1. What are the characteristics of a physical quantity?

2. Differentiate between fundamental and derived units.

3. What is the difference between mass and amount of a substance?

4. Derive the unit of the following quantities:

(i) Force = Mass × acceleration
(ii) Pressure = Force/Area

5. Represent 237 nm in metres.

6. You are given some words like pans, beam, pointer, weights, objects. Use these words to fill up blanks in the following paragraph, which gives a general description of a balance.
“A balance has two_____________supported from a rigid_____________ At the center of the support there is a _____________which is free to move. In one pan the _____________to be measured are placed. In the other pan _____________ are placed one by one to balance both the pans.