1.
30 0
40 0
80 0
i=50 0
2.
The leaf collapses/falls;
3.
4.
E=I 2 RT;
=2 2 X 20X1X60X60;

=288000J;
5.
a) Resistance of a material of unit length and unit cross sectional at a given temperature.;
b) length of the conductor;
Type of conductor material;
6.
V=2d/t;
330=2d/1.5;
D= 247.5 m;
7.
Scan
8.
9.
Image
45 0
45 0
Correct rays and image ;;

10.
A) Carbon brush
B) SPLIT RING/COMMUTATOR
11.
EMF is the voltage across the cell in an open circuit p.d is the voltage across the cell in a closed circuit
12.
No multiple refraction in prism/no energy loss/no silver peeling off.
13.
umbra
Correct rays ; correct umbra; correct penumbra;
(i) L
2 penumbra
(ii) L
1 is brighter
(iii) Power dissipated by bulb l
1
is higher than in the other two=iv at l
1
current is un divided.
(b) ( i) emf=1.5V
(ii) V=IR

1.2=IX3
I=0.4A
(iii)
1.5=1.2+0.4xr
1.5-1.2=0.4r
0.3=0.4r
E=V+Ir r= =0.75Ω
15. a) This is the ratio of velocity of light in vacuum to the velocity of light in the material√ a n
1
=
b) i) sini sinr
an1
= sin40 sin24 0
0
=
0.6428
0.4067
=1.581 ii) a n
1
C =
=39.23 0
(
(iii) a n
1 =
)

=0.9277 iii) - light must be traveling from denser to rarer medium√
-the angle of incident must be greater than critical of the material√ d) Bending of light is more in paraffin than in water thus the speed of light in paraffin is less than that in water√
(i) (a) Flemings left hand rule
If the thumb, first and second fingers of the left hand are held mutually at right angles and the first finger points the direction of the magnetic field, the second finger in the direction of current, then the thumb points the direction of motion.
(ii) (c ) (i) core is
(iii)
(iv) current
(v)
(vi)
When the push button switch is pushed on, current flows √1 and the soft iron magnetized, soft iron core (magnetized) attracts, the soft iron armature √1 and the hammer hits the gong; Mean while the contact √1 is broken stopping flow. The core demagnetized releases the armature and the hammer goes back √1. The process is repeated. 4 marks
(vii)
(viii) 5.
(ix) (ii) If the armature is made of steel, the hammer hits the gong and remains there /
(x) mark the bell rings once this is because steel acquires permanent magnetism. √ 1
(xi)
(xii) (iii) The soft iron core should be U – shaped . √ 1 mark

1.
A) (i) like charges repel, unlike charges attract.
(ii) coulomb
iii) Yes it safe  all the charge from the lightning  will be on the outside of the car which is a hollow conductor. b) (i)
(ii) 6V 
(iii)

= CV 
= 20 x 10 -6 x 6
= 1.20
-4 C or 120

C c) – By providing a safe path to ground for the discharge 
) (i) V = distance = 11cm x 10 -2
time 0.1375

1
= 0.8m/s

(ii) f = 1 /
T

1
T = 1 /
20
= 0.05 seconds

1

(c) (i) – Humidity
- Temperature
- Density

1 any one
- Pressure
- Wind (speed of air) c.(i)Amplitude is 8cm
(ii).3
= 80cm

= 80 = 26.67cm.√
3
But v = f

= 0.5556 x 26.67cm√
= 14.82m/s or