Current Electricity
If 2 resistors of 5kΩ and 7kΩ are connected in series across a 15V battery, then equivalent resistance of the series combination should be
10kΩ
12kΩ
15kΩ
20kΩ
12kΩ
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The value of resistance in insulators isA. small
B. large
C. zero
D. can not be determined
The resistance of a copper wire if it’s length is 1 m and its diameter is 2 mm is
A. 5.4 x 10-3 Ω
B. 5 Ω
C. 4 Ω
D. 2 Ω
The wire which carries no electricity is called
A. Earth/ground wire
B. livewire
C. neutral wire
D. delta wire
In a circuit 3 resistors 2Ω, 3Ω, 6Ω are connected (in parallel combination) across a battery of 6V, then the total current of the circuit should be
A. 12A
B. 3A
C. 6A
D. 2A
The specific resistance of iron is
A. 5.25 × 10-8
B. 1.69 × 10-8
C. 9.8 × 10-8
D. 2.75 × 10-8
The current which does not change its direction of flow is called
A. negative current
B. direct current
C. alternative current
D. fixed current
To pass the maximum current in the circuit, an ideal galvanometer should have
A. large resistance
B. very small resistance
C. no resistance
D. none of above
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