YEAR 9
Heat and Temperature Test
A
Name: _______________________
M
E
overall grade =
FORMS OF ENERGY
1 Complete each of these sentences by naming the type of energy.
(a) A moving object has ____________ energy.
(b) Energy which is stored in a spring is called ____________ energy.
(c) A boulder rolling downhill is losing ______________________ energy, but gaining
______________________ energy.
(d) Burning a piece of coal changes ______________ potential energy into _________ and _________
energy.
2. Some types of energy are called “potential energy”. Give one example and describe what
“potential” means.
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3. (a) The two rocks below have the same mass. Which one has more gravitational potential energy?
(b) Discuss why you have given this answer
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4. Is the amount of light energy produced more than, less than, or the same as the amount of electrical
energy used by a light bulb?
The amount of light energy produced is (tick one)
____ more than the amount of electrical energy used.
____ less than the amount of electrical energy used.
____ the same as the amount of electrical energy used.
Give a reason to support your answer.
___________________________________________________________________________
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5. a) Energy can be changed from one form to another. Name an object or situation that can make
each of the following changes possible (the first one is done for you):
b)
i)
Heat to kinetic:
___Steam engine___
ii)
Electrical to light:
__________________________________________________
iii)
Chemical potential to heat:
iv)
Kinetic to sound:
v)
Gravitational potential to kinetic:
___________________________________________
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Name each type of energy as it is transformed in each object or situation:
i) Car engine:
_______________________ to
_______________________
ii) Hair dryer:
_______________________ to
_______________________
iii) Burglar alarm:
iv) Escalator:
_______________________ to
_______________________ to
_______________________
_______________________
6. When a bimetallic strip (2 different metals joined together) is heated it bends.
(a) Using the idea of particles inside the metals, discuss why the strips expand.
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(b) Why does the strip bend?
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7. Using the list below:
(i) ice cube
(ii) spark from a fire
(iii) teapot full of hot water
(iv) glass of cold water.
Which item:
(a) Contains the most heat energy?
________________________
(b) Has the slowest-moving particles?
________________________
(c) Has the highest temperature?
________________________
(d) Clearly explain why one of the above examples has more heat energy than the others.
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8. The data show the energy needed to heat a container of water from 20°C:
Heat energy added
(kJ)
0
5.0
9.0
13.0
17.0
21.0
25.0
30.0
Temperature
(°C)
20
30
40
50
60
70
80
90
(a) Plot a line graph of temperature (vertical) versus heat energy (horizontal) on the grid
below.
(b) How much energy was needed to change the temperature of the water from 20°C to 50°C? ______
(c) From your graph, find the temperature of the water when 20 kJ of energy had been added. ______
(d) How much energy was needed to change the water temperature from 40°C to 50°C?
________
(e) How much energy was needed to change the water temperature from 60°C to 70°C?
_______
9. Write “reflected” or “absorbed” for each of the following.
(a) A black plastic steering wheel gets very hot in the sun. ______________________
(b) Aluminium foil placed over hot food helps to keep the food hot. ______________________
(c) An LPG tank is painted white.
_______________________________
(d) A stove element is black.
_______________________________
(e) A teapot is made of shiny metal.
_______________________________
10. State whether each of the following is true or false and give a reason for your answer:
(a) Radiation cannot travel through a vacuum
True /False
Reason: _______________________________________________________________________
(b) Conduction occurs mainly in solid substances.
T /F
Reason____________________________________________________________________________
(c) Most metals are poor heat energy conductors.
T /F
Reason____________________________________________________________________________
(d) A poor heat energy conductor is called an insulator.
T /F
(e) Substances that trap air are good insulators.
T /F
Reason____________________________________________________________________________
11. Discuss why a jug would be less effective for heating if the element was placed halfway up the
jug?
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12. The house in the figure has many
features that prevent heat loss:
(a) Name three features of the house that
prevent heat loss by conduction.
___________________________________
___________________________________
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(b) Explain why double glazing (air space between sheets of glass) stops heat loss.
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13. Complete the following sentences using the words conduction, convection or radiation:
(b) A piece of bread in a toaster is heated by ______________________________
(c) Metal objects feel cold at room temperature because they carry heat energy away from your hand
by
_______________________________________________
d) Placing a lid on a saucepan prevents heat loss by _____________________________
e) When a person sits beside a fire, the heat reaches them mostly by ______________________
f) Heat goes up the chimney from an open fire by
__________________________________
h) The only way that heat can travel through empty space is by
________________________
j) A blanket keeps you warm by preventing heat loss by__________________________
14. James decided to find out which colour of container absorbed the most heat radiation. Five
identical jars were painted black, green, red, white or silver. Each jar was filled to the rim with
water. James placed the black jar in the kitchen where it was warmest, the green and red jars were
on the bathroom window sill and the silver and white jars were in James’s bedroom. After two
hours he recorded the temperature of the black, white and silver jars. An hour later he measured
the temperature of the green and red jars.
(a) State two reasons why his experiment was not a fair test.
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(b) Write a method for the experiment that would be a fair test.
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