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Physics Sound Question paper

1 pages, 21 questions, 6 questions with responses, 6 total responses,    1    0
Nilanjan Das
St. Xavier's College (SXC), Kolkata
Master of Science Biotechnology
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ICSE Physics Test SOUND By Nilanjan Das ( xaveriannilanjan@outlook.com ) F.M. 40 Time: 1 hr. Section I [Compulsory] [20 marks] Question 1. a. What is SONAR? b. What are conditions for hearing an Echo? c. What is Reverberation? d. Calculate the minimum distance in air required between the source of sound and the obstacle to hear an echo. (Take speed of sound in air = 350 m/s) e. Differentiate Free and forced vibrations. [5x2] Question 2. a. Why do string instruments have sound boxes? b. Define Resonance. c. State two conditions for Resonance to occur. d. Draw graphs showing the nature of a soft and loud notes. e. Define pitch. What objective quantity of a sound wave determines pitch? [5x2] Section II [Attempt any two questions] [20 marks] Question 3. a. What is noise pollution? State two measures by which we can curb it. b. What do you understand by the term quality of a musical note? Illustrate your answer with a diagram. c. A, B, C and D are four pendulums suspended from the same elastic string XY. Lengths of pendulum A and D are equal., while the length of B is smaller and C is longer. The pendulum A is set into vibration. What is your observation? Give reason. d. Give the displacement-time graph for Damped oscillations. [3+3+2+2] Question 4. a. In which medium is Natural vibration theoretically possible? Why is it not possible under practical conditions? b. A person standing between two vertical cliffs produces a sound. Two successive echoes are heard at 4 s and 6 s. Calculate the distance between the two cliffs. c. Differentiate Forced and Resonant vibrations. [3+4+3] Question 5. a. A man standing in front of a hill produces an articulate sound and hears its echo after 4.5 second. He then moves 250 m towards the hill and produces the same sound. Its echo is now heard after 3.1 second. Find the original distance of the man from the hill and the velocity of sound. b. Give two points of difference between light and sound. c. State the unit of Loudness. d. State one medical use of echo. [6+2+1+1]

 

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