Current Electricity MCQ Questions & Answers

1

Resistance of a material always decreases if

A) Temperature of material is decreased B) Temperature of material is increased C) Number of free electrons available becomes more D) None of the above is correct

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Answer & Solution

Answer: Option C

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2

The rating of a fuse wire is always expressed in

A) Ampere-hours B) Ampere-volts C) kWh D) Amperes

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Answer & Solution

Answer: Option D

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3

The minimum charge on an ion is

A) Equal to the atomic number of the atom B) Equal to the charge of an electron C) Equal to the charge of the number of electrons in an atom D) Zero

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Answer & Solution

Answer: Option B

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4

Current velocity through a copper conductor is

A) the same as propagation velocity of electric energy B) independent of current strength C) of the order of a few micro m/s D) nearly 3 x 10⁸ m/s

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Answer & Solution

Answer: Option C

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5

For which of the following 'ampere second' could be the unit?

A) Reluctance B) Charge C) Power D) Energy

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Answer & Solution

Answer: Option B

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6

An instrument which detects electric current is known as

A) Voltmeter B) Rheostat C) Watt-meter D) Galvanometer

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Answer & Solution

Answer: Option D

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7

It becomes more difficult to remove

A) Any electron from the orbit B) First electron from the orbit C) Second electron from the orbit D) Third electron from the orbit

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Answer & Solution

Answer: Option D

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8

Two resistances Rl and Ri are connected in series across the voltage source where Rl > Ri. The largest drop will be across

A) Rl B) Ri C) Either Rl or Ri D) None of them

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Answer & Solution

Answer: Option A

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9

A closed switch has a resistance of

A) Zero B) About 50 ohms C) About 500 ohms D) Infinity

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Answer & Solution

Answer: Option A

Solution:

A closed switch allows current to flow freely through the circuit, meaning its resistance is zero or very close to zero.

This lack of resistance ensures that there is no significant opposition to the flow of electric current, allowing the circuit to be completed.

In contrast, an open switch would have infinite resistance, preventing any current from flowing through the circuit.

10

A 40 W bulb is connected in series with a room heater. If now 40 W bulb is replaced by 100 W bulb, the heater output will:

A) Decrease B) Increase C) Remain same D) Heater will burn out

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Answer & Solution

Answer: Option B

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Current Electricity MCQ Questions & Answers | Electrical Engineering