Current electricity Archives - Page 7 of 9 - MCQ and Quiz for Exams

61. The resistance of a conductor varies inversely as

Length

Area of cross-section

Temperature

Resistivity

Detailed SolutionThe resistance of a conductor varies inversely as

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

Zero

Infinite

High but within tolerance

Low but not zero

Detailed SolutionAn open resistor, when checked with an ohmmeter reads

63. 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

Detailed SolutionIn the case of direct current

64. 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

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?

65. 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

Detailed SolutionWhen current flows through heater coil it glows but supply wiring does not glow because

66. One Newton meter is same as

One watt

One joule

Five joules

One joule second

Detailed SolutionOne Newton meter is same as

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

Resistance

Inductance

Capacitance

Impedance

Detailed SolutionSparking occurs when a load is switched off because the circuit has high

68. 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

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

69. The four bulbs of 40 W each are connected in series swift a battery across them, which of the following statement is true?

The current through each bulb in same

The voltage across each bulb is not same

The power dissipation in each bulb is not same

None of the above

Detailed SolutionThe four bulbs of 40 W each are connected in series swift a battery across them, which of the following statement is true?

70. Two resistors are said to be connected in series when

Same current passes in turn through both

Both carry the same value of current

Total current equals the sum of branch currents

Sum of IR drops equals the applied e.m.f.

Detailed SolutionTwo resistors are said to be connected in series when

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