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Class 9 Science — Chapter 11: Sound
90 practice questions · 30 Easy · 30 Medium · 30 Hard
Free NCERT-aligned multiple-choice practice for Class 9 Science, Chapter 11 (Sound). Practise timed Easy, Medium and Hard quizzes with instant explanations — built for CBSE Board exams, JEE Main and NEET UG. Here are a few sample questions; sign in free to practise all 90.
Sample questions
Q1Easy
Sound waves cannot travel through:
A.Air
B.Water
C.Steel
D.Vacuum✓ correct
Why
Sound needs a medium (solid/liquid/gas). It cannot travel through vacuum.
Q2Medium
SONAR uses:
A.Radio waves
B.Visible light
C.Ultrasonic waves✓ correct
D.X-rays
Why
SONAR (Sound Navigation And Ranging) sends ultrasonic pulses underwater.
Q3Hard
Wavelength of a sound wave with frequency 340 Hz in air (v = 340 m/s) is:
A.0.1 m
B.1 m✓ correct
C.3.4 m
D.34 m
Why
λ = v/f = 340/340 = 1 m.
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