Marking Scheme Physics Trial Spm Sbp 2016 Paper 3 4c142g

Marking Scheme Paper 3 Question 1

(a)(i)

Answer

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 Spring

1

(ii) Constant variable (iii) (b) (i)

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 √ E - a smooth best straight line √ F - minimum size of the graph is 5 x 4 squares of 2 cm x 2 cm. √ 7√ 6-5 √ 3-4 √ 2√ 1√

2

(a)(i)

(a)(ii)

1

x is directly proportional to 𝑓

1

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

1

1 𝑓

(a)(iii)

- 5 marks - 4 marks - 3 marks - 2 marks - 1 marks

1

= 1.6 x 10-3 Hz-1

f = 625 Hz (with correct unit)

1

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

1

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

1

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

1

v =Kfx = K (gradient)

1

(b)

1

3

3

1

3

= 0.2 (625) 1 -1

(c)

(d)

= 125 m Hz // 125 m s (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

1

1

1

1

1

1

1

1

1

1

1

1

Arrangement of apparatus :

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 o

T//∆Ɵ / C

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

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

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

(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.

1

State the method of measuring the responding variable 3. Record the magnitude of induced current produced by galvanometer.

1

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

Current, I

1

3

1

1

(viii)

Current, I

1

1

12

12

Number of turns of coil, n

TOTAL