Resistance of carbon filament lamp as the applied voltage increases.
decreases
none of the above
remains same
increases
decreases
Bulbs in street lighting are all connected in
parallel
series-parallel
series
end-to-end
parallel
For testing appliances the wattage of test lamp should be
any value
high
very low
low
high
When a voltage of one volt is applied a circuit allows one micro ampere current to flow through it. The conductance of the circuit is
1 n-mho
106 mho
1 milli-mho
none of the above
1 n-mho
Which of the following can have negative temperature coefficient ?
Metallic alloys
Liquid metals
Compounds of silver
Electrolytes
Electrolytes
Conductance : mho ::
capacitance : henry
inductance : farad
resistance : ohm
lumen : steradian
resistance : ohm
1 angstrom is equal to
10″10 m
10~14 m
10″6 cm
10-8 mm
10″10 m
One newton meter is same as
one joule
five joules
one watt
one joule second
one joule
Two copper conductors have equal length. The cross-sectional area of one conductor is four times that of the other. If the conductor having smaller cross-sectional area has a resistance of 40 ohms the resistance of other conductor will be
20 ohms
10 ohms
160 ohms
80 ohms
10 ohms
A nichrome wire used as a heater coil has the resistance of 2 £2/m. For a heater of 1 kW at 200 V the length of wire required will be
80 m
60 m
40 m
20 m
80 m
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