1Which physical quantities are the scale, the stopwatch and the protractor used to measure?
2What is the value of the smallest amount that can be measured with each of these instruments?
3What is least count? Write it with one example.
4Show by calculation that the least count of a scale is 1 mm.
5Why is a wristwatch not enough to separate the first and second runners in a 100 metre race? Which instrument is needed and why?
6A scale gives the thickness of a notebook as 1.2 cm. What is the least count of that instrument? Give the reason.
7Write the importance of least count in scientific study.