MCQEasy1 mark
1
Choose the correct answers to the questions from the given options. (Do not copy the questions, write the correct answers only.)
Assertion (A) : As the level of water in a tall measuring cylinder kept under running tap rises, the pitch of sound gradually increases. Reason (R) : Frequency of sound is inversely proportional to the length of the water column. (a) Both (A) and (R) are true and (R) is correct explanation of (A). (b) Both (A) and (R) are true and (R) is not the correct explanation of (A). (c) (A) is true but (R) is false. (d) (A) is false but (R) is true.
Topic: Pitch and vibrating air column
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Answer
Exam answer
(c) Assertion is true but Reason is false.
Explanation
As water rises, the air-column length decreases, so its frequency and pitch increase. The stated relation with the water-column length is false.
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