23274913-Nexus-Pmr-Science-Form-1•2•3-Page-123-Extra-Practice
4
©Sasbadi Sdn. Bhd. i CHAPTER 7: HEAT PAPER 2: Structured Questions Instructions: Answer the following questions. Section A 1 The diagram below shows the principle of an automatic fire alarm. bimetallic strip metal contact battery electric bell (a) Name two metals P and Q that can be used for the bimetallic strip. P: _______________________________________________________________ Q: _______________________________________________________________ [2 marks] (b) i. If the metals P and Q are correctly used, what will happen to the bimetallic strip in case of fire? ____________________________________________________________ ii. Why does the bimetallic strip bend in that direction? ____________________________________________________________ [2 marks] (c) State two consequences of the action of the bimetallic strip. __________________________________________________________________ __________________________________________________________________ [2 marks] (d) Name two other instruments which make use of bimetallic strips. 1. ____________________________________________________________ 2. ____________________________________________________________ [2 marks] NEXUS PMR SCIENCE FORM 1•2•3 Page 123 (Extra Practice ) Supplementary Materials for P Q
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Transcript of 23274913-Nexus-Pmr-Science-Form-1•2•3-Page-123-Extra-Practice
©Sasbadi Sdn. Bhd. i
CHAPTER 7: HEAT
PAPER 2: Structured Questions
Instructions: Answer the following questions.
Section A
1 The diagram below shows the principle of an automatic fire alarm.
bimetallic strip
metal contact battery
electric bell
(a) Name two metals P and Q that can be used for the bimetallic strip.
P: _______________________________________________________________
Q: _______________________________________________________________
[2 marks]
(b) i. If the metals P and Q are correctly used, what will happen to the bimetallic
strip in case of fire?
____________________________________________________________
ii. Why does the bimetallic strip bend in that direction?
____________________________________________________________
[2 marks]
(c) State two consequences of the action of the bimetallic strip.
__________________________________________________________________
__________________________________________________________________
[2 marks]
(d) Name two other instruments which make use of bimetallic strips.
1. ____________________________________________________________
2. ____________________________________________________________
[2 marks]
NEXUS PMR SCIENCE FORM 1•2•3
Page 123 (Extra Practice )
Supplementary Materials for
P
Q
©Sasbadi Sdn. Bhd. ii
2 The diagram below shows an electric toaster.
(a) What principle does the toaster use?
__________________________________________________________________
[1 mark]
(b) Name another device which uses the same principle.
__________________________________________________________________
[1 mark]
(c) State one example of each of the following:
i. Heat produced by friction.
____________________________________________________________
ii. Heat produced by chemical reaction.
____________________________________________________________
[2 marks]
(d) State whether heat is absorbed or released during the following processes:
i. Condensation of water vapour to form rain
____________________________________________________________
ii. Sublimation of naphthalene balls
____________________________________________________________
[2 marks]
(e) State two uses of heat in medicine.
1. ____________________________________________________________
2. ____________________________________________________________
[2 marks]
NEXUS PMR SCIENCE FORM 1•2•3
Page 123 (Extra Practice )
Supplementary Materials for
©Sasbadi Sdn. Bhd. iii
Section B
3 The diagram below shows an experiment being carried out.
boiling water 100°C copper rod aluminium rod iron rod wooden rod carbon rod
glass rod thumbtack
(a) What do you think is the aim of the experiment?
__________________________________________________________________
[1 mark]
(b) State three factors that must be kept constant in the experiment.
1. ____________________________________________________________
2. ____________________________________________________________
3. ____________________________________________________________
[3 marks]
(c) What variable is manipulated in the experiment?
__________________________________________________________________
[1 mark]
(d) What is the function of the thumbtacks?
__________________________________________________________________
[1 mark]
(e) State three inferences that you can draw from the results of the experiment.
1. ____________________________________________________________
2. ____________________________________________________________
3. ____________________________________________________________
[3 marks]
NEXUS PMR SCIENCE FORM 1•2•3
Page 123 (Extra Practice )
Supplementary Materials for
©Sasbadi Sdn. Bhd. iv
4 The diagram below shows an experiment in progress.
thermometer boiling water
100°C
cotton wool cloth
(a) Suggest a hypothesis for the experiment.
__________________________________________________________________
[1 mark]
(b) State two factors that must be kept constant in the experiment.
1. ____________________________________________________________
2. ____________________________________________________________
[2 marks]
(c) What variable is manipulated in the experiment?
__________________________________________________________________
[1 mark]
(d) What is the function of the thermometers?
__________________________________________________________________
[1 mark]
(e) The temperature of the water in which flask will fall faster?
__________________________________________________________________
[1 mark]
(f) What conclusion can you draw from the result of the experiment?
__________________________________________________________________
[1 mark]
NEXUS PMR SCIENCE FORM 1•2•3
Page 123 (Extra Practice )
Supplementary Materials for
