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WorksheetsG7 UWCSEA Heat transfer
Total questions: 44
Worksheet time: 2hrs 42mins
Name
Class
Date
1.
What is the transfer of heat by movement of liquids or gases?
a)
conduction
b)
convection
c)
radiation
2.
What is the transfer of heat by direct contact?
a)
conduction
b)
convection
c)
radiation
3.
What is a transfer of heat energy by electromagnetic waves through space?
a)
conduction
b)
convection
c)
radiation
4.
You are stirring a bowl of hot soup with a metal spoon. The spoon starts to feel warmer because of _?_.
a)
conduction
b)
convection
c)
radiation
5.
You buy a lava lamp from the store. As the lamp heats up, blobs of liquid rise to the top then sink back down to the bottom. This process continues because of _?_.
a)
conduction
b)
convection
c)
radiation
6.
You are doing your homework at a desk that is underneath a lamp. You start to feel hotter because of _?_ from the lamp.
a)
conduction
b)
convection
c)
radiation
7.
Your best friend has a bunk bed. You move from the bottom bunk to the top bunk and notice that the air is warmer. The warm air rises because of _?_.
a)
conduction
b)
convection
c)
radiation
8.
You are in science class and want to see if the hot plates were used recently. You place your hand near the side of the hot plate. Without touching the hot plate, your hand feels warmer. Heat is transferred to your hand by _?_.
a)
conduction
b)
convection
c)
radiation
9.
You are roasting marshmallows at a campfire. The metal skewer (stick) that you’re cooking your marshmallow on burns your hand because of _?_.
a)
conduction
b)
convection
c)
radiation
10.
What happens when ice cubes melt in a glass?
a)
Heat travels from the ice to the warmer water.
b)
No energy is transferred.
c)
Heat is transferred from the warmer water to the ice cubes.
11.
In heat transfer, heat always flows from the _?_ substance to the _?_ substance.
a)
hotter to colder
b)
colder to hotter
c)
hotter to hotter
d)
colder to colder
12.
Which of the following is the best example of conduction?
a)
A light bulb warming a lampshade
b)
An egg cooking in a frying pan
c)
Water boiling in a pot
d)
Gases circulating in the atmosphere
13.
Walking on the warm sand sand with your bare feet demonstrates this type of heat transfer. This is an example of _?_.
a)
conduction
b)
convection
c)
radiation
14.
A group of friends gather around a fire to stay warm. This is an example of _?_.
a)
conduction
b)
convection
c)
radiation
15.
The candle will slowly heat the metal and transfer the heat directly to the mans hand. This is an example of _?_.
a)
conduction
b)
convection
c)
radiation
16.
What causes the circulation of air in the atmosphere?
a)
Air in the atmosphere is heated by the sun and sinks to the ground.
b)
The ground is heated by the sun and then heats the air, causing the air to rise.
c)
Air loses heat to the ground and then rises upward to obtain more energy.
d)
The sun heats the clouds which forces the cooler air to move away and sink.
17.
The moving of air in the image is an example of _?_.
a)
radiation
b)
convection
c)
conduction
18.
Why do we wear sweaters in cold weather?
a)
To keep cold out.
b)
To generate heat.
c)
To reduce heat loss.
d)
All of the above.
19.
On a warm sunny day, you will feel cooler wearing light colored clothes because they...
a)
reflect more radiated heat energy.
b)
prevent sweating.
c)
are not as heavy as dark clothes.
d)
let more air in.
20.
If you put a metal spoon and a wooden spoon into a pot of boiling water, one will become too hot to touch. Why?
a)
Metals conduct heat better than wood.
b)
Wood conducts heat better than metals.
c)
Metals pull in heat because heat is attracted to metals.
d)
Wood isn’t as strong as metals.
21.
1. You have a can of soda in your lunchbox that you want to keep cold. Which material will work best to keep it cold?
a)
Aluminum foil wrapped around the soda because metals transfer heat energy easily.
b)
A paper towel wrapped around the soda because paper soaks up the moisture.
c)
Wax paper wrapped around the soda because wax paper traps the moisture.
d)
Your wool sweater wrapped around the soda because wool traps air.
22.
When you hold a metal coat hanger in a camp fire to roast a marshmallow, the coat hanger might become too hot to hold. Why might the coat hanger get too hot?
a)
The heat radiates along the coat hanger.
b)
The heat builds up near the flame until it can’t hold it anymore and then moves along the coat hanger.
c)
Metal atoms vibrate with more energy when they get hot, and they collide with atoms near them, which causes the neighboring atoms to vibrate.
d)
Since metals melt in fire, they react strongly to fire and get hot easily.
23.
When placed in direct sunlight, which object will absorb the most radiated heat energy?
a)
A white sweater
b)
A snowball
c)
Aluminum foil
d)
A black sweater
24.
Which statement is true?
a)
The quicker a molecule moves, the colder it is.
b)
The slower a molecule moves, the warmer it is.
c)
The quicker a molecule moves, the warmer it is
d)
The movement on molecule don�t affect its temperature
25.
Heat transfers from an area of ____temperature to an area of ___ temperature.
a)
high to low
b)
low to high
c)
high to high
26.
Insulation is used in the walls of a building to ____.
a)
trap solar energy
b)
keep thermal energy from moving through the walls
c)
conduct thermal energy
d)
keep cold air from moving through the walls
27.
On a hot summer day, which shirt would you put on to make sure you stay cool while you are outside playing?
a)
A black shirt because it reflects the sun's energy.
b)
A white shirt because it reflects the sun's energy.
c)
A black shirt because it absorbs the sun's energy.
d)
A white shirt because it absorbs the sun's energy.
28.
which one can radiation travel threw
a)
Water
b)
Vacuum
c)
house
29.
What is infrared radiation?
a)
The circulation of a fluid caused by heating it.
b)
Transfer of heat inside a metal.
c)
Heat energy transfer by electromagnetic waves
d)
Transfer of light energy
30.
All objects emit infrared radiation (T/F)
a)
True
b)
False
31.
The hotter an object the more infrared radiation is given off (T/F).
a)
Frue
b)
False
32.
Which of the following is best at reflecting infrared radiation?
a)
Dark, matt surface
b)
Light, shiny surface
c)
Dark, shiny surface
33.
Which of the following is the best at absorbing infrared radiation?
a)
Dark, matt surface
b)
Light, shiny surface
c)
Dark, shiny surface
34.
The three cans were all filled with boiling water they were left for ten minutes and then the temperature of the water was measured again. In which can would the water temperature be the lowest?
a)
A
b)
B
c)
C
d)
There would be no difference.
35.
In an ocean, warm water moves __________ and cold water moves ____________.
a)
Down, Up
b)
Up, Down
36.
During convection, more dense currents _________ and less dense currents _________.
a)
sink, rise
b)
rise, sink
37.
At the seashore late in the afternoon on a hot day, a person often feels a strong breeze coming from the ocean because...
a)
the pounding waves generate air currents
b)
warm air over the ocean rushes in to replace the cool air that rises over the land
c)
the heavy, cool air over the ocean rushes in to replace the warm air that rises over the land
d)
there are no clouds to block the wind coming in from the ocean
38.
Warm air is __________ dense than cold air and rises creating convection currents.
a)
more
b)
less
39.
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.
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
40.
Which material is the best conductor of heat?
a)
Wood
b)
Plastic
c)
Glass
d)
Steel
41.
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
42.
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
43.
Which phase is the best conductor of heat?
a)
Solid
b)
Liquid
c)
Gas
44.
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
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