PL RS P4L44 Revision 12 WS

Primary 4

Rocket Science

Name
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Tutor LESSON 44 (REVISION- HEAT AND TEMPERATURE)

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Topic LESSON 44 (REVISION- HEAT AND TEMPERATURE)

Primary 4: Rocket Science

Lesson Outline

• Notes
• Activity 1: Fun facts
• Activity 2: MCQS
• Activity 3: Open-ended Questions
• Activity 4: Science in daily life

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Primary 4: Rocket Science

Revision – Heat and temperature: Fill in the blanks

• Heat is transferred/ conducted away from a ___________ object to a
__________ object until both objects reach equilibrium (the same
temperature).

• Heat is transferred more quickly when the contact area between the 2 objects
are _____________.

• Matter _____________ when heated and ___________ when cooled. Its
volume changes but mass remains the same.

• When an object is heated, it gains heat so its temperature ____________.
When an object is cooled, it loses heat so its temperature ______________.

• The ____________ the exposed surface area of an object, the faster heat is
lost to / gained from the surroundings.

• When air is heated, it expands and becomes less dense. The surrounding
cold air, being denser, sinks, causing the heated air to move __________.

• If there are objects above this air, like overturned cups or paper spirals, the
movement of this air column will cause these objects to move as well.

Good conductors of Heat Poor conductors of Heat

Gain heat quickly Gain heat slowly
Increase in temperature quickly Increase in temperature slowly

Lose heat quickly Lose heat slowly
Decrease in temperature quickly Decrease in temperature slowly

Conduct heat from a warmer Conduct heat from a warmer
region to a cooler region quickly region to a cooler region slowly

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Primary 4: Rocket Science

Activity 1 – Fun facts: Why do some hot things glow?

https://www.youtube.com/watch?v=BHBAzrxipE4
Discussion Questions:
1) What is thermal energy also known as?
2) What energy is given out as firewood is burning?
3) The iron rod emitted different colours of light as it is heated up. What
are the different colours in the visible light spectrum?
4) What electromagnetic wave do you think is picked up by the sensors
in forehead thermometers? Infrared or ultraviolet?

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Primary 4: Rocket Science

Activity 2 – MCQs

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Primary 4: Rocket Science

1. Jane wanted to separate two metal cups that were stuck together.
Which of the following set-up should she use to separate the cups?

(1) hot water (2)

hot water

crushed
ice

(3) (4)

crushed
ice

hot water

()

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Primary 4: Rocket Science

2. Adeline places an ice cube on a steel tray as shown below.
ice cube

steel tray ( )
Which of the following is correct?
(1) The ice cube loses heat to the steel tray.
(2) The ice cube does not gain or lose heat.
(3) The steel tray loses heat to the ice cube.
(4) The steel tray gains heat from the ice cube.

3. Misha places a metal spoon in a cup of hot coffee.

AA ccuupp ooff hhoott ccooffffeeee
Metal
spoon

The spoon becomes hotter after a while. Which of the following explains
this?

(1) The cup loses heat to the hot coffee.

(2) The hot coffee gains heat from the spoon.

(3) The spoon gains heat from the hot coffee.

(4) The spoon loses heat to the hot coffee. ()

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Primary 4: Rocket Science

4. Gina carried out an investigation using four similar sized pieces of Material
A, each with a different thickness. The thickness of the 4 pieces W, X, Y
and Z are shown below.

WX YZ

She heated each piece until the temperature of the box reaches 40ºC.
Which of the following shows the correct sequence at which the
temperature reached 40ºC?

Longest Shortest
time taken time taken

(1) W Y Z X
(2) Y W Z X
(3) X Z Y W
(4) X Z W Y

()

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Primary 4: Rocket Science

5. Mary set up an experiment to find out if the type of material will affect the
temperature in the glass box. This is shown in the diagram below. She
recorded the temperature inside the box every 5 minutes.

Material A thermometer
glass box
heat lamp

retort
stand

Mary repeated her experiment with three other materials, B, C and D of the
same thickness.

