9th Physics Chapter1 Physical Quantities and Measurement

1. What is a physical quantity, and how does it differ from a scalar quantity?
Differentiate between precision and accuracy in measurements, providing examples.

2. Explain the principle of operation of a lever balance in measuring mass.
Explain the working principle of an electronic balance.

3. Describe the proper technique for using a stopwatch to measure time accurately.
Explain the correct method for reading the volume from a measuring cylinder.

4. Explain the principle of operation of a screw gauge.
How is the least count of a screw gauge calculated?

5. Explain the significance of the coefficient in scientific notation.
When is it appropriate to use scientific notation in physics calculations?