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MCQ Questions for Class 9 Science: Ch 2 Is Matter Around Us Pure

MCQ Questions for Class 9 Science: Ch 2 Is Matter Around Us Pure

1. Name the mixture whose particles are large enough to scatter light.
(a) Colloid
(b) True solutions
(c) Homogeneous solution
(d) All of the above
► (a) Colloid

2. Which of the following property does not describe a compound?
(a) It is composed of two or more elements
(b) It is a pure substance.
(c) It cannot be separated into constituents by physical means
(d) It is mixed in any proportion by mass
► (d) It is mixed in any proportion by mass

3. The components of a solution are:
(a) Dispersed particles and solvent
(b) Solute and solvent
(c) Dispersed phase and dispersion medium
(d) Solute and dispersed medium
► (b) Solute and solvent

4. The smell of hydrogen sulphide (H2S) gas
(a) pleasant
(b) of rotten egg
(c) of burning sulphur
(d) None of these
► (b) of rotten egg

5. Which of the following substances will not dissolve in water?
(a) Sugar
(b) Sodium chloride
(c) Copper sulphate
(d) Carbon
► (d) Carbon

6. What is the principle behind the process of centrifugation?
(a) Particles are separated based on the difference in colour.
(b) Denser particles are forced to the bottom and lighter particles stay at the top when spun rapidly.
(c) Lighter particles are forced to the bottom and denser particles stay at the top when spun rapidly.
(d) Particles are separated based on the difference in temperature.
► (b) Denser particles are forced to the bottom and lighter particles stay at the top when spun rapidly.

7. What will you observe when a mixture of iodine and salt is heated in a china dish?
(a) No change in the china dish is observed.
(b) Salt is left behind in the china dish.
(c) Iodine is left behind in the china dish.
(d) The mixture starts melting.
► (b) Salt is left behind in the china dish.

8. An example of a liquid metal and a liquid non-metal is 
(a) gallium, mercury
(b) mercury, chlorine
(c) mercury, bromine
(d) bromine, sulphur
► (c) mercury, bromine

9. Which technique is used in diagnostic laboratories for blood and urine test?
(a) Sublimation
(b) Centrifugation
(c) Evaporation
(d) Magnetic separation
► (b) Centrifugation

10. Which method is used to separate cream from milk?
(a) Centrifugation
(b) Adsorption
(c) Distillation
(d) Crystallization
► (a) Centrifugation

11. Which of the following is a chemical change? 
(a) Melting of wax 
(b) Mixing of iron filings with sulphur powder 
(c) Cooking of food 
(d) Dissolving salt in water
► (c) Cooking of food 

12. The continuous zig-zag movement of colloidal particles in a dispersion medium is called
(a) Dispersion
(b) Tyndall effect
(c) Brownian movement
(d) Oscillation
► (c) Brownian movement

13. A change of state from one form to another is a
(a) physical change
(b) chemical change
(c) biological change
(d) state variation
► (a) physical change

14. The formation of water from oxygen and hydrogen is a _______ .
(a) Physical change
(b) Chemical change
(c) Reversible change
(d) Both Physical and Reversible change
► (b) Chemical change

15. What do you understand by the term concentrated solution?
(a) Solution containing no solute
(b) Solution with low solute concentration
(c) Solution in which no more solute can be dissolved
(d) Solution with high solute concentration
► (d) Solution with high solute concentration

16. The clear liquid which is left behind in the beaker after settling down of the sediments is called:
(a) Solvent
(b) Supernatant liquid
(c) Solution
(d) Sediment
► (b) Supernatant liquid

17. Which of the following parameters of a substance does not alter during a physical change?
(a) State
(b) Mass
(c) Volume
(d) Size
► (b) Mass

18. