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2.3 Thermal processes

Total questions: 77

Worksheet time: 43mins

Name
Class
Date
1.
If two objects have different temperatures, heat will flow from the cooler object to the warmer one.
a)
True
b)
False
2.
Conduction is the transfer of thermal energy ___________.
a)
in the form of electromagnetic waves such as infrared radiation without the aid of a medium
b)
through a medium without any flow of the medium
c)
by means of convection currents in a fluid (liquid or gas), due to a difference in density
d)
None of the above
3.
Heat transfer by conduction occurs when...
a)
particles bump into each other
b)
large numbers of atoms move from place to place
c)
atoms give off heat in the form of electromagnetic waves
d)
electromagnetic waves travel from place to place through a vacuum
4.
List the correct order of conduction.
1. They collide more vigorously with neighbouring particles
2. Particles at the heated end gain kinetic energy and vibrate vigorously.
3. Particles at cooler end vibrate vigorously.
a)
1, 2, 3
b)
3, 2, 1
c)
2, 1, 3
d)
1, 3, 2
5.
Which material is the best conductor of heat?
a)
Wood
b)
Plastic
c)
Glass
d)
Steel
6.
Why do metals conduct thermal energy more quickly?
a)
Particles vibrate faster
b)
Due to the presence of bound electrons
c)
Due to the presence of free electrons
d)
Metals are grey
7.
Why are gases poor conductors of electricity?
a)
Particles are close together and collisions are more frequent
b)
Particles are far apart and collisions are less frequent
c)
Particles are close together and collisions are less frequent
d)
Particles are far apart and collisions are more frequent
8.
Which phase is the best conductor of heat?
a)
Solid
b)
Liquid
c)
Gas
9.
Which of the following is an application of conduction?
a)
Thermal energy from the Sun to Earth
b)
Pots having metals bodies and plastic handles
c)
Vacuum flasks having silver bodies
d)
Air conditioners cooling down a room
10.

When air is heated, what happens to its mass?

a)

increases

b)

decreases

c)

remains the same

11.

When air is heated, its volume ____________.

a)

increases

b)

decreases

c)

remains the same

12.

When air is heated, its density ___________.

a)

increases

b)

decreases

c)

remains the same

13.

The diagram shows a refrigerator. The cooling unit is placed at the top. The cooling unit cools the air near it. What happens to the density of the air as it cools, and how does it move?

a)

The density of air increases. It moves down.

b)

The density of air increases. It moves up.

c)

The density of air decreases. It moves down.

d)

The density of air increases. It moves up.

14.

The diagram shows some rice being boiled in a pan. What is the main methods by which thermal energy is transferred (i) through the metal pan and

(ii) through the water?

a)

(i) conduction (ii) conduction

b)

(i) convection (ii) convection

c)

(i) conduction (ii) convection

d)

(i) convection (ii) conduction

15.

Convection can take place in ____________.

a)

solids only.

b)

liquids only.

c)

liguids and gases only.

d)

solids, liquids and gases.

16.

Which of the following is an application of convection?

a)

The movement of heat through a metal pan to the food.

b)

The use of ice box to keep drinks cool.

c)

The sea breeze that blows from sea to land.

d)

The use of wool blanket to keep the body warm.

17.

Which is the best position to place the heating element in an electric heater?

a)

A

b)

B

c)

C

d)

D

18.

In the process of convection, energy is transferred _________.

a)

because of temperature differences in a solid

b)

because of density differences in a liquid

c)

by the diffusion of molecules throughout a fluid

d)

by the vibration of molecules

19.

Which of the following correctly shows the direction of convection currents in water?

a)

A

b)

B

c)

C

d)

D

20.

Some dye in a beaker of water is gently heated. Why are the streaks of dye seen in the water?

a)

The hot dye is a better conductor than the cool water.

b)

The hot dye is a better convector than the cool water.

c)

The hot water is less dense than the cool water.

d)

The hot water is denser than the cool water.

21.

Convection currents occur in...

a)

fluids

b)

solids

22.

When air is heated it becomes...

a)

More dense

b)

Less dense

c)

Heavier

d)

Moist

23.

When air moves into the upper atmosphere it becomes...

a)

Cool and heavy

b)

Cool and light

c)

Warm and heavy

d)

Warm and light

24.

