oxford university press · web view1peter has two beakers of water of different temperatures.the...

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


75 J oflight energy

225 J ofthermal energy


75 J oflight energy



75 J oflight 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.


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


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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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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left hand

right hand


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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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.


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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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.


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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


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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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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


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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oxford university press · web view1peter has two beakers of water of different temperatures.the...

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