basic electrical Mcqs
1. How many coulombs of charge flow through a circuit carrying a current of 10 A in 1 minute?
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A. 1200

B. 10

C. 600

D. 60

2. Which quantity consists of a unit 1KWh ?
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A. Time

B. Charge

C. Power

D. Energy
3. The resistance of a few meters of wire conductor in closed electrical circuit is____________?
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A. practically zero

B. high

C. low

D. very high

4. Instantaneous power in inductor is proportional to the
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A. square of the rate of change of current.

B. emperature of the inductor.

C. square of instantaneous current.

D. product of the instantaneous current and rate of change of current.
5. Power dissipation in ideal inductor is
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A. Minimum

B. A finite value

C. Zero

D. Maximum

6. Which is the best conductor of electricity _______________?
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A. Iron

B. Silver

C. Copper

D. Carbon

7. With rise in temperature the resistance of semi-conductors_________________?
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A. decreases

B. increases

C. remains constant

D. first increases and then decreases

8. A light bulb draws 300 mA when the voltage across it is 240 V. The resistance of the light bulb is___________?
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A. 800 Q

B. 600 Q

C. 400 Q

D. 1000 Q

9. For which of the following ampere second could be the unit ?
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A. Charge

B. Energy

C. Reluctance

D. Power

10. An instrument which detects electric current is known as_____________?
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A. wattmeter

B. rheostat

C. voltmeter

D. galvanometer
11. The four bulbs of 40 W each are connected in series swift a battery across them, which of the following statement is true_______________?
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A. The current through each bulb in same

B. None of the above

C. The power dissipation in each bulb is not same

D. The voltage across each bulb is not same

12. The unit of resistivity is
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A. ? metre.

B. ? / m.

C. ? / metre.

D. ?.

13. The substances which have a large number of free electrons and offer a low resistance are called____?
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A. conductors

B. insulators

C. semi-conductors

D. inductors

14. Internal resistance of ideal current source is ?
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A. infinite

B. zero

C. 100 ohms

D. finite

15. The resistance of a conductor varies inversely as___________?
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A. length

B. area of cross-section

C. temperature

D. resistivity

16. If 1 A current flows in a circuit, the number of electrons flowing through this circuit is
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A. 0.625 10-<sup>19</sup>

B. 0.625 1019

C. 1.6 10<sup>19</sup>

D. 1.6 10-<sup>19</sup>

17. Ohms law is not applicable to____________?
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A. circuits with low current densities

B. high voltage circuits

C. vacuum tubes

D. carbon resistors

18. The voltage induced in an inductor is represented as,
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A. product of its inductance and current through it.

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

C. ratio of its inductance to the current through it.

D. ratio of the current through it to its inductance.

19. Out of the following which is not a poor conductor__________?
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A. Cast iron

B. Tungsten

C. Carbon

D. Copper
20. Two resistors are said to be connected in series when___________?
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A. same current passes in turn through both

B. both carry the same value of current

C. total current equals the sum of branch currents

D. sum of IR drops equals the applied e.m.f.

21. Which of the following has no units?
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A. Moment of a magnet

B. Magnetic susceptibility

C. ermittivity

D. Permeability

22. In a circuit a 33 Q resistor carries a current of 2 A. The voltage across the resistor is
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A. 80 V

B. 132 V

C. 66 v

D. 33 V

23. Magnetic flux has the unit of
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A. Weber

B. Newton

C. Tesla

D. Ampere-turn

24. Which of the followings is/are active element?
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A. Current source

B. None of these.

C. Voltage source

D. Both
25. You have to replace 1500 Q resistor in radio. You have no 1500 Q resistor but have several 1000 Q ones which you would connect__________?
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A. two in parallel

B. three in series

C. two in parallel and one in series

D. three in parallel

26. The minimum charge on an ion is______________?
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A. equal to the charge of an electron

