{"id":19091,"date":"2022-06-03T23:30:14","date_gmt":"2022-06-03T18:00:14","guid":{"rendered":"https:\/\/mcq-questions.com\/?p=19091"},"modified":"2022-05-21T12:50:49","modified_gmt":"2022-05-21T07:20:49","slug":"mcq-questions-for-class-12-physics-chapter-15","status":"publish","type":"post","link":"https:\/\/mcq-questions.com\/mcq-questions-for-class-12-physics-chapter-15\/","title":{"rendered":"MCQ Questions for Class 12 Physics Chapter 15 Communication Systems with Answers"},"content":{"rendered":"

Students are advised to practice the NCERT MCQ Questions for Class 12 Physics Chapter 15 Communication Systems with Answers Pdf free download is available here. MCQ Questions for Class 12 Physics with Answers<\/a> are prepared as per the Latest Exam Pattern. Students can solve these Communication Systems Class 12 MCQs Questions with Answers and assess their preparation level.<\/p>\n

Communication Systems Class 12 MCQs Questions with Answers<\/h2>\n

Solving the Communication Systems Multiple Choice Questions of Class 12 Physics Chapter 15 MCQ can be of extreme help as you will be aware of all the concepts. These MCQ Questions on Communication Systems Class 12 with answers pave for a quick revision of the Chapter thereby helping you to enhance subject knowledge. Have a glance at the MCQ of Chapter 15 Physics Class 12 and cross-check your answers during preparation.<\/p>\n

Question 1.
\nA carrier frequency of 1 MHz and peak value of 10 V is amplitude modulated with a signal frequency of 10 kHz with peak value of 0.5 V. Then the modulation index and the side band frequencies respectively are
\n(a) 0.05 and 1 \u00b1 0.010 MHz
\n(b) 0.5 and 1 \u00b1 0.010 MHz
\n(c) 0.05 and 1 \u00b1 0.005 MHz
\n(d) 0.5 and 1 \u00b1 0.005 MHz
\n(e) 0.05 and 1 \u00b1 0.100 MHz<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) 0.05 and 1 \u00b1 0.010 MHz<\/p>\n<\/details>\n

\n

Question 2.
\nThe maximum line – of – sight distance dM between two antennas having heights hT and hR above the earth is
\n(a) \\(\\sqrt{R(h_T+h_R)}\\)
\n(b) \\(\\sqrt{2R\/(h_T+h_R)}\\)
\n(c) \\(\\sqrt{Rh_T}\\) + \\(\\sqrt{2Rh_R}\\)
\n(d) \\(\\sqrt{2Rh_T}\\) + \\(\\sqrt{2Rh_R}\\)
\n(e) \\(\\sqrt{2Rh_T}\\) + \\(\\sqrt{Rh_R}\\)<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (d) \\(\\sqrt{2Rh_T}\\) + \\(\\sqrt{2Rh_R}\\)<\/p>\n<\/details>\n

\n

Question 3.
\nThe frequency band used in the downlink of satellite communication is
\n(a) 9.5 to 2.5 GHz
\n(b) 896 to 901 MHz
\n(c) 3.7 to 4.2 GHz
\n(d) 840 to 935 MHz
\n(e) 3.7 to 4.2 MHz<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (c) 3.7 to 4.2 GHz<\/p>\n<\/details>\n

\n

Question 4.
\nIn amplitude modulation, the bandwidth is
\n(a) twice the audio signal frequency
\n(b) thrice the audio signal frequency
\n(c) thrice the carrier wave frequency
\n(d) twice the carrier wave frequency
\n(e) sum of audio signal frequency and carrier wave frequency<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) twice the audio signal frequency<\/p>\n<\/details>\n

\n

Question 5.
\nIf both the length of an antenna and the wavelength of the signal to be transmitted are doubled, the power radiated by the antenna
\n(a) is doubled
\n(b) is halved
\n(c) remains constant
\n(d) is quadrupled
\n(e) increases 16 times<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (c) remains constant<\/p>\n<\/details>\n

