Question # 1

Automatic function of street light can be done by the use of.

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Inductor

Rectifier

Comparator

emf

In case of reverse biasing, current is flown due to:

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Minority charge carriers

Majority charge carriers

Electrons

Protons

For normal transistor the emitter current can be given by

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I_E = I_C

I_E = I_C + I_B

I_E = I_B

None of these

A transistor has parts:

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2

3

4

5

The circuit of full wave rectification consist of

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Three diodes

Four diodes

Two diodes

One diode

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

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Doping

Temperature

Voltage

Pressure

The impurity in the germinium is usually in the ratio of

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1:10⁶

1:10⁴

1:10⁸

1:10¹⁰

A.C. can be converted into D.C. by

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An oscillator

Detector

An amplifier

Rectifier

Logic gate can control some physical parameters like.

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Temperature, Pressure

Resistance, Inductance

Capacitance, Impedance

Current, voltage

When a PN-Junction is reverse biased the depletion region is.

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Widened

Narrowed

Normal

None of these

LDR becomes necessary when op amp is used as a

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Night switch

Inverter

Comparator

Rectifier

The gate, which changes the logic level to its opposite level is called

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NOR gate

AND gate

OR gate

NOT gate

A diode characteristics curve is a plot between

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Current and resistance

Voltage and time

Voltage and current

Current and time

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

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2

3

4

5

Transistor was invented by:

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Bardeen

Micheal faraday

Lenz

Newton

In photovoltaic cell, current is directly proportional to.

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Wavelength of light

Intensity of light

Energy

Frequency of light

Photo diode detects.

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Visible light

Radio waves

X rays

All of them

The mathematical symbol for NOR operation is

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X = A . B

X = A + D

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