Question # 1

Tick the correct statement:

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Both the potential and potential difference is scalars

Potential is a scalar but potential difference is a vector

Both are vectors

Potential is vector but potential difference is scalar

None of these

When two spherical conducting balls at different potentials are joined by a metallic wire, after some time:

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Both the conductors are at the same potential

Potential difference across the conductors remain constant

Potential difference across the conductors becomes zero

Both (A) and (B)

Both (A) and (C)

The fourth band is a:

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Silver band

Red band

Gold band

Either A or C

Either A or B

The strength of magnetic field at certain points around a wire depends upon:

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Value of current passing

Distance from the current element

Color of the material

Both (A) and (B)

Both (B) and (C)

The conventional current is the name given to current due to flow of

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Positrons

Positive charges

Negative charges

Both A and C

None of these

The surface destiny of charge is defined is:

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Charge per volume

Mass per volume

Charge per area

Mass per area

Both (B) and (C)

An inkjet printer uses in its operation:

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Neutrons only

Mesons only

Positrons and photons

An electric charge

None of these

When a constant potential difference is applied across the conductor, the drift velocity of electrons:

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Increases

Decreases

Remains the constant

Either of these

None of these

An ideal voltmeter has:

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Zero resistance

Small resistance

Large resistance

Infinite resistance

Both A and B

Which instrument is expensive and difficult to use?

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Voltmeter

Potentiometer

CRO

Both A and C

Both A and B

The effects of bends in a wire on its electrical resistance are:

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Zero

Much larger

Larger

Smaller

None of these

Electrolysis is the study of conduction of electricity through:

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Solids

Liquids

Gases

Plasma

Electric flux is:

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Cross product of two vector

Dot product of two vectors

A vector quantity

A scalar quantity

Both (B) and (D)

The free electrons in metals:

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Are in random motion and their speed depends upon temperature

Move in particular direction

Move with speed of light

Move such that their speed does not depend on their temperature

None of these

An electric field is generated along the wire when:

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Its resistance is very high

A constant potential is maintained across the wire

Net current through the wire is zero

A constant potential difference is maintained across the wire

Either (A) or (D)

An important part of photocopier is:

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Toner cartridge

Deflection plates

Charging electrode

Print head

None of these

A thermistor is a resistor which is:

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Light Sensitive

Heat Sensitive

Sound Sensitive

All of these

None of these

Electric field lines emerge from the charge in:

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One dimension

Two dimensions

Three dimensions

Four dimensions

None of them

Another mean of electric potential energy per unit charge is given by:

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Electric intensity

Potential gradient

Electric Flux

Potential difference

None of these

A field free region is found:

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Near the outer surface of a hollow charged metal sphere

In the interior of solid metal uncharged sphere

In the interior of solid metal charged sphere

Both (A) and (B)

Both (A) and (C)

An example of photoconductor is:

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Boron

Carbon

Iron

Aluminum

Selenium

When certain area A is held parallel to the field lines, then:

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No lines cross this area

Maximum lines pass through this area

The number of lines are between zero and maximum

Both (A) and (B) correct

None of these

As the current flows through the wire

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It generates heat in the wire

It produces sound in the wire

Resistance of the wire decrease

Voltage across the ends is the increase

None of these

The earth’s potential and potential at infinity are taken:

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Equal

Zero

First is greater than the second

Second is greater than the first

Both (A) and (B)

In order to have a constant current through wire, the potential difference across its end should:

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Be zero

Be maintained constant

Goes on increasing

Go on decreasing

Both (A) and (B)

The conventional current is the name given to current due to flow of:

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Positrons

Positive charges

Negative charges

Both (A) and (C)

None of these

When two spherical conducting balls at different potentials are joined by metallic wire, the current starts:

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Decreasing from zero to maximum

Increasing from zero to maximum

Decreasing from maximum to zero

Increasing from maximum to zero

Both (A) and (D)

The magnitude of chemical Effects depends upon:

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Nature of liquid

Quantity of Electricity passed through the liquid

Color of the liquid

Both (A) and (C)

Both (A) and (B)

Aluminum is a:

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Good insulator

Bad conductor

Both (A) and (B)

Excellent conductor

Semiconductor

The obvious effect/s of current is/are:

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Heating effect

Magnetic effect

Chemical effect

Both (C) and (B)

All of these

The quantity having the same unit as that of emf is:

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Force

Energy

Potential

Current

Charge

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