NCERT Solutions | Class 12 Physics Chapter 6

NCERT Solutions | Class 12 Physics Chapter 6 | Semiconductor Electronics: Materials, Devices And Simple Circuits 

NCERT Solutions for Class 12 Physics Chapter 6 Semiconductor Electronics: Materials, Devices And Simple Circuits

CBSE Solutions | Physics Class 12

Check the below NCERT Solutions for Class 12 Physics Part-II Chapter 6 Semiconductor Electronics: Materials, Devices And Simple Circuits Pdf free download. NCERT Solutions Class 12 Physics  were prepared based on the latest exam pattern. We have Provided Semiconductor Electronics: Materials, Devices And Simple Circuits Class 12 Physics NCERT Solutions to help students understand the concept very well.

NCERT | Class 12 Physics Part-II

NCERT Solutions Class 12 Physics Part-II
Book: National Council of Educational Research and Training (NCERT)
Board: Central Board of Secondary Education (CBSE)
Class: 12th
Subject: Physics Part-II
Chapter: 6
Chapters Name: Semiconductor Electronics: Materials, Devices And Simple Circuits
Medium: English

Semiconductor Electronics: Materials, Devices And Simple Circuits | Class 12 Physics | NCERT Books Solutions

You can refer to MCQ Questions for Class 12 Physics Chapter 6 Semiconductor Electronics: Materials, Devices And Simple Circuits to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

ncert physics class 12 chapters Question 1.

In an n-type silicon, which of the following statement is true :

(a) Electrons are majority carriers and trivalent atoms are the dopants.
(b) Electrons are minority carriers and pentavalent atoms are the dopants.
(c) Holes are minority carriers and pentavalent atoms are the doplants.
(d) Holes are majority carriers and trivalent atoms are the dopants.

Ncert Solutions for Class 12 Physics Chapter 14 Answer:

(c) ‘Holes are minority carriers and pentavalent atoms are the dopants in n type semiconductor.’

physics class 12 ncert book Question 2.

Which of the statements given in Exercise 1 is true for p-type semiconductors ?

Ncert Solutions for Class 12 Physics Chapter 14 Answer:

(d) Holes are majority carriers and trivalent atoms are the dopants in p-type semiconductors.

physics class 12 syllabus Question 3.

Carbon, silicon and germanium have four valence electrons each. These are characterised by valence and conduction bands separated by energy band gap respectively equal to (Eg)c, (Eg)si and (Eg)Ge-
Which of the following statements is true ?
(a) (Eg)Si < (Eg)Ge < (Eg)c
(b)(E)c<(Eg)Ge>(Eg)si
(c) (Eg)c > (Eg)si > (Eg)Ge
(d) (Eg)c = (Eg)si = (Eg)Ge

Ncert Solutions for Class 12 Physics Chapter 14 Answer:

(C) (Eg)c > (Eg)Si > (Eg)Ge. Energy band gap is maximum in carbon and least in germanium among the given elements.

ncert physics class 12 Question 4.

In an unbiased p-n junction, holes diffuse from the p-region to n-region because
(a) free electrons in the n-region attract them.
(b) they move across the junction by the potential difference.
(c) hole concentration in p-region is more as compared to n-region.
(d) All the above.

Ncert Solutions for Class 12 Physics Chapter 14 Answer:

(c) hole concentration in p-region is more as compared to n-region because hole diffusion takes place from higher concentration to lower concentration.

ncert physics class 12 solutions pdf Question 5.

When a forward bias is applied to a p-n junction, it
(a) raises the potential barrier
(b) reduces the majority carrier current to zero
(c) lowers the potential barrier
(d) none of the above.

Ncert Solutions for Class 12 Physics Chapter 14 Answer:

(c) lowers the potential barrier by cancelling the depletion layer.

physics class 12 syllabus Question 6.

For transistor action, which of the following statements are correct :

(a) Base, emitter and collector regions should have similar size and doping concentrations.
(b) The base region must be very thin and lightly doped.
(c) The emitter junction is forward biased and collector junction is reverse biased.
(d) Both the emitter junction as well as the collector junction are forward biased.

Ncert Solutions for Class 12 Physics Chapter 14 Answer:

(b) and (c) : The base region must be very thin, lightly doped and the emitter junction is forward biased whereas collector junction is reverse biased to avoid unnecessary diffusion of charge carrier in the base and also for proper amplification.

ncert solutions for class 12 physics Chapter 14 pdf download Question 7.

