Question # 1

Greater concentration of impurity is added in.

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Base

Emitter

Collector

LED

A transistor has parts:

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2

3

4

5

LDR becomes necessary when op amp is used as a

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Night switch

Inverter

Comparator

Rectifier

OR gate is represented by:

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X = A+B

X=A.B

X=A+B

X=A.B

The open loop gain of the amplifier is order of.

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10⁶

10⁵

10⁷

10³

The chargeless region after formation of Pn junction is called:

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Free region

Depletion region

Field region

U.V region

Base of transistor is of order:

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10^-11m

10⁶m

10^-8m

10^-6m

Minimum number of semi conductor diodes required for full wave rectification are.

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1

2

3

4

A diode characteristics curve is a plot between

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Current and resistance

Voltage and time

Voltage and current

Current and time

The average gap for Germanium at 0K is

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1.12 ev

0.02 ev

6.72 ev

7.2 ev

Which diode works at reverse biasing.

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LED

Photo voltaic cell

Photo diode

Silicon diode

The output voltage of a rectifier is.

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Smooth

Pulsating

Alternating

Per featly direct

The use of LDR is in the circuit of.

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Logic gate

Rectifier

Oscillator

High Switch

NAND gate represented by:

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X = A. B

X = A+B

X= A.B

X=|A+B|

Most of the electrons in the base of an NPN transistor flow:

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Out of the base lead

Into the collector

Into the emit

Into the base supply

Reverse current flows due to

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Majority charge carriers

Minority charge carriers

Electrons

Holes

Conversion of A.C into D.C is called:

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Compton effect

Rectification

Amplification

Pair production

The term invertor is used for.

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NOR gate

XNOR gate

NAND gate

NOT gate

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