\n

Question 6.
\nIf the maximum amplitude of an amplitude modulated wave is 25 V and the minimum amplitude is 5 V, the modulation index is
\n(a) \\(\\frac { 1 }{5}\\)
\n(b) \\(\\frac { 1 }{3}\\)
\n(c) \\(\\frac { 3 }{2}\\)
\n(d) \\(\\frac { 2 }{5}\\)
\n(e) \\(\\frac { 2 }{3}\\)<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (e) \\(\\frac { 2 }{3}\\)<\/p>\n<\/details>\n

\n

Question 7.
\nA modem is a
\n(a) modulating device only
\n(b) demodulating device only
\n(c) modulating and demodulating device
\n(d) transmitting device
\n(e) receiving device<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (c) modulating and demodulating device<\/p>\n<\/details>\n

\n

Question 8.
\nThe distance of coverage of a transmitting antenna is 12.8 km. Then, the height of the antenna is (Given that radius of earth = 6400 km)
\n(a) 6.4 m
\n(b) 12.8 m
\n(c) 3.2 m
\n(d) 16 m
\n(e) 25.6 m<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (b) 12.8 m<\/p>\n<\/details>\n

\n

Question 9.
\nIf Ec<\/sub> = 20 sin 105<\/sup> \u03c0t and Em<\/sub> = 10 sin 400 \u03c0t are carrier and modulating signals, the modulation index is
\n(a) 56%
\n(b) 30%
\n(c) 50%
\n(d) 48%
\n(e) 60%<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (c) 50%<\/p>\n<\/details>\n

\n

Question 10.
\nWhich one of the following is incorrect statement in the transmission of electromagnetic waves?
\n(a) Ground wave propagation is for high frequency transmission
\n(b) Sky wave propagation is facilitated by ionospheric layers
\n(c) Space wave is of high frequency and is suitable for line of sight communication
\n(d) Space wave is used for satellite communication
\n(e) Very high frequency waves cannot be reflected by the ionospheric layers<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) Ground wave propagation is for high frequency transmission<\/p>\n<\/details>\n

\n

Question 11.
\n1000 kHz carrier wave is amplitude modulated by the signal frequency 200 – 4000 Hz. The channel width of this case is
\n(a) 8 kHz
\n(b) 4 kHz
\n(c) 7.6 kHz
\n(d) 3.8 kHz
\n(e) 400 kHz<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) 8 kHz<\/p>\n<\/details>\n

\n

Question 12.
\nIf the TV telecast is to cover a radius of 120 km (given the radius of the earth = 6400 km), the height of the transmitting antenna is
\n(a) 1280 m
\n(b) 1125 m
\n(c) 1560 m
\n(d) 79 m
\n(d) 1050 m<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (b) 1125 m<\/p>\n<\/details>\n

\n

Question 13.
\nIdentify the incorrect statement from the following
\n(a) AM detection is carried out using a rectifier and an envelop detector
\n(b) Pulse position denotes the time of rise or fall of the pulse amplitude.
\n(c) Modulation index p is kept \u2265 1, to avoid distortion.
\n(d) Facsimile (FAX) scans the contents of the document to create electronic signals.
\n(e) Detection is the process of recovering the modulating signal from the modulated carrier wave.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (c) Modulation index p is kept \u2265 1, to avoid distortion.<\/p>\n<\/details>\n

\n

Question 14.
\nThe mobile telephones operate typically in the range of
\n(a) 1 – 100 MHz
\n(b) 100 – 200 MHz
\n(c) 1000 – 2000 MHz
\n(d) 800 – 950 MHz
\n(e) 10 – 1000 MHz<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (d) 800 – 950 MHz<\/p>\n<\/details>\n

\n

Question 15.
\nA television tower of height 140 m can broadcast its signal upto a maximum area of (Radius of earth = 6.4 \u00d7 106<\/sup>m)
\n(a) 1.56 \u00d7 106<\/sup> km\u00b2
\n(b) 5.6 \u00d7 10\u00b3 km\u00b2
\n(c) 5.6 \u00d7 1010<\/sup> km\u00b2
\n(d) 1.56 \u00d7 109<\/sup> km\u00b2
\n(e) 1.56 \u00d7 104<\/sup> km\u00b2<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (b) 5.6 \u00d7 10\u00b3 km\u00b2<\/p>\n<\/details>\n