For a transistor amplifier, the voltage gain :

(a) remains constant for all frequencies.
(b) is high at high and low frequencies and constant in the middle frequency range.
(c) is low at high and low frequencies and constant at mid frequencies.
(d) None of the above.

Ncert Solutions for Class 12 Physics Chapter 14 Answer:

(c) is low at high and low frequencies and constant at mid frequencies as per frequency response of a transistor.

class 12 physics practical Question 8.

In half-wave rectification, what is the output frequency if the input frequency is 50 Hz. What is the output frequency of a full-wave rectifier for the same input frequency.

Ncert Solutions for Class 12 Physics Chapter 14 Answer:

A half wave rectifier rectifies only one half cycle of input A.C.
.’. frequency of the output A.C.
= frequency of input A.C. = 50 Hz A full wave rectifier rectifies both halve cycles
of the A.C. input
.’. frequency of output A.C. = 2 x frequency of input A.C. = 2 x 50 = 100 Hz

ncert physics class 12 solutions Question 9.

For a CE-transistor amplifier, the audio signal voltage across the collector resistance of 2 kQ is 2 V. Suppose the current amplification factor of the transistor is 100, find the input signal voltage and base current, if the base resistance is 1 kΩ.

Ncert Solutions for Class 12 Physics Chapter 14 Answer:

NCERT Solutions for Class 12 Physics Chapter 14 Electronics Devices 1

physics class 12 ncert book Question 10.

Two amplifiers are connected one after the other in series (cascaded). The first amplifier has a voltage gain of 10 and the second has a voltage gain of 20. If the input signal is 0.01 volt, calculate the output ac signal.

Ncert Solutions for Class 12 Physics Chapter 14 Answer:

NCERT Solutions for Class 12 Physics Chapter 14 Electronics Devices 2

ncert solutions for class 12 physics Chapter 14 Question 11.

A p-n photodiode is fabricated from a semiconductor with bandgap of 2.8 eV. Can it detect a wavelength of 6000 nm ?

Ncert Solutions for Class 12 Physics Chapter 14 Answer:

NCERT Solutions for Class 12 Physics Chapter 14 Electronics Devices 3
Since the energy of the light photon is less than the bandgap energy of the p-n diode, it can not be detected.

class 12 physics notes Question 12.

The number of silicon atoms per m3 is 5 x 1028. This is doped simultaneously with 5 x 1022 atoms per m3 of Arsenic and 5 x 1020 per m3 atoms of Indium. Calculate the number of electrons and holes. Given that ni = 1.5 x 1016 m-3. Is the material n-type or p- type ?

Ncert Solutions for Class 12 Physics Chapter 14 Answer:

NCERT Solutions for Class 12 Physics Chapter 14 Electronics Devices 4

ncert physics class 12 pdf Question 13.

In an intrinsic semiconductor, the energy gap Eg is 1.2 eV. Its hole mobility is much smaller than electron mobility and independent of temperature. What are the ratio between conductivity at 600 K and that at 300 K? Assume that the temperature dependence of intrinsic carrier concentration ni is given by
NCERT Solutions for Class 12 Physics Chapter 14 Electronics Devices 5

Ncert Solutions for Class 12 Physics Chapter 14 Answer:

NCERT Solutions for Class 12 Physics Chapter 14 Electronics Devices 6

Thus, conductivity of a semiconductor increases with rise in temperature.

physics class 12 practical Question 14.

In a P-n junction diode, the current I can be expressed as
NCERT Solutions for Class 12 Physics Chapter 14 Electronics Devices 7
where I0 is reverse saturation current. V is the voltage across the diode and is positive for forwarding bias and negative for reverse bias, and I is the current through the diode, KB is the Boltzmann constant (8.6 x 10-5 eV/K) and T is the absolute temperature. If for a given diode I0 = 5 x 10-12 A and T = 300 K, then
(a) What will be the forward current at a forwarding voltage of 0.6 V?
(b) What will be the increase in the current if the voltage across the diode is increased to 0.7 V?
(c) What is the dynamic resistance?
(d) What will be the current if reverse bias voltage changes from 1 V to 2 V?

