Question

4. (a) Kerosene and water are taken in a beaker. Which liquid has less density?

(b) if liquids like petrol and diesel etc catch fire one should never try to extinguish it using water,why? ​

Answer 1

Answer:

(a).As kerosene has more refractive index than water, it is optically denser. The mass density of kerosene is less than water, so kerosene drops will float in water, when both are mixed.

Explanation:

(b).As water is heavier than petrol therefore slips down permitting the petrol to rise to the surface and continue to burn. Besides, the existing temperature is so high that the water poured on the fire evaporates even before it can extinguisher the fire. ... Thus the petrol fire cannot be extinguished by water.

what is optical density??

optical density is the measure of absorbance, and is defined as the ratio of the intensity of light falling upon a material and the intensity transmitted, on the other hand mass density tells us that how much amount of mass is contained per unit volume. Light travells slowly in optically denser medium.

Answer 2

Answer:

a)kerosene

b)As water is heavier than petrol therefore slips down permitting the petrol to rise to the surface and continue to burn.

Explanation:

hope it was helpful