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2001 - JAMB Physics Past Questions and Answers - page 3

21
The cost of running five 60 W lamps and four 100 W lamps for 20 hours if electrical energy cost #10.00 per kwh is
A
280.00
B
160.00
C
120.00
D
140.00
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22
In a Daniel cell, the depolarizer, positive and negative electrodes are respectively
A
copper sulphate, copper and zinc
B
manganese dioxide, carbon and zinc
C
sulphuric acid, lead oxide and lead
D
potassium hydroxide, nickel and iron.
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23
when a piece of rectangular glass block is inserted between two parallel capacitor,at constant plate area and distance of separation, the capacitance of the capacitor will
A
increase
B
decrease
C
decrease then increase
D
remain constant
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24
the ratio of electrostatic force FE to gravitational force FG between two protons each of charge e and mass m, at a distance d is
A
e/4πԐoGm
B
e2/Gm2
C
Gm2/4πԐoe2
D
e2/4πԐoeGm2
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25
A cell can supply current of 0.4 A and 0.2 A through a 4.0Ω and 10.0Ω resistors respectively.
This internal resistance of the cell is
A
2.0Ω
B
1.0Ω
C
2.5Ω
D
1.5Ω
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26
The particles emitted when \( ^{39}_{19}K \text{ decay to } ^{39}_{19}K \) is
A
gamma
B
beta
C
electron
D
alpha
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27
I. Low pressure.
II. High pressure.
III. High p.d.
IV. Low p.d.
Which combination of the above is true of the conduction of electricity through gases?
A
I and IV only
B
I and III only
C
II and IV only
D
II and III only
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28
The current through a resistor in an a.c circuit is given as 2 sin wt. Determine the d.c. equivalent of the current
A
A/√2
B
2/√A
C
2 A
D
√2 A
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29
The primary coil of a transformer has N turns and is connected to a 120 V a.c. power line. If the secondary coils has 1 000 turns and a terminal voltage of 1 200 volts, what is the value of N?
A
120
B
100
C
1 000
D
1 200
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30
Which of the following metals will provide the greatest shield against ionizing radiation
A
Iron
B
Manganese
C
Alminium
D
Lead
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