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

Lenz's law is the consequence of

Question # 2

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

Question # 3

Referring to above figure, due to change in current in the coil P, the change in magnetic flux:

Question # 4

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

Question # 5

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

Question # 6

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

Question # 7

Faraday's law of electromagnetic induction has been used in the construction of:

Question # 8

The induced emf in a coil is proportional to:

Question # 9

When the conductor moved across a magnetic field:

Question # 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:

Question # 11

Motional emf is called motional:

Question # 12

An induced current can be produced by:

Question # 13

Eddy current is produced when:

Question # 14

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

Question # 15

When there is no relative motion between the magnet and coil, the galvanometer indicated

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ECAT Physics Chapter 15 Important MCQ's

Sr.# Question Answer
1 The law of electromagnetic induction is related to:
A. Coulomb
B. Ampere
C. Faraday
D. Lenz
2

An induced current can be produced by:
A. Constant magnetic field
B. Changing magnetic field
C. Varying magnetic field
D. Constant electric field
3 Back emf is produced due to
A. Self induction
B. Mutual induction
C. A.C
D. Lenz's law
4 Which of the following is most suitable as the core of transformer
A. Soft iron
B. Alinco
C. Steel
D. None of these
5 A coil of constant area is placed in a constant magnetic field. An include current is produced in the coil when:
A. The coil is destroyed
B. The coil is Rotated
C. The coil is neither destroyed nor rotated
D. Both (A) and (B)
6 The rate change of area expressed is expressed in:
A. None of these
B. ms-1
C. m2s-2
D. ms-2
7 When there is no relative motion between the magnet and coil, the galvanometer indicates:
A. No current in circuit
B. An increasing current
C. A decreasing current
D. Either B or C
8 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?
A. 2 H
B. 3 H
C. 1/2 H
D. Zero
9 Which of the following quantities remain constant in step up transformer?
A. Current
B. Voltage
C. Power
D. Heat
10 The current produced by moving a loop of a wire across a magnetic field is called:
A. Direct current
B. Magnetic current
C. Alternating current
D. Induced current

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