Chemistry Guess Questions Banks :Matter in Our Surroundings

Chemistry Adda Class IX, Chemistry  Guess Questions Banks

Chapter 1: Matter in Our Surroundings

1.      What are the different states of matter? Why do matter exist in these different states? [2]

2.      Why is ice at 273k is more effective in cooling than water at same temperature? [2]

3.      Give reasons. a. Naphthalene balls disappear with time without leaving any residue.

4.      b. We can get the smell of perfume sitting several meters away [2]

5.      What is the physical state of water at a)30oC b)0oC c)100oC

6.      What type of clothes should we wear in summer? [2]

7.      How does the water kept in an earthen pot (matka) become cool during summer? [2]

8.      Why are we able to sip hot tea or milk faster from a saucer rather than a cup? [2]

9.      Why does a desert cooler cool better on a hot dry day? [2]

10.  For any substance, why does the temperature remain constant during its phase change?[2]

11.  What is sublimation? [2]

12.  Give reasons for - [3] The smell of hot sizzling food reaches you several meters away, but to get the smell from cold food you have to go close.

13.  Give reasons for : How does evaporation cause cooling? [3]

14.  Explain giving an activity that the liquids differ in their relative diffusion rates [3]

15.  Differentiate between evaporation & boiling. [3]

16.  Give two reasons to justify. (a) Water at room temperature is a liquid (b) An iron almirah is a solid at room temperature. [3]

17.  Give reasons- [3]

(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.

18.  What are the characteristics of the particles of matter? [3]

19.  A diver is able to cut through water in a swimming pool. Which property of matter does this observation prove? [3]

20.  What will happen if we put an animal cell or a plant cell into a solution of sugar or salt in water? [3]

21.  Define the following terms.

Fusion, latent heat of fusion, boiling point, latent heat of vaporization and sublimation. [3]