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MCQs 1: Electrical work is

Directly proportional to the potential difference Directly proportional to the charge Directly proportional to the current All of these
Answer Explanation

MCQs 2: If a current of 5A flows through a resistor of 12 ohm then the power developed and the energy dissipated in 2 minutes are

300 W, 36000 J 360 W, 30000 J 380 W, 35000 J 380 W, 36000 J
Answer Explanation

MCQs 3: The unit of electrical energy is / are

Joules Watt - sec Kilowatt - hour All of these
Answer Explanation

MCQs 4: If a number of resistors are connected in parallel, then the reciprocal of total resistance is equal to

Sum of individual resistances Sum of the reciprocal of individual resistances Reciprocal of the sum of individual resistances All of these
Answer Explanation

MCQs 5: Permeability of a material is

Directly proportional to both flux density and magnetizing force Directly proportional to flux density and inversely proportional to the magnetizing force Directly proportional to the magnetizing force and inversely proportional to the flux density Inversely proportional to both flux density and magnetizing force
Answer Explanation

MCQs 6: The amount of flux density set up in the core is dependent upon

Current No. of turns, cross sectional area of core Materials of the magnetic core, length of core All of these
Answer Explanation

MCQs 7: When a solenoid attracts an iron bar,

They leave the south pole to go around to the north pole They leave the north pole to go around to the south pole They leave the north pole to go to infinity They leave the south pole to go to the infinity
Answer Explanation

MCQs 8: If two conductors carrying currents in opposite direction are placed parallel to each other then the magnetic field set up by the conductors

Attract each other Repels each other Perpendicular to each other Parallel to each other
Answer Explanation

MCQs 9: According to the End Rule, the current directions when looked from one end of the coil if that end is South Pole and if the end is North Pole are

Both clockwise Anticlockwise, clockwise Clockwise, anticlockwise Both anticlockwise
Answer Explanation

MCQs 10: When the flux crosses the air gap, it bulges outward at the ends of the air gap and the flux density in the air gap is reduced. This is known as

Leakage flux Fringing Relative permeability Magnetizing force
Answer Explanation

MCQs 11: The induced emf sets up the direction of current in such a way that the magnetic field produced by it

Supports the cause producing it Opposes the cause producing it Increases Decreases
Answer Explanation

MCQs 12: Which among the following sentences is correct?

Lenz’s law is used to find the direction of induced current Fleming’s right hand rule is used to find the direction of induced current Fleming’s left hand rule is used to find the direction of force All of these
Answer Explanation

MCQs 13: If the magnetic field is stationary and the conductor is in motion then the emf induced is called

Dynamically induced emf Statically induced emf Self induced emf Mutually induced emf
Answer Explanation

MCQs 14: “ Total electric flux through any closed surface is equal to the charge enclosed by that surface ”. This is

Lenz’s law Gauss’s law Maxwell’s law Faraday’s law
Answer Explanation

MCQs 15: Gauss’s law is applicable for

Only point charge Infinite line charge Infinite sheet of charge All of these
Answer Explanation

MCQs 16: The potential difference between two points is given by

V = E / Q V = W / Q V = Q / E V = Q / W
Answer Explanation

MCQs 17: For forming an electric dipole between two point charges separated by a small distance, the two point charges are of

Unequal magnitude and opposite sign Unequal magnitude but same sign Equal magnitude and same sign Equal magnitude but opposite sign
Answer Explanation

MCQs 18: The amount of work done in moving a charge from one point to another along an equipotential line or surface charge is

Zero Infinity One Two
Answer Explanation

MCQs 19: A vector quantity has

Only magnitude Only direction Both (a) and (b) None of these
Answer Explanation

MCQs 20: If the number of turns, area and current of an ac circuit is doubled then the new inductance will be

Equal to the former Twice of the former Four times the former Half of the former
Answer Explanation

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