Unit B: Understanding Energy
Transfer Technologies
UNIT TEST
SCIENCE 14
Miss Arvai
Name: ______________________________________
Date: __________________________
Score: _______/70=________%
Name: _________________________________
Date: __________________________
Total:
70 marks
Science 14
Unit B: Understanding Energy Transfer
Technologies
UNIT TEST
A. Multiple Choice (25 marks)
Directions: Read each question carefully and select the best response. Record your
answer on the response sheet provided.
1. When you walk on a beach on a hot day, the sand is burning hot but the water might
be cold. Which statement provides the best explanation for this?
a)
b)
c)
d)
Sand has a higher specific heat capacity than water.
Water takes much more energy to heat up than sand.
There is more sand than water, so it heats up quicker.
Both water and sand heat up the same, but water was initially cooler.
2. What kind of energy is the energy of motion?
a)
b)
c)
d)
kinetic energy
nuclear energy
potential energy
mechanical energy
3. Two objects are the same size but have different heat capacities. Object A has a heat
capacity of 4.00 J/g•°C and object B has a heat capacity of 2.00 J/g•°C. If both are left
out in the Sun, which of the following would happen?
a)
b)
c)
d)
Object A would likely heat up faster than object B.
Object B would likely heat up faster than object A.
Object A and Object B would heat up at the same rate.
Sun does not have enough energy to warm the objects up.
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Name: _________________________________
Date: __________________________
4. Choose the best definition for temperature.
a)
b)
c)
d)
total kinetic energy
average kinetic energy
electromagnetic energy
average potential energy
5. What usually happens to molecules to start convection currents?
a)
b)
c)
d)
They split.
They contract.
They become heavier.
They gain kinetic energy and become more active.
6. Look at these two containers of water. Both of these containers are at the same
temperature. How does their amount of heat energy compare?
10 kg
a)
b)
c)
d)
1 kg
They both have the same heat energy.
1 kg has twice as much heat energy.
1 kg has 10 times as much heat energy.
10 kg has 10 times as much heat energy.
7. On a sunny day, which way do sea breezes blow?
a)
b)
c)
d)
toward land
toward the sea
away from land
there is no sea breeze
8. Which insulation would best keep a house cool in the summer?
a)
b)
c)
d)
clay brick — R-value - 0.11
solid wood — R-value - 1.25
wood shavings — R-value - 2.42
rigid urethane foam — R-value - 7.50
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Name: _________________________________
Date: __________________________
9. How do people who live in hot desert areas protect their bodies from Sun’s heat?
a)
b)
c)
d)
wear dark clothes that cover a few parts of the body
wear dark clothes that cover the body as much as possible
wear light-coloured clothes that cover a few parts of the body
wear light-coloured clothes that cover the body as much as possible
10. Why are radiators and hot air vents placed near the floor of houses and other
buildings?
a)
b)
c)
d)
cold air sinks
hot air sinks
cold air rises
hot air rises
11. Why is water used around the world as a radiator coolant in cars?
a)
b)
c)
d)
Water has a high specific heat capacity.
Water is cheap and plentiful.
Water cools off quickly.
A and C
12. Many creatures dig themselves into the snow in wintertime because the temperatures
there are much warmer. What is the most likely reason that temperatures are warmer
under the snow?
a)
b)
c)
d)
The ground stays warm because Earth has a very high specific heat capacity.
The creatures get wet under the snow, which keeps them warm.
Snow is an excellent insulator and prevents heat from escaping.
The ground stays warm because it is warm underground.
13. Wearing too many layers of clothing on a cold day can actually make you colder.
Which of the choices below is not a reason for this?
a)
b)
c)
d)
Packing clothing under a coat can compress the air spaces needed to trap warm air.
It is harder for moisture to leave the clothing, thus making it wet.
Too much clothing can cause sweating, which cools you down.
Extra clothing warms the body and reduces heat production.
3
Name: _________________________________
Date: __________________________
14. Your cooler sits in direct sunlight. Unfortunately you have lost the lid, so you decide
to use a towel to cover the cooler. Which is the best choice to prevent heat loss?
a)
b)
c)
d)
a dry, white towel
a dry, black towel
a wet, white towel
a wet, black towel
15. Why do wood shavings insulate better than solid wood?
a)
b)
c)
d)
Wood has a higher thermal conductivity
Wood shavings are lighter and fill a wall easier.
Wood shaving are better at absorbing moisture.
Wood shavings have air spaces that hold air still.