B. equal to the atomic number of the atom

C. equal to the charge of the number of electrons in an atom (#) zero

27. Which of the following materials has a negative temperature co-efficient of resistance?
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A. Brass

B. Carbon

C. Aluminum

D. Copper

28. Varistors are______________?
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A. resistors with zero temperature coefficient

B. carbon resistors

C. non-linear resistors

D. insulators

29. A current of 16 amperes divides between two branches in parallel of resistances 8 ohms and 12 ohms respectively. The current in each branch is_____________?
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A. 4.6 A, 6.9 A

B. 6.4 A, 6.9 A

C. 4.6 A, 9.6 A

D. 6.4 A, 9.6 A
30. Electric pressure is also called________?
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A. power

B. energy

C. voltage

D. resistance

31. Which of the following statement is true both for a series and a parallel D. C. circuit?
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A. Currents are additive

B. Power are additive

C. Elements have individual currents

D. Voltages are additive

32. Conductance is reciprocal of____________?
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A. reluctance

B. resistance

C. inductance

D. capacitance

33. Inductor does not allow the sudden change of
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A. voltage

B. current

C. power

D. None of the above

34. The hot resistance of the bulbs filament is higher than its cold resistance because the temperature co-efficient of the filament is___________________?
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A. positive

B. about 2 ohms per degree

C. zero

D. negative

35. The rating of a fuse wire is always expressed in________________?
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A. kWh

B. ampere-hours

C. amperes

D. ampere-volts

36. The resistivity of the conductor depends on
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A. type of material.

B. length of the conductor.

C. area of the conductor.

D. none of these.

37. Which of the following material has nearly zero temperature co-efficient of resistance_________?
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A. Carbon

B. Copper

C. Porcelain

D. Manganin
38. A resistance having rating 10 ohms, 10 W is likely to be a__________?
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A. variable resistor

B. wire wound resistor

C. metallic resistor

D. carbon resistor

39. All of the following are equivalent to watt except_____________?
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A. joules/seC.

B. amperes x volts

C. amperes/volt

D. (amperes) ohm

40. Which of the following statement is true________________?
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A. A galvanometer with low resistance in series is an ammeter

B. A galvanometer with high resistance in series is an ammeter

C. A galvanometer with low resistance in parallel is a voltmeter

D. A galvanometer with high resistance in parallel is a voltmeter

41. Which one of the following does not have negative temperature co-efficient ____________?
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A. Rubber

B. Paper

C. Mica

D. Aluminium
42. Four wires of same material, the same cross-sectional area and the same length when connected in parallel give a resistance of 25 Q. If the same four wires are connected is series the effective resistance will be________?
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A. 300 ?

B. 100 ?

C. 400 ?

D. 200 ?

43. Which of the following are the passive elements?
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A. Bulb

B. None of these.

C. Both

D. Resistor

44. A 3 Q resistor having 2 A current will dissipate the power of_______________?
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A. 12 watts

B. 2 watts

C. 4 watts

D. 6 watts

45. Internal resistance of ideal voltage source is ?
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A. zero

B. finite

C. 100 ohms

D. infinite

46. The resistance of a conductor of diameter d and length l is R ?. If the diameter of the conductor is halved and its length is doubled, the resistance will be
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A. R ?

B. 2R ?

C. 4R ?

D. 8R ?
47. With rise in temperature the resistance of pure metals______________?
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A. decreases

B. increases

C. remains constant

D. first increases and then decreases

48. If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes______________?
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A. 0.8 ohm

B. 1.0 ohm

C. 0.4 ohm

D. 0.6 ohm

49. The resistance of a parallel circuit consisting of two branches is 12 ohms. If the resistance of one branch is 18 ohms, what is the resistance of the other ?
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A. 18 Q

B. 64 Q

C. 36 Q

D. 48 Q

50. The property of a conductor due to which it passes current is called___________?
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A. reluctance

B. inductance

C. resistance

D. conductance