ECAT Pre Computer Science Chapter 15 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 15 Electromagnetic Induction

Try The MCQ's Test For ECAT Physics Chapter 15 Electromagnetic Induction

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ECAT Physics Chapter 15 Electromagnetic Induction

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Question # 1

The ratio of average e.m.f in the coil tot he time rate of change of current in the same coil is called

Question # 2

A coil of constant area is placed in a constant magnetic field. An induced current is produced in the coil when:

Question # 3

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?

Question # 4

The current produced by moving a loop of a wire across a magnetic field is called:

Question # 5

Referring to above figure, current in the coil P grows from zero to its maximum value:

Question # 6

A coil of constant area is placed in a constant magnetic field. An include current is produced in the coil when:

Question # 7

The phenomenon of generation of induced emf is called:

Question # 8

In the equilibrium state, the potential difference between two ends of the conductor moving across a magnetic field is called:

Question # 9

The device in which induced emf is statically induced emf is:

Question # 10

When a conductor moved with its length parallel to the lines of magnetic fled:

Question # 11

Motional emf is called motional:

Question # 12

Instead of moving the coil towards a magnet, the magnet is moved towards the coil with the same speed. The galvanometer shows current:

Question # 13

Back emf is produced due to

Question # 14

An induced current can be produced by:

Question # 15

The induced emf in a coil is proportional to:

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ECAT Physics Chapter 15 Important MCQ's

Sr.# Question Answer
1 The magnitude of induced emf depends upon the:
A. Rate of decrease of magnetic field
B. Rate of change of magnetic field
C. Rate of increase of magnetic flux
D. Constancy of magnetic field
2 The induced current in the loop can be increased by:
A. Using a strong magnetic field
B. Moving the loop faster
C. Replacing the loop by a coil of many turns
D. All of above
3 In the equilibrium state, the potential difference between two ends of the conductor moving across a magnetic field is called:
A. Both A and C
B. Induced emf
C. Both A and B
D. Motion emf
4 Motional emf is called motional:
A. Electromagnetic force and is measured in newtons
B. Electromotive force and is measured in volt
C. Electromotive force and is measured in newtons
D. Electromagnetic force and is measured in volts
5 When a conductor is moved across a magnetic field, the redistribution of charge sets up:
A. Magnetic field
B. Electrostatic field
C. Electromagnetic field
D. All of these
6 The practical application of the phenomenon of Mutual induction is
A. Transformers
B. Generator
C. Motor
D. All of these
7 The induced emf in a coil is proportional to:
A. Magnetic flux through a coil
B. Rate of change of magnetic flux through the coil
C. Area of the coil
D. Product of magnetic flux and area of the coil
8 An emf is set up in a conductor when it:
A. is kept in a magnetic field
B. is kept in a electric field
C. Move across a magnetic field
D. Both (A) and (B)
9 Step up transformer has a transformation ratio of 3:2. What is the voltage in secondary, if voltage in primary is 30V:
A. 45 V
B. 15 V
C. 90 V
D. 300 V
10 A square loop of wire is moving through a uniform magnetic field. The normal to the loop is oriented parallel to the magnetic field. The emf induced in the loop is:
A. Zero
B. Of smaller magnitude
C. Of larger magnitude
D. Sometimes B, sometimes C

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