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 Instead of moving the coil towards a magnet, the magnet is moved towards the coil with the same speed. The galvanometer shows current: Of same magnitude in the same direction Of different magnitude in the same direction Of same magnitude but in opposite direction Of different magnitude in the opposite direction None of these
2 When there is no relative motion between the magnet and coil, the galvanometer indicates: No current in circuit An increasing current A decreasing current Either B or C
3
The magnitude of induced emf depends upon the:		 Rate of decrease of magnetic field Rate of change of magnetic field Rate of increase of magnetic flux Constancy of magnetic field None of these
4 Micheal Faraday and joseph Henry belong respectively to: USA and England England and France England and USA USA and France None of these
5 In magnet-coil experiment, emf can be produced by: Keeping the coil stationary and moving the magnet Keeping the magnet stationary and moving the coil Relative motion of the loop and magnet Any one of above All above
6 The induced current in the loop can be increased by: Using a strong magnetic field Moving the loop faster Replacing the loop by a coil of many turns All of above None of these
7 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
8 The phenomenon of generation of induced emf is called: Electrostatic induced Magnetic induced Electromagnetic induced Electric induced Both A and C
9

An induced current can be produced by:

 <span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">Constant magnetic field</span> <span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">Changing magnetic field</span> <span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">Varying magnetic field</span> <span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">Constant electric field</span> <span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">None of these</span>
10 An induced current can be produced by: Constant magnetic field Changing magnetic field Varying magnetic field Constant electric field None of these
11 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
12 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
13 Eddy current is produced when: A metal is kept in varying magnetic field A metal is kept in steady magnetic field A circular coil is placed in a steady magnetic field A current is passed through a circular coil
14 Step up transformer has a transformation ratio of 3:2. What is the voltage in secondary, if voltage in primary is 30V: 45 V 15 V 90 V 300 V
15 Which of the following quantities remain constant in step up transformer? Current Voltage Power Heat
16 In a coil current change from 2 to 4 A in .05 s. If the average induced emf is 8V then coefficient of self-inductance is: 0.2 henry 0.1 henry 0.8 henry 0.04 henry
17 The induced emf in a coil is proportional to: Magnetic flux through a coil Rate of change of magnetic flux through the coil Area of the coil Product of magnetic flux and area of the coil
18 What is the coefficient of mutual inductance, when the magnetic flux changes by 2 X 10-2Wb, and change in current is 0.01 A? 2 H 3 H 1/2 H Zero
19 The device in which induced emf is statically induced emf is: Transformer AC generator Alternator Dynamo
20 For inducting emf in a coil the basic requirement is that: Flux should link the coil Change in flux should link the coil Coil should form a closed loop Both B and C are true
21 Referring to above figure, due to change in current in the coil P, the change in magnetic flux Is associated with coil P Is associated with coil S Causes and induced current in coil S All of these None of these
22 Referring to above figure, current in coil P falls from its maximum value to zero At the instant the switch is closed At the instant the switch is opened When switch is kept open When switch is kept closed None of these
23 Referring to above figure, current in the coil P grows from zero to its maximum value At the instant the switch is closed At the instant the switch is opened When switch is kept open All of above Neither of above
24 A coil of constant area is placed in a constant magnetic field. An induced current is produced in the coil when The coil is distorted The coil is rotated The coil is neither distorted nor rotated Both A and B None of these
25 Instead of moving the coil towards a magnet, the magnet is moved towards the coil with the same speed. The galvanometer shows current Of same magnitude in the same direction Of different magnitude in the same direction Of same magnitude but in opposite direction Of different magnitude in the opposite direction None of these
26 When there is no relative motion between the magnet and coil, the galvanometer indicated No current in the circuit An increasing current A decreasing current A constant current Either B or C
27 The magnitude of induced emf depends upon the Rate of decrease of magnetic field Rate of change of magnetic field Rate of increase of magnetic flux Constancy of magnetic field None of these
28 Michael Faraday and Joseph Henry belong respectively to USA and England England and France England and USA USA and France None of these
29 In magnet-coil experiment, emf can be produced by Keeping the coil stationary and moving the magnet Keeping the magnet stationary and moving Relative motion of the loop and magnet Any one of above All above
30 The induced current in the loop can be Increased by Using a stronger magnetic field Moving the loop faster Replacing the loop by a coil of many turns All above Both A and B
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