Question

4. When water gets solidified into ice, then heat is
(a) Absorbed
(b) Evolved
(c) First absorbed then evolved
(d) Initially evolved and then absorbed.
5. During summer, water kept in an earthen pot becomes cool because of the phenomenon of:
(a) Diffusion
(b Transpiration
(c) Evaporation
(d) Osmosis
6. The state of matter which is found to be more stable at lower temperature:
(a) Solid
(b) Liquid
(c) Gas
(d) BEC
7. Distinguish between solids, liquids and gases in tabular form under following characteristics
(a) Kinetic energy of particles
(b) Density
(c) Diffusion
8. Explain the following
(a) Gases exert pressure on the walls of the container
(b) evaporation causes cooling effect
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Answer 1

Answer:

5 - evaporation

8 a - particles of gas move randomly in all directions at high speed. As a result, the particles hit each other and also hit the wall of the container with a force. Therefore, gas exerts pressure on the wall of the container.

8 b - Evaporation is the process of changing liquid into gas or vapour at any temperature below it's boiling point.

it is cooling effect because by increasing in temperature the kinetic energy will also increase among the particles the it gets free to move and then it gets evaporated quickly and easily and after evaporation it causes cool effect