Write the rules that are followed in writing the symbols of units in SI system.

Write the need of a standard unit.

Differentiate mass and weight.

What is the measuring unit of the thickness of a plastic carry bag?

How will you measure the least count of vernier caliper?

What are the fundamental physical quantities and their units?

Copy and complete the table.

Measurement	Unit	Symbol
Length	----	---
--	Kilogram	--
--	--	S

The mass of an object is 5 kg. What is its weight on the earth?

While measuring the diameter of an iron nail using a screw gauge, the reading on the pitch scale is found to be 1.5 mm and the head scale reading is 20. If the least count is 0.01 mm and the zero error is + 0.05 mm, find the diameter of the iron nail.

The Main scale reading is 3.8 Vernier scale coincidence = 5^th division. No zero error. Find the length of the iron cylinder.