8/14/2019 Paper 3 Nov 2000 Physics

1/2

Answer guide for O Level Physics (5054/3) Paper 3 Practical Test November 2000

Page 1 of 2 UCLES 2002

1(a) (Setting up apparatus no answer required)

(b)(i) Number of spheres used = 10 1

(ii) & (c) Volumes recorded with unit and correct calculation of V

s

giving a

value of between 1.8 cm

3

and 2.2 cm

3

i.e. V

s

= (V

T

50)/(Number ofspheres) 1

(d) & (e) Masses recorded with unit appearing at least once and correct

calculation of m

s

= (m

T

- m

D

)/10 1

(f) Correct calculation of density, 2/3 s.f. and unit 1

Value 2.25 g / cm

3

to 2.74 g / cm

3

from correct calculation 1

2(a) Correct general arrangement with horizontal line lying between the

top of (b) and the bottom of (d) on page 5 and with the object pinlabelled as O and 8.0 0.2 cm from the horizontal line 1

(b) X and Y labelled and clear that these have been made by pin

holes and in approximately the correct position as judged by eye.

Ray completed from M to O. 1

(d) Rays extended back correctly and meeting at I which must be

labelled. 1

All rays complete with I greater than 7 cm but less than 9 cm from

horizontal line. 1

3(a) Diagram showing correct symbols for power supply, (switch),

variable resistor, lamp and (milli)ammeter in series, with voltmeter

in parallel with lamp 1

(b) I = 40 mA and V approximately 3 V both with units 1

(c) Correct calculation of R giving sensible value(approximately 80

) 1

(d) I = 50 mA and new V greater than answer at (b) with correct

calculation of R. Units required for I, V and R. 1

(e) Increased temperature of wires gives increased resistance 1

8/14/2019 Paper 3 Nov 2000 Physics

2/2

Answer guide for O Level Physics (5054/3) Paper 3 Practical Test November 2000

Page 2 of 2 UCLES 2002

4(a) (setting up apparatus no answer required)

Readings

(b) Reasonable value with unit 1

(c) (setting up apparatus no answer required)(d) Table with units for

and t 1

Evidence of at least one temperature to better than 1 o

C 1

At least 8 readings over a time of 8 minutes 1

1/2 minute intervals used at least once provided there are more than

8 readings 1

Majority of points form a smooth curve 1

Graph

(e) Axes labelled with units and

plotted against t

1

Data occupies

10 cm vertically and scale does not involve 3,6,7 or

9 1

Minimum of 5 points plotted ( or all points if data gives < 5 points)

and the two furthest from the curve correct provided scale does not

involve 3, 6, 7 or 9. 1

Fine line drawn with pencil which is a reasonable fit to the points

and fine points or crosses. 1

(f) Straight line through t = 4 minutes or tangent between t = 3.5

minutes and t = 4.5 minutes or straight line which would be parallel

to the above tangent 1Correct calculation of the gradient as determined by correct reading

of the sides of the triangle with a base

8.0 cm and from a

reasonable straight line 1

(g) Correct calculation of power using candidates gradient 1

2 or 3 s.f. 1

Value between 1200 J / minute (20 W) and

3000 J / minute (50 W) with unit and positive answer 1