NEET 2025 Level Semiconductor Electronics Physics NEET Practice Questions, MCQs, Past Year Questions (PYQs), NCERT Questions, Question Bank, Class 11 and Class 12 Questions, and PDF solved with answers

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NEET Questions
Physics
Semiconductor Electronics
NEET 2025 Level (25 Qs)

Select Chapter Topics:

Energy Band theory

Types of Semiconductors

PN junction

Applications of PN junction

Rectifier

Logic gates

1(current)
2
3

Q. No.

Assuming that the diode is ideal, the output waveform for the circuit (shown in the figure) is:

1.		2.
3.		4.

Q1:

From NCERT

Subtopic: Rectifier |

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For a diode connected in parallel with a resistor, Choose the correct graph between \((I)\) and \((V)\) for the given circuit:

1.		2.
3.		4.

Q2:

From NCERT

Subtopic: PN junction |

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The breakdown in a reverse-biased p-n junction diode is more likely to occur due to:

1.	Large velocity of the minority charge carriers if the doping concentration is small.
2.	Large velocity of the minority charge carriers if the doping concentration is large.
3.	A strong electric field in a depletion region if the doping concentration is small.
4.	Weak electric field in a depletion region if the doping concentration is small.

Q3:

From NCERT

Subtopic: PN junction |

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The peak voltage in the output of a half-wave rectifier is \(30 ~\text{V}.\) The RMS voltage of the output wave is: (assuming no distortion in wave)

1.	\(\dfrac{30}{\sqrt2}~\text{V}\)	2.	\(15 ~\text{V}\)
3.	\(\dfrac{15}{\sqrt2}~\text{V}\)	4.	\(10 ~\text{V}\)

Q4:

From NCERT

Subtopic: Rectifier |

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The circuit shown in figure is given an input signal \(V_i,\) which varies with time and the corresponding output is \(V_o.\) Then,

1.	\(V_o=V_i+E\)
2.	\(V_o=V_i-E\)
3.	\(V_o=V_i,\) only when \(V_i>E\)
4.	\(V_o=V_i,\) only when \(V_i<E\)

Q5:

From NCERT

Subtopic: PN junction |

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Which circuit element would make the best series filter to prevent high–frequency signals from passing through a bass speaker?
1. a capacitor
2. an inductor
3. a resistor
4. a transformer

Q6:

From NCERT

Subtopic: Rectifier |

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If an AND-gate and an OR-gate are OR-ed together, the resulting gate is:
1. AND
2. OR
3. XOR
4. none of the above

Q7:

From NCERT

Subtopic: Logic gates |

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Zener diodes with breakdown voltage ranging over \((2~\text{V}\text-200~\text{V})\) are commercially available. The breakdown voltage of a Zener diode:

1.	increases with increasing doping concentration.
2.	decreases with increasing doping concentration.
3.	does not depend on doping concentration.
4.	may increase or decrease with increasing doping concentration.

Q8:

From NCERT

Subtopic: Applications of PN junction |

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The input to a Zener diode circuit is an AC-voltage along with a DC: \(V_i=(20~\text V)\sin\omega t+(20~\text V)~\)
Current flows through the diode:

1.	continuously, in both directions
2.	continuously, only in one direction
3.	intermittently, in both directions
4.	intermittently, only in one direction

Q9:

From NCERT

Subtopic: Applications of PN junction |

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The voltage \(V_{AB}=20~\text{V}\) at its peak value, and is sinusoidal in time. The current \(i\) (in amperes), when plotted as a function of time, is given by:
(consider the diodes as ideal.)