Question # 1

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)

The electric flux through any surface depends upon:

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Intensity of electric field

Area of the surface

Angle between intensity and area

All of these

None of these

The third band of the colour code:

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Gives the number of zeroes

Is decimal multiplier

Gives the resistance tolerance

Gives the third digit

Both (A) and (B)

An important part of photocopier is:

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Toner cartridge

Deflection plates

Charging electrode

Print head

None of these

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

An important part of inkjet printer is:

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Toner

Drum

Deflection plates

Heated roles

None of these

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 number of field lines passing through unit area held perpendicular to the field lines represent:

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Flux in that region

Intensity of the field

Charge

Area of the region

None of these

The charge carriers in an electrolyte are

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Positive ions

Negative ions

Either A or B

Both A and B

Neither A nor B

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)

An example of photoconductor is:

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Boron

Carbon

Iron

Aluminum

Selenium

Selenium is:

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An insulator

A conductor

Insulator in the dark and becomes conductor when exposed to light

Conductor in the dark only

None of these

Gaussian surface is always:

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Rectangular

Spherical

Cylindrical

Box shape

Any of these

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)

Two dissimilar metals joined at their ends kept at constant temperature constitute:

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Cell

Voltmeter

Thermocouple

Potentiometer

None of these

The charge carries in the electrolyte are:

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Positive ions

Negative ions

Either (A) or (B)

Both (A) and (B)

Neither (A) nor (B)

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)

Electric field lines emerge from the charge in:

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One dimension

Two dimensions

Three dimensions

Four dimensions

None of them

The example/s of non-electrical energy to electrical is/are:

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Chemical energy

Mechanical energy

Heat energy

Both (A) and (B)

All of these

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

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Zero

Much larger

Larger

Smaller

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 fourth band is a:

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Silver band

Red band

Gold band

Either A or C

Either A or B

Which instrument is expensive and difficult to use?

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Voltmeter

Potentiometer

CRO

Both A and C

Both A and B

Static electricity is produced by the transfer of:

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Electrons

Protons

One fluid

Two fluids

None of these

Most practical applications of electricity involve

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Charges at rest

Charges in motion

Electrons at rest

Atoms in motion

Molecules in motion

Field lines are closer to each other in the region where the field is:

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Stronger

Weaker

Much weaker

Absent

None of these

The positive charge moving in one direction is equivalent in all external affects to a:

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Negative charge is moving in the same direction

Positive charge is moving in the opposite direction

Negative charge moving in the opposite direction

Positive charges moving in the same direction

None of these

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

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

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Force

Energy

Potential

Current

Charge

Which of the following substances has got positive temperature coefficient of resistance?

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Carbon

Germanium

Silicon

Aluminium

None of these

In case of metallic conductors, the charge carriers are

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Protons

Electrons

Antiprotons

Positrons

Both A and B

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