Physics 2011 | Study Mode

Question 31
A
N28
B
N12
C
N16
D
N24
Explanation
Energy consumed = power x time = lvt = 2 x 250 x 6hr = 300 wh = 3 kwh but 1 kwh = N4
3 kwh = 3 x N4 = N 12

Question 32
A
Low presssure and low p.d
B
low pressure and high p.d
C
high pressure an low p.d
D
high pressure and high p.d
Explanation
Under high potential difference and low pressure gases are good conductor of electricity

Question 33
A
500 J
B
50 J
C
133 J
D
250 J
Explanation
Effective inductance
(1)/L = (1)/4 + (1)/8 = (3)/8
L = (8)/3
Energy stored = (1)/2 LI2
= (1)/2 x (8)/3 x 10 x 10 = (400)/3 = 133.3 J

Question 34
A
water
B
metals
C
wood
D
electrolyte
Explanation
Resistance in metals are proportional to temperature

Question 35
A
covalent
B
ionic
C
dative
D
electrovalent

Question 36
A
6.93 x 105s
B
6.93 x 105s
C
6.93 x104s
D
6.93 x 104s
Explanation
T (1)/2 = (0.693)/ = (0.693)/10-5
= 0.693 x 105
= 6.93 x 104 sec

Question 37
A
saturation
B
bonding
C
amplification
D
dopping

Question 38
A
8.58 x 10-19 J
B
8.50 x 10-15 J
C
8.58 x 10-17 J
D
8.85 x 10-18
Explanation
Work function, w = hfo 6.6 x 10-34 x 1.3 x 1015
= 8.58 x 10-19

Question 39
A
X is the anode and very high current is used
B
X is the anode and Y is the cathode
C
Y is the cathode and X is the anode
D
Y is the anode and very high current is used
Explanation
Metals and hydrogen are deposited at the cathode, while non-metals and oxygen are deposited on the anode
metals Y will form the anode which is deposited at the cathode made of x

Question 40
A
14.0 N
B
10.0 N
C
12.0 N
D
13.0 N
Explanation
The resultant, R is given by pythagoras rule, R2 = P2 + Q2
= 62 + 82 = 36 + 64 = 100
R = 100 = 10.0N

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