Question # 1

The peak to peak value of alternating voltage is

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2V_o

V_o

None of these

The unit of impedance is.

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Henry

Hertz

Ampere

Ohm

Number of electros emitted in photo electric effect depend upon.

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Intensity of incident light

Frequency of incident light

Energy of incident light

Wavelength of incident of light

The product of resistance and capacitanc eis.

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Velocity

Force

Acceleration

Time

The potential difference across depletion region in case of Si is

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0.6 volt

0.9 volt

0.7 volt

0.2 volt

In photocopier, then drum is coated with layer of.

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Aluminium

Copper

Selenium

silver

A proton is about 1840 time than an electron. When it is accelerated by a potencial difference if 1 kV, its kinetic energy will be:

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1884 ke V

1/1840 keV

1 keV

920 keV

For rectification we use.

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Transformer

Diode

Choke

Generator

The value of maximum output power is?

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E/4R

E²/4R

E/4R²

Non of above

The colour of light emitted by a LED depends on.

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It forward biased

Its reverse biased

Unbiased

None of these

Which factor does not affect the conductivity of PN-Junction diode.

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Doping

Temperature

Voltage

Pressure

The device which allows only the continuous flow of AC through it is.

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Inductor

Battery

Thermistor

Capacitor

Which one of the following is crystalline solid.

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Zirconia

Glassy solid

Natural rubber

Poly strene

Balmer Empirical formula explains the electromagnetic radiation of any excited atom in terms of their.

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Energy

Mass

Wave length

Momentum

Insulators have:

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An empty conduction band

Al full valence band

A large energy gap

All of above

One of the applications of electrostatic induction is

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Laser

Photocopier

X ray machine

Wilson cloud chamber

Potentiometer is used to.

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Compare emf of two cells

Detect internal resistance of cell

Measure P.D.

All of these

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