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6. (JEE Main 2017 (Online) 8th April Morning Slot)

The V-I characteristic of a diode is shown in the figure. The ratio of forward to reverse bias resistance is :

JEE Main 2017 (Online) 8th April Morning Slot Physics - Semiconductor Question 142 English

A. 10

B. 10 − 6

C. 106

D. 100

The Correct Answer is Option (B)

Forward bias resistance

R1 = Δ V Δ I = 0.8 − 0.7 ( 20 − 10 ) × 10 − 3 = 10 Ω

Reverse bias resistance,

R2 = 10 1 × 10 − 6 = 107 Ω

∴ Ratio of resistance

= R 1 R 2 = 10 10 7 = 10 − 6

7. (JEE Main 2016 (Offline))

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 :

JEE Main 2016 (Offline) Physics - Semiconductor Question 151 English

A. O R

B. N A N D

C. N O T

D. A N D

The Correct Answer is Option (A)

In case of an ′ O R ′ gate the input is zero when all inputs are zero. If any one input is ′ 1 ′ , then the output is ′ 1 ′ .

8. (JEE Main 2014 (Offline))

The forward biased diode connection is:

A. JEE Main 2014 (Offline) Physics - Semiconductor Question 149 English Option 1

B. JEE Main 2014 (Offline) Physics - Semiconductor Question 149 English Option 2

C. JEE Main 2014 (Offline) Physics - Semiconductor Question 149 English Option 3

D. JEE Main 2014 (Offline) Physics - Semiconductor Question 149 English Option 4

The Correct Answer is Option (A)

JEE Main 2014 (Offline) Physics - Semiconductor Question 149 English Explanation

For forward bias, p -side must be at higher potential than n -side. Δ V = ( + ) V e

9. (AIEEE 2004)

When p - n junction diode is forward biased then

A. both the depletion region and barrier height are reduced

B. the depletion region is widened and barrier height is reduced

C. the depletion region is reduced and barrier height is increased

D. both the depletion region and barrier height are increased

The Correct Answer is Option (A)

Both the depletion region and barrier height is reduced.

10. (AIEEE 2003)

In the middle of the depletion layer of a reverse- biased p - n junction, the

A. electric field is zero

B. potential is maximum

C. electric field is maximum

D. potential is zero

The Correct Answer is Option (A)

As in reverse bias, the current through the 0000 is zero through the electric field is also zero.