Objective Questions or MCQs on Basic Electrical 01

01) If 1 A current flows in a circuit, the number of electrons flowing through this circuit is

 0.625 × 10¹⁹

 1.6 × 10¹⁹

 1.6 × 10 ^{- 19}

 0.625 × 10 ^{- 19}

02) The resistivity of the conductor depends on

 area of the conductor.

 length of the conductor.

 type of material.

 none of these.

03) The resistance of a conductor of diameter d and length l is R Ω. If the diameter of the conductor is halved and its length is doubled, the resistance will be

 R Ω

 2R Ω

 4R Ω

 8R Ω

04) How many coulombs of charge flow through a circuit carrying a current of 10 A in 1 minute?

 10

 60

 600

 1200

05) ² The unit of resistivity is

 Ω.

 Ω - metre.

 Ω / metre.

 Ω / m².

06) Instantaneous power in inductor is proportional to the

 product of the instantaneous current and rate of change of current.

 square of instantaneous current.

 square of the rate of change of current.

 temperature of the inductor.

07) The voltage induced in an inductor is represented as,

 product of its inductance and current through it.

 ratio of its inductance to current through it.

 ratio of current through it to its inductance.

 product of its inductance and rate of change of current through it.

08) Magnetic flux has the unit of

 Newton

 Ampere turn

 Weber

  Tesla

09) If P is the power of a star connected system then what will be power of an equivalent delta connected system?

 P

 3P

 P/3

 None of the above

10) Which of the followings is/are active element?

 Voltage source

 Current source

 Both

 None of these.

Answers :

1. A
2. C
3. D
4. C
5. B
6. A
7. D
8. C
9. A
10. C

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