MULTIPLE CHOICE QUESTIONS:

CLASS 9 SCIENCE 2: IS MATTER AROUND US PURE MULTIPLE CHOICE QUESTIONS:
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MULTIPLE CHOICE QUESTIONS ( MCQ’s)

1. A _____________ consists of a single type of particles.

(a) Pure substances
(b) Colloid
(c) Solute
(d) Solution

2. ___________ is a solution in which the size of solute particles are bigger than that of true solution.

(a) Milk
(b) Tea
(c) Colloid
(d) Mixture

3. Which of the following will show “Tyndall Effect”?

(a) Tea
(b) Milk
(c) Suspension
(d) Colloid

4. Chalk dissolved in water is an example of ____________.

(a) Mixture
(b) Decantation
(c) Suspension 
(d) Colloid

5. Pick up the odd one out.

(a) Nitrogen
(b) Carbon dioxide
(c) Oxygen
(d) Graphite

6. The component of the solution that dissolves the other component in it is called ___________.

(a) Solution
(b) Solvent
(c) Suspension 
(d) Colloid

7. The homogeneous mixture of two or more metals or a metal and non-metal is called ____________.

(a) Alloy 
(b) Mixture
(c) Welding
(d) Amalgam

8. The amount of the solute present in the saturated solution at the given temperature is ___________.

(a) Solubility
(b) Reaction
(c) Exothermic 
(d) Saponification

9. The scattering of light by colloidal particles is called ___________.

(a) Tyndall Effect
(b) Crystallisation
(c) Suspension
(d) Solubility

10. When both the dispersed phase and dispersing medium is liquid, it is called ____________.

(a) Amalgam
(b) Suspension
(c) Dispersion
(d) Emulsion

11. Constituents combine in any ratio to form _____________.

(a) Solution
(b) Mixture
(c) Suspension
(d) Dilution

 12. ____  solution is a solution in which no more solute can further dissolve in a given temperature.

(a) Saturated 
(b) Concentrated
(c) Dilute
(d) Colourless

13. Name the technique to separate salt from sea-water.

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

14. A _____________ is a pure a pure single form of matter.

(a) Molecule
(b) Substance
(c) Atom
(d) Colloid

15. A solution in which water is a solvent is ____.

(a) Aqueous
(b) Concentrated
(c) Saturated
(d) Muddy

16. Rusting of an article made up of iron is called ____
(a) Corrosion and it is a physical as well as chemical change
(b) Dissolution and it is a physical change
(c) Corrosion and it is a chemical change
(d) Dissolution and it is a chemical change

17. A mixture of sulphur and carbon disulphide is ____
(a) Heterogeneous and shows Tyndall effect
(b) Homogeneous and shows Tyndall effect
(c) Heterogeneous and does not show Tyndall effect
(d) Homogeneous and does not show Tyndall effect

18. Tincture of iodine has antiseptic properties. This solution is
made by dissolving iodine in ___
(a) Potassium iodide
(b) Vaseline
(c) Water
(d) Alcohol

19. Which of the following are homogeneous in nature?
(i) Ice
(ii) Wood
(iii) Soil
(iv) Air
(a) (i) and (iii)
(b) (ii) and (iv)
(c) (i) and (iv)
(d) (iii) and (iv)

20. Blood and sea water are ____
(a) Both mixtures
(b) Both are compounds
(c) Blood is a mixture whereas sea water is a compound
(d) Blood is a compound and sea water is a mixture

21. Sol and gel are examples of _____
(a) Solid−solid colloids
(b) Sol is a solid−liquid colloid and gel is liquid−solid colloid
(c) Sol is solid−solid colloid and gel is solid−liquid colloid
(d) Sol is a liquid−solid colloid and gel is a solid−liquid colloid

22. In a water−sugar solution _____
(a) Water is solute and sugar is solvent
(b) Water is solvent and sugar is solute
(c) Water is solute and water is also solvent
(d) None of these

23. Boron and carbon are ____
(a) Metalloids
(b) Metalloid and non-metal respectively
(c) Metal
(d) Non−metal and metalloid respectively

24. Which of the following are physical changes?
(i) Melting of iron metal
(ii) Rusting of iron
(iii) Bending of an iron rod
(iv) Drawing a wire of iron metal
(a) (i), (ii) and (iii)
(b) (i), (ii) and (iv)
(c) (i), (iii) and (iv)
(d) (ii), (iii) and (iv)

25. Which of the following are chemical changes?
(i) Decaying of wood
(ii) Burning of wood
(iii) Sawing of wood
(iv) Hammering of a nail into a piece of wood
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (i) and (iv)

26. Which of the following methods would you use to separate cream from milk?
(a) Fractional distillation
(b) Distillation
(c) Centrifugation
(d) Filtration

27. Cooking of food and digestion of food ___
(a) Are both physical processes
(b) Are both chemical processes
(c) Cooking is physical whereas digestion is chemical
(d) Cooking is chemical whereas digestion is physical

28. Mercury and bromine are both ___
(a) Liquid at room temperature
(b) Solid at room temperature
(c) Gases at room temperature
(d) Both (a) and (b)

29. Salt we get from sea water can be purified by the _____method
(a) Fractional distillation
(b) Crystallisation
(c) Centrifugation
(d) Filtration

30. Examples of metalloids are boron, silicon, ____-

a) Bromine
b) Mercury
c) Germanium
d) None of the above

Answers:
1. (a) Pure Substances
2. (c) Colloid
3. (b) Milk
4. (b) Decantation
5. (b) Carbon dioxide
6. (c) Suspension
7.  (b) Mixture
8.  (a) Solubility
9.  (c) Suspension
10.  (b) Suspension
11. (a) Solution
12. (b)  Concentrated
13. (d) Evaporation
14. (b) Substance
15. (a) Aqueous
16. (c) Corrosion and it is a chemical change
17.(d) Homogeneous and does not show Tyndall effect
18.(d) Iodine in alcohol
19.(c) (i) and (iv)
20.(a) Both mixtures
21.(b) Sol is a solid-liquid colloid and gel is liquid solid colloid
22.b) Water is solvent and sugar is solute
23.(b) Metalloid and non-metal respectively
24.(c) (i), (iii) and (iv)
25.(a) (i) and (ii)
26.(c) Centrifugation
27.(b) Are both chemical processes
28.a) Liquid at room temperature
29.(b) Crystallisation
30.(c) Germanium

 
 
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