The LED:

1. is reverse-biased.
2. is forward-biased.
3. can be made of \(\mathrm{GaAs}.\)
4. both (2) and (3) are correct.
Subtopic:  Applications of PN junction |
 71%
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Zener diode is not used for:
1. oscillatory circuit
2. current amplification
3. voltage amplification
4. all of the above
Subtopic:  Applications of PN junction |
 70%
From NCERT
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For a Zener diode used as a voltage regulator, the connections are as follows:
(I) In forward bias
(II) In reverse bias
(III) In parallel with the load
(IV) In series with the load

Choose the correct option from the options given below:
1. (I) and (II) only
2. (II) and (III) only
3. only (I)
4. only (IV)
Subtopic:  Applications of PN junction |
 88%
From NCERT
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Given below are two statements:
Assertion (A): The resistance of a photodiode decreases when light having photons of sufficient energy is incident on it.
Reason (R): When energetic photons fall on the \(\mathrm{p\text{-}n}\) junction of a photodiode, electron-hole pairs are created due to the breaking of the valence bonds.
 
1. (A) is True but (R) is False.
2. (A) is False but (R) is True.
3. Both (A) and (R) are True and (R) is the correct explanation of (A).
4. Both (A) and (R) are True but (R) is not the correct explanation of (A).
Subtopic:  Applications of PN junction |
 71%
From NCERT
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