\n

Question 16.
\nThe waves that are bent down by the ionosphere are
\n(a) ground waves
\n(b) surface waves
\n(c) direct waves
\n(d) space waves
\n(e) sky waves<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (e) sky waves<\/p>\n<\/details>\n

\n

Question 17.
\nA ground receiver in line-of-sight communication cannot receive direct waves due to
\n(a) its low frequency
\n(b) curvature of earth
\n(c) its high intensity
\n(d) smaller antenna
\n(e) both its low frequency and high intensity<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (b) curvature of earth<\/p>\n<\/details>\n

\n

Question 18.
\nIn an amplitude modulation with modulation index 0.5, the ratio of the amplitude of the carrier wave to that of the side band in the modulated wave is
\n(a) 4 : 1
\n(b) 1 : 1
\n(c) 1 : 2
\n(d) 2 : 1
\n(e) 1 : 4<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) 4 : 1<\/p>\n<\/details>\n

\n

Question 19.
\nAn example of point to point mode of communication is
\n(a) FM radio
\n(b) standard FM radio
\n(c) television
\n(d) internet
\n(e) telephony<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (e) telephony<\/p>\n<\/details>\n

\n

Question 20.
\nA signal of peak voltage 5 V at 10 kHz is modulated using a carrier wave of peak voltage 10 V at 2 MHz. The side band frequencies are
\n(a) 2010 kHz, 1990 kHz
\n(b) 2000 kHz, 1990 kHz
\n(c) 2010 kHz, 2000 kHz
\n(d) 2100 kHz, 1900 kHz
\n(e) 2200 kHz, 1800 kHz<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) 2010 kHz, 1990 kHz<\/p>\n<\/details>\n

\n

Question 21.
\nThe range of frequency bands used for television VHF service is
\n(a) 540- 1600 kHz
\n(b) 88 – 108 MHz
\n(c) 3.7-4.2 GHz
\n(d) 54 – 72 MHz
\n(e) 174 – 216 MHz<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (d) 54 – 72 MHz<\/p>\n<\/details>\n

\n

Question 22.
\nThe radiating power of a linear antenna of length l for a wave of wavelength \u03bb is proportional to
\n(a) \\(\\frac { l }{\u03bb}\\)
\n(b) \\(\\frac { l^2 }{\u03bb^2}\\)
\n(c) \\(\\frac { l }{\u03bb^2}\\)
\n(d) \\(\\frac { l^2 }{\u03bb}\\)
\n(e) \\(\\frac { l }{\u221a\u03bb}\\)<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (b) \\(\\frac { l^2 }{\u03bb^2}\\)<\/p>\n<\/details>\n

\n

Question 23.
\nA signal of 5 kHz frequency modulates a carrier of frequency 1 MHz and peak voltage 25 V. If the amplitude at the sidebands of the amplitude modulated signal is 5 V, then the modulation index is
\n(a) 0.8
\n(b) 0.6
\n(c) 0.5
\n(d) 0.2
\n(e) 0.4<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (e) 0.4<\/p>\n<\/details>\n

\n

Question 24.
\nA repeater is a combination of
\n(a) receiver and modulator
\n(b) receiver and transducer
\n(c) receiver and transmitter
\n(d) receiver and amplifier
\n(e) amplifier and transmitter<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (c) receiver and transmitter<\/p>\n<\/details>\n

\n

Question 25.
\nIf the pulse duration varies in accordance with the modulating voltage, then the modulation is called as
\n(a) PAM
\n(b) PWM
\n(c) PPM
\n(d) FM
\n(e) PCM<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (b) PWM<\/p>\n<\/details>\n

\n

Question 26.
\nThe increasing order of the frequency bands used for various communication services is
\n(a) space waves, sky waves, ground waves
\n(b) space waves, ground waves, sky waves
\n(c) sky waves, ground waves, space waves
\n(d) ground waves, sky waves, space waves
\n(e) sky waves, space waves, ground waves<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (d) ground waves, sky waves, space waves<\/p>\n<\/details>\n

\n

Question 27.
\nA point-to-point communication mode is seen in
\n(a) Satellite cable communication
\n(b) Television transmission
\n(c) FM radio transmission
\n(d) AM radio transmission
\n(e) Fax transmission<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (e) Fax transmission<\/p>\n<\/details>\n

