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Physics - Communication System

Practise 71 AP EAMCET previous year questions on Communication System, compiled from papers spanning 2012 to 2025. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty AP EAMCET tests.

Communication System has been asked in 12 of the 24 years of AP EAMCET papers analysed (2001–2024), with 71 questions in all. 72% of them were easy, 28% moderate and 0% tough. Most of its questions came from 2022, with 11 questions that year. In the last three years (2022–2024) it had 28 questions across 28 papers, about 1 per paper.

The chapter's 3 topics are not weighted equally: Modulation (47 questions, 66%), Communication System (17 questions, 24%), and Propagation of EM Waves (7 questions, 10%) have been asked the most. Modulation has also led over the last five years, with 29 questions.

  1. 1In amplitude modulation, if a message signal of 5 kHz is modulated by a carrier wave of frequency 900 kHz, then the frequencies of the side 27 May, 2025 (M)Modulation
  2. 2The heights of tansmitting and receiving antennas are respectively and times the radius of the earth. The maximum distance between these two26 May, 2025 (M)Propagation of EM Waves
  3. 3The layer of the atmosphere that reflects low frequency (LF) electromagnetic waves during day time only is26 May, 2025 (E)Propagation of EM Waves
  4. 4If the ratio of the maximum and minimum amplitudes of an amplitude modulated wave is , then the modulation index is24 May, 2025 (M)Modulation
  5. 5If the maximum and minimum amplitudes of a modulated wave are 25 V and 5 V respectively, then the modulation index is23 May, 2025 (M)Modulation
  6. 6Ionosphere acts as a reflector for the frequency range of23 May, 2025 (E)Propagation of EM Waves
  7. 7If in an amplitude modulated wave, the maximum amplitude is 14 V and the modulation index is 0.4, then the amplitude of the carrier wave is22 May, 2025 (M)Modulation
  8. 8For transmitting a signal of frequency 1000 kHz, the minimum length of the antenna is22 May, 2025 (E)Modulation
  9. 9If the sum of heights of transmitting and receiving antennas in line of sight of communication is ' h ', then the height of receiving antenn21 May, 2025 (M)Modulation
  10. 10In amplitude modulation of waves, the maximum amplitude is 30 mV and minimum amplitude is 5 mV, then the modulation index is21 May, 2025 (E)Modulation
  11. 11Size of the antenna for a carrier wave of frequency 3 MHz is23 May, 2024 (M)Modulation
  12. 12The maximum distance between the transmitting and receiving antennas for satisfactory communication in line of sight mode is 57.6 km . If th22 May, 2024 (M)Communication System
  13. 13Which one of the following is not classified as pulse modulation22 May, 2024 (E)Modulation
  14. 14An information signal of frequency 10 kHz is modulated with a carrier waive of frequency 3.61 MHz. The upper side and lower side frequencies21 May, 2024 (M)Modulation
  15. 15A carrier is simultaneously modulated by two sine waves with modulation indices of 0.3 and 0.4 ; then the total modulation index is20 May, 2024 (M)Modulation
  16. 16In amplitude modulation, the amplitude of the carrier ware is 10 V and the amplitude of one of the side bands is 2 V . Then the modulation i20 May, 2024 (E)Modulation
  17. 17A message signal of 3 kHz is used to modulate a carrier signal frequency 1 MHz using amplitude modulation. The upper side band frequency and19 May, 2024 (E)Communication System
  18. 18If the maximum and minimum voltages of an A.M wave are and respectively, Then the modulation factor ' ' is18 May, 2024 (M)Modulation
  19. 19A message signal of frequency is used to modulate a carrier of frequency , then the frequencies of side bands are19 May, 2023 (M)Modulation
  20. 20Digital signal18 May, 2023 (M)Communication System
  21. 21For an amplitude modulated wave, the maximum and minimum amplitudes are and respectively. Then the modulation index is18 May, 2023 (E)Modulation
  22. 22The radio horizon of the transmission of an antenna placed on floor in a shopping mall, where the height of each floor is is (Radius of eart17 May, 2023 (M)Modulation
  23. 23The refractive index of ionosphere is17 May, 2023 (E)Propagation of EM Waves
  24. 24An amplitude modulate wave is represented by volt where is in seconds. Then the ratio of the upper to the lower side band frequencies is16 May, 2023 (M)Modulation
  25. 25The process of retrieval of information from the carrier wave16 May, 2023 (E)Modulation
  26. 26A carrier wave of peak voltage is used to transmit a message signal. If the modulation index is , then the peak voltage of the modulating si15 May, 2023 (M)Modulation
  27. 27Band width of an optical fiber is15 May, 2023 (E)Communication System
