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Subject :NSO    Class : Class 9

Which of the following statements is/are correct?
I. Sound wave does not follow the same law of reflection as light does.
II. Tone is a sound of a single frequency while note is a mixture of several frequencies.
III. Infrasonic waves are used in SONAR.
IV. The numerical ratio of displacement to distance for a moving object is always less than one.
V. The value of acceleration due to gravity is least on equator.

AII only
BI, II and III only
CIV and V only
DII and V only

II is wrong, since note is the single frequency.

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