NCERT Solutions | Class 12 Physics Chapter 7

NCERT Solutions | Class 12 Physics Chapter 7 | Communication Systems 

CBSE Solutions | Physics Class 12

Check the below NCERT Solutions for Class 12 Physics Part-II Chapter 7 Communication Systems Pdf free download. NCERT Solutions Class 12 Physics  were prepared based on the latest exam pattern. We have Provided Communication Systems 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:	7
Chapters Name:	Communication Systems
Medium:	English

Communication Systems | Class 12 Physics | NCERT Books Solutions

You can refer to MCQ Questions for Class 12 Physics Chapter 7 Communication Systems to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

ncert physics class 12 pdf Question 1.

At which of the following frequency/frequencies the communication will not be reliable for a receiver situated beyond the horizon:
(a) 10 kHz
(b) 10 MHz
(c) 1 GHz
(d) 1000 GHz

Ncert Solutions for Class 12 Physics Chapter 15 Answer:

(b) is correct. Here (c) and (d) frequencies have high penetration power so the earth will absorb them. Radiation (a) of 10 kHz will suffer from the problem of the size of the antenna.

physics class 12 practical Question 2.

Frequencies in the UHF range normally propagate by means of
(a) ground waves
(b) sky waves
(c) surface waves
(d) space waves.

Ncert Solutions for Class 12 Physics Chapter 15 Answer:

(d) space waves.

ncert solutions class 12 physics Chapter 15 Question 3.

Digital signals (i) do not provide a continuous set of values, (ii) represent values as discrete steps, (Hi) can utilize the only binary system, and (iv) can utilize decimal as well as a binary system. Which of the following options is true :
(a) Only (i) and (ii).
(b) Only (ii) and (iii).
(c) Only (i), (ii) and (iii), but not (iv).
(d) AH the above (i) to (iv).

Ncert Solutions for Class 12 Physics Chapter 15 Answer:

(c) is correct because the decimal system is concerned with continuous values (i) to (iii).

ncert physics class 12 chapters Question 4.

Is it necessary for a transmitting antenna to be at the same height as that of the receiving antenna for line-of-sight communication? A TV transmitting antenna is 81 m tall. How much service area can it cover if the receiving antenna is at the ground level?

Ncert Solutions for Class 12 Physics Chapter 15 Answer:

For line-of-sight communication, it is necessary that the transmitting antenna and receiving antenna should be eye to eye but it is not necessary that they should be at the same height.

physics class 12 chapters Question 5.

A carrier wave of peak voltage 12 V is used to transmit a message signal. What should be the peak voltage of the modulating signal in order to have a modulation index of 75%?

Ncert Solutions for Class 12 Physics Chapter 15 Answer:

ncert solutions class 12 physics Chapter 15 Question 6.

A modulation signal is a square wave as shown in the figure. The carrier wave is given by
C(t) = 2 sin(8πt) V

(a) Sketch the amplitude modulated waveform.
(b) What is the modulation index?

Ncert Solutions for Class 12 Physics Chapter 15 Answer:

Accordingly, the amplitude modulated waveform is shown ahead:

cbse solutions class 12 physics Question 7.

For an amplitude modulated wave, the maximum amplitude is found to be 10 V while the minimum amplitude is found to be 2 V. Determine the modulation index μ. What would be the value of μ if the minimum amplitude is zero V?

Ncert Solutions for Class 12 Physics Chapter 15 Answer:

Question 8.
Show that if a device is available which can multiply two signals, then it is possible to recover the modulating signal at the receiver station.

Ncert Solutions for Class 12 Physics Chapter 15 Answer:

Let there be two signals represented by
A_c cos ω_ct and A₀ cos(ω_c + ω_m)t where A_c is the
amplitude, ω_c is the angular frequency of a carrier wave at the receiving end and A₀ is the amplitude, (ω_c+ ω_m) is the angular velocity of the modulated wave.
Multiplying these signals, we get

NCERT Physics Class 12

Class 12 Physics Chapters | Physics Class 12 Chapter 7

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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