Electricity Question

8/2/2019 Electricity Question

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CHAPTER 7 ELECTRICITY PAPER 1

1. When the switch is on, the current that flows in an electronic advertisementboard is 3.0 x 10 -5 A. What is the number of electrons flowing in theadvertisement board when it is switched on for 2 hours ?

[ Charge of an electron is = 1.6 x 10 -19 C]SPM 2004

A 3.84 x 10 11

B 1.67 x 10 14

C 1.35 x 10 18

D 4.17 x 1023

E 1.50 x 10 27

2. The electric current supplied by a battery in a digital watch is 3.0 x 10 -5 A.What is the quantity of charge that flows in 2 hours ?

SPM 2005

A 2.5 x 10 -7 CB 1.5 x 10 -5 CC 6.0 x 10-5 CD 3.6 x 10-3 CE 2.2 x 10-1 C

3. Which diagram shows the correct electric field pattern ?SPM 2003

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4. Which graph shows the relationship between potential difference , V , andcurrent , I , for a resistor that obeys Ohm s law ?

SPM 2003

5. Which circuit can be used to determine the resistance of a bulb ?SPM

2003

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6. The diagram shows a circuit containing four bulbs A, B ,C and D, which are lit atnormal brightness. When a bulb is faulty ,no current will flow through it.

Which bulb , when faulty will cause all the bulbs not to light up ?SPM 2004

7. All the bulbs below are identical.SPM 2004

Which of the following statements is true ?A Reading of A1 > A 2 > A3B Reading of A1 > A3>A2C Reading of A2>A1>A3D Reading of A3>A1>A2

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8 The bulb in the circuit is lit at normal brightness when switches S1 and S2 areclosed.

SPM 2004

What happens to the brightness of the bulb if only S 1orS2 is closed ?

Only S1 is closed Only S2 is closed

A Increases Decreases

B Increases IncreasesC Decreases IncreasesD Decreases Decreases

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9 The electromotive force and internal resistance of the dry cell in the circuit belowis 1.5 V and 0.5 respectively.

SPM 2004

What is the reading of the voltmeter when the switch is closed ?A 0 VB 1.5 VC Less than 1.5 VD More than 1.5 V

10. Which circuit can be used to determine the electromotive force of a battery ?SPM 2005

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11 The diagram shows a bird perched on a high voltage cable.SPM 2005

The bird does not experience an electric shock because

A the potential difference across X and Y is highB the resistance of the cable across X and Y is very highC the body of the bird has a low resistanceD the current flowing through its body is very small.

12. The table shows the electrical energy consumption tariff.

Calculate the cost in RM of using a 1.5 kW refrigerator for 360 hours.

A 84.00B 90.00

C 118.80D 129.00E 135.00

SPM 2007

13. Which of the following factors does not influence the resistance of a wire ?

A Length of the wireB Material of the wireC Cross-sectional area of the wire

D Hardness of the wire

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14 Diagram 21 shows a parallel circuit. R 1 is not equal to R 2.

Which physical quantity must be the same for both R 1 and R 2 ?

A PowerB Current

C VoltageD Energy

15 Diagram 22 shows an electric circuit.

Calculate the internal resistance of the battery in this circuit.

A 0.06 B 0.07 C 0.25 D 3.75

16 An electric appliance has been switched on for 2 hours. Calculate the quantity ofelectric charge passing through the circuit in this time if the current is 2 A.

A 4 CB 120 C

C 240 CD 14400 C

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PAPER 2 ( SECTION A)

SPM 2006

1. Diagram 1.1 shows an electric circuit.

(a) (i) Name instrument Q

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

(ii) What is the function of R in the circuit ?.........................................................................................................

[1 mark](b) Diagram 1.2 show two types of ammeters , X and Y , that can be used in the

circuit in Diagram 1.1

(i) Which ammeter is more sensitive ?...............................................................................................................

[1 mark](ii) State one reason for your answer in 1 (b) (i) .

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

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SPM 2004

Figure 8.1 shows an immersion heater with specification of 240 V , 1000 W.

(a) Name one suitable material to be used as a heating element in the immersionheater.

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

[ 1mark]

(b) The immersion heater is connected to a 240 V supply.Calculate ;

(i) the current that passes through the immersion heater ,

[2marks]

(ii) the resistance of the immersion heater.

[ 2marks]

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(c) A student conducts an experiment to compare the heating effect ofimmersion heaters P ,Q and R. The volume and initial temperature of thewater is fixed.Table 8.1 shows the result of the experiment.

Immersionheater

Potential difference /V

Current / A Time for the water tostart boiling / minute

P 240 6.0 8.0

Q 240 5.0 10.0

R 240 4.0 9.0

(i) State the energy change that occurs when the immersion is switched on....................................................................................................................

.[1 mark]

(ii) Calculate the energy supplied by each of the immersion heaters P ,Q andR to start boiling the water.

[ 4 marks]

(iii) Using your answer in (c) (ii) , suggest which immersion heater is the mostsuitable to heat water. Give one reason for your answer.

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

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

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

[2 marks]

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SPM 2007

Diagram 6 show a lighting circuit of a house.

(a) (i) Underline the correct answer in the bracket to complete the sentence below.The bulbs in Diagram 6 are connected in ( series , parallel )

(ii) What will happen to the other bulbs if one bulb blows ?

[1 mark]

(b) All the bulbs in Diagram 6 are labeled `240 v, 60 W

(i) What is meant by 240 v, 60 W ?

[1 mark]

(ii) Calculate the current in the circuit when only one bulb is lit.

[1 mark]

(iii) Calculate the total resistance of the circuit when all bulbs are lit

[3 marks]

(iv) How can the bulbs be connected to increase the total resistance of thecircuit ?

[1 mark]

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PAPER 2 (SECTION B)

SPM 2003Figure 16 and Figure 18 show photographs of two circuit. Each circuit contains fouridentical bulbs connected to four identical new dry cells.

(a) (i) State the energy transformation that take place in the bulb [ 1 mark]

(ii) Draw a circuit diagram for each photograph. [ 3 marks]

(b) (i) Observe the photographs in Figure 16 and Figure 17. Compare the brightnessof the bulbs.

Relate the brightness of the bulbs between Figure 16 and Figure 17 to deduce aconcept in physics with regard to the potential difference and the current flow for thebulbs in series and parallel circuits.

[6 marks]

(c ) Figure 18 shows a model of an incubator used to hatch eggs. The temperature in

the incubator must be maintained around 39 C. Every part of the eggs must receiveuniform heat. The eggs are hatched in about 20 days.

Using an appropriate concept in physics , explain the modification required to theabove incubator so as to efficiently hatch about 200 eggs. [ 10 marks]

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Electricity Question