1) Resistivity of a wire depends on...1) Resistivity of a wire depends on A [ ]) length B [v])...

1) Resistivity of a wire depends on

A [ ]) length

B [v]) material

C [ ]) cross section area

D [ ]) none of the above

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

A [ ]) 1.6 × 1019

B [v]) 0.625 × 1019

C [ ]) 1.6 × 10 - 19

D [ ]) 0.625 × 10 - 19

3) 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

A [ ]) R Ω

B [ ]) 2R Ω

C [ ]) 4R Ω

D [v]) 8R Ω

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

minute?

A [ ]) 10

B [ ]) 60

C [v]) 600

D [ ]) 1200

5) The unit of resistivity is

A [ ]) Ω.

B [v]) Ω - metre.

C [ ]) Ω / metre.

D [ ]) Ω / m².

6) Instantaneous power in inductor is proportional to the

A [v]) product of the instantaneous current and rate of change of current.

B [ ]) square of instantaneous current.

C [ ]) square of the rate of change of current.

D [ ]) temperature of the inductor.

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

A [ ]) product of its inductance and current through it.

B [ ]) ratio of its inductance to current through it.

C [ ]) ratio of current through it to its inductance.

D [v]) product of its inductance and rate of change of current through it.

8) Magnetic flux has the unit of

A [ ]) Newton

B [ ]) Ampere turn

C [v]) Weber

D [ ]) Tesla

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

delta connected system?

A [v]) P

B [ ]) 3P

C [ ]) P/3

D [ ]) None of the above

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

A [ ]) Voltage source

B [ ]) Current source

C [v]) Both

D [ ]) None of these.

11) Which of the following are the passive elements?

A [ ]) Resistor

B [ ]) Bulb

C [v]) Both


12) Power dissipation in ideal inductor is

A [ ]) Maximum

B [v]) Zero

C [ ]) Minimum

D [ ]) A finite value

13) Inductor does not allow the sudden change of

A [v]) current

B [ ]) voltage

C [ ]) power


14) Capacitor does not allow the sudden change of

A [ ]) current

B [v]) voltage

C [ ]) power


15) Internal resistance of ideal voltage source is

A [v]) zero

B [ ]) infinite

C [ ]) finite

D [ ]) 100 ohms

16) Internal resistance of ideal current source is

A [ ]) zero

B [v]) infinite

C [ ]) finite

D [ ]) 100 ohms

17) Which quantity consists of a unit KWh ?

A [v]) Energy

B [ ]) Time

C [ ]) Power

D [ ]) Charge

18) Which of the following has no units?

A [ ]) Permeability

B [ ]) Moment of a magnet

C [v]) Magnetic susceptibility

D [ ]) Permittivity

19) Which of the following quantities consists of SI unit as WATT ?

A [ ]) Force

B [ ]) Charge

C [ ]) Current

D [v]) Power

20) Rms value is defined based on which of the following?

A [v]) Heating effect

B [ ]) Charge transfer

C [ ]) Current

D [ ]) Voltage

21) Which of the following defined the average value ?

A [ ]) Voltage

B [ ]) Heating effect

C [ ]) Current

D [v]) Charge transfer

22) For symmetrical wave form average value of one full cycle is

A [ ]) 1

B [ ]) 1.11

C [ ]) 2.22

D [v]) 0

23) If a pure inductor is connected across the ac source, the average power taken by the

inductor is

A [ ]) A few watt

B [ ]) 100 watt

C [v]) zero watt

D [ ]) Maximum power

24) Average power taken by the pure capacitor is

A [v]) Zero

B [ ]) Minimum

C [ ]) Maximum

D [ ]) Any of the above

25) Which of the following is not a vector quantity?

A [ ]) Linear momentum.

B [ ]) Angular momentum.

C [ ]) Electric field.

D [v]) Electric potential.

26) If conductance increases as temperature increases it is called as ..........

A [v]) Negative co-efficient

B [ ]) Positive co-efficient

C [ ]) Both 1 & 2


27) Which material has extremely large resistance ?

A [ ]) Semiconductor

B [ ]) Conductor

C [v]) Insulator


28) What is mean by the rate of flow of an electric charge ?

A [v]) Electric current

B [ ]) Electric potential

C [ ]) Electric resistance


29) What is the unit of potential difference ?

