Question # 1

Brightness of screen of CRO controlled by

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Grid

Filament

Anode

Cathode

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 permeability of free space is measured in

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wb A/m

Am/wb

wb/Am

m/wbA

In order to increase sensitivity of galvanometer the value of C may be

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Increase

Decrease

Neither increase nor decrease

Remain same

A sensitive galvanometer is

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Unstable

Stable

Moderate

Both B and C

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

In current carrying long solenoid the magnetic field produced does not depend upon.

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The radius of solenoid

Number of turns per unit length

Current flowing through solenoid

All of the above

The effective way to increase the sensitivity of moving coil galvanometer is.

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Increase the area of coil

Increase the number of turn

Increase the magnetic field

Increase the value of constant C

μ_∘(Ampere's constant) has value.

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4πx10^-7 WbA^-1m^-1

4πx10^-17 Wbm²

4πx10⁷ WbA^-1m^-1

4πx10-27 Wb/m²

The SI Unit of magnetic induction is.

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Weber

Tesla

Gauss

Newton

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

A battery is used in

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ohmmeter

Ammeter

Galvanometer

Voltemeter

The anodes in cathode ray oscilloscope.

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Control number of waves

Control brightness of sept formed

Accelerate as well as focus beam

Negative potential w.r.t to chithode

e/m=

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v/Br

Br/V

VB/r

Vr/B

The Weber is unit of measure of:

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Conductance

Electric current

Magnitic flux

Electric flux

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

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Ammeter

Voltammeter

Ohmmeter

Multimeter

If a charge is at rest in a magnetic field then force on charge is

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Zero

Double

One fourth

Four times

In order to measure potential difference voltmeter is always connected in.

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Series

Parallel

Both a and b

Neither in series nor in parallel

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