Paper 4 Jun 2001 Physics

Answer guide for O Level Physics (5054/4) – Paper 4 Alternative to Practical June 2001

Four entries correct (15,30,45,60) Only three correct (1) 30 and 45 (Candidates can be credited if their answers follow correctly from any errors made in the table) time against mass or mass against time Answer expresses the idea for the need for interpolation and that the reading should be taken at time = 7.7

2

2(a) (b)

By putting different amounts of water in the bottle Vb or 450 (units are not essential)

1

(c)

Tabulation: minimum with two columns and space for two headings 1 VA, f 1 Includes VW or identifies space for repeats 1

1(a) (b) (c)(i) (ii)

3(a) (b)(i) (ii)

(c)

4(a) (b) (c)

(d)

Page 1 of 2

1 1 1 1

1

Acceptable units for each (main) column (not litres or pints)

1

To reduce error or improve accuracy 17.3 and 19.4 In the context of Table 2 the same change in I

1 1

does not produce the same change in N (or change in N not proportional to I) Any two from: An error in trial 1 or 2 Clips not uniform Some clips not free to move Position of nail clips different in the trials Residual magnetism in the clips

-10 to 110 (unit not essential) or 120 Two correctly placed labels BP increase as the mass / more salt increases or as salt dissolves/ is absorbed / added Saturation / no more dissolving at P (or Q) The BP would change according to the amount of impurity present or in steam the temperature is 100 oC

© UCLES 2002

1 1

2

1 1 1 1 1 1

Answer guide for O Level Physics (5054/4) – Paper 4 Alternative to Practical June 2001

5(a)

(b)(i) (ii)

Page 2 of 2

Correct axes, identified Acceptable scale with unit Correct plots Neat line with good judgement Heat slowly / gently / stir / until readings are stable / thermometer close to thermistor By not viewing the thermometer at right angles to the reading

© UCLES 2002

1 1 1 1 1 1