Question

Give reasons for the following:

1. Relative density has no unit.
2. Density of a substance decreases with the increase in temperature.
3. Equal mass of different substances does not have same volume.
4. Equal volume of different substances have different masses.
5. The lower end of a hydrometer is filled with mercury or lead.
6. Bodies like cork or wood float on water.
7. An iron needle sinks in water, but it floats on mercury of density 13.6 g/cm'.
8. It is easier to swim in sea water than in river water.
9. Relative density remains same in all systems of unit.​

Answer 1

Answer:

1) RD has no unit because it is the ratio of same of same unit

2) because density is directly proportional to buoyant force and when buoyant force increase the temperature will decrease

3) because when 2kg substance will placed in sphere then it has the volume of sphere but when we put it in cone then it has the volume of cone

4) Reverse of question number 3

5) because it helps hydrometer to float vertically in liquid

6) because it has lower density than water

7) I don't know sorry

8) because the density of sea water is more than river water and density is directly proportional to buoyant force

9) because it has no unit or 1 so it is same in all unit

Explanation:

I hope this will help you