THURSAY FEVA 1

7/28/2019 THURSAY FEVA 1

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Copper rod15cm

Glass rod15cm

Iron rod15cm

1

Name of Student :_________________________________

Teachers Name MR. CHRISTOPHER

Class : F1A

Lesson : L61

Date : 25.10.2012Time : 8.15AM-9.25AM

SEKOLAH MENENGAH SERI OMEGA JOHOR BAHRU

Subject : Science

Chapter / Topic : Heat

Sub-Topic : R.E.V.I.S.I.O.N

1 The diagram shows an experiment to investigate transfer of heat using threeconductors. Each rod is heated until the thumb tack drops. The time taken for thethumb tack to drop is recorded.

Arrangement of apparatus Time taken

60 seconds

120 seconds

90 seconds

Which of the following shows the correct heat conduction properties of the materials inthe experiment?

Bad Good Very good

A Glass rod Iron rod Copper rod

B Iron rod Copper rod Glass rod

C Copper rod Iron rod Glass rod

D Glass rod Copper rod Iron rod

PMR 2004


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2 The diagram shows a hanging cardboard spiral.

When a lighted candle is placed under the cardboard spiral, it spins because

A the candle displaces heat by radiationB heat from the candle is conducted upwardsC the cardboard spiral becomes lighter when the air is hotD the hot air under the cardboard spiral experiences convection

PMR 2005

3 The diagram shows a heat transfer system in a building.

Which of the following activities uses the same principle as the above diagram?

A Letting ice meltB Boiling water in a kettleC Ironing clothes with an ironD Washing clothes using a washing machine

PMR 2005

4 Houses in tropical countries are usually painted white to

A absorb heatB radiate heatC detect heatD reflect heat

PMR 2007


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5 Diagram 2 shows matter in state X changing to state Y when heat is released.

X Y

Diagram 2

Which of the following statements is true about the particles as the matter changesfrom state X to state Y?

A The kinetic energy of the particles decreaseB The distance between the particles become far apart

C The particles take the shape of the containerD The size of the particles increasesPMR 2007

6 Diagram 4 shows a fire alarm system.

Diagram 4

P, Q, R and S are steps by which the alarm works.

Choose the correct sequence of steps to make the alarm works

A R P Q SB P Q R SC R Q P SD P R Q S

PMR 2007

P Bimetallic strip expands and bends

Q Bimetallic strip touches the contact screw and the circuit is complete

R The fire increases the room temperature

S The fire alarm bell rings


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7 Diagram 5 shows the heating of three metal rods P, Q, and R.A thumb-tack is attached at the end of each rod by a layer of plasticine.

Diagram 5

The time taken for the thumb-tacks to drop is recorded in Table 3.

Thumb-tack at P Thumb-tack at Q Thumb-tack at R

Time/s 150 210 90

Table 3

Which of the following shows the metals in ascending order of their conductivity ofheat?

A Q, R, PB R, Q, PC P, Q, RD Q, P, R

PMR 2007


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SECTION B : SUBJECTIVE QUESTIONS

8 Diagram 5 shows two identical glasses, P and Q, which are stuck together.

Diagram 5

Glass Q is dipped into the hot water for a few minutes.What makes the glasses able to be separated easily?

A Glass Q contracts more than glass PB Glass Q expands more than glass PC Glass Q and glass P expand at the same rateD Glass Q and glass P contract at the different rate

PMR 2008


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1 (a) Diagram 6.1 shows a thermometer used in a laboratory. (PMR 2008)

Diagram 6.1

What happens to the mercury when the bulb is placed in hot water?

____________________________________________________________________(1 mark)

(b) Diagram 6.2 shows the condition of a bimetallic strip in a heating process.

Diagram 6.2

Why does the bimetallic strip bend when heated?

____________________________________________________________________

____________________________________________________________________(1 mark)


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(c) Diagram 6.3 shows a fire alarm system.

Diagram 6.3

(i) When there is a fire, the bimetallic strip bends.

In the coloured region provided in Diagram 6.3, draw an arrow to show thedirection of the bending of the strip.

(ii) Explain how the fire alarm works when the bimetallic strip is heated.

