Detailed SolutionThe condition for the validity under Ohm’s law is that
Current electricity
Resistance must be uniform
Current should be proportional to the size of the resistance
Resistance must be wire wound type
Temperature at positive end should be more than the temperature at negative end
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12. When electric current passes through a bucket full of water, lot of bubbling is observed. This suggests that the type of supply is
A.C.
D.
B.
None of the above
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13. Resistance of carbon filament lamp as the applied voltage increases.
Increases
Decreases
Remains same
None of the above
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Answer is Right!
Detailed SolutionResistance of carbon filament lamp as the applied voltage increases.
14. Voltage dependent resistors are usually made from
Charcoal
Silicon carbide
Nichrome
Graphite
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Detailed SolutionVoltage dependent resistors are usually made from
15. Which is the best conductor of electricity?
Iron
Silver
Copper
Carbon
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Detailed SolutionWhich is the best conductor of electricity?
16. The resistance of a parallel circuit consisting of two branches is 12 ohms. If the resistance of one branch is 18 ohms, what is the resistance of the other?
18 ohms
36 ohms
48 ohms
64 ohms
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17. Conductance: mho ::
Resistance : ohm
Capacitance : Henry
Inductance : farad
lumen : steradian
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18. 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
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19. Which of the following material has nearly zero temperature coefficient of resistance?
Manganin
Porcelain
Carbon
Copper
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20. The hot resistance of the bulb’s filament is higher than its cold resistance because the temperature coefficient of the filament is
Zero
Negative
Positive
About 2 ohms per degree
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Answer is Right!