CBSE Class 9 - Science - CH2 - Is Matter Around Us Pure? (MCQs)

Is Matter Around Us Pure?

MCQs Based on Class 9 Science NCERT Book Chapter 2

Q1: Which of the following is NOT true about colloids?

(a) Particles in a colloid can pass through filter paper.
(b) A colloid is a homogeneous solution.
(c) Colloidal particles exhibit Brownian motion.
(d) Colloidal particles exhibit electrophoresis.



Q2: Which of the following is a heterogeneous mixture?

(a) air
(b) brass
(c) sugar dissolved in water
(d) lime water



Q3: How can we separate cream from milk?

(a) Centrifugation
(b) Chromatography
(c) Sublimation
(d) Distillation





Q4: Removal of clear layer of the liquid without disturbing the settled solid is known as __________.

(a) Sedimentation
(b) Decantation
(c) Filtration
(d) Evaporation



Q5: A mixture of water and silver chloride can be separated by

(a) Centrifugation
(b) Sedimentation
(c) Filtration
(d) Sublimation


Q6: When two liquids in a mixture differ by their boiling points, which of the following is the best method to separate these liquids?

(a) Evaporation
(b) Distillation
(c) Chromatography
(d) Filtration



Q7: Solution which has uniform composition throughout is called ___________.

(a) homogeneous solution
(b) heterogeneous solution
(c) Colloidal solution
(d) none of these



Q8: The particles of a suspension will be of size ________

(a) less than 1nm (nm = nano metre)
(b) between 1nm to 100 nm
(c) greater than 100nm
(d) less than 0.1 nm



Q9: Which of the following is a chemical change?

(a) Melting of ice
(b) Dissolving salt in water
(c) Rusting of iron
(d) Boiling of water into steam



Q10: Which one of the following is TRUE for compounds?

(a) It shows properties of its constituents.
(b) It may be homogeneous or heterogeneous.
(c) It can be separated by physical methods.
(d) It has fixed melting and boiling point.


✌ See Also Is Matter Around Us Pure (Q & A)


Answers:
1: (b) A colloid is a homogeneous solution. (False)
2: (d) lime water
3: (a) Centrifugation
4: (b) Decantation
5: (c) Filtration
6: (b) Distillation
7: (a) homogeneous solution
8: (c) greater than 100nm
9: (c) Rusting of iron
10: (d) It has fixed melting and boiling point.