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The following information may be useful. The symbols have their usual meaning.

1

1. a =t

uv

1. v2 = u2 + 2as

2. s = ut+2

1at2

3. Momentum = mv

4. F = ma

5. Kinetic energy = mv2

6. Gravitational potential energy = mgh

7. Elastic potential energy =2

1Fx

8. Power,P= energy

time

9. =V

m

10. Pressure, p=hg

11. Pressure,p=A

F

12. Heat, Q = mc

13. Heat, Q = m

14. P1V1 = P2V2

15. V1 = V2T1 T2

16. P1 = P2T1 T2

17. T

PV

= constant

18. n =r

i

sin

sin

20. n = real depth

apparent depth

21. vuf

111+=

22. Linear magnification, m = v

u23. P = 1/ f

24. v = f

25. =D

ax

26. Q =It

27. E = VQ

28. V = IR

29. E = V + Ir

30. Power,P = VI

31.P

S

P

S

V

V

N

N=

32. Efficiency =PP

SS

VI

VIx 100%

33. eV = mv2

34. E = mc2

35. g= 10 ms-2

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Section B

[16 marks]

1. A student carries out an experiment to investigate the relationship between the

potential difference, V, across a wire and the length,L, of the wire.Diagram 1.1 shows the circuit used in the experiment.

DIAGRAM 1.1

A constantan wire of length, L = 20.0 cm is connected between P and Q. When theswitch is on, the rheostat is adjusted to obtain a current of 0.20 A. The potential

difference, Vacross the wire is measured by a voltmeter. Diagram 1.2 shows the

reading of the voltmeter.

The procedure is repeated with constantan wire of lengths, L = 30.0 cm, 40.0 cm,

50.0 cm and 60.0 cm. The corresponding readings of the ammeter and voltmeter are

shown in Diagrams 1.3, 1.4, 1.5, 1.6 and 1.7. For each step, a current of 0.20 A wasused.

L = 20.0 cm L = 30.0 cm

DIAGRAM 1.2 DIAGRAM 1.3

2

VV

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L = 40.0 cm L = 50.0 cm


L = 60.0 cm L = 60.0 cm


(a) For the experiment described on page 3, identify:

(i) the manipulated variable

.

[1 mark]

(ii) the responding variable

...

.

[1 mark](iii) a fixed variable

3

V V

V V

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.

[1 mark](b) What is the use of the strip of mirror next to the scale of the voltmeter?

.

.[1 mark]

(c) Based on Diagrams 1.2, 1.3, 1.4, 1.5, 1.6 and 1.7 on page 4, determine the

potential difference, V for the corresponding lengths of wire,L.

Tabulate your results forL, and Vin the space below.

[5 marks]

(d) On the graph paper on Page , plot a graph ofVagainstL.

[5 marks]

(e) Based on your graph, state the relationship between VandL.

..

[1 mark]

(f) State one precaution that should be taken to obtain accurate readings ofV.

..

..

[1 mark]

4

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Section C

[12 marks]

1. Diagram 1.1 shows an electromagnet at the end of the arm of a crane lifting up

some scrap iron.Diagram 1.2 shows some pieces of scrap iron dropping off when the current in the

electromagnet is reduced.


Based on the observations on Diagram 1.1 and Diagram 1.2 and using yourknowledge of the electromagnet:

(a) State one suitable inference. [1 mark]

(b) State one hypothesis that could be investigated. [1 mark]

(c) With the use of apparatus such as a solenoid, direct current power supply, paper clips and other apparatus, describe an experiment to investigate the

hypothesis stated in 1(b).

In your description, state clearly the following:

(i) The aim of the experiment.(ii) The variables in the experiment.

(iii) The list of apparatus and materials.

(iv) The arrangement of the apparatus.(v) The procedure used in the

experiment.

Describe how to control and measure the manipulated variables and how

to measure the responding variables.(vi) The way to tabulate the data.

(vii) The way to analyse the data.

[10 marks]

5

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END OF QUESTION PAPER

6

f5 sem 1

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