The mass per unit volume of a substance is called density (density = mass/ volume). Arrange the following in order of increasing density-air, exhaust from chaimnays, honey, water, chalk, cotton and iron.

>

>

Chapter 1 NCERT Class 9 Science SOLUTIONS

1. The mass per unit volume of a substance is called density (density = mass/ volume). Arrange the following in order of increasing density-air, exhaust from chaimnays, honey, water, chalk, cotton and iron.

Question:

The mass per unit volume of a substance is called density (density = mass/ volume).Arrange the following in order of increasing density-air, exhaust from chimneys, honey, water, chalk, cotton and iron.

Answer:

Density of matter in order of increasing–air < exhaust from chimneys < cotton < water < honey < chalk < iron.

More NCERT Questions

Download Free PDF

(All Q's of this Chapter solved)

question pointer

Name A, B, C, D E and F in the following diagram showing change in its state.

question pointer

What Produces more severe burns, boiling water or steam.

question pointer

Why is ice at 273K more effective in cooling than water at the same temperature ?

question pointer

Give reason for confirmation— (a) Water is liquid at room temperature. (b) an iron almirah is solid at room temperature.

question pointer

What is the physical state of water at the following temperatures ? (a) 25°C (b) 0°C (c) 100°C

question pointer

Arrange the following matters according to increase of force between their particles. (a) Water (b) Sugar (c) oxygen

question pointer

Write the reasons for the following observations. (a) Naphthalene disappears with time without leaving any solid. (b) The smell of perfume reaches us even after sitting far away.

question pointer

Convert the following temperatures into Kelvin Unit. (a) 25°C (b) 373°C

question pointer

Convert the following temperatures into celsius unit— (a) 293K (b) 470K

question pointer

What type of Clothes should be wear in summer ?

question pointer

Why are we able to slip. Hot tea or milk faster from a saucer rather than a Cup?

question pointer

Why does our palm ful cold when we put some aceton or petrol or perfume on it ?

question pointer

How does the water kept in an earthen pot(matka) become cool during summer.

question pointer

Why does a desert cooler cool better on a hot dry day ?

question pointer

Suggest a method to liquify atmospheric gases.

question pointer

For any substance, why does the temperature remain. Constant during the change of state ?

question pointer

What is the physical state of water at : (a) 250ºC (b) 100ºC

question pointer

Convert the following temperature to celsius scale : (a) 300 K (b) 573 K

question pointer

Liquids generally have lower density as compared to solids. But you must have observed that ice floats on water. Find out Why?

question pointer

Give reasons : (a) A gas fills completely the vessel in which it is kept. (b) A gas exerts pressure on the walls of the container. (c) A wooden table should be called a solid. (d) We can easily move our hand in air but to do the same through a solid block of wood we need a karate expert.

question pointer

Tabulate the differences in the characteristics of states of matter. (b) Comment upon the following: Rigidity, Compressibility, fluidity, filling a gas container, shape, kinetic energy and density.

question pointer

What are the characteristics of the particles of matter?

question pointer

A diver is able to cut through water in a swimming pool. Which property of matter does this observation show ?

question pointer

The smell of hot sizzling foods reaches your several metres away, but to get the smell from cold, food, you have to go to close.

question pointer

Which of the following are matters ? Chair, air, affection, smell, hate, almond, thoughts, cold, cold drink, fragrance of perfume.

© 2026, Agrawal Group of Publications All rights reserved.