Choose the correct statement about Zener diode:

It works as a voltage regulator in reverse bias and behaves like simple p-n junction diode in forward bias

It works as a voltage regulator in both forward and reverse bias

It works a voltage regulator only in forward bias

It works as a voltage regulator in forward bias and behaves like simple p-n junction diode in reverse bias

Match the List I with List II List I List II A Intrinsic Semiconductor I Fermi-level near valence band B n-type semiconductor II Fermi-level at middle of valence and conduction band C p-type semiconductor III Fermi-level near conduction band D Metals IV Fermi-level inside conduction band Choose the correct answer from the options given below:

(A) → II, (B) → III, (C) → I, (D) → IV

(A) → I, (B) → II, (C) → III, (D) → IV

(A) → II, (B) → I, (C) → III, (D) → IV

(A) → III, (B) → I, (C) → II, (D) → IV

Given below are two statements: Statement I : In a typical transistor, all three regions emitter, base and collector have same doping level. Statement II : in a transistor, collector is the thickest and base is the thinnest segment. In the light of the above statements, choose the most appropriate answer from the options given below.

Statement I is incorrect but Statement II is correct

Both Statement I and Statement II are correct

Both Statement I and Statement II are incorrect

Statement I is correct but Statement II is incorrect

Given below are two statements Statement I : For transmitting a signal, size of antenna ( l ) should be comparable to wavelength of signal (at least l = λ 4 in dimension). Statement II : In amplitude modulation, amplitude of carrier wave remains constant (unchanged). In the light of the above statements, choose the most appropriate answer from the options given below

Statement I is correct but Statement II is incorrect

Both Statement I and Statement II are correct

Both Statement I and Statement II are incorrect

Statement I is incorrect but Statement II is correct

MEDIUM

JEE Main

IMPORTANT

Earn 100

A $8 V$ Zener diode along with a series resistance $R$ is connected across a $20 V$ supply (as shown in the figure). If the maximum Zener current is $25 mA$ , then the minimum value of $R$ will be _____ $Ω$ .

100% studentsanswered this correctly

Important Questions on Electronic Devices Semiconductors

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 22 - Electronic Devices Semiconductors>JEE Main - 24 January 2023 Shift 1>Q 197

A modulating signal is a square wave, as shown in the figure.

Question Image

If the carrier wave is given as $c (t) = 2 \sin (8 π t)$ volts, the modulation index is:

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 22 - Electronic Devices Semiconductors>JEE Main - 24 January 2023 Shift 1>Q 198

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: Photodiodes are preferably operated in reverse bias condition for light intensity measurement.
Reason R: The current in the forward bias is more than the current in the reverse bias for a $p - n$ junction diode.

In the light of the above statement, choose the correct answer from the options given below :

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 22 - Electronic Devices Semiconductors>JEE Main - 24 January 2023 Shift 2>Q 199

Match List I with List II

	LIST I		LIST II
A	AM Broadcast	I	$88 - 108 MHz$
B	FM Broadcast	II	$540 - 1600 kHz$
C	Television	III	$3.7 - 4.2 GHz$
D	Satellite Communication	IV	$54 MHz - 590 MHz$

Choose the correct answer from the options given below:

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 22 - Electronic Devices Semiconductors>JEE Main - 25 January 2023 Shift 1>Q 201

A message signal of frequency

5 kHz

is used to modulate a carrier signal of frequency

2 MHz

. The bandwidth for amplitude modulation is:

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 22 - Electronic Devices Semiconductors>JEE Main - 25 January 2023 Shift 1>Q 202

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R

Assertion A: Photodiodes are used in forward bias usually for measuring the light intensity.

Reason R: For a $p - n$ junction diode, at applied voltage $V$ the current in the forward bias is more than the current in the reverse bias for $|V_{z}| > \pm V \geq |V_{0}|$ where $V_{0}$ is the threshold voltage and $V_{z}$ is the breakdown voltage.

In the light of the above statements, choose the correct answer from the options given below

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 22 - Electronic Devices Semiconductors>JEE Main - 25 January 2023 Shift 2>Q 203

Statement I : When a Si sample is doped with Boron, it becomes P type and when doped by Arsenic it becomes N-type semi conductor such that P-type has excess holes and N-type has excess electrons.

Statement II : When such P-type and N-type semi-conductors, are fused to make a junction, a current will automatically flow which can be detected with an externally connected ammeter.

In the light of above statements, choose the most appropriate answer from the options given below.

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 22 - Electronic Devices Semiconductors>JEE Main - 25 January 2023 Shift 2>Q 204

Match List I with List II

	List I		List II
A	Troposphere	I	Approximate $65 - 75 km$ over Earth’s surface
B	E-Part of Stratosphere	II	Approximate $300 km$ over Earth’s surface
C	$F_{2}$ -Part of Thermosphere	III	Approximate $10 km$ over Earth’s surface
D	D-Part of Stratosphere	IV	Approximate $100 km$ over Earth’s surface

Choose the correct answer from the options given below :

A 8V Zener diode along with a series resistance R is connected across a 20 V supply (as shown in the figure). If the maximum Zener current is 25 mA, then the minimum value of R will be _____ Ω.

Important Questions on Electronic Devices Semiconductors

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A $8 V$ Zener diode along with a series resistance $R$ is connected across a $20 V$ supply (as shown in the figure). If the maximum Zener current is $25 mA$ , then the minimum value of $R$ will be _____ $Ω$ .