Answer Paper 3

Section A

1(a) (i) Angle of incidence. 1

(ii) Angle of refraction. 1

(iii) Glass block/refractive index of the glass block/density of the glass block….

1

1(b) (i)

i/ 0 r/ 0

20 13

30 19/20

40 25

50 30

60 36

2

(ii)

i/ 0 r/ 0 sin i sin r

20 13 0.34 0.22

30 19/20 0.50 0.33/0.34

40 25 0.64 0.42

50 30 0.77 0.50

60 36 0.87 0.59

1) All quantities i, r, sin i and sin r correct --√ 2) Units for all quantities correct ---- √ 3) * All values of sin i correct ----- √√ * 1 value of sin i incorrect ------√ * > 1 value of sin i incorrect ------ 0 4) * All values of sin r correct ----- √√ * 1 value of sin r incorrect ------√ * > 1 value of sin r incorrect ------ 0 5) Consistency of decimal point for sin i --- √ 6) Consistency of decimal point for sin r --- √

Score Mark

7 – 8 5

5 – 6 4

3 – 4 3

2 2

1 1

0 0

5

Value of r

5 values correct ----- (2)

4 or 3 values correct ------(1)

2 values and below -------(0)

1(c) On the graph paper.

1) Correct title on axes-----√ 2) Units correct ------- √ 3) Even scale -------√ 4) * All points correctly plotted -------- √√

1 point incorrectly plotted ------- √

> 1 point incorrectly plotted ------ 0 5) Best straight line fixed -------- √ 6) > 50% graph paper --------√

Score Mark

6 – 7 5

5 – 4 4

3 3

2 2

1 1

5

1(d) Sin r is directly proportional to sin i . 16

Total 16

2(a) V is decreases linearly to I V berkurang secara linear dengan I

1

1. Extrapolation of the graf Garis melintasi pada paksi - y 2. V = 7.0 V

2

Electromotive force Daya Gerak Elektrik

2

2(b) 1. Shows the triangle with an acceptable/ minimum size [ ( 4 x 4 ) 8 cm x 8 cm ] Segitiga dilukis, saiz minimum [ ( 4 x 4 ) 8 cm x 8 cm ] 2. Substitute correctly (3.0 - 7.0) V / (3.0 - 0.0 ) A - 1.33 VA -1 Gantian yang betul (3.0 - 7.0) V / (3.0 - 0.0 ) A

3

- 1.33 VA -1 3. States the value of gradient and its unit 1.33 VA -1 // 1.33 Ω. Nilai kecerunan beserta unit yang betul 1.33 VA -1 // 1.33 Ω.

1. Show the vertical line from I = 2.0 A until touches the graph then horizontal line until it touches the y axis at V Tunjuk pada graf I = 2.0 A secara garis menegak dan melintang sehingga menyentuh paksi – y pada V 2. V = 4.3 V

2

2(c) 1. E = I (R + r) 7.0 V = 2.0 A (R + 1.33 Ω ) 2. R = 2 .17 Ω // 2 .17 VA -1

1

The position of the eyes must be perpendicular to the reading taken to avoid parallax error. Kedudukan mata mesti berserenjang dengan skala bacaan untuk mengelakkan ralat paralaks @ The position of the eye must be perpendicular with the scale of the voltmeter to avoid parallax error. Kedudukan mata mesti berserenjang dengan skala voltmeter untuk mengelakkan ralat paralaks. @ Repeat the experiment more times to Voltage for each Current to get average and accurate result. Eksperimen diulangi beberapa kali untuk Voltan bagi setiap Arus untuk mendapatkan purata dan kejituan keputusan.

3 State a relevant hypothesis The higher the force the higher the extension

State the aim of experiment To investigate the relationship between force and extension.

State the suitable manipulated variables and responding variable (Quantity that can be measured)

MV- Force // weight of load RV - extension pf spring

State the constant variable CV – spring constant // diameter of spring

State the complete list of apparatus and materials Slotted mass, spring, retort stand, meter ruler, pin,

Draw the functional arrangement of the apparatus

State the method to control the manipulated variable Hang a spring to the retort stand without load Record the reading on the meter ruler shown by pin, x0 Hang 100 g of load at the end of spring Record the reading on the meter ruler shown by pin, x1 Calculate the extension , x = x1 - x0

State how the data tabulated with the title MV and RV

Mass of slottedmass/g Extension / cm

100.0 200.0 300.0 400.0 500.0

State how the data is analysed, plot a graph RV against MV

4(a) (a)

The number of turns affect the magnitude of induced current

(b) When number of turns increases, the magnitude of induced current

increases

c(i) Aim:

To investigate the relationship between number of turns and the

magnitude of induced current

c(ii) Variable;

Manipulated : The number of turns

Responding : The magnitude of induced current

Fixed : Velocity

(iii) List of Apparatus : Metre rule, miliammeter, insulated copper wire, retort stand,

cardboard tube and Bar magnet

(iv)

List of Apparatus

(v) Procedure :

1. The insulated copper wire is wound around a cardboard

tube with number of turns and the height of a bar

magnet from the above of top end of the solenoid.The

bar magnet is dropped into the solenoid.

2. Start the experiment the number of turns = 10

with using insulated copper wire and metre rule. 3. Measure, record and calculate the value of the

magnitude of induced current using miliammeter.

4. Repeat the experiment with the different the number of

turns = 20, 30, 40, 50 and 60.

(vi)

Tabulation of data

Number of turns Induced Current / A

10

20

40

60

80

100

(vii) Analysing of data

OR

Plot a graph of Induced Current against the number of turns

TOTAL 12

I (A)

N