Matter in our surrounding class 9 Ncert viedo solution
Full question analysis
2. Give reasons for the following observation
The smell of hot sizzling food reaches you several metres away, but to get the smell
from cold food you have to go close.
3. A diver is able to cut through water in a swimming pool. Which property of matter
does this observation show?
4. What are the characteristics of the particles of matter?
5. 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.
Ncert Viedo solution.
6.(a) Tabulate the differences in the characterisitcs of states of matter.
(b) Comment upon the following rigidity, compressibility, fluidity, filling a gas
container, shape, kinetic energy and density.
7. 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
8. Liquids generally have lower density as compared to solids. But you must have
observed that ice floats on water. Find out why.
9. Convert the following temperature to celsius scale:
a. 300 K b. 573 K.
10. What is the physical state of water at:
a. 250o
C b. 100o
C ?
11. For any substance, why does the temperature remain constant during the
change of state?
12. Suggest a method to liquefy atmospheric gases.
13. Why does a desert cooler cool better on a hot dry day?
14. How does the water kept in an earthen pot (matka) become cool during
summer?
15. Why does our palm feel cold when we put some acetone or petrol or perfume on
it?
16. Why are we able to sip hot tea or milk faster from a saucer rather than a cup?
17. What type of clothes should we wear in summer?
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