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

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.

Statement I is correct but statement II is incorrect

Both Statement I and statement II are incorrect

Statement I is incorrect but statement II is correct

Both Statement I and statement II are correct

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 > ± V ≥ 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

Both A and R are true and R is correct explanation A

Both A and R are true but R is NOT the correct explanation A

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JEE Main

IMPORTANT

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A realistic graph depicting the variation of the reciprocal of input resistance in an input characteristics measurement in a common emitter transistor configuration is :

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Important Questions on Electronic Devices Semiconductors

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JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 22 - Electronic Devices Semiconductors>JEE Main - 10th April 2015>Q 135

In an unbiased p - n junction electrons diffuse from n-region to p-region because:

HARD

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 22 - Electronic Devices Semiconductors>JEE Main - 4th April 2015>Q 136

A signal of $5 kHz$ frequency is amplitude modulated on a carrier wave of frequency $2 MHz$ . The frequencies of the resultant signal is/are:

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IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 22 - Electronic Devices Semiconductors>JEE Main - 11th April 2015>Q 137

The value of the resistor, $R_{S}$ , needed in the DC voltage regulator circuit shown here, equals:

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IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 22 - Electronic Devices Semiconductors>JEE Main - 11th April 2015>Q 138

2 V

battery is connected across

A B

as shown in the figure. The value of the current supplied by the battery when in first case battery's positive terminal is connected to

A

and in second case when positive terminal of battery is connected to

B

will respectively be:
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JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 22 - Electronic Devices Semiconductors>JEE Main - 19th April 2014>Q 139

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Given, $A$ and $B$ are input terminals

Logic $1$ is $> 5 V$

Logic $0$ is $< 1 V$

Which logic gate operation, the following circuit does?

Note: This question was awarded a bonus. $C$ option changed.

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JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 22 - Electronic Devices Semiconductors>JEE Main - 19th April 2014>Q 140

Long-range radio transmission is possible when the radio waves are reflected from the ionosphere. For this to happen the frequency of the radio waves must be in the range:

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JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 22 - Electronic Devices Semiconductors>JEE Main - 9th April 2014>Q 141

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 :

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JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 22 - Electronic Devices Semiconductors>JEE Main - 9th April 2014>Q 142

A transmitting antenna at the top of a tower has a height $32 m$ and the height of the receiving antenna is $50 m$ . What is the maximum distance between them for satisfactory communication in line of sight (LOS) mode?

A realistic graph depicting the variation of the reciprocal of input resistance in an input characteristics measurement in a common emitter transistor configuration is :

Important Questions on Electronic Devices Semiconductors

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