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TINGKATAN 1

CHAPTER 7: HEAT

1. Diagram 1 shows the apparatus set up in an experiment to investigate the transfer of

heat through three metal rods.

Rajah 1 menunjukkan susunan radas dalam satu eksperimen untuk menyiasat

pemindahan haba bagi tiga rod logam.

Diagram 1

Rajah 1

Table shows result of the experiment.

Jadual menunjukkan keputusan eksperimen itu.

Type of rod

Jenis rod

Time taken for the thumbtacks to fall

Masa yang diambil untuk paku tekan jatuh

X 120 s

!0 s

" 200 s

a# $ame the process by which heat flows through the metal rods.

Namakan proses haba mengalir melalui rod-rod logam.

%eatedDipanaskan

&ax ' lilin

Thumbtack((aku tekan

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...................................))))))))))))))))))))))))).

*1 mark+

[1 markah]

,b# ,i# -rrange all the rods accordingly from heat flows the worst to the heat flows the

best.

Susunkan rod mengikut kekonduksian haba yang baik dalam urutan menaik.

od )))))))../ od )))..)))../ od ))).))).

*1 mark+[1 markah]

,ii# xplains your arrangement.

Nyatakan sebab bagi susunan itu.

))))))))))))))))))))))))))))..

))))))))))))))))))))))))))))..

*1 mark+[1 markah]

,c# ,i# od X/ rod and rod " are metals.

ounded the metal rod which is the most suitable in making cooking utensils.

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Rod ! rod " dan rod # adalah logam.

$ulatkan logam rod yang paling sesuai dijadikan alat untuk memasak.

od X od od "

*1 mark+[1 markah]

,ii# xplains your choice.

%erangkan sebab bagi pilihan anda.

)))))))))))))))))))))))))))))..

)))))))))))))))))))))))))))))..

))))))))))))))))))))))))))))).

*2 mark+[& markah]

(Aras: R: 2, S: 3, T: 1)

Jawapan:

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$o. -nswer ark

1 a# onduction

b# i. "/ X/

ii. The time taken for thumbtack in fall the fastest

c# i.

od X od od "

ii. od is a good conductor of heat.

The heat will reach the food faster.

1

1

1

1

11

Total 3

2. Diagram 2 show an experiment carry out by a student to study the effect of

colour on an ob4ect in the absorption of heat.

Rajah& menunjukkan satu e'periment yang dijalankan oleh seorang pelajar untuk

mengkaji keupayaan menyerap haba bagi (arna objek berbe)a.

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Diagram 2Rajah &

,a# 5tate what will be observed after 6 minutes7

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*1 mark+

[1 markah]

,b# &hat will happen to the air inside the flask when heated7

)))))))))))))))))))))))))))))))))..

*1 mark+

[1 markah]

,c# %ow is the heat being transferred from the lighted bulb to the flask7

)))))))))))))))))))))))))))))))))..

*1 mark+

8lack surface

*ermukaan hitam

-ir

+dara

-ir

+dara

5ilver surface

*ermukaan perak

&ater

,ir

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[1 markah]

,d# 5tateoneother method of heat transfer.

)))))))))))))))))))))))))))))))))..

*1 mark+[1 markah]

,e# &hy do manufacturers make fuel storage tanks shiny and smooth7 xplain.

))))))))))))))))))))))))))))))))))

))))))))))))))))))))))))))))))))))

*2 marks+

[& markah]

(Aras: R: 4, S: 1, T: 1)

Jawapan:

$o. -nswer ark

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2 a# -ir bubles released.

b# xpand.

c# adiation.

d# onduction '' onvection

e# 5hiny surfaces is not a good absorber of heat.

5o/ the shiny storage tank will be less hot.

1

1

1

1

1

1

Total 3

9. Diagram 9.1 shows two students in a hot sun wearing a black shirt and a white shirt.

a4ah 9.1 menun4ukkan dua pela4ar di tengah terik matahari dengan memakai ba4u

berwarna hitam dan ba4u berwarna putih..

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5ituation - 5ituation 8 5ituasi - 5ituasi 8

Diagram 9.1

Rajah .1

a# i# 8ased on the observations given/ state the difference in the amount of heat

absorbed by the student in 5ituation - and 5ituation 8.

$erdasarkan pemerhatian ! nyatakan perbe)aan jumlah haba yang dserap

oleh pelajar dalam situasi , dan situai $.

))))))))))))))))))))))))))))))))

*1 mark+[1 markah]

ii# 5tate one hypothesis based on the observation in ,a# ,i#.

