Separation of substances Worksheet-12

Separation of substances Worksheet-12

Multiple-Choice Question:

11. What is true about the process of filtration?

(A) The particles of the insoluble solid must be smaller than the holes in the filtering device.

(B) The particles of the insoluble solid must be bigger than the holes in the filtering device.

(C) The particles of the insoluble solid must be very small than the holes in the filtering device.

12. Which of the following acts as a filtering device in the process of filtration?

(A) Filter paper   (B) Filter plate     (C) Filter bowl

13. Seawater has salt dissolved in it. By which process we can obtain the salt from seawater?

(A) Condensation

(B) Sedimentation

(C) Evaporation

14. This is considered as the last step for obtaining salt from seawater. After this step only, salt is ready for consumption.

(A) Purification   (B) Evaporation   (C) Condensation

15. The process of change of _____ into _____ state is termed as evaporation.

(A) Gaseous, liquid

(B) Liquid, gaseous

(C) Solid, liquid

16. Which statement is true about the change in physical state?

(A) Condensation is the opposite of evaporation.

(B) Filtration is the opposite of condensation.

(C) Evaporation is the opposite of decantation.

17. What is formed when water vapour in the air condenses into liquid state?

(A) Dew               (B) Fog                 (C) Smog

18. The process of change of ______ into ______ state is called condensation.

(A) Gaseous, liquid

(B) Liquid, gaseous

(C) Solid, liquid

Answer key:

11. (B)
12. (A)
13. (C)
14. (A)
15. (B)
16. (A)
17. (C)
18. (A)