Current electricity Archives

11. The resistance of a conductor varies inversely as

Length

Area of cross-section

Temperature

Resistivity

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12. An open resistor, when checked with an ohmmeter reads

Zero

Infinite

High but within tolerance

Low but not zero

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Solution

13. In the case of direct current

Magnitude and direction of current remains constant

Magnitude and direction of current changes with time

Magnitude of current changes with time

Magnitude of current remains constant

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14. What will be energy used by the battery if the battery has to drive 6.28 x 1018 electrons with potential difference of 20 V across the terminal?

5 joules

10 joules

15 joules

20 joules

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Detailed SolutionWhat will be energy used by the battery if the battery has to drive

6.28 x 1018 electrons with potential difference of 20 V across the terminal?

15. When current flows through heater coil it glows but supply wiring does not glow because

Current through supply line flows at slower speed

Supply wiring is covered with insulation layer

Resistance of heater coil is more than the supply wires

Supply wires are made of superior material

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16. One Newton meter is same as

One watt

One joule

Five joules

One joule second

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17. Sparking occurs when a load is switched off because the circuit has high

Resistance

Inductance

Capacitance

Impedance

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Solution

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

Elements have individual currents

Currents are additive

circuit? A. Elements have individual currents B. Currents are additive C. Voltages are additive

Power are additive

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