Question # 1

For automatic Switching of streetlight, the op amplifier is used as.

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Inductor

Converter

Comparator

Thermistor

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

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Widened

Narrowed

Normal

None of these

One use of a single p-n junction semiconductor in an electrical circuit is a

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Rectifier

Transistor

Battery

Diode

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

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1

2

3

4

The output from a full wave rectifier is

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An ac voltage

A dc voltage

Zero

A pulsating unidirectional voltage

Which one has greater cone of impurity among all:

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Emitter

Base

Collector

All are pure

Which component of the transistor has greater contrition of impurity.

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Base

Emitter

Collector

Emitter and collector

In case of op-amp as an inverting amplifier, V₊ - V_- = 0, this is because

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Open gain loop is very low

Closed loop gain is very high

Open loop gain is very high

Both (a) and (a)

Truth table of logic function.

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Summarize its output values only

Tabulates all its input conditions only

Display all its input and output possibility

Is not base on logic algebra

The input resistance of an op amplifier is.

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Low

High

Zero

Equal to output resistance

The symbol of p-n-p transistor is

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In a certain circuit, I_{B = 40 µA,}I_C= 20 mA

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450 amp

0.45 amp

5 m amp

500 amp

The P.D develop in case of silicon is:

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0.7V

0.3V

0.5V

0.9V

The use of LDR is in the circuit of.

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Logic gate

Rectifier

Oscillator

High Switch

A PN junction can not be sued a.

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Rectifier

Amplifier

Detector

LED

Reverse current flows due to

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Majority charge carriers

Minority charge carriers

Electrons

Holes

Which device is used as a rectifier?

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Capacitor

Transistor

Diode

Transformer

An expression for gain of an inverting amplifier is

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(R₁R₂)

None of these

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