Within a convection current, where is the material the most dense?

a)

On its decent down

b)

In the middle

c)

On its movement upward

25.
During convection, more dense currents _________ and less dense currents _________.
a)
sink, rise
b)
rise, sink
26.

Water particles ____________ as they gain kinetic energy and push farther apart.

a)

compress

b)

expand

c)

circulate

d)

get smaller

27.
The molecules in the air are ________ when the temperature is hot.
a)
moving rapidly and are spread apart
b)
moving slowly and are close together
c)
not moving
d)
there are no air molecules
28.

By which process is thermal energy transferred through a vacuum?

a)

conduction only

b)

convection only

c)

conduction and convection only

d)

radiation only

29.

Which type of surface is the best absorber of infra-red rays?

a)

black and rough

b)

black and smooth

c)

white and rough

d)

white and smooth

30.

Which type of surface is the best radiator of infra-red rays?

a)

black and rough

b)

black and smooth

c)

white and rough

d)

white and smooth

31.

The diagram shows a simple form of solar water heater. Which tubing would give the hottest water from the outlet?

a)

black, plastic

b)

copper, painted black

c)

copper, painted white

d)

white plastic

32.

A slice of bread is placed under a red-hot electric grill to make toast. What is/are the main process/processes by which the energy reach the bread?

a)

By conduction only.

b)

By conduction and convection

c)

By convection and radiation

d)

By radiation only

33.

We feel the intense heat from the Sun when we stand in the open during noon time. How is heat transferred from the Sun to the Earth?

a)

By radiation only.

b)

By conduction and radiation only.

c)

By convection and radiation only.

d)

By conduction, convection and radiation.

34.

A teapot is needed to keep tea hot for a long period of time. Which of the following best explains why teapots are usually made of a shiny metal?

a)

Shiny surfaces are good absorbers of infra-red radiation.

b)

Shiny surfaces are good emitters of infra-red radiation.

c)

Shiny surfaces are poor absorbers of infra-red radiation.

d)

Shiny surfaces are poor emitters of infra-red radiation.

35.

Four different closed vessels contain equal amounts of ice.


Which vessel would take the shortest time for all the ice to melt?

a)

A

b)

B

c)

C

d)

D

36.

A piece of aluminium foil is used to wrap around food to be cooked in an oven. The foil has a shiny side and a dull side. Which side should be on the outside and why?

a)

The dull side should be on the outside because it absorbs heat by radiation faster.

b)

The shiny side should be on the outside because it is a better conductor of heat.

c)

The dull side should be on the outside because it encourages convection current to be set up.

d)

The shiny side should be on the outside because it is a better absorber of heat by radiation.

37.

The diagram shows a vacuum flask.

The main reason for the vacuum is to reduce heat transfer by

a)

conduction and convection.

b)

conduction only.

c)

radiation only.

d)

convection only.

38.

The following cans are filled with hot water. Which one of the following cans will lose heat most quickly?

a)

A

b)

B

c)

C

d)

D

39.

Two cars, one painted dull black and the other a shiny white, were left in the sun. Which car will be heated up faster? When the two cars had reached the same temperature they were driven into the shade. Now, which car will cool down faster?

a)

A

b)

B

c)

C

d)

D

40.

Which of the following will increase the rate of heat transfer?

1 Increase the temperature difference.

2 Paint the surface black.

3 Increase the surface area.

a)

1 and 2 only

b)

1 and 3 only

c)

2 and 3 only

d)

