1) In half wave rectifiers, diode conducts during a. Only positive half cycle b. Only negative half cycle c. Both positive and negative half cycle d. Neither in positive half cycle nor in negative half cycle
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2) Specific resistance of a material is a. Directly proportional to the both area of cross section and length of material b. Directly proportional to the area of cross section and inversely proportional to the length of material c. Inversely proportional to the area of cross section and directly proportional to the length of material d. Inversely proportional to the both area of cross section and length of material
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3) Which among the following is true about ohm’s law? a. I ∝ V b. I = V/R c. V = IR d. All of these
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4) In any network of wires carrying currents, the algebraic sum of all currents meeting at a point is equal to a. Sum of all the currents b. Zero c. Sum of outgoing current d. Sum of incoming current
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5) Electrical appliances which works on the electromagnetic principle is / are a. Generators b. Motors c. Transformers d. All of these
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6) The materials with permeability less than unity are called a. Diamagnetic materials b. Paramagnetic materials c. Ferromagnetic materials d. Anti ferromagnetic materials
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7) The magnetic materials which are strongly attracted by the magnet is a. Diamagnetic materials b. Paramagnetic materials c. Ferromagnetic materials d. Anti ferromagnetic materials
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8) Permanent magnet are manufactured by a. Copper sulphate b. Iron and cobalt c. Cobalt and nickel d. ALNICO
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9) The direction of magnetic materials when the current passes through the conductor is determined by a. Right hand rule b. Maxwell’s corkscrew rule c. Left hand rule d. Only (a) and (b)
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10) Coulomb’s First Law states that a. Unlike poles attract each other b. Like poles repel each other c. Unlike poles attract each other and like poles repel each other d. The force between two magnetic poles placed in a medium directly proportional to their pole strengths
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11) According to the couloumb’s second law, the force between two magnetic poles placed in a medium is a. Directly proportional to their pole strengths. b. Inversely proportional to the square of the distance between them c. Inversely proportional to the absolute permeability of the surrounding medium d. All of these
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12) The unit of magnetic flux is a. Maxwell b. Weber c. Weber - m d. Only (a) and (b)
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13) Reluctance in a magnetic material is a property by virtue of which it opposes the creation of a. Electric flux b. Magnetic flux c. Electric field density d. Electric lines of force
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14) The unit of magnetizing field intensity is a. Newton / Weber b. Ampere - turns / Weber c. Newton - m / Weber d. Only (a) and (b)
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15) According to the coulomb’s law, the force between two point charges is a. Directly proportional to the product of the charges b. Inversely proportional to the square of the distance between them c. Along the line joining them d. All of these
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16) Electric field intensity is a. Directly proportional to the force applied b. Inversely proportional to the force applied c. Directly proportional to the permittivity d. Inversely proportional to the charge
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17) The equation for electric flux density is given by a. D = εV b. D = εE c. D = ε/E d. D = ε/V
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18) Electric flux density is a function of a. Charge b. Position c. Medium d. Only (a) and (b)
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19) The most common waveforms of ac is a. Square b. Triangular c. Sinusoidal d. Saw tooth
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20) A radian is defined as the central angle, for which length of its arc a. Should be greater than radius b. Should be less than radius c. Should be equal to the radius d. None of these
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