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Friday, 9 October

JEE Main Physics · Class 12

Communication Systems: JEE Main previous year questions

Communication Systems had 12 questions in the 42 JEE Main shifts Lumi analysed, about 0.4 a shift, asked in 12 of 42 shifts. It ranks 29 of 29 Physics chapters by questions; 0% of its questions were hard.

Questions
12
in 12 of 42 shifts
A shift, on average
0.4
of 25 Physics questions
Since 2024
-0.6
0.6 a shift in 2017–23, 0.0 in 2024–26
Numerical answer
1
8% of its questions

Year by year

How often it came

Questions in the analysed shifts of each year. Years differ in how many shifts Lumi analysed, so read the bars with the shift count.

Questions each year
0241’171’203’214’223’230’240’250’26

2017: 1 shifts · 2020: 4 shifts · 2021: 4 shifts · 2022: 4 shifts · 2023: 4 shifts · 2024: 8 shifts · 2025: 8 shifts · 2026: 9 shifts

Difficulty by year
  • 20171
  • 20201
  • 20213
  • 20224
  • 20233
  • 2024
  • 2025
  • 2026
  • Easy
  • Medium
  • Hard

Inside the chapter

Topics and the ideas that repeat

0 topics and 0 distinct ideas; 0 ideas were asked more than once. Most questions are single correct and calculation.

Topics, by questions

    12 questions had no close topic in our taxonomy and are counted for the chapter only.

    Ideas asked most
    0 repeat

    No question here had a close idea in our taxonomy.

    Every question

    All 12 Communication Systems questions

    Newest first. Each opens with its options and the official answer.

    2023 3 questions

    1. 6 Apr 2023, Shift 1 · Q31By what percentage will the transmission range of a TV tower be affected when the height of the tower is increased by 21% ?EasySingle correct
    2. 11 Apr 2023, Shift 1 · Q31A transmitting antenna is kept on the surface of the earth. The minimum height of receiving antenna required to receive the signal in line…EasySingle correct
    3. 13 Apr 2023, Shift 2 · Q50To radiate EM signal of wavelength λ\lambda with high efficiency, the antennas should have a minimum size equal to :EasySingle correct

    2022 4 questions

    1. 25 Jul 2022, Shift 1 · Q60The required height of a TV tower which can cover the population of 6.036.03 lakh is hh. If the average population density is 100100 per…MediumNumerical value
    2. 28 Jul 2022, Shift 1 · Q50In the case of amplitude modulation to avoid distortion the modulation index (μ\mu) should be :EasySingle correct
    3. 24 Jun 2022, Shift 1 · Q46A baseband signal of 3.5 MHz frequency is modulated with a carrier signal of 3.5 GHz frequency using amplitude modulation method. What…MediumSingle correct
    4. 29 Jun 2022, Shift 1 · Q50Only 2% of the optical source frequency is the available channel bandwidth for an optical communicating system operating at 1000 nm. If an…MediumSingle correct

    2021 3 questions

    1. 25 Jul 2021, Shift 1 · Q4In Amplitude Modulation, the message signal Vm(t)=10sin⁡(2π×105t)V_m(t)=10\sin(2\pi\times10^5t) volts and Carrier signal Vc(t)=20sin⁡(2π×107t)V_c(t)=20\sin(2\pi\times10^7t)…EasySingle correct
    2. 16 Mar 2021, Shift 2 · Q1Two identical antennas mounted on identical towers are separated from each other by a distance of 45 km. What should nearly be the minimum…MediumSingle correct
    3. 18 Mar 2021, Shift 1 · Q18Match List - I with List - II. List - I (a) 10 km height over earth's surface (b) 70 km height over earth's surface (c) 180 km height over…EasyMatch the list

    2020 1 questions

    1. 2 Sep 2020, Shift 1 · Q19An amplitude modulated wave is represented by the expression vm=5(1+0.6cos⁡6280t)sin⁡(211×104 t)v_m=5(1+0.6\cos 6280t)\sin(211\times10^{4}\,t) volts The minimum and…EasySingle correct

    2017 1 questions

    1. 2 Apr 2017 (offline) · Q28In amplitude modulation, sinusoidal carrier frequency used is denoted by ωc\omega_c and the signal frequency is denoted by ωm\omega_m. The…EasySingle correct

    Pattern: Asked most years.