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Heat - Grade 7 ANNUAL EXAMS

Total questions: 85

Worksheet time: 48mins

Name
Class
Date
1.
Transfer of heat through actual movement of molecules is
a)
conduction
b)
radiation
c)
convection
d)
diffusion
2.
What is the definition of CONVECTION?
a)
When heat transfers through waves
b)
When heat transfers from objects that are touching
c)
Heat traveling from the sun
d)
movement in a gas or liquid in which the warmer parts move up and the colder parts move down
3.
Mercury is used in thermometers because it
a)
is heavy
b)
is a liquid
c)
expands uniformly
d)
is a metal
4.
The form of energy that produces a feeling of hotness is called as
a)
work
b)
heat
c)
energy
d)
none of the above
5.
With the increase in heat, temperature will
a)
increase
b)
stay constant
c)
decrease
d)
double
6.
A clinical thermometer is calibrated from:
a)
35∘C to 42∘C
b)
10∘C to 100∘C
c)
320∘C to 110∘C
d)
0∘C to 100∘C
7.
Stainless steel pans are usually provided with copper bottoms. The reason for this could be that
a)
Copper bottom makes the pan more durable
b)
Such pans appear colorful
c)
Copper is a better conductor of heat than the stainless steel
d)
Copper is easier to clean than the stainless steel
8.
Which of the following statement(s) is/are in correct?<br />(i) Two thin woollen sweaters are warmer than a thick woollen sweater. <br />(ii) It saves fuel if we cook food in a vessel which is blackened at the bottom and polished from the sides. <br />(iii) The cable wires between two poles are left loose because in summers, the wires do not break on expanding.
a)
Only (i) and (iii)
b)
Only (ii) and (iii)
c)
Only (iii)
d)
Only (i)
9.
Light coloured clothes are preferred in summer because
a)
light colours are good radiators of heat
b)
light colours are poor absorbers of heat
c)
they soak sweat faster
d)
they allow body heat to escape faster
10.
Why a digital thermometer is widely used for the measurement of the temperature?
a)
Analog display
b)
Mercury
c)
High accuracy
d)
Low accuracy
11.
Name the thermometer which ranges between -10∘C to 110∘C
a)
Clinical thermometer
b)
Digital thermometer
c)
Laboratory thermometer
d)
None of these
12.
The heat in metals is conducted by the process of
a)
Radiation
b)
Convection
c)
Conduction
d)
Absorption
13.
Glass, plastic, wood are examples of
a)
Conductor
b)
Insulator
c)
Convectors
d)
Radiators
14.
During the night
a)
Land cools more quickly than the sea
b)
Sea cools quickly than the land
c)
Land heats up
d)
Sea water heats up
15.
Temperature is measured with the help of
a)
Thermometer
b)
Barometer
c)
Ammeter
d)
Voltmeter
16.
In fluids, heat transfer takes place primarily due to
a)
Conduction
b)
Convection
c)
Radiation
d)
None
17.
Which one of these is a good conductor of heat
a)
Wood
b)
Straw
c)
Rubber
d)
Copper
18.
Which of these is a bad conductor of heat?
a)
Wool
b)
Gold
c)
Copper
d)
Aluminium
19.
Three modes of transfer of heat are_____, _____ and _________
a)
Radiation, Convection, Conduction
b)
Absorption, Convection, Conduction
c)
Radiation, Absorption, Conduction
d)
Radiation, Convection, Absorption
20.

Water and air are (a)   conductor of heat. (type in small letters ONLY)

21.

(a)   is the liquid used in thermometer. (type in small letters ONLY)

22.

Liquid and gases transfer heat by (a)   method. (type in small letters ONLY)

23.

Metals are (a)   conductor of heat. (type in small letters ONLY)

24.

The degree of hotness or coldness of a body is called (a)   . (type in small letters ONLY)

