We should wear cotton and white or light colored clothes in summer because cotton cloth absorbs more sweat and white or light coloured clothes are good reflectors of heat by due to which we feel cold....

What type of Clothes should be wear in summer ?

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

What Produces more severe burns, boiling water or steam.

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

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

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

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

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.

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

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

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

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

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

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

Suggest a method to liquify atmospheric gases.

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

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

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

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

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.

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.

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.

What are the characteristics of the particles of matter?

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

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.

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

Chapter 1 NCERT Class 9 Science SOLUTIONS

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