Question # 1

The process of copying is:

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Axillugraphy

Chromatography

Xerography

Spectrography

A charge Q is divided into tweo parts q and Q-q and seperated by a distance R. The force of equilibrium between them will be maximum when:

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q=Q/4

q=Q/2

q=Q

None of these

In photocopier, then drum is coated with layer of.

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Aluminium

Copper

Selenium

silver

The capacitance of a capacitor depends upon.

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Thickness of plates

Charges on the plates

Voltage applied

Geometry of the capacitor

The number of lines per unit area passing perpendicular through an area is called

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Flux

Electric intensity

Both (a) , (b)

None of these

If the separation between the plates of a capacitor is doubled then its capacitance become.

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Double

Half

One fourth

Three times

The electric field in some region of of space is uniform in magnitude and direction. Which one of the following five statements best desccribes the volume charge density (ρ) , in this region of space?

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ρ = 0

ρ decreases linearly in the direction of the electric field

ρ increases linearly in the direction of the electric field

ρ has a uniform value throughout the region

Selenium is

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Insulator is dark

Insulator in light

Conductor in dark

Semi conductor in dark

Photo copier and inkjet printer are the applications of

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Magnetism

Electricity

`.Electro magnetism

Electrostatics

Which one is photo conductor.

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Copper

Selenium

Mercury

Aluminium

A capacitor stores energy in the form of.

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Magnetic field

Heat energy

Electrical energy

Mechanical energy

A changing electric flux creates.

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Electric fields

Gravitational

Magnetic field

Electric charge

if time constant in RC series circuit is small, then capacitor is charged or discharged.

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Slowly

Rapidly

At constant rate

Intermittently

The negative of the potential gradient is

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Electrostatic force

Electromotive force

Potential difference

Electric field intensity

The product of resistance and capacitanc eis.

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Velocity

Force

Acceleration

Time

Closeness of the electric field lines is the measure of.

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Direction of field

Strength of field

Potential difference

Uniformity of field

If a charge body moved against the electric field it will again

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Potential energy

K.E

Mechanical Energy

Electric potential energy

Selenium is a

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Insulator

Photoconductor

Conductor

First insulator then conductor

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