Guess Paper Year 2011
CBSE Class IX
Subject: Physics
Topic: Sound
1. what type of wave is sound wave?
(a) radio waves
(b) electro magnetic wave
(c) mechanical wave
(d) transverse wave
2. SONAR works on principle of
(a) echo
(b) resonance
(c) particle nature of wave
(d) none
3. Loudness depends on
(a) wave length
(b) frequency
(c) amplitude
(d) intensity
4. Pitch increases with increase in
(a) energy of sound
(b) frequency
(c) wave length
(d) amplitude
5. speed of sound greatest in
(a) milk
(b) wood
(c) iron
(d) air
6. The sound whose frequency is between 20 Hz to 20000 Hz is
(a) infrasonic wave
(b) audible sound
(c) ultrasonic wave
(d) radio waves
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