Page 758 - SUBSEC October 2017_Neat

-2- 02238032/SPEC/K/MS/JUNE 2017

PHYSICS
UNIT 2 — PAPER 032
MARK SCHEME

Question 1

KC UK XS
(a) Table 1: Results of Experiment

Mass of calorimeter 0.62 kg 1 2
Mass of calorimeter + 0.85 kg
water
Mass of added water, m 0.23 kg
Resistance of heating 20.8Ω
resistor, R
Time interval, Δt 15 mins = 900s

2 XS for accurate recording of ALL results in Rows 1 – 4
(Deduct 1 XS if any row is incorrect.)

1 UK for accurate recording of result in Row 5.
[3 marks]

(b) Further results of experiment

Vpk Ti Tf ΔT = Tf (Vpk/√2
(volts) - Ti ) 2
30 27.0 50.2 23.2 450
25 28.3 44.4 16.1 313
20 28.5 38.8 10.3 200
15 29.3 35.1 5.80 113
10 28.4 30.9 2.50 50.0
2 2
For Columns 1 -3, award 2 XS for sensible results and
correct sig. figs

For Columns 4 and 5 calculations, award 2 UK for correct
results, deduct 1 mark for each error
[4 marks]

(c) Plotting of Graph

Suitable scales (1) 4
Labelled axes (quantity and unit)(1)
All points accurately plotted (1)
Best-fit straight line(1)
[4 marks]

(d) Slope S, measured from graph = . . = 0.051 º /
.
correct read off of points (1 XS) 1 1
correct calculated value (1 UK)
[2 marks]