Semiconductor Electronics
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For a transistor to act as a switch, it must be operated in
For a transistor to act as a switch, it must be operated in
For Transistor
to act as a switch → Saturation & cut – off state
to act as an amplifier → Active Region
Upvote 
The breakdown in a reverse biased p-n junction is more likely to occur due to
(a) Large velocity of the minority charge carriers if the doping concentration is small
(b) Large velocity of the minority charge carriers if the doping concentration is large
(c) Strongelectricfieldinadepletionregionifthedopingconcentrationissmall
(d) Strong electric field in the depletion region if the doping concentration is large
The breakdown in a reverse biased p-n junction is more likely to occur due to
(a) Large velocity of the minority charge carriers if the doping concentration is small
(b) Large velocity of the minority charge carriers if the doping concentration is large
(c) Strongelectricfieldinadepletionregionifthedopingconcentrationissmall
(d) Strong electric field in the depletion region if the doping concentration is large
This is a Multiple Choice Questions as classified in NCERT Exemplar
Answer- (a, d)
Explanation- In reverse biasing, the minority charge carriers will be accelerated due to reverse biasing, which on striking with atoms cause ionization resulting secondary electrons and thus more number of charge carrie
Upvote To reduce the ripples in rectifier circuit with capacitor filter
(a) RLshould be increased
(b) Input frequency should be decreased .
(c) Input frequency should be increased
(d) Capacitors with high capacitance should be used
To reduce the ripples in rectifier circuit with capacitor filter
(a) RLshould be increased
(b) Input frequency should be decreased .
(c) Input frequency should be increased
(d) Capacitors with high capacitance should be used
This is a Multiple Choice Questions as classified in NCERT Exemplar
Answer- a, c, d
Explanation-ripple factor is inversely proportional to RL, C and frequency. so to reduce ripple factor all these should be increase.
Upvote What happens during regulation action of a Zener diode?
(a) The current and voltage across the Zener remains fixed
(b) The current through the series Resistance (Rs) changes
(c) The Zener resistance is constant
(d) The resistance offered by the Zener changes
What happens during regulation action of a Zener diode?
(a) The current and voltage across the Zener remains fixed
(b) The current through the series Resistance (Rs) changes
(c) The Zener resistance is constant
(d) The resistance offered by the Zener changes
This is a Multiple Choice Questions as classified in NCERT Exemplar
Answer-b, d
Explanation- During regulation action of a Zener diode, the current through the Rs changes and resistance offered by the Zener changes. The current through the Zener changes but the voltage across the Zener remains constan
Upvote In the depletion region of a diode
(a) There are no mobile charges
(b) Equal number of holes and elections exist, making the region neutral
(c) Recombination of holes and electrons has taken place
(d) Immobile charged ions exist
In the depletion region of a diode
(a) There are no mobile charges
(b) Equal number of holes and elections exist, making the region neutral
(c) Recombination of holes and electrons has taken place
(d) Immobile charged ions exist
This is a Multiple Choice Questions as classified in NCERT Exemplar
Answer- a, b, d
Explanation- The space-charge regions on both the sides of p-n junction which has immobile ions and entirely lacking of any charge carriers will form a region called depletion region of a diode.
The number of ionized ac
Upvote In a n-p-n transistor circuit, the collector current is 10 mA. If 95 per cent of the electrons emitted reach the collector, which of the following statements are true?
(a) The emitter current will be 8 mA
(b) The emitter current will be 10.53 mA
(c) The base current will be 0.53 mA
(d) The base current will be 2 mA
In a n-p-n transistor circuit, the collector current is 10 mA. If 95 per cent of the electrons emitted reach the collector, which of the following statements are true?
(a) The emitter current will be 8 mA
(b) The emitter current will be 10.53 mA
(c) The base current will be 0.53 mA
(d) The base current will be 2 mA
This is a Multiple Choice Questions as classified in NCERT Exemplar
Answer- b, c
Explanation- IC= 10mA
Ic= 95/100 Ie
Ie= = 10.53mA
Ib=Ie-IC= 10.53-10= .53mA
Upvote Consider an n-p-n transistor with its base-emitter junction forward biased and collector base junction reverse biased. Which of the following statements are true?
(a) Electrons crossover from emitter to collector
(b) Holes move from base to collector
(c) Electrons move from emitter to base
(d) Electrons from emitter move out of base without going to the collector
Consider an n-p-n transistor with its base-emitter junction forward biased and collector base junction reverse biased. Which of the following statements are true?
(a) Electrons crossover from emitter to collector
(b) Holes move from base to collector
(c) Electrons move from emitter to base
(d) Electrons from emitter move out of base without going to the collector
This is a Multiple Choice Questions as classified in NCERT Exemplar
Answer- a, c
Explanation- Here emitter-base junction is forward biased i.e., the positive pole of emitter base battery is connected to base and its negative pole to emitter. Also, the collector base junction is reverse biased, i
Upvote When an electric field is applied across a semiconductor
(a) Electrons move from lower energy level to higher energy level in the conduction band
(b) Electrons move from higher energy level to lower energy level in the conduction band
(c) Holes in the valence band move from higher energy level to lower energy level
(d) Holes in the valence band move from lower energy level to higher energy level
When an electric field is applied across a semiconductor
(a) Electrons move from lower energy level to higher energy level in the conduction band
(b) Electrons move from higher energy level to lower energy level in the conduction band
(c) Holes in the valence band move from higher energy level to lower energy level
(d) Holes in the valence band move from lower energy level to higher energy level
This is a Multiple Choice Questions as classified in NCERT Exemplar
Answer- (a, c)
Explanation- when we apply temperature across semiconductor then electron will starts from lower energy to high energy level that is from valence band to conduction band. When electron goes from lower to higher then hol
Upvote 
This is a Multiple Choice Questions as classified in NCERT Exemplar
Answer- c
Explanation- C=A.B and D=A'B
E= C+D = (A.B)+ (A'.B)
A | B | A' | C=A.B | D=A'B | E=C+D |
0 | 0 | 1 | 0 | 0 | 0 |
0 | 1 | 1 | 0 | 1 | 1 |
1 | 0 | 0 | 0 | 0 | 0 |
1 | 1 | 0 | 1 | 0 | 1 |
Upvote In the circuit shown in figure given below, if the diode forward voltage between A and B is
In the circuit shown in figure given below, if the diode forward voltage between A and B is
This is a Multiple Choice Questions as classified in NCERT Exemplar
Answer-b
Explanation- r1=5kohm and r2= 5kohm and both are in series
Then V-0.3 = [ (r1+r2)103] [0.2 10-3]
V-0.3= 2
V= 2.3V
Upvote