Question # 1

For accurate measurement of current through a circuit, the resistance of ammeter should be

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Very small

Very high

Neither small nor high

None of the above

Production of x rays is reverse process of

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Photo electric effect

Compton effect

An nihilation

Pair production

For electromagnetic waves, Maxwell generalized

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Gauses law for magnetism

Gauses law for eletricity

Fradays law

Amperes law

Minority carriers in P-Types , substances are.

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Electrons

Protons

Holes

Neutrons

The value of e/m is smallest for

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Proton

Electron

Beta particle

Positron

In current carrying long solenoid the magnetic field produced does note depend upon

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The radius of solenoid

Number of turns per unit length

Current flowing through solenoid

All of above

The main use of A.C is

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Minimum line losses

Long distance transmission

Stepping up to required voltage only

Steeping down to required voltage only

Gauss's law can only be applied to.

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A curved surface

A flat surface

A closed surface

A surface of any shape

The most suitable metal for making permanent magnet is.

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Iron

Aluminium

Steel

Copper

If an electron is prijected in a magnetic field with velocity V, it will experience a force

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The chargeless region after formation of Pn junction is called:

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Free region

Depletion region

Field region

U.V region

Which one pair belongs to acceptor impurity.

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Aresincl, phosphorus

Boron, gallium

Arsenic, antimony

Antimony, indium

A capacitor is perfect in insulator for.

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Alternating current

Sparking current

Eddy current

Direct current

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

Output of D.C. motor is

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A.C. energy

Mechanical energy

Chemical energy

D.C. energy

A galvanometer is an electrical instrument used to

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Measure resistance

Measure voltage

Detect passage of current

None of these

Life time of metastable states is

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10^-6 sec or more

10^-3 sec or more

10^-5 sec or more

None of these

Which one of the following resistance is used to convert a Galvanometer into an ammeter.

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High resistance

Low resistance in series with galvanometer

Shunt

High resistance in series with galvanometer

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