Question

any four requirements for selecting a unit of a physical quantity.

Answer 1

1) The unit should be of convenient size.

2) It should be easy to describe the unit without ambiguity.

3) The unit should not vary from place to place and time to time.

I am sorry I forgot the 4th one.

Answer 2

Answer:

Four requirements for selecting a unit of physical quantity are:

1. The unit should be of convenient size.

2. It should be possible to define the unit without ambiguity.

3. The unit should be reproducible.

4. The value of unit should not change with space and time. (i.e.., it must always remain same everywhere).

HOPE IT HELPS