Paper 3 (Section A)

No. Answers Marks 1a i Volume of a gas or mass of a load 1

ii Pressure of a gas 1iii Temperature of a gas 1

b Mass, m (kg) Volume, V (cm3) 1/V (cm-3)0.5 9.0 0.11.0 4.8 0.21.5 3.3 0.32.0 2.5 0.42.5 2.0 0.5

7

c

Distance 20 boxes for (1.0 kg, 0.1 cm-3) and so on

5

d 1/V is directly proportional to m 1

2a i Value of V is decreases 1ii 1.00V AND must prolong the graph 2

iii Electromotive force 1

2b i m = gradient AND DRAW a triangle on a graph = (o.50-1.00)V ( 0.73-0.00) A = - 0.68 VA-1

3

ii r = -m = - (-0.68 VA-1) = 0.68 VA-1

1

2c i E = V + IrV = E – Ir = 1.00 V – (0.90 A)( 0.68 VA-1) = 0.39 V

2

ii R’=V/I = 0.39 V/ 0.90 A = 0.43 Ω

1

d - All connections must be secure/tight OR- Off the switch after readings are taken to prevent wires from heating up (resistance increase) OR- Avoid parallax error by placing the eye such that the line of view is perpendicular to the scale of the ammeter/ voltmeter

1

1/V (cm-3)

Mass, m (kg)