Mark scheme for IGCSE Physics (0625/2) – Core Theory May/June 2000
1(a)weight1
(b)mass1
(c)greater density OR less air gaps between potatoes1
3
2(a) Any three from:
conduction
convection
radiation evaporation 3
(b)(i)suitable procedure1
(ii)correct form of heat loss for candidate’s procedure1
5
3(a)wind wire round iron bar1
both ends of coil connected to battery1
extra valid point e.g. cut off length of wire, strip ends etc.1
(b)suitable check e.g. picking up iron(filings)
deflects compass needle
repels another magnet
move into coil connected to galvanometer1
4
4(a) refraction (allow slowing down of light/ angle of refraction)1
(b)(i)normal correct, by eye1
(ii)i “correctly” shown between candidate’s normal and ray1
(c) (i)refraction away from normal1
along ST1
(ii)1. (total internal) reflection1
2.angle in water> critical angle1
7
5(a) idea that light travels faster than sound1
extra detail
e.g. light travels extremely fast / much faster than sound /
instantaneously / at 3x 108 m/s 1
(b)(i) echo OR equivalent1
(ii)idea of absorption of sound / dispersion / diffraction /
sound has travelled further / lower air density at altitude1
(c)speed = distance/time in any form 1
(distance = ) approximately 330 x 41
1320(m) 1
7
6(a)(i)smoke particles ticked1
(ii)3rd box ticked1
(b) 4th box ticked2
4
7(a)(i) potential OR stored OR position OR gravitational (potential)1
(ii)kinetic OR motion OR movement1
(iii)turbine(s) OR coil(s) OR blade(s) OR rotor / fins / wheel1
electrical / electricity1
(b)Any two from:
waves
tides
steam
geothermal2
6
8(a)(i) 3201
(ii)candidate’s value correctly plotted ± ½ small square1
(b)(i)1601
(ii)candidate’s value correctly plotted ± ½ small square1
(c)points plotted at (60,80)and (80,40) ± ½ small square 1
(d)smooth curve through candidate’s points, by eye1
(e)either of last two boxes ticked1
(f)randomness OR idea of background1
8
9(a)(i)D1
(ii)large(st) area 1
least pressure / pressure more spread out1
(b)increasesdecreases stays the same
length AB√
width BC√
thickness CD√1
area touching the
horizontal surface√1
mass of sheet√1
weight of sheet√1
density of metal√1
pressure on surface √1
9
10(a) R = V/l in any form1
12/1.51
8Ω1
(b)(i)12(V)1
0.75(A)1
(ii)16(Ω) OR 2 x candidate’s (a), correctly evaluated1
(c) (i)16 (Ω/m) OR candidate’s (b)(ii)1
(ii)64/candidate’s(ci)1
4 (m)OR 64/candidate's (ci) correctly evaluated1
9
11(a)sound1
(b)infra-red1
(c)X-rays1
(d)(i) no air / vacuum on the moon implied1
1. sound needs a medium/air1
2. radio waves don’t need a medium/air1
(ii)radio / μ wave1
7
12(a)(i)B1
(ii)greater force / weight / heavier1
reference to formula or constancy of length1
(b)(i)B1
(ii)greater weight / force / heavier1
reference to formula or constancy of height lifted1
(c)weight (of hammer) OR mass OR force1
time (to lift)1
(d)(i)energy of motion OR K.E.1 (ii) Any two from:
heat. OR frictional
sound
K.E. of nail2
11
1