November 2012

GCSE Physics 5PH2H/01  Scheme – November 2012

1(a)(i)

B

(1)

1(a)(ii)

substitution

(1)

V = 0.5 x 12

evaluation

(1)

V = 6 (V)

  

1(a)(iii)

• P / ammeter reading would

increase.

(1)

• Q / voltmeter reading

would increase

(1)

They(both) would increase

for two s (2)

  

1(b) component

symbol

graph

All three lines correct for 2 s

One or two lines correct for 1

More than one line against any

box cannot score more than 1

 in total.

(2)

  

1(a)(i)

B

(1)

  

1(a)(ii) substitution

(1)

V = 0.5 x 12

evaluation

(1)

V = 6 (V)

Correct  with no working

shown gains two s.

(2)

  

1(a)(iv) (current/it) would decrease

(1)

smaller/lower/reduce/less

Ignore slowing down (1)

  

2(a) (i) B (1)

  

2(a) (ii) Any one of the following

Rocks

Food

Radon gas

Cosmic rays

Own bodies

Fall-out

Sun/stars

(1)

Plausible named food such as

coffee, brazil nut, bananas

Space

Specified medical/industrial use

of x-rays

Ignore smoke alarms, power

stations (in normal use)

(1)

  

2(a) (iii) An explanation linking

• personal circumstances such

as

geographical location

nature of their work

lifestyle

(1)

• the consequences such as

radiation from radon

gas/particular rocks/fallout

(eg Chernobyl)

greater exposure to x-rays

greater exposure to cosmic

rays

(1)

(2)

  

2(a) (iv) D (1)

  

2(b) (i) From the graph

Time taken to fall (from 120 to)

60

(1)

= 8 days

(1)

Any other suitable pair of

readings from graph

8.1, 8.2

Full s for correct

even if no working is evident

(2)

  

2(b) (ii) 2.2 (days)

(1)

between 2.0 and 2.5

2

(1)

  

2(b) (iii) Any one of the following:

• Mutation of dna

• Ionisation of cells

• (Increases risk of) cancer

(1)

damage / mutate cells

(1)

  

3(a)(i) B (1)

  

3(a) (ii) (equivalent to a) helium nucleus Two protons and two neutrons

for 2 s

helium/mass of 4 for 1

charge of +2 for 1

correct statement of any

property for 1

(2)

  

3 (b) A description to include any four

of the following

• neutron

• is captured by a U-235

nucleus

• nucleus (is) unstable

• nucleus splits

• into 2 daughter nuclei (of

similar size)

• (2 or more) neutrons are

released

• energy is released

• collides with /absorbed by

(U-235) nucleus

• metastable

• named isotopes

(4)

  

3 (c) An explanation linking

• moderator slows down

(absorbs energy from)

neutrons

• more likely to be captured

/cause fission (if it collides

with a U-235 nuclei)

Reverse argument

(2)

  

4 (a) C

(1)

  

4 a(ii) In the cloud : reason 3

(1)

At the tower: reason 2

(1)

(2)

  

4 a(iii) An explanation linking

• the charge was neutralised

(1)

• by a transfer/flow of

electrons

(1)

Discharged/ becomes zero

gained electrons / negative

charge

(2)

  

4 (b) substitution

(1)

52 = 2600 x time

transposition

time = 52 / 2600

(1)

evaluation

0.02 (s)

(1)

T = Q / I

Full s for correct

even if no working is evident

(3)

  

4 (c) An explanation linking two of the

following

• charges flow through the

metal wire

• to the ground / earth

• preventing build-up of

(excess) charge

(2)

mention of earthing

discharged / neutral

all objects at the same potential

(2)

  

5(a)(i) substitution

(1)

work done = 84 x 0.25

evaluation

(1)

21(J)

Full s for correct

even if no working is evident (2)

  

5(a)(ii) 21 J Ecf from (a)(i) (1)

  

5(a)(iii) substitution

(1)

KE = ½ x 27 x (2.3)2

evaluation

(1)

= 71.4

(which is approx 71)

V=2.29 gains two s

Reverse argument which shows

that

V = √5.3 gains two s

(2)

  

5 (a)(iv) B

(1)

Indicative Content

QWC *5(b) An explanation linking some of the following points

• kinetic energy varies during swing

• kinetic energy maximum at bottom of swing

• kinetic energy minimum at top of swing

• gravitational potential energy(gpe) varies during swing

• gpe maximum at top of swing

• gpe minimum at bottom of swing

• (continuous) interchange of KE and gpe

• total amount of energy is constant during one swing

• over a  of swings max KE and max PE decreases

• energy is dissipated/’lost’ to surroundings

• because of air resistance / friction

• amplitude/size of swings decrease ( as energy ‘lost’ to

surroundings)

ignore references to momentum

(6)

  

6 (a) (i) C (1)

  

6 (a) (ii) acceleration Recognisable mis-spellings

More than one word written

scores zero EXCEPT for the

phrase

Acceleration due to gravity

which scores 1

(1)

  

6 (b) Substitution

weight = 0.00008 x 10

(1)

evaluation

0.0008 (N)

(1)

8 x 10-4

1/1250

(2)

  

6 (c) Substitution

speed = 13 / 1.7

(1)

evaluation

7.6 (m/s)

(1)

An  which rounds to 7.6

eg 7.647

7.65

7.7

(2)

Indicative Content

QWC *6(d) A explanation including some of the following points

• drops near the top are accelerating

• due to force of gravity

• travel a greater distance in given time

• there is air resistance on the drops as they fall

• this increases with velocity

• resultant force is downward

• this reduces resultant force

• eventually resultant force is zero

• drops have reached terminal/ maximum velocity

• drops near bottom are all travelling at terminal velocity

• so travel same distance in given time

(6)