MARKING SCHEME PHYSICS TRIAL SPM SBP 2016 PAPER 3

Marking Scheme Paper 3
Answer

Question
1

(a)(i)

(ii)
(iii)
(b) (i)

Mark

Manipulated variable = Depth of the rod immersed // d

1

Responding variable =

Reading of spring balance // Bouyant Force // F

1

Cross sectional area of rod // Density of liquid //
Gravitational Force, g

1

Constant variable

=

W0 = 9.3 N

1

(ii)

W = 8.5, 7.7, 7.0, 6.3, 5.6
All correct : 2 marks

At least 3 correct : 1 mark

2

(iii)
(c)

F = 0.8, 1.6, 2.3, 3.0, 3.7

1

d/cm
5.0
10.0
15.0
20.0
25.0

W/N
8.5

7.7
7.0
6.3
5.6

1 mark – 3 columns for d, W and F
1 mark – correct units for each d, W and F
1 mark – all values are consistent

F/N
0.8
1.6
2.3
3.0
3.7

(d)

Draw the graph of x against W .
A - Label y-axis and x-axis correctly √

B

- States the unit at the axis correctly √

C

- Both axes with the even and uniform scale √

D

- 5 points correctly plotted: √ √
- at least 3 points correctly plotted √

2

E

- a smooth best straight line √

F

- minimum size of the graph is 5 x 4 squares of 2 cm x 2 cm. √

1
f

(a)(i)

x is directly proportional to

(a)(ii)

Show the horizontal line to the y-axis, x = 1.0 m
1
Show the vertical line to the x-axis,
= 1.6 x 10-3 Hz-1
f
1
= 1.6 x 10-3 Hz-1
f

f = 625 Hz (with correct unit)

(a)(iii)

1

Substitute correctly ( according to the candidate’s graph)
4.5−0
7.2 ×10−3 −0

1

= 0.2 (625)

3

1
1

v =Kfx

= K (gradient)

1

1

Draw a sufficient large triangle (8 cm x 10 cm)

State the correct value of the gradient with unit
m = 625 m Hz (with correct unit)

(b)

1

3
1

1
1

3

1
(c)
(d)

= 125 m Hz // 125 m s-1 (with correct unit)
decreases
State one correct precaution
The position of the eye must be perpendicular to the scale reading//
Repeat the experiment to get the average value//
Do experiment at open space
Total

1

1

1

1

12

12

3

(a)
(b)
(c)(i)

(ii)

(iii)

State a suitable inference
The rise in temperature depends on the heat absorbed
State a relevant hypothesis

The higher the heat absorbed, the higher the rise in temperature
State the aim of experiment
To investigate the relationship between the heat absorbed and the rise in
temperature
State the manipulated variable and the responding variable
Manipulated : heat absorbed
Responding : rise in temperature
State ONE variable that kept constant
Volume/density of water/time of heating
Complete list of apparatus and materials
Thermometer, immersion heater, water, power supply, beaker
Arrangement of apparatus :

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

3

Thermometer

(iv)
Water

State the method of controlling the manipulated variable
1. The set-up of the apparatus is as shown in figure above.
2. The immersion heater with power, P of 20 W is used to heat up
the water for 3 minutes.
(v)

(vi)

State the method of measuring the responding variable
3. The temperature, T is measured using thermometer. The rise of
temperature is calculated using formula
∆Ɵ = final temperature – initial temperature and recorded.

1

Repeat the experiment at least 4 times
4. The experiment is repeated by using P = 40, 60, 800 and 100 W

1

Tabulation of data:
Power /W // Heat/J

1
T//∆Ɵ / C
o

1

Analyze the data.
T//∆Ɵ / oC

1

1

Total marks

12

12

(a)

State a suitable inference
Current induced/produced depends on the number of turns of coil

1

1

(b)

State a relevant hypothesis
The greater the number of turns of coil, the greater the current induced

1

1

1

1

State the manipulated variable and the responding variable
Manipulated variable: the number of turns of coil on solenoid, n
Responding variable : magnitude of current induced, I

1
1

3

State ONE variable that kept constant
Fixed variable : strength of bar magnet // height of magnet, h
// Resistance/diameter of wire

1

(vii)
Heat,Q/J

4

(c) (i) State the aim of experiment
To investigate the relationship between the number of turns of coil and 
current induced
(ii)

.
(iii)

Complete list of apparatus and materials
Ammeter/microammeter/galvanometer, retort stand, copper wire, connecting 
wire

1

1

(iv)

Arrangement of apparatus :

1

1

(v)

State the method of controlling the manipulated variable
1. The set-up of the apparatus is as shown in figure above.
2. Start the experiment with n=50 turns of coil on solenoid. Drop the 
    bar magnet into the solenoid at constant height of h=50 cm.
State the method of measuring the responding variable
3. Record the magnitude of induced current produced by galvanometer.
Repeat the experiment at least 4 times
4. Repeat the experiment by using n = 60, 70, 80 and 90.

(vi)

Number of turns of coil, n
50
60
70
80
90

1

1
1

3

1

1

Current, I

  (viii)

Current, I

1

1

12

12

Number of turns of coil, n

TOTAL