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Physics - Waves and Sound

Practise 6 IAT (IISER) previous year questions on Waves and Sound, compiled from papers spanning 2017 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 IAT (IISER) tests.

Waves and Sound has been asked in 4 of the 9 years of IAT (IISER) papers analysed (2017–2026), with 6 questions in all. 0% of them were easy, 100% moderate and 0% tough. Most of its questions came from 2023, with 1 question that year. In the last three years (2023–2026) it had 1 question across 3 papers, about 0.3 per paper.

The chapter's 4 topics are not weighted equally: Doppler's Effect (2 questions, 33%), Vibration of String (2 questions, 33%), and Travelling Waves (1 question, 17%) have been asked the most. Over the last five years the most frequent topics have been Vibration of String (2), Doppler's Effect (1), and Interference and Superposition of Waves (1).

  1. 1Consider two pipes and of identical length. has one end closed and one end open. has both ends open. Each tube is immersed in a closed chamb2025Vibration of String
  2. 2Consider two waves, which are given by and , where is the wave number and is the angular frequency. The amplitude of the resultant waveform 2025Interference and Superposition of Waves
  3. 3The frequency of the whistle of a train moving with a constant speed is observed by a stationary detector on the platform to be . The freque2023Doppler's Effect
  4. 4A uniform taut string with two point charges and attached to its ends passes over two massless pullies kept distance apart as shown in the f2022Vibration of String
  5. 5An ambulance traveling at a speed emits a sound of frequency 540 Hz from its siren. Sunanda is driving a car which approaches the ambulance 2021Doppler's Effect
  6. 6The transverse displacement at position and time in a string due to a travelling wave is given by , where is in centimeters and is in second2017Travelling Waves

Frequently Asked Questions

1.How many questions are available for Waves and Sound?

This chapter includes 6 questions compiled from IAT (IISER) papers spanning 2017 to 2025.

2.Are these questions only from IAT (IISER), or from other exams too?

These are IAT (IISER) questions specifically for the Waves and Sound chapter. Questions from other exams like JEE Main or NTA Abhyas (JEE Main) are organised separately under their respective exam sections.

3.Is Waves and Sound an important chapter for IAT (IISER) Physics?

Waves and Sound has appeared in 5 of the 10 years of IAT (IISER) papers covered here, with 6 questions across 5 papers - about one per paper it appears in.

4.What is the difficulty level of Waves and Sound questions in IAT (IISER)?

Of the 6 questions analysed for this chapter, 0% are easy, 100% moderate and 0% tough. 2023 had the most, with 1 question.

5.Which topics in Waves and Sound should I focus on?

These topics have carried the most weightage in Waves and Sound:

  • Doppler's Effect - 2 questions (33%)
  • Vibration of String - 2 questions (33%)
  • Travelling Waves - 1 question (17%)
6.Is Waves and Sound's weightage in IAT (IISER) going up or down?

Across all 5 papers analysed, Waves and Sound has averaged about 1.2 questions per paper. In the last three years (2023–2026), that average has fallen, at about 0.3 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.