Question # 1

LDR becomes necessary when op amp is used as a

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Night switch

Inverter

Comparator

Rectifier

Which one has greater cone of impurity among all:

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Emitter

Base

Collector

All are pure

A PN junction can not be sued a.

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Rectifier

Amplifier

Detector

LED

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

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Inductor

Rectifier

Comparator

emf

The device which is used as amplifier and works with the negative feedback is.

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Operational amplifier

P-n-p transistor

n-p-n transistor

Transistor

The output of two input is zero only when its.

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Both inputs are zero

Either input is zero

Both inputs are one

Either input is one

The reverse saturation current in a PN junction diode is only due to:

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Majority carriers

Minoritycarriers

Acceptor ions

Donor ions

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

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Rectifier

Transistor

Battery

Diode

Output resistance of an op amp is

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High

Low

Zero

Equal to input resistance

An expression for gain of an inverting amplifier is

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(R₁R₂)

None of these

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

Logic gate can control some physical parameters like.

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Temperature, Pressure

Resistance, Inductance

Capacitance, Impedance

Current, voltage

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 ratio Beta in transistor is called.

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Voltage gain

Emitter gain

Current gain

Nuclear gain

The p-n junction in which p side is connected to+ive and n-side is -ve the junction is said to be:

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Neutral

Forward biased

Reversed biased

None of above

The gain of transistor amplifier depends upon

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Resistance connected with collector

Resistance connected with base voltage

Input voltage

Output voltage

Base of transistor is of order:

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10^-11m

10⁶m

10^-8m

10^-6m

Reverse current flows due to

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Majority charge carriers

Minority charge carriers

Electrons

Holes

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Physics ICS Part 2 Chapter 18 Online MCQ's Test MCQs With Answers

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