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Important Questions

Waves

ICSE · Class 11 · Physics

Most important questions from Waves for ICSE Class 11 Physics board exam 2026. MCQs, short answer, and long answer questions with marks.

62 questions34 flashcards5 concepts

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A comparison showing the key differences between mechanical waves (requiring a medium, e.g., sound, water waves) and electromagnetic waves (not requiring a medium, e.g., light, radio waves). Include e
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62 Questions·
multiple choicemultiple correct

Sample Questions

1multiple choice
3 marks

A wave has period 0.2 s and wavelength 1.5 m. What is its speed?

Show answer

7.5 m/s

First find frequency using n = 1/T = 1/0.2 = 5 Hz. Then use v = nλ = 5 × 1.5 = 7.5 m/s. Two steps are needed.

2multiple choice
3 marks

A wave is written as y = 0.05 sin 2π(t/0.4 - x/1.2). What is its speed?

Show answer

3 m/s

Compare with y = a sin 2π(t/T - x/λ). Here T = 0.4 s and λ = 1.2 m. Use v = λ/T = 1.2/0.4 = 3 m/s, or v = nλ with n = 1/T = 2.5 Hz.

3multiple choice
3 marks

A particle at distance x = 0.75 m from the origin has phase lag φ = kx. If λ = 1.5 m, what is φ?

Show answer

π rad

Use k = 2π/λ = 2π/1.5 = 4π/3 rad/m. Then φ = kx = (4π/3) × 0.75 = π rad. So the phase lag is π rad.

4multiple choice
3 marks

Two particles in a wave are separated by 3 m. If the wavelength is 1.5 m, what is their phase difference?

Show answer

4π rad

Use Δφ = (2π/λ)Δx. Here Δx = 3 m and λ = 1.5 m. So Δφ = (2π/1.5) × 3 = 4π rad.

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Frequently Asked Questions

What are the important topics in Waves for ICSE Class 11 Physics?
Waves covers several key topics that are frequently asked in ICSE Class 11 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Waves — ICSE Class 11 Physics?
Understand the core concepts first, then work through the 62 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.
How many important questions are there in Waves?
There are 62 practice questions available for Waves. These cover multiple question types including MCQs, short answer, and long answer questions.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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All 30 chapters — ICSE Class 11 Physics Important Questions

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