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ECAT Physics Chapter 14 Electromagnetism Online Test MCQs With Answers

Question # 1

In a moving coil galvanometer, the deflecting couple depends upon

Choose an answer

area of the coil

number of turns of coil

value of magnetic field

all of the above

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Question # 2

The e/m of an electron moving in a circular path in a magnetic field is equal to

Choose an answer

V/Br

V/B²r²

V²/Br²

V²/Br

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Question # 3

F = I(L x B) is a

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vector

scalar

unit vector

none of these

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Question # 4

Which one of the following relations is correct?

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1 Wb-m²= Nm^-1A^-1

1 tesla = 104 gausses

1 Wb-m²= 1 tesla

All of the above

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Question # 5

The magnetic field in the middle of a solenoid due to current is

Choose an answer

weak

strong and uniform

none-uniform

zero

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Question # 6

If the value of galvanometer constant k = C/BAN is made small, the galvanometer can be made

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Sensitive

Accurate

Stable

None of these

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Question # 7

Amperean path is a:

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Closed path

Rectangular path

Circular path

Any of above

Broken path

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Question # 8

CRO deflects the beam of

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proton

a-particle

electron

neutron

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Question # 9

A current carrying conductor sets up its own:

Choose an answer

Electric field

Nuclear field

Magnetic field

Both (A) and (C)

All of these

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Question # 10

41 The force experience, when proton projected in a magnetic field with velocity 'v' is

Choose an answer

+e(v x B)

-C(V x B)

+e²(v x B)

-e(v²x B)

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Question # 11

The magnetic field inside a solenoid can be increased by:

Choose an answer

Increasing n

Decreasing I

Increasing I

By using iron core within solenoid

All correct except (B)

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Question # 12

Gauss(G) is smaller unit of magnetic induction which is related to tesla(T) as

Choose an answer

IT = 10^-4G

IT = 10⁵G

IT = 10³G

IT = 10⁴G

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