Question # 1

The Grid 'G' in cathode ray oscilloscope.

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Accelerate as well as focus electron beam

Control no. of electrons beam

Is at - Ve potential with respect to cathode.

Both d and b

Galvanometer is sensitive when C/BAN is

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zero

Large

small

Negative

If a low resistance is connected parallel to a galvanometer then galvanometer is converted.

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Ammeter

Voltammeter

Ohmmeter

Multimeter

A voltmeter is always connected in

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Parallel

Series

Perpendicular

Straight line

Shunt resistance is

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Low resistance

Zero resistance

High resistance

Impedance

Two parallel wires carrying currents in the opposite direction.

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Repel each other

Attract each other

Have no effect upon each other

They cancel out their individual magnetic fields.

An electron moves at 2 x 10² m/sec perpendicular to magnetic field of 2T what is the magnitude of magnetic force:

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1 x 10^-6 N

6.4 x 10^-17 N

3.6 x 10^-24 N

4 x 10⁶ N

Sensitivity of a galvanometer can be increased by

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Decreasing the value of torsional couple

Decreasing number of turns

Decreasing area of plane of coil

Decreasing magnetic field

Torque on a current carrying coil

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τ=IBA cos

τ = ILB sinα

τ = IBA sinα

τ = ILBcosα

To convert a galvanometer into a volt meter a high resistance is connected.

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In series

In parallel

In perpendicular

Along tangent

The sum of electric and magnetic force is called.

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Maxwell force

Lorentz force

Newton's force

Centripetal force

For accurate measurement of current through a circuit, the resistance of ammeter should be

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Very small

Very high

Neither small nor high

None of the above

CRO works by deflecting the beam of electron as they pass through

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Uniform magnetic field

Uniform electric field between two sets of parallel plates

Non-uniform magnetic field

None of these

The torque in the coil can be increased by increasing:

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No. of turns

Current and magnetic field

Area of coil

All of the above

To convert a galvanometer into an ammeter, we connect with it a

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Shunt resistance

Low value parallel

Low value by pass resistor

All of above

The magnetic field inside solenoid is given:

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μ_∘nI²

μ_∘nI

μ_∘n/1²

μ_∘I/n

The Weber is unit of measure of:

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Conductance

Electric current

Magnitic flux

Electric flux

The value of e/m is smallest for

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Proton

Electron

Beta particle

Positron

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Physics FSC Part 2 Chapter 14 Online MCQ's Test MCQs With Answers

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