Physics Chapter - 1 Work Sheet

Dear students of class 6(2) you are requested to write the answer for the following assignments in your Physics Exercise copy.

Chapter 1 – Matter

        A.   Answer the following questions:

       1) Define matter. What is its composition?

       2)    Name three states of matter.

       3) What is molecule?

       4)    What is the approximate size of a molecule?

       5)    One litre of water has 6.02 x 10²⁶ molecules. Estimate the size of a molecule.

       6)    Define:

i)                   Inter molecular space

ii)                Inter molecular force

iii)              Force of cohesion

iv)              Force of adhesion

       7) State three characteristics of molecules of matter which determine its solid, liquid        and gaseous state.

       8)   State the approximate spacing between two molecules of a matter.

       9)    How do solids, liquids and gases differ in their following  properties:

i)                   Size                     ii) Shape         iii) Density         iv) Fluidity

v)                Compressibility   vi) Expansion on heating

10)  The molecules in a substance are in motion. What type of path do they follow?

11) Write down five properties of solids, liquids and gases.

12) What do you mean by change of state of matter?

13) What is melting? At what temperature ice starts melting?

14) What is boiling? What is the boiling point of water?

15) Give the molecular model for a solid and use it to explain why solid has a definite shape and definite volume. 

16) Give the molecular model for a liquid and use it to explain why solid has no  definite shape , but has a definite volume.

17) Give the molecular model for a gas and use it to explain why gas has neither a definite shape nor has a definite volume.

B. Fill in the blanks:

i) All the molecules of a substances are ___________ .

ii) The intermolecular spacing is ______ in solids __________ in liquids and

____________ in gases.

iii) The molecular motion in liquid and gas in ____________ path.

iv) In a solid, the molecules _____________ on either side but they remain at their fixed positions.

v) The intermolecular forces are the weakest in ____________ .

vi) A solid exert pressure __________ .

vii) The gases are ____________ dense.

viii) A solid is ____________ rigid.

ix) ___________  and ________ are called fluids.

x) __________ is the fourth state of matter.