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  4. If the time period of oscillation of a pendulum is measured as 2.5 second using a stop watch with the least count (1/2) second, then the permissible error in the measurement is

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Q. If the time period of oscillation of a pendulum is measured as 2.5 second using a stop watch with the least count $\frac{1}{2}$ second, then the permissible error in the measurement is

KEAMKEAM 2012Physical World, Units and Measurements

Solution:

We have, $ \frac{\Delta t}{t} =\frac{0.5}{2.5}=\frac{1}{5} $
$ \frac{\Delta t}{t} \% =\frac{1}{5} \times 100=20 \% $