___________________________________________________________

___________________________________________________________

___________________________________________________________(2 marks)


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(d) Diagram 6.4 shows a method to remove a very tight metal cap of a bottle.

Diagram 6.4

Why do we use hot water to remove the tight metal cap easily?

____________________________________________________________

____________________________________________________________

____________________________________________________________(1 mark)

(e) Diagram 6.5 shows some electrical cables.

Diagram 6.5

(i) What happens to the electrical cables during cold weather?

____________________________________________________________(1 mark)

(ii) Giveone reason for the answer in 6(e)(i).

____________________________________________________________

____________________________________________________________(1 mark)


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2. Diagram 1.1 shows the physical changes in the state of water.

(a) Name processes X and Y in Diagram 1.1 using the following words

[2 marks]

(b) Diagram 1.2 shows the drying of clothes under the sun.

(i) Name the physical process shown in Diagram 2.1.

[1 mark]

Melting Boiling Condensation

Diagram 1.2

Y : ....

Ice

Steam

Process Z

X : ....

Diagram 1.1


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(ii) Draw the changes in the arrangement of particles during this process.

[2 marks]

(iii) State whether heat is absorbed or released during this process.

__________________________________________________

[1 mark]

3. Diagram 2.1 shows an activity involving different ways of heat flow from a fire.

(a) State the ways of heat flow in Diagram 2.1 using the following information.

[2 marks]

(b) Draw the direction of heat flow from the hot pot to the hand in the box provided inDiagram 2.2

Radiation Convection Conduction

Y : .

Diagram 2.1

Z :

X :


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[1 mark]

4. Diagram 3.1 shows an activity that is carried out to study the effect of heating on a metalball.

(a) What can be observed when the heated metal ball is placed on the ring?

[1 mark]

(b) What happens to the particles in the metal ball when the metal ball is heated?

.

[1 mark](c) Draw the changes in arrangement of particles when the metal ball is heated.

metal ball

ring

metal ball

ring

Before Heating After Heating

Diagram 3.1

Before HeatingAfter Heating

Diagram 2.2


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[1 mark]

(b) Diagram 4.2 shows an experiment to study the absorption of heat by differentsurfaces. The apparatus is being heated for 5 minutes and the thermometer readingin each minute is recorded in the table 4.3 below. The final thermometer reading isshown.

Time of heating,

t (minutes)

Reading of thermometer X

T, (C)

Reading of thermometer Y

T, (C)

0 35 35

1 36 35

2 38 36

3 40 36

4 42 37

5

Table 4.3

(i) State the following variables.

Controlled variable : _________________________

Manipulated variable: _________________________

Diagram 4.2

40 35


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Responding variable: _________________________

[3 marks]

(ii) State the hypothesis of this experiment._____________________________________________________________________________________________________________________________________

[1 mark]

(iii) Record the temperature reading in the table 4.3.[1 mark]

(iv) Based on the information in Table 4.3, plot a graph to show the relationshipbetween the time of heating, t and the thermometer reading.

[2 marks]

(v) Based on the graph, what is the relationship between the time, tand thetemperature, T?

________________________________________________________________

________________________________________________________________


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[1 mark]

(vi) Predict what will happen to the thermometer X reading after 5 minutes.______________________________________________________________________________________________________________________________________

[1 mark]

5. Diagram 5.1 shows an activity to compare the heat conductivity of three different metalrods, P, Q and R.

The rods are heated equally at one end. The time taken for the thumbtacks to drop isgiven in Table 5.2.

Metal rod Time taken for thumbtacks to drop (s)

P 90

Q 150R 110

Table 5.2

(a) How is heat transferred through the metal rods?

[1 mark]

(b) (i) Which metal rod transfer heat the fastest?

[1 mark]

(ii) Explain your answer in (b)(i).

.

[1 mark]

Rod P

Rod Q

Rod R

WaxThumbtack

Diagram 5.1


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(c) Arrange P, Q and R according to their heat conductivity in ascending order.

[1 mark]

(d)(i) Which of the metals, P, Q, or R is the best material for making a frying pan?

.

[1 mark]

(ii) Give one reason for your answer in (d)(i).

.......................................[1 mark]

THURSAY FEVA 1

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