changing from solid to liquid.
The graph shows the temperature at which four different substances melt and change from solid to liquid.
Which of these temperatures would most likely represent chocolate?
B
A
C
D
When a substance changes state such as a liquid changing to a gas, what name is given to the heat change taking place?
(a)
A solid substance is heated until it changes state into a liquid and is then allowed to cool.
The diagram shows the cooling curve for this substance.
At what part of the curve is the substance freezing?
AB
BC
CD
DE
A piece of candle wax was heated until it melted.
A thermometer was then placed in the melted wax and its temperature recorded as it cooled down.
Which one of the following statements is correct?
The melting point of the wax is 85ºC.
Some of the wax is still a liquid between B and C.
The melting point of the wax is 55ºC.
The wax is still a liquid between C and D.
The graph shows the cooling curve of a substance.
Which one of the following statements is correct?
Room temperature is 20 ºC.
The melting point of this substance is 20 ºC.
The boiling point of this substance is 60 ºC.
The boiling point of this substance is 84 ºC.
A solid is heated until it changes state into a liquid and is then allowed to cool.
Its temperature is recorded as it cools.
What is the freezing point of this substance?
60 ºC
84 ºC
20 ºC
40 ºC
When ice melts, latent heat is absorbed by the ice.
Latent heat is the energy needed to change the state of a substance without changing its (a) .
A solid is heated and its temperature is recorded every minute. A graph of results is drawn like that shown.
What is happening between B and C?
The substance is liquid with its temperature increasing.
The substance is solid with its temperature decreasing.
The substance is changing from liquid to solid.
The substance is changing from solid to liquid.
The substance is solid with its temperature increasing.
When a substance changes from one state to another, the temperature remains (a) .
