# 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

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