Question # 1

The peak value of alternating current is 5√2 A. The mean square value of current will be:

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5A

2.5A

5√2A

5²

Grid in cathode ray oscilloscope controls.

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Number of electron

Temperature of filament

Frequency of electron

Energy of electrons

The semi conductor diode has the property of

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Two way conduction

Zero conduction

One way conduction

Amplification

Coercive force is used to

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Demagnetize the material

Magnetize the material

Extend it

None of these

Drum of photocopier is made of.

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Copper

Aluminum

Nickel

Cobalt

The unit of impedance is

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Farad

Henry

Tesla

Ohm

An electric field cannot deflect

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X-rays

a-particles

ß-particles

None of these

Metals are good conductors of electricity because they have

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Large number of bounded electrons

Small number of electrons

Large number of free electrons

Small number of free electrons

A block body is an ideal:

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Absorber

Radiator

Both a & b

None of above

A capacitor is perfectly insulator for:

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Direct current

Alternating current

Direct as well as alternating current

None of these

A changing electric flux creates.

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Electric fields

Gravitational

Magnetic field

Electric charge

Production of x rays is reverse process of

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Photo electric effect

Compton effect

An nihilation

Pair production

Cosmic rays consist of

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Protons

High energy photons

Positron

All of above

In RLC circuit the energy is dissipated in

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R only

R and L

R and C

L and C

the current which flows from a point at higher. potential to point at lower potential is called.

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Electric current

Conventional current

Either of these

None of above

Frequency of x-rays depends upon.

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Number of electrons striking target

Accelerating potencial

Nature of the target

Both B and C

If 13.6 eV energy is required to ionize the hydrogen atom, then the required energy to remove an electron from n=2 is:

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10.2 eV

0 eV

3.4 eV

6.8 eV

Energy stored in an inductor is:

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1/2L²I

1/2L²/I

_1/2LI²

1/2LI

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