ECAT Pre General Science Physics Chapter 15 Electromagnetic Induction Online Test With Answers

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ECAT Pre General Science Physics Chapter 15 Electromagnetic Induction Online Test

Sr. # Questions Answers Choice
1 The induced current in a conductor depends upon Resistance of the loop Speed with which the conductor moves Any of these Both A and B None of these
2 The Phenomenon of generation of induced emf is called Electrostatic induction Magnetic induction Electromagnetic induction Electric induction Both A and B
3 An induced current can be produced by Constant magnetic field Changing magnetic field Varying electric field Constant electric field None of these
4 An emf is set up in a conductor when it Is kept in a magnetic field Is kept in an electric field Moves across a magnetic field Both A and B None of these
5 The current produced by moving a loop of wire across a magnetic field is called Direct current Magnetic current Alternating current Induced current None of these
6 Which of the following is most suitable as the core of transformer Soft iron Alinco Steel None of these
7 The practical application of the phenomenon of Mutual induction is Transformers Generator Motor All of these
8 A device which converts Electrical energy into mechanical energy is called as Transformer Generator Motor All of these
9 A.C. can be measure with the help of Nuclear effect Magnetic effect Chemical effect Heating effect
10 Split rings act as Vibrator Resistor Motor Commulator
11 The work is stored in the inductor as Electric potential energy Elastic potential energy Magnetic energy Absolute potential energy
12 Self inducede e.m.f. is also called Motional e.m.f. Thermistor Electrostatic induction Back e.m.f
13 The ratio of average e.m.f in the coil tot he time rate of change of current in the same coil is called Mutual induction Mutual inductance Capacitance Self inductance
14 Lens's law deals with the Magnitude of induced current Magnitude of induced e.m.f Direction of induced e.m.f Direction of induced current
15 The motional e.m.f depends upon the Length of a conductor Strength of a magnet Speed of the conductor All of the above
16 Back emf is produced due to Self induction Mutual induction A.C Lenz's law
17 The SI unit of magnetic induction is Weber Weber/meter Henry Tesla
18 Transformer is used to Increase alternating current Increase d.c voltage Increase & Decrease emf All answers are right
19 Lenz's law is the consequence of Mass Energy conservation Momentum conservation Charge
20 The change of magnetic flux through a circuit will produce Magnetic Field Electric Field emf a.c
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