Question # 1

Flurescent screen is a screen where visible spot

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vanishes

is made

becomes small and large

none of these

The SI unit of magnetic induction is

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Gauses

Tesla

Weber

Weber²

Total number of turns on 0.15 m length solenoid is 300. the value of n is:

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Greater than 300

Smaller than 300

Equal to 300

Any of (A) or (B)

Any of (A) or(C)

A beam of electrons is provided by an

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electron gun

Suppray

Injection

None of these

When some compass needles are placed on a card board along a circle with the center at the wire, they will

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Point the direction of N-S

Set themselves tangential to the circle

Point in the direction of E-W

None of these

Point in direction of S-E

How many number of anodes used in electron gun

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one

two

three

six

magnetic field is a:

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Vector quantity

Scalar quantity

Scalar as well as scalar quantity

Any of (A) or (B)

Neither (A) nor (B)

If current through conductor is 1 A and length of conductor is 1m placed at right angle to the magnetic field, then the strength of magnetic field is

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F = B²

F = 0

F = B

F = B/2

The SI unit of magnetic flux is.

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weber

Nm^-1A^-1

tesla

gauss

The unit of flux density is also given by

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Weber/m²or Wb . m^-2

Weber/mor Wb . m

Weber/mor Wb . m^-1

Weber or Wb

F = I(L x B) is a

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vector

scalar

unit vector

none of these

The strength of magnetic field around the current conductor is

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Smaller near the conductor

Greater near the conductor

Greater at the large distance from the conductor

Constant near and away from the conductor

Magnetic induction is also called as:

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Ampere’s law

Faraday’s law

Lenz’s law

Newton’s law

Coulomb’s law

The voltage increases linearly with

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time

velocity

acceleration

torque

Hold the solenoid in the right hand with fingers curling in the direction of current. The direction of the field will be given by:

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Thumb

Curled fingers

Middle finger

Arm of right hand

None of these

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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ECAT Physics Chapter 14 Electromagnetism Online Test MCQs With Answers

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