2002 Paper

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2002-CE-PHY 2±19

± 18 ±

All Rights Reserved 2002

Go on to the next page35. Which of the above circuits can be used to find the resistance of the resistor R, by taking the ammeter and voltmeter readings ?

A. (1) and (2) only

B.

(1) and (3) only

C. (2) and (3) onlyD.

(1), (2) and (3)

A

V2 RCircuit (1)

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A

V2

RCircuit (2)

AV2

R

Circuit (3)

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2002-CE-PHY 2±20 ± 19 ±

All Rights Reserved 2002 36.

If the live and neutral wires of an electric kettle are mistakenly interchanged

inside the plug as shown above,which of the following will happen ?A.

The kettle will not operate.

B. The fuse of the kettle will blow. C.

The metal case of the kettle will still stand at a high

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potential even when the switch of the kettle is off .

D. The heating element of the kettle will still stand at a high

potential even when the switch of the kettle is off . 37.

Which of the following shows how a moving-coil galvanometer can beconverted into a voltmeter ?

A.

B. C. D.

1000

1

1000 1

Neutralwire

Livewire

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2002-CE-PHY 2±21 ± 20 ±


Go on to the next page38.

The figure above shows a model power line.An a.c. supply and two idealtransformers are used to

operate a lamp of rating µ6 V, 24 W¶.The totalresistance of the cables AB andCD is 10. If the lamp

operates at its ratedvalue, find the power loss in the cables. A.

0.4 W

B. 3.6 WC.

160 W

D. 1440 W

39.

The above diagram shows the circuit of the starter motor of a car .When thestarter switch is closed, a

small current flows through device X and a largecurrent then flows through the motor and starts it.

What is device X ?A.

a transformer

B.

a reed relayC. a thermistor

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D.

a logic gate

M Starter switch

X

A

B

C

D 6V 24 W

20 : 1 step-downtransformer 1 : 20step-up

transformer

2002-CE-PHY 2±22 ± 21 ±

All Rights Reserved 2002 40. A radioactive isotope

Th

23490

undergoes a series of decay processes to forma daughter nuclide

Pb206

82

.How many-particles and-particles have been

emitted in this decay process ?No. of -particles No. of -particles A.

6 7

B.

7 6 C.

7

8D.

87

41. Which of the following particlescannot be deflected by a magnetic field ?

A.

-particles

B. -particles

C.

neutrons

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D.

protons42.

Which of the following is/are application(s) of radioactivity ?(1)

to estimate the age of ancient remains(2)

to kill bacteria in food

(3)to transmit signals over long distancesA.

(2) onlyB.

(3) only

C.

(1) and (2) onlyD.

(1) and (3) only

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Directions:Each question below (questions 43 ± 45) consists of two statements.

Decide whether each of the two statements is true or false.If bothare true, then decide whether or not

the second statement is a correctexplanation of the first statement.Then select one option A, B, C orD

according to the following table :

1st statement2nd statementA.

TrueTrue

The 2nd statement is a correct explanation of

the 1st statement

B.

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True

TrueThe 2nd statement isnot a correct explanation

of the 1st statementC.

TrueFalse

D.

FalseTrue1st statement

2nd statement43.

Air-cushioned sports shoes canreduce the impact force acting onthe feet during jumping andrunning.

Air-cushioned sports shoes canincrease the time of impactbetween the feet and the groundduring

jumping and running.

44. A transformer can be used to stepup the power of an a.c. supply.

A transformer can be used to stepup the voltage of an a.c. supply. 45.

A lightning conductor can protect abuilding from being damagedbylightning during a thunderstorm.

As the lightning conductor and thethundercloud carry like charges,there is a strong repulsion

betweenthem.

END OF PAPER

2002-CE-PHY 2±24

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All Rights Reserved 2002 Useful Formulae inPhysics (a)

Relationships between initial velocityu, uniform accelerationa, finalvelocityv and displacement travelled s after timet :

v

u + at

= s

ut +

at =

1

22

2

22

v

u + as

= (b)

Potential energy gained by a body of massm when raised through a height

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his mgh.

(c)Kinetic energy of a body of massm moving with speedv is

12

2mv.

(d)

Power = force× velocity

(e)Equivalent resistance of two resistors R1and R2:

(i)

in serie s R +R=

1

2(ii)

in par allel

R R

R R

= +1

2

1

2(f) Power = pot ent ial difference× current

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2002 Paper