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JEE Main Physics question

PhysicsUnits and MeasurementJEE Main

The least count of a stop watch is . The time of 20 oscillations of a pendulum is measured to be . The percentage error in the measurement of time will be

Answer: (C)

Solution

Percentage error \dfrac{Δ t}{t}\dfrac{0.2}{25}$×100

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Question ID VK-157133