Question # 1

An electromagnetic wave goes from air to glass which of the following does not change?

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Radio waves

X-rays

Ultra violet radiation

Ultra sond waves

Energy produced due to fission of uranium atom is:

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500MeV

200MeV

700MeV

750MEV

Capacitance of a capacitor does not depend upon.

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Distance between plates

Area of plates

Electric field between plates

Medium between plates

Coercive force is used to

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Demagnetize the material

Magnetize the material

Extend it

None of these

In frequency modulation which factor changed.

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Amplitude of charge carriers

Frequency of charge carriers

Amplitude of signal

Frequency of signal

The process of copying is:

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Axillugraphy

Chromatography

Xerography

Spectrography

In full wave rectification number of diodes required are equal to.

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2

3

4

5

The critical temperature of mercury is.

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1.18 K

4.2 K

3.72 K

7.2 K

Minority carriers in P-Types , substances are.

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Electrons

Protons

Holes

Neutrons

The magnitude of back emf:

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Increases with sped of motor

Decreases with speed of motor

Remains same

None of above

The "toner" of photocopier is given:

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Positive charge

Negative charge

Remains neutral

All of above

The photo copying process is called

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Xerography

Inkjet Printer

Both (a) and (b)

None of these

SI unit of reactance is.

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Ohm

Mho

Farad

Henry

The first laser was built by

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ArthursSchawalow

T.H.Maiman

Peter Sorokin

C.H.Townes

The position has charge which is in magnitude equal to the charge on

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Electron

Proton

β particle

All

In modulation, low frequency signal is known as

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Carrier wave

fluctuated signal

Modulated carrier signal

Modulation signal

In A.C. generator , when plane of coil is perpendicular to magnetic field, then output of generator is.

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NwAB

2pi f

Maximum

Zero

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Lenz's law

Faraday's law

Ampere's law

None of these

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