8/14/2019 Paper 3 Nov 1999 Physics

1/2

Answer guide for O Level Physics (5054/3) Paper 3 Practical Test November 1999

Page 1 of 2 UCLES 2002

1(a) & (b)

l, w and t

s

all measured to the nearest mm with unit

l

29.5 cm to 29.9 cm

w

20.9 cm to 21.3 cm

t

s

approximately 1 cm 1

t

s repeated at several points and

t

correct 1

(c)(i)

m

(4.80 g to 5.20 g) and V

calculated correctly both with units 1

(ii) Density calculated correctly with unit and 2 or 3 s.f. 1

(d) Reasonable assumption e.g.

Single sheet of paper made from the same material as the stack

Or dimensions of stack same as dimensions of single sheet or

Sheets have same / uniform physical quantity

e.g. mass / thickness / density / volume / area 1

2(a) (Setting up apparatus no answer required)

(b)(i) & (ii) Inverted image made clear 1

(c) (adjusting appartus no answer required)

(d)

u and v

measured to nearest mm with units and u

>

f

(15.0 cm), v >

u

, and 95.0 cm _

u + _

v 105.0 cm 1

(e)(i) & (ii) S found correctly by measuring across _ 3 gaps or 3 values for single

space averaged 1

(f)(i) & (ii)

m

and s

calculated correctly with no units and correct units resp. 1

Value ofs

0.235 (cm) to 0.274 (cm) 1

3 (a) (c) (setting up apparatus no answer required)

(d)(i) At least two positions on each line clearly marked 1

Two lines drawn correctly 1

(d)(ii) Precautions e.g.

String held close to the lamina when positions marked or

Lamina displaced to see whether it returns to the marked setting or

Re-suspend after line marked and check line coincides with string 1

(e)

p

= 40 2 mm 1

(f) Balance point X on a point e.g. finger, pencil, pin, etc or

Check that X coincides with a third line from the other vertex of the

triangle (seen or stated) or

Suspend from X and see if it balances (or remains at rest) or

Theoretical check of intersection of medians 1

8/14/2019 Paper 3 Nov 1999 Physics

2/2

Answer guide for O Level Physics (5054/3) Paper 3 Practical Test November 1999

Page 2 of 2 UCLES 2002

4(a) Power supply, ammeter, rheostat and heater in series 1

Voltmeter in parallel with heater 1

(b) (Instruction to continue with experiment no answer required)

Readings

(c) Correct record of I

and V

with unit 1

(d) Correct calculation of P

with unit 1

(e) & (f) Table with units including values of

and t at 30 s intervals for 10

minutes 1

Attempt at better than 1

o

C for at least one reading 1

Points lie on a reasonably shaped curve 1

Graph

(g) Axes labelled with units 1

Suitable scale

e.g. Allow origin provided graph fills half the page in either

direction

Scale must allow

i and temperature at 600 s to be plotted

Allow a scale of 1 cm = 60 s on the time axis 1

Two points plotted correctly 1

(h)(i) Best fit smooth curve 1

Calculations

(ii) Reasonable tangent (accept any tangent close to

i

)1

Large triangle and correct calculation

(For a large triangle the hypotenuse of the triangle must occupy at

least half the length of the tangent if it were produced to the edge of

the grid) 1

(k) Correct substitution into equation with G

in o C / s 1

Correct calculation with unit and 2 or 3 s.f. 1