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If sound level is measured on different days but the instrument position changes each time why is the comparison weakened?

Answer and explanation

Correct answer: Position may affect the measured sound level

Direct answer: A, position may affect the measured sound level. Sound travels through space, and the reading can change with the instrument’s distance, direction, height, nearby walls, and obstacles. Therefore, if the position changes on different days, a different reading may be caused by position rather than a real change in sound. Step by step: keep the same instrument, place it at the same distance and direction, and then compare readings. A is correct because position can affect sound reaching the sensor. B is wrong because sound level can be measured. C is wrong because the day may matter, but changing position is the stated problem. D is wrong because position changes readings, not merely colour. Memory cue: fair comparison means change one factor and keep the others constant.

Related tags

Sound LevelControlled ConditionInstrument PositionScientific Questions And ObservationsExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceScienceClass 9 Mcq

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