1, 2 and 3

41.
What is the transfer of heat by movement of liquids or gases?
a)
Radiation
b)
Convection
c)
Conduction
d)
Heat
42.
What are waves that can transfer heat through the vacuum of empty space?
a)
Electromagnetic waves
b)
Convection
c)
Conduction
d)
Heat
43.
What is a transfer of heat energy by electromagnetic waves?
a)
Radiation
b)
Convection
c)
Conduction
d)
Heat
44.
What is the transfer of heat by direct contact?
a)
Convection
b)
Electromagnetic waves
c)
Radiation
d)
Conduction
45.
What is the measurement of the average kinetic energy of a substance?
a)
Kinetic energy
b)
Temperature
c)
Thermal energy
d)
Potential energy
46.
What is a substance that does NOT conduct heat well?
a)
Conductor
b)
Insulator
c)
Convector
d)
Radiator
47.
What is a substance that DOES conduct heat well?
a)
Conductor
b)
Insulator
c)
Convector
d)
Radiator
48.
What is the total amount of kinetic energy in a substance?
a)
Potential energy
b)
Kinetic energy
c)
Thermal energy
d)
Temperature
49.
What is the transfer of kinetic energy from one substance to another?
a)
Heat
b)
Energy
c)
Thermal energy
d)
Temperature
50.
What is the energy of the movement of particles in a substance?
a)
Potential energy
b)
Kinetic energy
c)
Thermal energy
d)
Temperature
51.

Boiling Water

a)

Conduction

b)

Convection

c)

Radiation

52.

Curling Iron

a)

Conduction

b)

Convection

c)

Radiation

53.

Weather Patterns

a)

Conduction

b)

Convection

c)

Radiation

54.

Sun Bathing

a)

Conduction

b)

Convection

c)

Radiation

55.

Mantle

a)

Conduction

b)

Convection

c)

Radiation

56.

Feet on Hot Sand

a)

Conduction

b)

Convection

c)

Radiation

57.

Lava Lamp

a)

Conduction

b)

Convection

c)

Radiation

58.

Hot Air in a Toaster

a)

Conduction

b)

Convection

c)

Radiation

59.

Microwaving Food

a)

Conduction

b)

Convection

c)

Radiation

60.

Heat Lamps

a)

Conduction

b)

Convection

c)

Radiation

61.

Cold Pack on Person

a)

Heat is transferred from the cold pack to the person.

b)

Heat is transferred from the person to the cold pack

c)

The cold pack is getting warmer. The person is getting colder.

d)

The cold pack is getting colder. The person is getting warmer.

62.

Hand Warmer in a Hand

a)

Heat is being transferred from the hand warmer to the hand.

b)

Heat is being transferred from the hand to the hand warmer.

c)

The hand is getting warmer. The hand warmer is getting cooler.

d)

The hand warmer is getting warmer. The hand is getting cooler.

63.
If an object has particles that are moving very quickly, the object 's temperature is probably _____.
a)
cold
b)
slow
c)
big
d)
hot
64.
When the temperature of matter decreases the particles ...
a)
speed up and move farther apart
b)
speed up and move closer together
c)
slow down and move farther apart
d)
slow down and move closer together
65.
Phase change from a solid to a liquid...
a)
melting
b)
freezing
c)
evaporation
d)
condensation
66.
Phase change from a liquid to solid?
a)
Melting
b)
Condensation
c)
Evaporation
d)
Freezing
67.
If I am adding thermal energy to a liquid it will turn into _______. 
a)
Solid
b)
Liquid
c)
Gas
d)
Melt
68.
The baby chickens are kept warm from the heat lamps demonstrates this type of heat transfer. 
a)
conduction
b)
convection
c)
radiation
69.
Walking on the warm sand sand with your bare feet demonstrates this type of heat transfer. 
a)
conduction
b)
convection
c)
radiation
70.
A group of friends gather around a fire to stay warm.
a)
conduction
b)
convection
c)
radiation
71.

Near the ceiling of a room the air is warmer. The warm air rises because of

a)

conduction

b)

convection

c)

radiation

72.

A huge rock at the state park gets so hot during the day because of

a)

conduction

b)

convection

c)

radiation

73.

A chair is placed several feet from a fireplace. The fireplace has a glass screen. The side of the chair facing the fireplace gets warm because of

a)

conduction

b)

convection

c)

radiation

74.

The handle of a metal spoon warms up when it is placed in a hot bowl of soup because of

a)

Convection

b)

Conduction

c)

Radiation

d)

insulation.

75.

An iron is placed on your clothes to smooth out the wrinkles. The iron transfers heat to your clothes through

a)

conduction

b)

convection

c)

radiation

76.

A pot is placed directly on a stove. The pot gets hot due to

a)

conduction

b)

convection

c)

radiation

77.

Near the ceiling of a room the air is warmer. The warm air rises because of

a)

conduction

b)

convection

c)

radiation

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