Which of the following shows the variables that should be kept constant? A
tick () indicates that the variable should be kept constant.

Position Type of Initial Final
of lamp material temperature temperature
inside the box inside the box
(1) 
(2)   
(3)  
(4) 

()

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Primary 4: Rocket Science

6. Kavi placed Material X below a beaker of water and heated them over a
Bunsen burner as shown in the diagram. He repeated the experiment with
Materials Y and Z of the same thickness.

Beaker of water
Material X

Bunsen burner

He recorded the heat conductivity and the time taken for the water to boil in
the table below.

Material Conductor of Time taken for water to boil (min)

X heat 20
Y Good 20
Z Poor 20
Very Good

Which one of the following is most likely the volume of water that Kavisha
used to carry out his experiment?

Volume of water in beaker above material/ ml )
XYZ

(1) 200 300 400
(2) 400 200 300
(3) 200 400 300
(4) 300 200 400

(

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Primary 4: Rocket Science

7. Maruwa heated four similar pieces of iron cubes of similar size and
thickness to a temperature of 70°C. She dropped each piece into a
separate beaker of water. Each beaker contained a different amount of
water at a different temperature as shown in the diagram below.

Beaker A Beaker B Beaker C Beaker D

100 ml 200 ml 100 ml 200 ml
30°C 30°C 70°C 70°C

Which beaker would show the greatest increase in the temperature of the
water after 10 minutes?

(1) Beaker A
(2) Beaker B
(3) Beaker C
(4) Beaker D

()

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Primary 4: Rocket Science

8. Four identical containers, A, B, C and D, were filled with the same amount
of water at different temperatures, as shown below. They were left in a
room with a temperature of 30°C.

ABCD

Set-ups

Temperature 7 18 30 65
(°C)

Four children made the following statements. Who made the correct
descriptions based on the above set-ups?

Ken Water in all the four containers has the same amount of heat.

Eva Water in all the four containers will finally have the same
temperature as the room.

Matt Only water in container D is losing heat to the surrounding.

Lucy Only water in containers A, B and C is gaining heat from the
surrounding.

(1) Eva only
(2) Ken and Lucy only
(3) Eva and Matt only
(4) Ken, Eva and Matt only

()

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Primary 4: Rocket Science

9. Paul filled up 4 identical basins with different amounts of water at different
temperatures. He then heated 4 identical iron blocks to a temperature of
40oC. After heating the 4 iron blocks, he dropped each block into the
beaker of water as shown below.

Basin A 25 ml of Basin B 50 ml of

water at water at
10oC 10oC

Basin C 25 ml of Basin D 50 ml of

water at water at
50oC 50oC

In which basin would the water show the greatest rise in temperature?

(1) A
(2) B
(3) C
(4) D

()

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Primary 4: Rocket Science

10. Three beakers filled with an equal amount of hot water at 90oC. They were
placed in three containers, X, Y and Z made of different materials.
Styrofoam is the poorest conductor of heat.
A thermometer was placed in each beaker and the containers were all
covered with a lid as shown below. The containers were then left on a table
for an hour.

Which graph best represents the change in the temperature of the water in
each container?

(1) (2)

(3) (4)

()

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Primary 4: Rocket Science

11. Megan put a jar of peanut butter into the fridge. The next day, she took out
the peanut butter jar from the fridge and could not open the lid. She asked
four of her friends for help. They gave her the following suggestions.

Adrian: Pour boiling water on the lid.
Betty: Put some ice cubes around the lid.
Carl: Pour boiling water on the glass bottle.
David: Put some ice around the glass bottle.

Who should Megan listen to so that she is able to open the lid of the peanut
butter?

(1) Adrian and Betty
(2) Betty and Carl
(3) Carl and David
(4) Adrian and David

()

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Primary 4: Rocket Science

12. The diagram below shows two identical bottles, X and Y, connected by a
glass tube. A drop of ink was placed in the glass tube as shown below.
Bottle X was placed into a basin of cold water but bottle Y was not.

glass
tube

drop of ink

cold
water

bottle X bottle Y

Which of the following is correct?