A [ ]) Ohm

B [v]) Volt

C [ ]) Watt

D [ ]) Ampere

30) Which property is used to oppose the flow of current ?

A [ ]) Poteintial difference

B [ ]) Capacitance

C [ ]) Inductance

D [v]) Resistance

31) What is the SI unit of electric current ?

A [v]) Ampere

B [ ]) Ohm

C [ ]) Faraday


32) What is time period T?

A [ ]) Time taken by an alternating quantity to complete the (+)ve half.

B [v]) Time taken by an alternating quantity to complete the a cycle.

C [ ]) Time taken by an alternating quantity to complete the (-)ve half.

D [ ]) Time taken by an alternating quantity to reach the peak value.

33) What is called the frequency in AC operation?

A [ ]) No. of (+)ve quadrature made per second.

B [v]) No. of cycles made per second.

C [ ]) No. of (-)ve quadrature made per second

D [ ]) No. of wave made per second.

34) What is the relation between time period T and frequency?

A [v]) T = 1 / frequency.

B [ ]) T = 0.5 / frequency.

C [ ]) T = 0.85 / frequency.

D [ ]) T = frequency.

35) What is referred as the average value in AC opearation?

A [ ]) Average of all values of an alternating quantity.

B [ ]) Average of all values of the phase sequences.

C [ ]) Average of all values of the (+)ve and (-)ve half.

D [v]) Average of all values of an alternating quantity over a complete cycle.

36) What is form factor?

A [ ]) Average value / R.M.S. value

B [ ]) Average value / Peak value.

C [ ]) Instantaneous value / Average value.

D [v]) R.M.S. value / Average value.

37) Select the wave that has the least value of form factor.

A [v]) Square wave.

B [ ]) Rectangular wave.

C [ ]) Triangular wave.

D [ ]) Sine wave.

38) What is the frequency of domestic power in India?

A [v]) 50 Hz.

B [ ]) 60 Hz.

C [ ]) 220 Hz.

D [ ]) 70 Hz.

39) What is apparent power in AC operation?

A [ ]) Product of voltage and current.

B [v]) Product of rms volatge and rms current.

C [ ]) Product of voltage and current at no load.

D [ ]) Product of voltage and current at full load.

40) What is the real power in AC operation?

A [ ]) VIcosφ.

B [ ]) Apperant power × cosφ.

C [v]) Both option 1 & 2.


41) What is called the instantaneous value of an alternating current?

A [v]) The value of alternating quantity at any instant.

B [ ]) The value of peak quantity at any instant.

C [ ]) The value of peak current at any instant.

D [ ]) The value of alternating frequency at any instant.

42) What is called a cycle in case of AC operation ?

A [ ]) When ac completes the (+)ve half, is called a cycle.

B [v]) When ac goes through a complete (+)ve to (-)ve, is called a cycle.

C [ ]) When an alternating quantity completes the (-)ve cycle, is called a cycle.

D [ ]) Option 1 and 2 both.

43) Capacitors for P.f correction are rated in

A [ ]) KW.

B [ ]) KVA.

C [ ]) KV.

D [v]) KVAR.

44) The field at any point on the axis of a current carrying coil will be

A [ ]) parallel to axis.

B [ ]) perpendicular to the axis.

C [v]) at angle of 45° with the axis.

D [ ]) zero.

45) Two straight parallel conductors carry equal currents in opposite direction. The force

between them is

A [v]) repulsive.

B [ ]) attractive.

C [ ]) zero.

D [ ]) none of above.

46) While comparing magnetic field and electric circuits, the point of dissimilarity exists

while considering

A [ ]) mmf and emf.

B [ ]) reluctance and resistance.

C [v]) flux and current flow.

D [ ]) permeance and conductance.

47) Magnetism of a magnet can be destroyed by

A [ ]) hammering.

B [ ]) heating.

C [ ]) by inductive action of another magnet.

D [v]) by all above methods.

48) Ampere second is the unit of

A [ ]) conductance.

B [ ]) power

C [ ]) energy.

D [v]) charge.

49) If two point charges are denoted by + Q and - Q and distance between this charges is

d, then the dipole moment P equal to

A [ ]) Q2 × d.

B [v]) Q × d.

C [ ]) Q / d2.

D [ ]) Q2 / d.

50) Electric flux in coulombs emanating from any surface of a cube containing C coulombs

of charge at its centre i

A [ ]) Q / 4π.

