One Mark Questions:-

 1. Define Condensation.

 2. What do you mean by constituents of the mixture?

 3. Name the following:
     (a) The machine used in big fields for threshing.
     (b) The clear liquid obtain

 4.Name two methods by which an insoluble solid can be separated from a liquid.

 5.Label the following.


 6.What is sieving?

 7.What is separation?

 8.Name the methods by which the following components are separated.
     (a) Wheat bran from flour  
     (b) Grains from husk

 9.What is suspension?

 10. Why do we call sea water a mixture?

 11.What do you mean by filtration?

 12.Name the following:
     (a) The clear liquid collected above the sediment. 
     (b) The method used to separate the particles of different size

 13.Why do we need pure substances?

 14.Why do mustard oil and petrol not mix with water?

 15.Give 2 factors that increase the solubility of a Substance.

16. What is rolling?

17. What is filtrate?

18. Name the method of separation used at home.
                a) Making of cottage paneer
                b) for separating pebbles from pulses."

19. Identify the method of separation employed in 1) Winnowing  2) Mixing sand in water



20. Define evaporation.

 Two Mark Questions:-
1.What do you understand by supersaturated solution? Give one example.

2.What principle do we use in the separation of mixtures?

3.What are pure substances?

4.What is the importance of a thresher to a farmer?

5.What is filtration? How is it useful to us? 

6.For what purpose filtration technique is used? Give one example.

7.Define solubility.

8.What properties would you look for to prove whether a particular substance is pure or impure?

9.Identify the method of separation employed in the following picture and write one sentence about it.

10.What do you understand by supersaturated solution? Give an example.

11.What is brine solution and what do you observe on heating it?

12. What is the importance of thresher to a farmer?

Three Mark Questions:-

1.How will you separate sugar and chalk powder?

 2.What is the standard unit of length? What is standard metre rod and and where is it kept? In India who is responsible for maintaining such standards?

 3.What do you understand by solution? Explain it in terms of solute ans solvent.

 4.How will you separate a mixture of common salt, sand and iron fillings?

 5.What is threshing? and how is it done?