\n

Question 28.
\nIf the heights of transmitting and the receiving antennas are each equal to h, the maximum line-of- sight distance between them is (R is the radius of earth)
\n(a) \\(\\sqrt {2Rh}\\)
\n(b) \\(\\sqrt {4Rh}\\)
\n(c) \\(\\sqrt {6Rh}\\)
\n(d) \\(\\sqrt {8Rh}\\)
\n(e) \\(\\sqrt {Rh}\\)<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (d) \\(\\sqrt {8Rh}\\)<\/p>\n<\/details>\n

\n

Question 29.
\nThe ionospheric layer acts as a reflector for the frequency range
\n(a) 1 kHz to 10 kHz
\n(b) 3 to 30 MHz
\n(c) 3 to 30 kHz
\n(d) 100 kHz to 1 MHz
\n(e) 3 GHz to 30 GHz<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (b) 3 to 30 MHz<\/p>\n<\/details>\n

\n

Question 30.
\nAn AM radio station operating at 630 kHz is permitted to broadcast audio frequencies up to 6 kHz. The band pass filter in its modulation circuit can retain the frequencies
\n(a) 636 kHz, 630 kHz
\n(b) 12 kHz, 6 kHz
\n(c) 1260 kHz, 6 kHz
\n(d) 1260 kHz, 630 kHz
\n(e) 6 kHz, 630 kHz<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) 636 kHz, 630 kHz<\/p>\n<\/details>\n

\n

Question 31.
\nA transducer, in communication system is a device that
\n(a) is a part of the antenna
\n(b) is a combination of a receiver and a transmitter
\n(c) converts audio signals into video signals
\n(d) detects the incoming signal
\n(e) converts physical variable into corresponding variations in the electrical signal<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (e) converts physical variable into corresponding variations in the electrical signal<\/p>\n<\/details>\n

\n

Question 32.
\nIdentify the mismatched pair
\n(a) Noise – Unwanted signals
\n(b) Repeater – Communication satellite
\n(c) Transducer – Energy converter
\n(d) Demodulation – Retrieval of information
\n(e) Attenuation – Strengthening of signal<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (e) Attenuation – Strengthening of signal<\/p>\n<\/details>\n

\n

Question 33.
\nPick out the wrong statement
\n(a) Analog signals provide a continuous set of values
\n(b) Digital signals represent values as discrete steps
\n(c) Analog signals cannot utilize the binary system
\n(d) Digital signals can be processed by logic gates
\n(e) Digital signals can utilize decimal as well as binary systems<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (e) Digital signals can utilize decimal as well as binary systems<\/p>\n<\/details>\n

\n

Question 34.
\nA ground receiver receives a signal at 5 MHz, transmitted by a ground transmitter at a height of 320 m, which is 110 km away from it. Then it can communicate through (radius of earth R = 6400 km)
\n(a) space waves
\n(b) ground waves
\n(c) sky waves
\n(d) both sky and ground waves
\n(e) sky waves, ground waves and space waves<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (c) sky waves<\/p>\n<\/details>\n

\n

Question 35.
\nThe power radiated by a linear antenna of length l at wavelength \u03bb is
\n(a) directly proportional to l
\n(b) inversely proportional to \u03bb
\n(c) inversely proportional to l
\n(d) directly proportional to \u03bb\u00b2<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (d) directly proportional to \u03bb\u00b2<\/p>\n<\/details>\n

\n

Hope the information shared regarding the NCERT MCQ Questions for Class 12 Physics Chapter 15 Communication Systems with Answers Pdf free download is true and genuine as far as our knowledge is concerned. If you feel any information regarding CBSE Class 12 Physics Communication Systems MCQs Multiple Choice Questions with Answers is missing do reach us and we will look into it and add it accordingly.<\/p>\n","protected":false},"excerpt":{"rendered":"

Students are advised to practice the NCERT MCQ Questions for Class 12 Physics Chapter 15 Communication Systems with Answers Pdf free download is available here. MCQ Questions for Class 12 Physics with Answers are prepared as per the Latest Exam Pattern. Students can solve these Communication Systems Class 12 MCQs Questions with Answers and assess …<\/p>\n

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