25.
The heat from a lamp allows a lizard to remain warm. This is an example of which type of heat transfer?
a)
radiation
b)
conduction
c)
convection
d)
insulation
26.
Which will most likely occur when raw egg is placed on black pavement on a hot, summer day?
a)
The pavement will conduct the heat and cook the egg.
b)
The egg will reflect the heat and make the pavement hotter underneath.
c)
The egg will absorb the heat  and leave the pavement hotter underneath.
d)
The pavement will absorb the heat from the egg, and the egg will stay raw.
27.
Jordan places a hot spoon into a container of ice cream. How does this help him scoop  out the ice cream? 
a)
The coolness from the ice cream is conducted to the spoon making it easier to scoop out.
b)
The coolness from the ice cream is radiated to the spoon making it easier to scoop out.
c)
The warmth of the spoon is conducted to the ice cream  making it easier to scoop out.
d)
The warmth of the spoon is radiated  to the ice cream making it easier to scoop out.
28.
Which describes what can happen as a result of radiation?
a)
 A piece of wood burns in a fire.
b)
A shirt is hot after having been  ironed.
c)
A can of soup is heated in a pot on a stove.
d)
A car’s inside temperature rises  to over 100 degrees on a sunny day.
29.
John put a heat pack on his cold feet. What will most likely be the result?
a)
The cold from John’s feet will  be radiated into  the heat pack.
b)
The warmth of the heat pack will be radiated  onto John’s feet.
c)
The cold from John’s feet will be conducted  into the heat pack.
d)
The warmth of the heat pack will be conducted  onto John’s feet.
30.
Which best describes the process of convection?
a)
Convection is the primary way  heat travels  through rays.
b)
Convection is the primary way heat travels  through metals.
c)
Convection is the primary way heat travels  through appliances.
d)
Convection is the primary way heat travels  through liquids and gasses.
31.
Tom puts a metallic cover over his car’s windshield after parking. How does this control  the sun’s rays  during a sunny day?
a)
It prevents heat energy from leaving the car.
b)
It controls the temperature by providing shade.
c)
It reflects the sun’s rays away from the windshield.
d)
It absorbs heat in the windshield  protector and  cools the car.
32.
Which is an example of heat being transferred by conduction?
a)
a furnace heating the air in a school
b)
an ice cube melting in a person’s hand
c)
a pot of water on a stove boiling
d)
the sun heating water in a swimming pool
33.

A group of friends gather around a fire to stay warm. This is an example of ________.

a)

conduction

b)

convection

c)

radiation

34.

Which describes what can happen as a result of radiation?

a)

A piece of wood burns in a fire.

b)

A shirt is hot after having been ironed.

c)

A can of soup is heated in a pot on a stove.

d)

A car’s inside temperature rises to over 100 degrees on a sunny day.

35.

The baby chickens kept warm by the heat lamps. This is an example of ________.

a)

conduction

b)

convection

c)

radiation

36.

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

37.

You get sunburned due to __________ from the sun.

a)

conduction

b)

convection

c)

radiation

38.

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

a)

conduction

b)

convection

c)

radiation

39.

The heat from a lamp allows a lizard to remain warm. This is an example of which type of heat transfer?

a)

radiation

b)

conduction

c)

convection

40.
Which best describes the process of convection?
a)
Convection is the primary way  heat travels  through rays.
b)
Convection is the primary way heat travels  through metals.
c)
Convection is the primary way heat travels  through appliances.
d)
Convection is the primary way heat travels  through liquids and gasses.
41.

Hot coffee is stirred with a spoon; the spoon gets hot due to ________.

a)

conduction

b)

convection

c)

radiation

42.

The kind of heat transfer that travels through space in electromagnetic waves is ______________________.

a)

convection

b)

radiation

c)

conduction

43.

The type of heat transfer that creates currents in water is called ________.

a)

conduction

b)

convection

c)

radiation

44.

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

a)

conduction

b)

convection

c)

radiation

45.
Which direction will the heat flow while this person holds a hot cup of tea?
a)
from the cup to her hand
b)
from her hand to the cup
c)
no heat is transferred
46.
Which direction will the heat flow while this ice cap melts?
a)
there is no heat transfer
b)
from the icecap to the water
c)
from the water to the icecap
47.

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

a)

conduction

b)

convection

c)

radiation

48.

What form of heat transfer circulates the warm and cool air in a house?

a)

Conduction

b)

Radiation

c)

Convection

49.
What is the definition of CONDUCTION?
a)
When heat is transferred from objects like rays of light or electromagnetically.
b)
a  hot liquid or air that  expands, becomes less dense, and rises or becomes more dense, and sinks.
c)
When heat transfers from objects that are touching.
d)
When heat transfers through the heater or AC in your house.
50.
What is the definition of CONVECTION
a)
When heat transfers through waves.
b)
When heat transfers from objects that are touching.
c)
a  hot liquid or air that  expands, becomes less dense, and rises or becomes more dense, and sinks.
d)
Heat traveling from the sun
51.
Which of the following is an example of convection?
a)
A hair dryer is drying up your hair.
b)
When the AC or heater changes the temperature.
c)
When a car engine turns hot after being turned on.
d)
When you are making soup and the water is rising and lowering.
52.
Warm air rises and the cool air sinks demonstrates this type of heat transfer. 
a)
conduction
b)
convection
c)
radiation
d)
Insolation 
53.
Heat transfers from an area of ____temperature to an area of ___ temperature.
a)
high to low
b)
low to high
c)
high to high
d)
It can travel high to low and low to high. 
54.
Walking on the warm sand sand with your bare feet demonstrates this type of heat transfer. 
a)
conduction
b)
convection
c)
radiation
55.

