Ncert Exercises & Solutions

Precise measurements of physical quantities are essential in modern science. Which of the following situations best illustrates the need for high-precision measurements of physical quantities such as length, time, or mass?

1.	Measuring the speed of an aircraft using radar with nanosecond time resolution.
2.	Measuring the room temperature using a standard laboratory thermometer.
3.	Estimating the weight of vegetables using a mechanical balance.
4.	Observing rainfall using a manual rain gauge.

Extremely precise measurements are needed in modem science. As an example, while launching a satellite using a space launch rocket system we must measure time to a precision of 1 microsecond. Again working with lasers we require length measurements to an angstrom unit (1 A° = 10^-10m) or even a fraction of it. For estimating nuclear sizes we require a precision of 10^-15 m. To measure atomic masses using mass spectrograph we require a precision of 10^-30kg and so on.

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