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Current Electricity

Current Electricity
Which of the following is the best conductor of electricity?

Gold
Silver
Zinc
Copper

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Current Electricity
Electrical current is due to the flow of

Neutral particles only
Positive charges only
Negative charges only
Both positive and negative charges

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Current Electricity
Two lamps 100 W and 40 W are connected in series across 230 V (alternating). Which of the following statement is correct?

Both lamps will glow equally bright
40 W lamp will fuse
40 W lamp will glow brighter
100 W lamp will glow brighter

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Current Electricity
The resistance of two wires is 25 Ω when connected in series and 6 Ω when joined in parallel. The resistance of each wire is

10 Ω, 20 Ω
5 Ω, 10 Ω
20 Ω, 30 Ω
10 Ω, 15 Ω

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Current Electricity
An electrical lamp coonsumes 100 W of power. If the supply voltage is 220 V the energy consumed in 30 minutes is

5 kWh
0.05 kWh
0.005 kWh
5 kWh

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Current Electricity
Which of the following statement is true both for a series and a parallel D.C. circuit?

Currents are additive
Power are additive
Voltages are additive
Elements have individual currents

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