NCERT 9th Class (CBSE) Science: Gravitation Quiz
18 Multiple Choice Questions related to NCERT 9th Class (CBSE) Science: Gravitation Quiz:
- Lactometer is a device used to find the purity of a given sample of milk. Hydrometer is a device used to find the density of liquids.
- The pressure exerted by it can be distributed to more area, and avoid the wear and tear of tyres.
- The density of sea water is more due to dissolved salts in it as compared to the density of river water. Hence the buoyant force exerted on the swimmer by the sea water is more which helps in floating and makes swimming easier.