MDCAT Physics Chapter 9 Electromagnetic Induction Online Test

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  • Chapter NameElectromagnetic Induction
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MDCAT Physics Chapter 9 Electromagnetic Induction Online Test

  • Total Questions20

  • Time Allowed20

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MDCAT Physics Chapter 9 Electromagnetic Induction Online Test

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Question # 1

The number of turns in the primary and secondary coils of a transformer are 100 and 300 respectively. If the input power is 60 W then the output power is:

Question # 2

The induction e.m.f primarily produced at the cost of:

Question # 3

The SI unit of induced emf is:

Question # 4

The induced current can be increased by:

Question # 5

When a transformer is used to stepping up A.C voltage from 100 V to 200 V is connected across 50V D.C mains, then:

Question # 6

A step-up transformer

Question # 7

Such a value A.C current which produces the same heating effect as is produced by the D.C of equal magnitude is called:

Question # 8

A step-up transformer operates on 230V line and supplies a load of 2A. The ratio of primary and secondary turns is 1:25. The current in the primary is:

Question # 9

When the power output in watts equals one half the power input, the efficiency of the transformer becomes:

Question # 10

Direction of induced current always:

Question # 11

The loss of power in transformer occurs due to:

Question # 12

A magnet is allowed to fall through a metal ring. Its acceleration A), during the fall is:

Question # 13

Whenever the magnetic flux linked with a coil changes, there is produced an induced e.m.f. in the circuit. This e.m.f. lasts:

Question # 14

Identify the phenomenon by which an induced emf could be generated:

Question # 15

Why does a transformer have a core made of iron

Question # 16

Lenz’s law deals with the:

Question # 17

The primary winding of a transformer has 500 turns whereas its secondary has 5000 turns The primary is connected to an a.c supply of 20V,50Hz. The secondary will have an output of

Question # 18

When no power is drawn in the secondary coil of an ideal transformer, the power of the primary coil of an ideal transformer, is:

Question # 19

During each cycle, alternating voltage reaches a peak value:

Question # 20

In general, in an ac circuit:

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