  28. 28The amplitude of the side bands of the modulated signal if the carrier signal and message signal amplitudes are and respectively is08 Jul, 2022 (M)Modulation
  29. 29A carrier wave of peak voltage is used to transmit a message signal. Then the peak voltage of the modulating signal in order to have a modul08 Jul, 2022 (E)Modulation
  30. 30The frequency band for uplink satellite communication in the following is07 Jul, 2022 (M)Communication System
  31. 31The minimum size of an antenna for transmitting electromagnetic waves at is07 Jul, 2022 (E)Modulation
  32. 32A message signal of frequency and peak voltage is used to modulate a carrier of frequency 1.2 MHz and peak voltage . The modulation index is06 Jul, 2022 (M)Modulation
  33. 33Microwaves are used in the following06 Jul, 2022 (E)Communication System
  34. 34The maximum amplitude of an AM wave is found to be while its minimum amplitude is . The modulation index is06 Jul, 2022 (E)Modulation
  35. 35Frequencies in the UHF range normally propagate by means of05 Jul, 2022 (M)Communication System
  36. 36The frequency suitable beyond the horizon communication using sky wave is05 Jul, 2022 (E)Propagation of EM Waves
  37. 37The maximum number of TV signals, that can be transmitted along a co-axial cable is04 Jul, 2022 (M)Communication System
  38. 38A carrier wave is used to transmit a message signal. If the peak voltage of modulating signal and carrier signal are increased by 1 % and 3 04 Jul, 2022 (E)Modulation
  39. 39In 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 modulat25 Aug, 2021 (E)Modulation
  40. 40In a communication system operating at wavelength , only one per cent of source frequency is available as signal bandwidth. The number of ch24 Aug, 2021 (M)Communication System
  41. 41A radio receiver antenna that is long is oriented along the direction of the electromagnetic wave and it receives a signal of intensity . Th24 Aug, 2021 (E)Modulation
  42. 42If the highest modulating frequency of the wave is , then the number of stations that can be accommodated in a bandwidth is23 Aug, 2021 (M)Communication System
  43. 43The process of increasing the strength of a signal using an electronic circuit is called23 Aug, 2021 (E)Modulation
  44. 44In an amplitude modulated signal the maximum amplitude is 15 V and minimum amplitude is 5 V . The amplitude of modulating wave will be19 Aug, 2021 (E)Modulation
  45. 45A T.V. tower has a height of . The average population density around the tower is and radius of the earth is . The population covered is07 Oct, 2020 (Special)Modulation
  46. 46For television broadcasting the frequency employed is normally in range,23 Sep, 2020 (M)Communication System
  47. 47A speech signal of is used to modulate a carrier signal of frequency , using amplitude modulation. The frequencies of the side bands will be22 Sep, 2020 (E)Modulation
  48. 48An AM wave has \(1800 {~W}\) of total power content for \(100 \%\) modulation the carrier should have power content equal to18 Sep, 2020 (M)Modulation
  49. 49If \(E_c\) and \(E_m\) are peak values of carrier and modulating signals, respectively then for \(100 \%\) modulation,23 Apr, 2019 (M)Modulation
  50. 50A TV tower has a height \(160 {~m}\). Its coverage range is nearly (Earth's radius, \(R_e=6400 {~km}\))22 Apr, 2019 (M)Modulation

Frequently Asked Questions

1.How many questions are available for Communication System?

This chapter includes 71 questions compiled from AP EAMCET papers spanning 2012 to 2025.

2.Are these questions only from AP EAMCET, or from other exams too?

These are AP EAMCET questions specifically for the Communication System chapter. Questions from other exams like JEE Main or NTA Abhyas (JEE Main) are organised separately under their respective exam sections.

3.Is Communication System an important chapter for AP EAMCET Physics?

Communication System has appeared in 13 of the 25 years of AP EAMCET papers covered here, with 71 questions across 70 papers - about one per paper it appears in.

4.What is the difficulty level of Communication System questions in AP EAMCET?

Of the 71 questions analysed for this chapter, 72% are easy, 28% moderate and 0% tough. 2022 had the most, with 11 questions.

5.Which topics in Communication System should I focus on?

These topics have carried the most weightage in Communication System:

  • Modulation - 47 questions (66%)
  • Communication System - 17 questions (24%)
  • Propagation of EM Waves - 7 questions (10%)
6.Is Communication System's weightage in AP EAMCET going up or down?

Across all 70 papers analysed, Communication System has averaged about 1.0 questions per paper. In the last three years (2022–2024), that average has stayed about the same, at about 1.0 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.