Communication Systems CBSE Class 12 PYQ Chapter Wise

Explore: All CBSE Class 12 chapters · CBSE Class 12 Physics PYQs · CBSE Class 12 hub · Syllabus & pattern · Class 12 2026

Answer first

Communication Systems PYQs (previous year questions) for CBSE Class 12: Communication Systems (Physics) had 11 questions across the 50 official CBSE Class 12 papers we tagged (2016–2026), and appeared in 4 of them. Asked in 4 of 10 years; last in 2019. The concepts asked in the most papers: Sky Wave Propagation, Space Wave Propagation, Modulation Index.

Year-wise question count

Asked in 4 of 10 years.

Most-asked concepts

Sorted by the number of papers a concept appeared in.

How to practise Communication Systems PYQs

1. Start with the concepts at the top of the table. They have come back the most.
2. Solve one year’s Communication Systems questions from the official PDF against the clock, then check the answer listed below.
3. Log every miss as a concept gap, a calculation slip or a misread. Each needs a different fix.
4. Once a concept is clean in two papers, move to the next. Then sit a full paper from the year pages.

Questions by year

Each line gives the question number and paper, type, concept, our one-line summary, with a link to the official PDF.

CBSE Class 122019

• Q.5 (Physics (55/1/1)) · Very short answer · Sky Wave Propagation: Why sky wave signals are limited to below 30 MHz PDF
• Q.10 (Physics (55/1/1)) · Short answer · Space Wave Propagation: Range limit of TV tower signals and optimum antenna separation PDF
• Q.24 (Physics (55/1/1)) · Short answer · Modulation Index: Modulation index from max/min amplitudes and from given signals PDF

CBSE Class 122018

• Q.5 (Physics (55/1)) · Very short answer · Sky Wave Propagation: Propagation mode used by short wave broadcast services PDF
• Q.10 (Physics (55/1)) · Short answer · Modulation Index: Peak modulating voltage for 60% modulation index on a 15 V carrier PDF
• Q.22 (Physics (55/1)) · Short answer · Need for Modulation: Reasons for modulation; sketch audio, carrier and AM waves PDF

CBSE Class 122017

• Q.12 (Physics (55/1)) · Short answer · Amplitude Modulation: How AM is achieved; carrier, signal frequency and bandwidth from side bands PDF
• Q.18 (Physics (55/1)) · Short answer · Communication System Elements: Block diagram of a communication system and roles of its parts PDF

CBSE Class 122016

• Q.5 (Physics (55/1/N)) · Very short answer · Amplitude Modulation: Side band frequencies for a 5 kHz signal on a 2 MHz carrier PDF
• Q.9 (Physics (55/1/N)) · Short answer · Need for Modulation: Two reasons why a baseband signal is not transmitted directly PDF
• Q.20 (Physics (55/1/N)) · Short answer · Space Wave Propagation: Space wave propagation, its limits and line-of-sight distance PDF

Other Physics chapters

• Electric Charges and Fields PYQs
• Electrostatic Potential and Capacitance PYQs
• Current Electricity PYQs
• Moving Charges and Magnetism PYQs
• Magnetism and Matter PYQs
• Electromagnetic Induction PYQs
• Alternating Current PYQs
• Electromagnetic Waves PYQs
• Ray Optics and Optical Instruments PYQs
• Wave Optics PYQs
• Dual Nature of Radiation and Matter PYQs
• Atoms PYQs
• Nuclei PYQs
• Semiconductor Electronics PYQs

FAQ

How many Communication Systems questions come in CBSE Class 12?

In the official papers we tagged: 3 in 2019, 3 in 2018, 2 in 2017 and 3 in 2016. Not asked in the other 6 years. That is 11 questions in all, about 4% of Physics.

Which Communication Systems topics repeat in CBSE Class 12?

Asked in the most papers: Sky Wave Propagation, Space Wave Propagation, Modulation Index. The concept table lists every one with its count.

Are these official CBSE Class 12 questions?

Yes. Every question is from an official CBSE Class 12 paper hosted on our year pages. The one-line summaries are ours; open the PDF linked beside each question for the full text.