is more reliable than analog signal

is less reliable than analog signal

is equally reliable as the analog signal

Identify a false statement from the following

Diodes can be used for rectifying a DC voltage input to obtain AC voltage.

The number of electrons is equal to the number of holes in intrinsic semiconductors.

By changing the external applied voltage p - n junction barrier can be changed.

n - type semiconducting Si or Ge obtained by doping with pentavalent atoms.

In n - type silicon, which of the following statements is true?

Holes are monority carriers and pentavalent atoms are the dopants.

Electrons are majority carriers and trivalent atoms are the dopants.

Electrons are minority carriers and pentavalent atoms are the dopants.

Holes are majority carriers and trivalent atoms are the dopants.

The scientific principle involved in 'Laser' is____

Amplification by population inversion

Motion of a charged particle in an electromagnetic field

E M B I B E

Physics Crash Course NEET>Chapter 21 - Electronic Devices>Level 2>Q 7

EASY

NEET

IMPORTANT

Earn 100

Symbolic representation of a photodiode is

100% studentsanswered this correctly

Important Questions on Electronic Devices

EASY

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 21 - Electronic Devices>Level 2>Q 8

Which of the following does not give

p -

type properties to a semiconductor when used as a doping agent?

MEDIUM

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 21 - Electronic Devices>Level 2>Q 12

An n-p-n transistor has three leads A, B and C. Connecting B and C by moist fingers, A to the positive lead of an ammeter, and C to the negative lead of the ammeter, one finds large deflection. Then, A, B and C refer respectively to :

EASY

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 21 - Electronic Devices>Level 2>Q 13

Consider an amplifier circuit wherein a transistor is used in common emitter mode. The change in collector current and base current respectively are

4 mA

and

20 μ

A when a signal of

40 mV

is added to the base-emitter voltage. If the load resistance is

10 kΩ

, then power gain in the circuit is

EASY

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 21 - Electronic Devices>Level 2>Q 14

In the study of transistor as an amplifier, the ratio of collector current to emitter current is

0.98

then the ratio of collector current to base current will be

MEDIUM

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 21 - Electronic Devices>Level 2>Q 16

The arrangement of $NAND$ gates shown below effectively works as

MEDIUM

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 21 - Electronic Devices>Level 2>Q 17

A digital signal -

EASY

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 21 - Electronic Devices>Level 2>Q 18

If

a, b, c, d

are inputs to a gate and

x

is its output, then, as per the following time graph, the gate is:

EASY

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 21 - Electronic Devices>Level 2>Q 20

The truth table of a logic gate is given below

input		Output
$A$	$B$	$Y$
$0$	$0$	$1$
$0$	$1$	$1$
$1$	$0$	$1$
$1$	$1$	$0$

The logic gate is

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