A certian type of decorative lamp contains colored liquids. These liquids form globs that break off and rise to the top of the liquid. The globs rise due to ...

a)

Conduction

b)

Radiation

c)

Convection

56.

A college student holds the back of his hand near an iron to see if it is hot. Heat is transferred to his hand by ..

a)

Conduction

b)

Radiation

c)

Convection

57.

A heater is placed under one corner of a waterbed mattress. Warm air moves throughout the mattress because of ...

a)

Conduction

b)

Radiation

c)

Convection

58.

One end of a copper rod is placed in a flame of a Bunsen burner. Small pieces of wax placed along the rod melt a progressively larger distance from the flame. Heat is transferred through the rod by ...

a)

Conduction

b)

Radiation

c)

Convection

59.

A house burns down. On the house across the street, all the vinyl siding is twisted and warped by the heat. The heat was transferred across the street by ...

a)

Conduction

b)

Radiation

c)

Convection

60.

A huge rock at a state park gets so hot during the day that you cannot sit on it from ...

a)

Conduction

b)

Radiation

c)

Convection

61.

A fireman feels a door and it is hot from the fire on the other side due to ...

a)

Conduction

b)

Radiation

c)

Convection

62.

The cause of weather systems on earth is ...

a)

Conduction

b)

Radiation

c)

Convection

63.

You are in the top bunk of a bunk bed and you want to turn down the air conditioner on while your friend on the bottom bunk is fine is caused by ...

a)

Conduction

b)

Radiation

c)

Convection

64.

A hot air balloon rises into the sky because of ...

a)

Conduction

b)

Radiation

c)

Convection

65.

A chocolate bar melts in a car on a sunny day because of ...

a)

Conduction

b)

Radiation

c)

Convection

66.
Snowman melting in the sun.
a)
Conduction
b)
Convection
c)
Radiation
67.
Tongue freezing to a metal pole.
a)
Conduction
b)
Convection
c)
Radiation
68.
Ice cubes keeping lemonade cold.
a)
Conduction
b)
Convection
c)
Radiation
69.
Making toast in a toaster.
a)
Conduction
b)
Convection
c)
Radiation
70.
Heating a kettle on a hot furnace.
a)
Conduction
b)
Convection
c)
Radiation
71.

Which of the following is an example of convection?

a)

A hair dryer is drying up your hair.

b)

When the AC or heater changes the temperature.

c)

When a car engine turns hot after being turned on.

d)

When you are making soup and the water is rising and lowering.

72.

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

73.
Carole owns a two story house with a heating and cooling unit on each floor. In the winter she mostly uses the downstairs unit because the volume of warm air __________ and __________ warming the whole house through __________.
a)
expands, rises, convection
b)
expands, sinks, conduction
c)
contracts, rises, conversion
d)
contracts, sinks, contraption
74.

During a heat transfer demonstration, students observed water being pumped around a closed loop in an engine. The moving water carries heat from the hot engine to the radiator. Which type of heat transfer is involved when the cooler water absorbs heat while in contact with the hot engine?

a)

Convection

b)

Conduction

c)

Insulation

d)

Radiation

75.

What type of heat transfer is occurring in the picture below? (the pan is touching the burner)

a)

conduction

b)

convection

c)

radiation

d)

insulation

76.

All of the following are good conductors of heat EXCEPT

a)

Copper

b)

Iron

c)

Plastic

d)

Aluminum

77.

What causes hot and cold water to become the same temperature once they are combined?

a)

The heat moves from cooler temperature to warmer temperature.

b)

The energy of the hot water runs out.

c)

Heat (thermal) energy from the hot water is transferred to the cold water.

d)

Heat (thermal) energy causes the water to boil.

78.
Students in a science class performed an experiment with hot and cold water. They dyed the hot water red and the cold water blue. When the students layered the water, they noticed that the hot water rose to the top and the cold water sank. What was this demonstrating?
a)
Radiation
b)
Air Pressure
c)
Evaporation
d)
Density
79.
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
80.
Which situation best represents convection?
a)
Heat from a campfire
b)
A hot air balloon taking off
c)
Touching a hot piece of metal
d)
Getting sunburned
81.
The process by which gases in the atmosphere absorb thermal energy and radiate it back to earth is called
a)
the thermal effect.
b)
the greenhouse effect.
c)
global warming.
d)
radiation balance
82.
When the amount of energy received from the sun and the amount of energy returned to space are about equal, it is called
a)
radiation balance
b)
seasonal equality.
c)
solar reradiation.
d)
global warming.
83.
_________ items absorb more heat than _________ items. 
a)
Darker, lighter
b)
Lighter, darker
84.
Boiling water is an example of what two types of heat transfer
a)
Conduction and Radiation
b)
Conduction and Convection
c)
Radiation and Convection
85.
Ice melting in a cup is caused by....
a)
The ice is heated up by the drink
b)
Ice is cooling down the liquid

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