Post on 19-Jan-2021
transcript
A B
reading on thermometer
reading on thermometer
Name: _____________________ Class: _____________ ( ) Date: ___________________
Online Unit RevisionUnit 5 Energy
Section Skills Level
Unit 5 - 5.1 Energy changes Observing, inferring Easy
1 Peter has two beakers of water of different temperatures. The volumes of the two beakers of water are the same. Peter puts a thermometer in the water in beaker A and then in the water in beaker B.
Which of the following statements about the two beakers of water is correct?A They give out the same amount of light energy.B The water in beaker A has less potential energy than the water in beaker B.C The water in beaker A has more chemical energy than the water in beaker B.D The water in beaker B gives out more thermal energy than the water in beaker A.
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© Oxford University Press 2020 - 1 - New Mastering Science
225 J of thermal energy
75 J of light energy
300 J of electrical energy
300 J of electrical energy
75 J oflight energy
225 J ofthermal energy
300 J of electrical energy
75 J oflight energy
255 J of thermal energy
300 J of electrical energy
75 J oflight energy
255 J of thermal energy
Directions: Questions 2 and 3 refer to the information below.
A light bulb gives out 75 J of light energy when 300 J of electrical energy is input to it.
Section Skills Level
Unit 5 - 5.1 Energy changes Observing, communicating Average
2 Which of the Sankey diagrams below correctly shows the energy conversion of this light bulb?A
B
C
D
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wax
pin
copper rodaluminium rod iron rod
cardboard
Section Skills Level
Unit 5 - 5.1 Energy changes Inferring Easy
E 3 What is the efficiency of the light bulb?A 25%B 33%C 75%D 300%
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Section Skills Level
Unit 5 - 5.2 Heat transfer Designing investigation, conducting
practicals, inferring
Difficult
4 The diagram below shows a set-up for carrying out a fair test about which metal (copper, aluminium or iron) conducts heat better.
Which of the following statements about the fair test is INCORRECT?A The time taken for the pins to drop is the dependent variable.B The faster the pin drops from the metal rod, the better the metal conducts heat.C The width of the rods is the independent variable.D If the rods are shorter in length, the pins will drop earlier.
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© Oxford University Press 2020 - 4 - New Mastering Science
left hand
right hand
Section Skills Level
Unit 5 - 5.2 Heat transfer Observing, inferring Average
5 Chris puts his hands near a flame. Both his hands feel warm but his right hand feels warmer.
Which of the following statements is/are correct?(1) Both his hands feel warm because thermal energy is transferred from the flame to the
hands by conduction.(2) His right hand feels warmer because thermal energy is transferred upwards by convection.(3) Radiation does not take place in the process.A (2) onlyB (1) and (2) onlyC (1) and (3) onlyD (1), (2) and (3)
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© Oxford University Press 2020 - 5 - New Mastering Science
dull black flask
shiny white flask
heater
thermometers
time (min)
tem
pera
ture
(ºC
)T
X
Y
Directions: Questions 6 and 7 refer to the information below.Mandy set up the apparatus below to study the heat transfer by radiation. Both of the flasks were empty. She took the readings on the thermometers at fixed time intervals and plotted the graph below.
Section Skills Level
Unit 5 - 5.2 Heat transfer Observing, inferring Average
6 What happened at time T?A Mandy put the thermometers into the flasks.B Mandy turned on the heater.C Mandy took the first temperature reading.D Mandy finished setting up the apparatus.
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Section Skills Level
Unit 5 - 5.2 Heat transfer Observing, classifying, inferring Difficult
7 Mandy forgot to write down which line (X or Y) refers to which flask. Which of the following statements about the graph and the result of the experiment is correct?A Line X is the result of the dull black flask because the flask is a good absorber.B Line X is the result of the shiny white flask because the flask is a good absorber.C Line Y is the result of the dull black flask because the flask is a good radiator.D Line Y is the result of the shiny white flask because the flask is a good radiator.
© Oxford University Press 2020 - 6 - New Mastering Science
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Unit 5 - 5.3 Energy sources Observing, inferring Average
E 8 The graph below shows the change in global surface temperature in 1880–2019 relative to 1951–1980 average temperatures.
1880
1886
1892
1898
1904
1910
1916
1922
1928
1934
1940
1946
1952
1958
1964
1970
1976
1982
1988
1994
2000
2006
2012
2018
–0.60
–0.40
–0.20
+0.00
+0.20
+0.40
+0.60
+0.80
+1.00
+1.20
year
chan
ge in
glo
bal s
urfa
ce te
mpe
ratu
re (
C)
∘
highest record: +1.02°C in 2016
(Data source: NASA/GISS)
What does the graph tell us?(1) There is a rising trend of the global surface temperature from 1880 to 2019.(2) Global warming has caused climate change in recent decades.(3) There are no greenhouse gases in the atmosphere before 1940s.A (1) onlyB (2) onlyC (1) and (3) onlyD (2) and (3) only
© Oxford University Press 2020 - 7 - New Mastering Science
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© Oxford University Press 2020 - 8 - New Mastering Science
Section Skills Level
Unit 5 - 5.3 Energy sources Classifying Easy
E 9 Nuclear power is used as an energy source alternative to fossil fuels. Which of the following statements about using nuclear power and fossil fuels as energy sources for generating electricity is/are correct?(1) Both nuclear power and fossil fuels are non-renewable energy sources.(2) In both methods, thermal energy is released from the fuel for boiling water.(3) In both methods, air pollutants are given out.A (1) onlyB (1) and (2) onlyC (2) and (3) onlyD (1), (2) and (3)
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Section Skills Level
Unit 5 - 5.3 Energy sources Inferring Easy
E 10 Hydroelectric power is a kind of clean energy. Why is it not commonly used to replace fossil fuels to generate electricity?(1) It produces radioactive waste and this threatens human health.(2) The river where the dam is built will easily dry out. (3) A large area will become flooded due to the building of the dam.A (1) onlyB (3) onlyC (1) and (2) onlyD (2) and (3) only
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Answers1 D
2 B
3 A
4 C
5 A
6 B
7 A
8 A
9 B
10 B
For teachers’ referenceQuestion 1 2 3 4 5 6 7 8 9 10
Section 5.1
5.2
5.3
Skills Observing
Classifying
Designing investigation
Conducting practicals
Inferring
Communicating
Level Easy
Average
Difficult
For teachers only
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