# NCERT Class 11 Physics Solutions: Chapter 2-Unit and Measurement Part 7 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Question: 2.11

The length, breadth and thickness of a rectangular sheet of metal are 4.234 m, 1.005 m and 2.01 cm respectively. Give the area and volume of the sheet to correct significant figures.

• Length of sheet,
• Thickness of sheet,
• Rules for determining significant figures

The given table lists the respective significant figures:

 Quantity Number Significant Figure l 4.234 4 b 1.005 4 h 2.01 3
• Hence, area and volume both must have least significant figures i.e.. 3.
• Surface area of the sheet

• Volume of the sheet

• This number has only 3 significant figures i.e.. 8,5 and 5.

Question: 2.12

The mass of a box measured by a grocer՚s balance is 2.300 kg. Two gold pieces of masses 20.15 g and 20.17 g are added to the box. What is

(a) The total mass of the box,

(b) The difference in the masses of the pieces to correct significant figures?