Ncert Solutions for Class 12 Physics Chapter 14 Answer:

The statement of the given question is incorrect. The relation should be

ncert solutions for class 12 physics Chapter 14 pdf download Question 15.

You are given the two circuits as shown in Figure. Show that circuit (a) acts as OR gate while circuit (b) acts as AND gate.
NCERT Solutions for Class 12 Physics Chapter 14 Electronics Devices 8

Ncert Solutions for Class 12 Physics Chapter 14 Answer:

NCERT Solutions for Class 12 Physics Chapter 14 Electronics Devices 9

class 12 physics practical Question 16.

Write the truth table for a NAND gate connected as given in Fig. Hence identify the exact logic operation carried out by these circuits.
NCERT Solutions for Class 12 Physics Chapter 14 Electronics Devices 10

Ncert Solutions for Class 12 Physics Chapter 14 Answer:

The NAND gate shown in the truth table has only one input. Therefore, the truth table is

A A y = \( \bar { A.A }\)
0 0 1
1 1 0

Since Y = \( \bar { A }\) in this case, the circuit is actually a NOT gate with the truth table

A Y
0 1
1 0

ncert physics class 12 solutions pdf Question 17.

You are given two circuits as shown in Fig., which consist of NAND gates. Identify the logic operation carried out by the two circuits.
NCERT Solutions for Class 12 Physics Chapter 14 Electronics Devices 11

Ncert Solutions for Class 12 Physics Chapter 14 Answer:

NCERT Solutions for Class 12 Physics Chapter 14 Electronics Devices 12

ncert solutions class 12 physics Semiconductor Electronics Materials Devices And Simple Circuits Question 18.

Write the truth table for circuit given in Fig. below consisting of NOR gates and identify the logic operation (OR, AND, NOT) which this circuit is performing.
NCERT Solutions for Class 12 Physics Chapter 14 Electronics Devices 13

Ncert Solutions for Class 12 Physics Chapter 14 Answer:

Let y1 be the output which appears at the first operation of NOR gate.
NCERT Solutions for Class 12 Physics Chapter 14 Electronics Devices 14

A B Y
0 0 0
1 0 1
0 1 1
1 1 1

class 12 physics syllabus Question 19.

Write the truth table for the circuits given in Fig., consisting of NOR gates only. Identify the logic operations (OR, AND, NOT) performed by the two circuits
NCERT Solutions for Class 12 Physics Chapter 14 Electronics Devices 15

Ncert Solutions for Class 12 Physics Chapter 14 Answer:

NCERT Solutions for Class 12 Physics Chapter 14 Electronics Devices 16

NCERT Physics Class 12

Class 12 Physics Chapters | Physics Class 12 Chapter 6

NCERT Solutions For Class 12 physics

NCERT Solutions | Class 12 Physics Part-I

    NCERT Solutions For Class 12 Physics Part-I Chapter 1 Electric Charges And Fields
    NCERT Solutions For Class 12 Physics Part-I Chapter 2 Electrostatic Potential And Capacitance
    NCERT Solutions For Class 12 Physics Part-I Chapter 3 Current Electricity
    NCERT Solutions For Class 12 Physics Part-I Chapter 4 Moving Charges And Magnetism
    NCERT Solutions For Class 12 Physics Part-I Chapter 5 Magnetism And Matter
    NCERT Solutions For Class 12 Physics Part-I Chapter 6 Electromagnetic Induction
    NCERT Solutions For Class 12 Physics Part-I Chapter 7 Alternating Current
    NCERT Solutions For Class 12 Physics Part-I Chapter 8 Electromagnetic Waves

NCERT Solutions | Class 12 Physics Part-II

    NCERT Solutions For Class 12 Physics Part-II Chapter 1 Ray Optics And Optical Instruments
    NCERT Solutions For Class 12 Physics Part-II Chapter 2 Wave Optics
    NCERT Solutions For Class 12 Physics Part-II Chapter 3 Dual Nature Of Radiation And Matter
    NCERT Solutions For Class 12 Physics Part-II Chapter 4 Atoms
    NCERT Solutions For Class 12 Physics Part-II Chapter 5 Nuclei
    NCERT Solutions For Class 12 Physics Part-II Chapter 6 Semiconductor Electronics: Materials, Devices And Simple Circuits
    NCERT Solutions For Class 12 Physics Part-II Chapter 7 Communication Systems
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