$yatakan satu hipotesis bagi pemerhatian anda dalam ,a# ,i#.

)))))))))))))))))))))))))))))))))

*1 mark+

[1 markah]

b# Diagram 9.2 shows the apparatus set:up to investigate the effect of heat on

different surfaces.

Rajah.& menunjukkan susunan radas untuk mrnyiasat kedan haba ke atas

permukaan berbe)a.

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Diagram 9.2

Rajah .&

ecord the temperature readings in Table 1.

Rekodkan baaan suhu pada Jadual 1.

;nitial temperature Tin = ...... > Tin X= ))> Tin = ...... >

omplete Table 1 by recording the temperature readings for the respective tin.

/engkapkan Jadual1 dengan merekodkan baaan suhu bagi setiap tin.

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Tin

Temperature ' 0

5uhu ' 0

;nitial

*ermulaan

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X

Type of surface

Jenis permukaan

d# 5tate the variables involved in this experiment.

Nyatakan pembolehubah yang terlibat dalam eksperimen ini.

ises temperature>

0enaikan suhu 2

3

6

?

9

2

1

0

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anipulated variable

*embolehubah manipulasikan

esponding variable

*embolehubah bergerak balas

ontrolled variable

*embolehubah dimalarkan

*9 marks+

[ markah]

e# 8ased on the experiment/state the relationship between the brightness of the

surface and the amount of the heat absorbed.

$erdasarkan eksperimen! nyatakan hubungan antara keerahan permukaan dan

kuantiti haba yang diserap.

)))))))))))))))))))))))))))))))))).)

))))))))))))))))))))))))))))))))))).

*1 mark+

[1 markah]

(Aras: R: , S: 3, T: 2)

Jawapan

$o. -nswer ark

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9 a# i. 5tudent situation - absorbed heat more that student

situation 8

ii. The darker the colour of the dress/ the more the heat

absorbed.

;nitial

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Diagram ?

Rajah 3

a. i. &hich thermometer shows a higher reading at the end of experiment 7

%ermometer manakah menunjukkan baaan yang lebih tinggi di akhir

eksperimen 4

))))))))))))))))))))))))))))))))

*1 mark+

[1 markah]

ii. Cive one reason for your answer in a , i #.

$erikan satu sebab bagi ja(apan anda di a 5i6.

))))))))))))))))))))))))))))))))

)))))))))))))))))))))))))))))))).

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*1 mark+

[1 markah]

b. %ow does heat from the bunsen burner reach thermometer 7 $agaimanakah haba daripada penunu $unsen sampai ke thermometer 4

))))))))))))))))))))))))))))))))..

*1 mark+[1 markah]

c. During a hot day/ "anita chooses to wear a white wear instead of a black shirt .

xplain how this helps "anita from feeling too hot.

Semasa uaa panas! #anita memilih untuk memakai pakaian ber(arna putih

daripada memakai pakaian ber(arna hitam.

Jelaskan bagaimana ini dapat membantu #anita dai tidak merasa terlalu panas.

)))))))))))))))))))))))))))))))))).

)))))))))))))))))))))))))))))))))).

*1 mark+[1 markah]

d. alaysia is one of the states that situated at the hot region. 5uggest and explain a

method how the people in tropics can kept their house cool based on the concept

of !ea" ra#$a"$on.

Malaysia merupakan Negara yang terletak dalam iklim padas. 2adangkan dan

jelaskan ara digunakan oleh penduduknya menjadikan rumah mereka lebih sejuk

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? a# i. Termometer (.

ii. Dark and dull surfaces is a good absorber of heat

b# 8y radiation.

c# &hite shirt is a bad absorber of heat.

d# i. (aint the house with a light colour paint

ii. ight colour surfaces absorb heat less

1

1

1

1

1

1

Total 3

6. Diagram 6 shows the apparatus set:up to study the conductivity of heat.

Rajah 8 menunjukkan susunan radas untuk mengkaji kokonduksian haba.

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Diagram 6Rajah 8

a# ,i# 8ased on observation in Diagram 6/ state the reading of stopeatch ( and into

table 6.1

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$erdasarkan pemerhatian dalam Rajah 8! nyatakan baaan jam randik * dan

R dalam jadual 8.1

eading of stopwatch

8acaan 4am randik

Time ,s#

asa ,s#

(

B 10

Eadual 6.1%able 8.1

*1 mark+

[1 markah]

,ii# ompare the time taken for the thumbtack E to fall for copper rod and iron

rod.

$andingkan masa yang diambil bagi paku tekan J untuk jatuh dari rod

kuprum dan rod besi.

