Chapter 2 - Physical Quantities and Measurements

1. Sanchita - Unit of relative density

1.1. it does not have any units

1.2. It is dimensionless quantity

1.3. It is the ratio of same quantity

2. ADITI - Density Bottle is used to determine density of liquid.It is a glass bottle having glass stopper with a hole. This Bottle always has same volume of liquid.

3. Dhruv- Relation between S.I. and C.G.S. units:- 1Kg m^-3= 1Kg/1m^3= 1000g/(100cm)^3= 1/1000g cm^-3. Thus, 1Kg m^-3= 10^-3 g cm^-3 or 1g cm^-3= 1000Kg m^-3

4. Shreyan- flating_ Body floats on a liquid whien the density of Body is less than the density of liquid.sinking_Body floats on the liquid when

5. Shivam - Introduction of Chapter 2

6. Arya- Determination of Density of a regular solid = volume of cube = (one side)³ Volume of cuboid=length * breadth*height Volume of sphere= 4/3 (radius)³ Volume of cylinder=(radius)² * height (where = 3.14) .

7. *standard unit=k(kelvin)

8. Relative Density - It is defined as the ratio of density of a substance to the density of water - Symbol - R.D. ....Formula - R.D. - Density of a substance/Density of Water ..............E.g. - Density of Iron is 7.8 gm/cm3 and density of water is 1 gm/cm3 .... Hence - R.D. - Density of Iron/Density of water..............R.D. = 7.8 / 1 = 7.8 Answer