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2011 - JAMB Physics Past Questions and Answers - page 4

31

If the charge of electricity is K wh is N4, what is the cost of operating an electrical appliance rated 250 v,2 A for six hours?

A
N28
B
N12
C
N16
D
N24
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32

Under which of the following conditions do gases conduct electricity?

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
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33

Two inductors of inductance 4 II and 8 II are arrange in series and a current of 10 A is passed through them. What is the energy stored in them?

A
500 J
B
50 J
C
133 J
D
250 J
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34

Which of the following materials has an increase in resistance with temperature?

A
water
B
metals
C
wood
D
electrolyte
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35

The bond between silicon and germanium is

A
covalent
B
ionic
C
dative
D
electrovalent
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36

A radioactive isotope has a decay constant of 10-5s4. Calculate half life

A
6.93 x 105s
B
6.93 x 105s
C
6.93 x104s
D
6.93 x 104s
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37

The electrical properties of germanium can be altered drastically by the addition of impurity. This process is referred to as

A
saturation
B
bonding
C
amplification
D
dopping
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38

If the threshold frequency for tungsten is 1.3 x 1015Hz, what is its work function?


[H = 6.6 x 10-34 Js]

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
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39

Which of the following will be applied when a metal Y is used to electroplate another metal X in electrolysis?

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
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40
The diagram above shows two vectors at right angles to each other. The value of the resultant vector is
A
14.0 N
B
10.0 N
C
12.0 N
D
13.0 N
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