Direction that the drop of Explanation
ink moved towards

(1) Moves towards bottle X The cold water in the basin lost heat
and contracted.

(2) Moves towards bottle X The air in bottle X lost heat and
contracted.

(3) Moves towards bottle Y The air in bottle Y gained heat and
expanded.

(4) Moves towards bottle Y The air in bottle Y lost heat and
contracted.

()

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Primary 4: Rocket Science

Activity 3 – Open-ended Questions
1. Fatimah had 2 similar plastic bags of ice. Bag A contained a block of ice

and Bag B contained a bag of ice cubes. The block of ice and the ice cubes
had the same volume. She left them on the kitchen table and returned 10
minutes later.

block of Ice cubes
ice

Bag A Bag B

(a) Which bag of ice would completely melt first? [2]
Give a reason for your answer.

_______________________________________________________

_______________________________________________________

(b) Classify the following items in the table below. [2]

Aluminium Ice cube
spoon Hot tea

Hot coffee

Things that lose heat Things that gain heat

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Primary 4: Rocket Science

2. Dan conducted an experiment on 3 different types of materials, A, B and C.
He wrapped each material on 3 identical tins filled with 20 ml of hot water at
the same temperature and covered them with identical lids.
He measured the temperature of the water in each tin at intervals of 30
minutes for the next four hours. The temperature of the room was 25 oC.
thermometer
lid

A BC
The graph below shows the results of his experiment.

(a) Based on the graph, state the temperature of water at the start of the

experiment. [1]

_______________________________________________________

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Primary 4: Rocket Science

(b) Fill in the blanks below by arranging the materials in order of increasing

temperature after 4 hours. [1]

Material with Material with
lowest highest
temperature temperature
after 4 hours after 4 hours

(c) Based on the results collected, which of the materials should he choose

to make a sweater to keep him warm in the cold?

Explain your choice. [2]

________________________________________________________

________________________________________________________

________________________________________________________

________________________________________________________

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Primary 4: Rocket Science

3. Mr Lim put a drop of ink in the middle of a glass tubing. He then placed
the tube into two identical empty bottles.

ink glass tubing
drop

Bottle G Bottle H

candle

(a) Mr Lim placed a candle near bottle H. He observed that the drop of

ink first moved towards Bottle H. Explain his observation. [1]

________________________________________________________

________________________________________________________

(b) Mr Lim observed that after the ink moved towards bottle H, it moved

towards bottle G. Explain his observation. [1]

_______________________________________________________

_______________________________________________________

(c) Mr Lim removed the candle near Bottle H. What would he observe
about the drop of ink after some time? Explain his observation. [2]

_______________________________________________________

_______________________________________________________

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Primary 4: Rocket Science

4. Material A contains pockets of air. Material B does not contain pockets of
air. Eunice wants to study whether material A is better at keeping the water
cold for a longer period of time. She sets up her experiment as shown
below.

thermometers

rubber
covers

material 100ml of material
A cold B
water

beakers

set-up Q set-up R

She records her results for the two set-ups, Q and R, in a graph as shown
below.

(a) Which line in the graph below correctly represents the two set-ups?

Fill in the boxes with Q and R to show the correct changes in the

temperature of the water in each set-up. [1]

(b) Why did the temperature of the water in both beakers increase? [1]
________________________________________________________
________________________________________________________

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Primary 4: Rocket Science
Activity 4 – Science in daily life: Conductors of heat

https://www.youtube.com/watch?v=9joLYfayee8
Discussion Questions:
1) Which hand was burnt first? The one holding the metal rod or the glass
rod? Explain why.
2) Why is metal a good conductor of heat?
3) Which is the poorest conductor of heat? Solids, liquids or gases?
4) How does wearing a puffy air-filled jacket help a person keep warm
during a cold winter night?

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