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 work is stored in the inductor as

Question # 2

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 # 3

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

Question # 4

When the conductor moved across a magnetic field:

Question # 5

When a conductoris moved across a magnetic field:

Question # 6

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

Question # 7

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:

Question # 8

The direction of induced current is always so as to oppose the cause which produces it. This is

Question # 9

Back emf is produced due to

Question # 10

The induced emf in a coil is proportional to:

Question # 11

For inducting emf in a coil the basic requirement is that:

Question # 12

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

Question # 13

The Phenomenon of generation of induced emf is called

Question # 14

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

Question # 15

Step up transformer has a transformation ratio of 3:2. What is the voltage in secondary, if voltage in primary is 30V:

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ECAT Physics Chapter 15 Important MCQ's

Sr.# Question Answer
1 Which of the following quantities remain constant in step up transformer?
A. Current
B. Voltage
C. Power
D. Heat
2 A coil of constant area is placed in a constant magnetic field. An induced current is produced in the coil when
A. The coil is distorted
B. The coil is rotated
C. The coil is neither distorted nor rotated
D. Both A and B
3 Referring to above figure, current in coil P falls from its maximum value to zero:
A. At the instant the switch is closed
B. At the instant the switch is opened
C. When switch is kept open
D. When switch is kept closed
4 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
5 When a conductoris moved across a magnetic field:
A. Emf induced its similar to that of a battery
B. Emf induced gives rise to induced current
C. An emf is induced across its ends
D. All are correct
6 The direction of induced current is always so as to oppose the cause which produces it. This is
A. Lenz's law
B. Ampere's law
C. Faraday's law
D. Coulomb's law
7 Self inducede e.m.f. is also called
A. Motional e.m.f.
B. Thermistor
C. Electrostatic induction
D. Back e.m.f
8 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
9

An induced current can be produced by:
A. Constant magnetic field
B. Changing magnetic field
C. Varying magnetic field
D. Constant electric field
10 The induced current in the loop can be increased by:
A. Using a stronger magnetic field
B. Moving the loop faster
C. Replacing the loop by a coil of many turns
D. All above

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