Question # 1

Selenium is

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Insulator is dark

Insulator in light

Conductor in dark

Semi conductor in dark

In photocopier, then drum is coated with layer of.

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Aluminium

Copper

Selenium

silver

A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, Then

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The charge in the plates reduces and potencial difference increase

Potencial difference between the plates increase, stored energy decreases and charge remains the same

Potencial difference between the plates decreases, stored energy decreases and charge remains unchanged

None of them

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 force between two charge is 28 N. If paraffin wax of relative permittivity 2.8 is introduced between the charges as medium, then the force reduces to.

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25 N

20 N

10 N

15 N

Electric potencial of earth is taken to be zero because the earth is good:

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Semiconductor

Conductor

Insulator

Dielectric

The electrical intensity is equal to:

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-Δr/Δv

Δv/Δr

Δv/Δv

-Δv/Δr

If the medium between the charges is not free space then electrostatic force will.be

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Increase

Decrease

Remain same

None of these

Electric flux is a:

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Scalar quantity

Vector quantity

Variable quantity

None of these

One electron volt is equal to.

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1.6 x 10^-19 Joule

1.6 x 10^-19Coulomb

1.6 x 10^-12N

1.6 x 10¹⁸Joule

The quantity time constant RC has units of.

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Charge

Time

Capacitance

Resistance

Special organs called ampullae of lorenzenite are present in.

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Bats

Cats

Dogs

Sharks

Selenium is a

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Insulator

Photoconductor

Conductor

First insulator then conductor

Electric intensity due to an infinite sheet of charge is:

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∂/2ε_∘

∂/rε_∘

∂/r2ε_∘

none of these

Electric field intensity at a point is defined by the relation.

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E= q/F

E = F/q

E = qF

E = F/q2

The work done is bringing a unit positive charge from infinity to that point in an electric field is called.

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Potential

Potential difference

Absolute potential

All of these

Concept of the electric field lines is introduced by

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Coulomb

Faraday

Einstein

Joseph henry

The electric flux through closed surface depends upon

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Charge

Medium

Geometry

Charge and Medium

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