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Which instrument can be used to measure time?

Answer and explanation

Correct answer: Stopwatch

The direct answer is B, stopwatch. Time tells us when an event occurs or how long an interval lasts. A stopwatch is designed to start, stop, and display elapsed time, so it is suitable for measuring a race, reaction, or dissolving interval. Option A, a thermometer, measures temperature. Option B is correct because it measures a time interval, usually in seconds or minutes. Option C, a balance, measures mass by comparing an object with standard masses or an electronic sensor. Option D, a metre scale, measures length or distance. The instrument must match the physical quantity: time with a stopwatch, temperature with a thermometer, mass with a balance, and length with a scale. Exam cue: identify the quantity before choosing the instrument.

Related tags

StopwatchTime MeasurementApparatusHypothesis And ExperimentationExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceScienceClass 9 Mcq

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