Question # 1

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

Dielectric constant _εr for air is:

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1

1.006

1.0002

1.0006

Selenium is a

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Insulator

Photoconductor

Conductor

First insulator then conductor

The middle region of electric field is:

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Maximum field spot

Zero field spot

Perpendicular field spot

All of above

Coulomb's force is:

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Conservative force

None conservative force

Similar to frictional force

None of the above

Special organs called ampullae of lorenzenite are present in.

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Bats

Cats

Dogs

Sharks

If the distance between the two charged bodies is halved, the force between them becomes.

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Double

Half

Four times

One times

Two metallic sphere of radius 2 cm and 4 cm get equal quantity of charge. Which has greater surface charge density ?

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2^nd sphere

Both have same

First sphere

None of these

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

The electrical intensity is equal to:

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-Δr/Δv

Δv/Δr

Δv/Δv

-Δv/Δr

A changing electric flux creates.

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Electric fields

Gravitational

Magnetic field

Electric charge

Identify the practical application of electrostatic force.

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Inkjet printer

x rays

Laser

A.C. Generator

S.I unit of strength of electric field is

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J/C

C/V

V/C

N/C

The total flux through a closed surface.

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Directly proportional to shape and geometry

Independent of medium

Depend on shape and geometry

Dependent on medium and the charge enclosed

A one microfarad capacitor of a TV is subjected to 4000 V potencial difference.The energy stored in capacitor is:

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8 j

16 j

4 x 10^-3j

2 x 10^-3j

If the potential difference across two plates of capacitor is doubled, then energy stored in it will be.

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Two times

Eight times

Four times

Remain same

The "toner" of photocopier is given:

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Positive charge

Negative charge

Remains neutral

All of above

Which one is photo conductor.

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Copper

Selenium

Mercury

Aluminium

The electric potential at a mid point in an electric dipole is.

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0 V

0.5 V

1 V

1.5 V

For computation of electric flux, the surface area should be.

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Parallel

Flat

Curved

Spherical

Intensity of field inside a hollow charged sphere will be.

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Negative

Unaffected

Zero

Maximum

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

The electric intensity due to two oppositely charged plates is

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None of these

An ECG records the _____ between points on human skin generated by electric process i the heart.

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Heart beat

Pulse rate

Pressure

Voltage

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