B [ ]) 4πQ / 6E.

C [ ]) Q / 6.

D [v]) Q / 6E.

51) Electric displacement is a ____________________ quantity.

A [ ]) scalar.

B [v]) vector.

C [ ]) both of above.

D [ ]) none of above.

52) The unit of electric displacement vector is

A [v]) C / m²

B [ ]) Ampere-m.

C [ ]) C / m.

D [ ]) C - m.

ANSWER KEY-Correct answer is indicated by symbol (V) in options.

HINTS-In some questions options E-HINTS is indicating the hints of answer.

53) _____at a point may be defined as equal to lines of force passing normally through a unit cross-section at that point A [v]) Electric intensity. B [ ]) Magnetic flux density. C [ ]) Electric flux. D [ ]) None of the above.

54) Electric field intensity ( E ) at any point in an electric field is equal to A [v]) potential gradient. B [ ]) ( potential gradient )² C [ ]) ( potential gradient )½ D [ ]) ( potential gradient )⅓

55) The lines of force due to charged particles are A [ ]) always straight. B [v]) always curved. C [ ]) sometimes curved. D [ ]) none of above.

56) An electric field line and an equipotential surface are A [v]) always 90°. B [ ]) always parallel. C [ ]) inclined at any angle. D [ ]) none of above.

57) The ratio of electric flux density to electric field intensity is called ......... of medium A [ ]) permeability. B [v]) permittivity. C [ ]) reluctance. D [ ]) capacitance.

58) The value of E within the field due to a point charge can be found with help of A [ ]) Faradays law.

B [ ]) Kirchhoffs law. C [ ]) Lenzs law. D [v]) Coulombs law.

59) The electric field at a point situated at a distance d from straight charged conductor is A [ ]) proportional to d. B [v]) inversely proportional to d. C [ ]) inversely proportional to d² D [ ]) none of abov.

60) Which field is associated with the capacitor? A [ ]) Magnetic. B [v]) Electric C [ ]) Both of (1) and (2). D [ ]) none

61) Which of the following expression is correct for electric field strength? A [ ]) E = πD² B [ ]) E = πD. C [ ]) E = D² / ε. D [v]) E = D / ε.

62) An equipotential surface is one which has all points at _____________ potential. A [ ]) zero. B [ ]) different. C [v]) same. D [ ]) none of them.

63) When a dielectric is placed in an electric field the field strength A [v]) decreases. B [ ]) increases. C [ ]) reduce to zero.

D [ ]) remain unchanged.

64) For dielectrics flux is proportional to A [v]) potential difference between electrodes. B [ ]) resistivity of medium. C [ ]) rate of change of potential difference. D [ ]) rate of change of current.

65) Electric field inside a hollow metallic charged sphere is A [ ]) increasing towards centre. B [ ]) decreasing towards centre. C [v]) zero. D [ ]) none of above.

66) Unit of electric flux density is A [ ]) coulomb. B [ ]) farad / meter. C [v]) coulomb / meter² D [ ]) weber / meter²

67) The number of Faraday tubes of flux passing through a surface in an electric field is called A [ ]) electric charge density. B [ ]) electric field intensity. C [v]) electric flux. D [ ]) magnetic flux density.

68) The unit of electric field intensity is A [v]) N / C. B [ ]) N / Ampere.

C [ ]) F / m

D [ ]) F/ m²

69) 1 Tesla = A [ ]) 1 wb- m² B [v]) 1 wb/ m² C [ ]) 1 wb D [ ]) 1 wb/m.

70) Two parallel plates are separated by a distance of d meter and voltage pap plied across the is V volts. The field intensity is given by A [v]) V / d. B [ ]) V × d² C [ ]) V² D [ ]) V × d.

71) A conductor of length l meters moves at right angles to a uniform magnetic field of flux density B = 1.5 T. if the velocity of revolution of the conductor is 50 ms-1 then induced e.m.f. in the conductor is 75 V. A [v]) 75 V. B [ ]) 0 V. C [ ]) 100 V. D [ ]) 125 V. E [ ]) HINTS- e = Blvsinφ (φ = π/2) e = Blv = 1.5 × 1 × 50 = 75 V magnetic field

72) The magnetism left in the iron after exciting field has been removed is known as

A [ ]) permeance. B [v]) residual magnetism. C [ ]) susceptance. D [ ]) reluctance.

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