Question # 1

Which electrical component uses a low current circuit to switch a high current ON or OFF.

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Capacitor

Diode

Reed rely

Thermistor

The force exerted by two charged bodies on another obeys Coulomb's law provided that

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Both bodies are in the same medium

the charges are not too great

On body does not lie inside the other

The linear dimensions of the body are very much less than the distance between the bodies.

Which device converts alternating current to direct current.

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Motor

Generator

Transformer

Rectifier

A substance which has empty conduction band.

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Insulator

Conductor

Semi conductor

super conductor

Which electrical quantity has the same units as electromotive force.

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Charge

Current

Potential difference

Power

Why a positive charged object is made neutral by someone touching it.

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Electrons flow from the object

Proton flow onto the object

Protons flow from the object

Proton flow onto the object

When a direct current is passed though a junction formed of two dissimilar metals the junction becomes warmer or cooler depending on the.

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Current direction

Thermocouple used

Temperature gradient

Amount of current

The capacity of a spherical conductor is numerically equal to its.

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Surface area

Diameter

Radius

Volume

In order to measure the true emf of an electrolytic cell it is necessary that.

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The measurement be made while charging the cell

No current be drawn from the cell

The cell be connected into a type circuit

The cell be connected into a parallel type circuit

A capacitor is prefect insulator for

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Direct current

Alternating current

Direct as well as alternating current

Pulsating current

The charge per unit volt which is a constant property of the system is known as the

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Dielectric constant

Permitivity

Capactance

Inductance

Which one of the following describes a measure of opposition to alternating current.

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Electrical impedance

Capacitance

Inductance

Admittance

A number of spherical capacitors of different radii have same potentials The surface charge density on them

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I equal

Is proportional to their radii

Is inversely proportional to their radii

Is inversely proportional to square of their radii

The circuit in which current and voltage are in phase the power factor is.

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Zero

Unity

Double

4 times

What for is semiconductor diode used.

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To convert D.C. to A.C.

To convert A.C. to D.C.

To increase voltage

To decrease voltage

The terminals of a battery are joined by a length of resistance wire Which change on its own will increase the current though the battery.

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Connecting the wire with plastic insulation

Covering the wire with plastic insulation

Using a shorter wire of the same material and the same thickness

Using a thinner wire of the same material and the same thickness

Two unchanged objects A and B are rubbed against each other, when object B is placed near a negatively charged object C the two objects repel each other Which of these statements is true abut object A.

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It remains uncharged

It becomes positively charged

It becomes negatively charged

It is unpredictable

The process of converting A.C and D.C. is known as

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Amplification

_Filtration

Rectification

Saturation

The materials whose resistivity becomes zero below a certain temperature.

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Semi conductors

Super conductors

Insulators

conductors

In electric magnetism , the additional fundamental quantity that is chosen as a basic unit is called.

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Electric potential

Electric fierce

Electric charge

Magnetic force

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