Question # 1

What is emitted by the hot metal filament in a cathode ray tube.

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Alpha particles

Electrons

Protons

X rays

A single silicon photovoltaic cell produces a current of the order of.

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A few miliamperes

10² A

10³ A

10⁴ A

Which of the following is an example of induced magnetism.

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A compass needle pointing north

A north pole attracting iron filings

A northpole repelling a north pole

The coil of a motor turning in a magnetic field.

A wire surrounded by a concentric cylindrical metal shield constitutes a.

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Spherical capacitor

Parallel plate capacitor

Cylindrical capacitor

Cylindrical condenser

What units are used to rate electrical fuses.

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Volts

Ampere

Watts

Hertz

What is the range of values of power factor.

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0 to -1

0 to +1

0 to 2

2 to 3

What is the term for an motion of charge from one region to another.

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electric charge

Electric current

Electric field

Electric potential

Since a diode permits the flow of current only in one direction so it can be used as.

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An oscillator

A rectifier

A phot deflector

A transistor

Efficiency of a half wave recitifier is.

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Almost negigible

More than full wave rectifier

Less than full wave rectifier

Equal to full wave rectifier

_{When a charged particle moves through a magnetic field it suffers a change in its}

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Charge

Mass

Energy

Direction of motion

A type of resistor whose resistance varies significantly with temperature is.

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Thermistor

Thermocouple

Strain gauge

Potentiometer

On which of the following parameters the amount of charge that can be placed on a conductor does not depend on.

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Its capacitance

Its size or shape

its potential

Dielectric strength of the surrounding medium

Mutual inductance has a practical role in the performance of the

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Radiochoke

Transformer

Generator

Trnasistor

The sum of positive and negative peak values are usually written as.

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rms value

p-p value

Peak value

Instantaneous value

The direction of induced e.m.f in a circuit is in accordance with conservation of.

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Mass

Charge

Momentum

Energy

Where is the velocity of electrons maximum in a diode.

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Near the cathode

Near the anode

In the space ini between the two elecrode.

It is same throughout the tube

Which materials have exactly zero electrical resistivity.

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Metals

Insulators

Semi conductors

Super conductors

In a galvanometer the enameled copper wire is wound on.

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An insulator

A non magnetic material

A magnetic material

A conductor

In a n-type material there is an excess of.

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Free electrons

Holes

Quarks

Measons

The material of an electromagnet should have high

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Permeability

susceptibility

Retentivity

Hysteresis loss

A material in which resultant magnetic moment is zero.

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Diamagnetic

Paramagnetic

Ferromagnetic

Anti ferromagnetic

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