16. Which of the following is a second class lever?
a)
b)
c)
d)
Axe
teeter-totter
baseball bat
wheelbarrow
17. What kind of machine is the volume dial on a stereo?
a)
b)
c)
d)
Lever
inclined plane
wheel and axle
block and tackle
18. What are the two components of work?
a)
b)
c)
d)
force and distance
force and effort
length and distance
time and effort
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Name: _________________________________
Date: __________________________
19. What simple machine makes an elevator work?
a)
b)
c)
d)
Wedge
Screw
Pulley
Lever
20. What type of lever do the biceps make when they contract?
a)
b)
c)
d)
first class
second class
third class
fourth class
21. How can you make a car more energy efficient?
a)
b)
c)
d)
paint the car
burn more fuel
tune the engine
idle excessively
22. When Miss Arvai goes bowling she has to lift a 5-pin bowling ball with a weight of 20
N a distance of 2 metres before she starts each frame. The amount of work she has to
do each frame is:
a)
b)
c)
d)
10 joules
20 joules
30 joules
40 joules
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Name: _________________________________
Date: __________________________
23. Which of the following pairs of levers tend to be force multipliers?
a)
b)
c)
d)
first and second class levers
first and third class levers
second and third class levers
third and fourth class levers
24. The correct unit to measure energy is
a)
b)
c)
d)
Joule
Newton
Newton-metre
Either a or c
25. Which of the following is not a distance multiplier?
a)
b)
c)
d)
an axe
a mallet
a hammer
a baseball bat
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Name: _________________________________
Date: __________________________
B. Matching (20 marks)
Directions: Match the definitions on the right with the vocabulary terms on the left. Record
your answer in the space provided.
26. _______ friction
27. _______ heat absorption
28. _______ equilibrium
29. _______ first class lever
30. _______ load
31. _______ insulation
a)
b)
c)
d)
e)
f)
g)
h)
32. _______ conduction
i)
33. _______ convection
34. _______ efficiency
35. _______ inclined plane
j)
k)
36. _______ pulley
l)
37. _______ temperature
m)
n)
38. _______ heat
39. _______ sea breeze
o)
p)
40. _______ simple machines
q)
41. _______ second class lever
42. _______force multiplier
r)
s)
t)
43. _______distance multiplier
u)
A method of heat transfer that involves currents
The average kinetic energy of all particles in an object
balance
a lever in which the load is found between the fulcrum
and the effort
the ability to do work
a method of heat transfer that involves electromagnetic
waves
Resistance caused by two surfaces rubbing together
A comparison of the work the machine does with the
energy it uses to that work, usually given as a
percentage
The cool wind that blows from a cool ocean or lake
toward the warmer land
A lever in which the fulcrum is found between the load
and the effort
The sum of all kinetic energies of all particles in an
object
Any simple machine that exerts a large force on the
load but requires only a small effort
The rate at which a material absorbs heat
A mild wind that flows from the cool land out to the
warmer sea
A method of heat transfer that requires contact
Any simple machine that moves a load through a large
distance but requires only a short effort distance
A simple machine that consists of a sloping surface
such as a ramp, switchback, or screw.
Any tool or machine that involves only one movement
Any material that slows heat transfer
A simple machine consisting of a grooved wheel on
which a rope turns
The object that is moved by a lever
44. _______energy
45. _______radiation
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Name: _________________________________
Date: __________________________
C. Short Answer (25 marks)
Directions: Read each question carefully and provide your response in the space
provided. You may use point form. Answer every question!!!
46. As temperature of the water increases, what happens to the motion of food colouring
in water? (*hint* you may want to use a diagram!) (2 marks)
47. Explain how large bodies of water, such as oceans and lakes, have a moderating
influence on climate of nearby cities. (2 marks)
48. Explain how convection, conduction and radiation help to warm foods in the oven.
(*hint* a picture says a thousand words!) (3 marks)
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Name: _________________________________
Date: __________________________
49. You heat copper (SHC = 0.38 J/g•C) and an iron pot (SHC = 0.45 J/g•C) using the
same method. Which pot heats more quickly? Explain your answer. (2 marks)
50. A construction worker is trying to decide whether to use Fiberglass (blown) or Wood
(pine) to insulate a house. What would you suggest to the construction work? Explain
why. (2 mark)
51. Explain how firefighters are protected from intense heat. (2 marks)
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Name: _________________________________
Date: __________________________
52. Describe three ways Inuit clothing helps keep the wearer warm. (3 marks)
53. Explain three ways that heat transfer can be stopped in our homes in order to keep the
heat out during the summer and the heat in during the winter. (3 marks)
54. Describe where there are 2 different simple machines on this bicycle and what they are
used for. (2 marks)
55. A fixed pulley does not decrease the amount of effort required to lift a load. How
does using a fixed pulley make lifting a load easier? (2 marks)
56. List two ways a home may become more energy efficient. (2 marks)
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