)))))))))))))))))))))))))))))))...

))))))))))))))))))))))))))))))))

*1 mark+

[1 markah]

,ii# 5tate one hypothesis that can be made from this study.

Nyatakan satu hipotesis yang boleh dibuat daripada kajian ini.

))))))))))))))))))))))))))))))))...

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))))))))))))))))))))))))))))))))...

*1 mark+

[1 markah]

,iii# 5tate the variables involved in this study.

Nyatakan pembolehubah yang terlibat dalam kajian ini.

anipulated variable

*embolehubah dimanipulasi

esponding variable

*embolehubah bergerakbalas

*2 marks+

[& markah]

b# Table 6.2 shows result of the same experiment with copper and iron rod.

Jadual 8.& menunjukkan keputusan bagi eksperimen yangb menggunakan rod

kuprum dan rod besi.

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Thumbtack

*aku tekan

Types of rod

Jenis rod

$

opper

0uprum

6s 10s 16s

;ron

$esi

@s 13s 2?s

Table 6.2

Jadual 8.&

,i# 8ased on the result in Table 6.2/ state one inference about time taken for the

thumbtack to fall.

$erdasarkan keputusan dalam jadual 8.&! nyatakan satu in9erens berkenaan

masa yang diambil untuk paku tekan jatuh.

.............................................................................................................................

..............................................................................................................................

*1 mark+[1 markah]

,ii# (redict the time taken for thumbtack $ to fall if the metal rod is replacedwith the glass rod.

Ramalkan masa yang diambil oleh paku tekan untuk jatuh jika rod logam

digantikan dengan rod kaa.

)))))))))))))))))))))))))))))))

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*1 mark+

[1 markah]

(Aras: R:4, S: 2, T: %)

Jawapan

$o. -nswer ark

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6 a# i. (= 6

= 16

ii. The higher the metal heat conductivity/ the shorter

the time taken for the thumbtack to fall. ,Aive versa#

iii. The time taken for E thumbtack to fall is faster for

copper rod than iron rod .

b# anipulated variable= Type of rod.

esponding variable= Time taken for the thumbtack to fall.

c# i. Time taken for the thumbtack to fall in copper rod is

faster than in iron rod because copper conduct heat better

than iron.

ii. ore than 2? s

1

1

1

1

1

1

1

1

Total @

3. - student carried out an experiment to investigate heat release by different types of

surfaces. The initial temperature of the water in both conical flasks is @0>. The twoconical flasks X and are left to cool for 90 minutes and the temperature of the water

in conical flask X and are recorded at the end of the experiment.

Seorang murid menjalankan satu eksperimen untuk menyiasat pembebasan haba oleh

jenis permukaan yang berlainan. $aaaan a(al untuk suhu air di kedua-dua

kelalang

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kon ialah :;2 . 0edua-dua kelalang kon dan " dibiarkan untuk menyejuk selama

; minit dan suhu air untuk setiap kelalang kon dan " diatatkan pada akhir

eksperimen.

Diagram 3.1

Rajah

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Diagram 3.2Rajah

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X @0 3@ 63 ?9

@0 3F

Table 3.1

Jadual

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esponding variable

*embolehubah bergerak balas

*2 marks+[& markah]

d# ,i# 8ased on the data in Table 3.1/ draw a graph to show the relationship between the

temperature of water and time in conical flask .

$erdasarkan data di dalam Jadual

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*2 marks+[& markah]

,ii# (redict the temperature of water in conical flak after ?0 minutes.

Ramalkan suhu air untuk kelalang kon " selepas 3; minit.

......................................................................................................................................

.....................................................................................................................................

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*1 mark+

[1 markah]

,iii# 8ased on data in Table 3.1/ state one relationship between the type of surface offlask X and and the temperature of water.

$erdasarkan data di dalam Jadual

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Diagram 3.9

Rajah

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lassification

*engelasan

Jb4ect

Abjek

Cood ability to release heat

0eupayaan membebaskan haba yang baik

(oor ability to release heat

0eupayaan membebaskan haba yang

kurang baik

*2 marks+[& markah]

(Aras: R:4, S: 3, T: 3)

Jawapan

$o. -nswer ark

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3 a#

b# Temperature reading of conical flask is higher it surface is

aluminium paint.

c# anipulated variable= Type of paint.

esponding variable= Temperature of water.

d# ,i#

,ii# ;n the range of 31> : 39>

,iii# The lighter the colour surface of flask/ the highert the tempersture

of water.

,iv# %eat release is the temperature of water.

2

1

2

2

1

1

1

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e#

2

Total 12