# NCERT Class – 9 Science solution: Chapter 1 Matter in Our Surroundings-Part 3

Question 13

Fill in the blanks:

(a) Evaporation of a liquid at room temperature leads to a __________ effect.

(b) At room temperature the forces of attraction between the particles of solid substances are __________ than those which exist in the gaseous state.

(c) The arrangement of particles is less ordered in the __________ state. However, there is no order in the __________ state.

(d) ________ is the change of gaseous state directly to solid state without going through the _________ state.

(e) The phenomenon of change of a liquid into the gaseous state at any temperature below its boiling point is called__________.

(a) Cooling

(b) Stronger

(c) Liquid, gaseous

(d) Sublimation, liquid

(e) Evaporation

Question 14

Match the physical quantities given in column A to their SI units given in column: B

 Physical quantities SI units A Pressure i Cubic metre B Temperature ii Kilogram C Density iii Pascal D Mass iv Kelvin E Volume v Kilogram per cubic metre Image of What is SI Unit Image of what is SI unit

Question 15

The non SI and SI units of some physical quantities are given in column A and column B respectively. Match the units belonging to the same physical quantity:

 Column A Column B A Degree Celsius i Kilogram B Centimeter ii Pascal C Gram per centimeter cube iii Metre D Bar iv Kelvin E Milligram v Kilogram per metre cube

Question 16

‘Osmosis is a special kind of diffusion’. Comment.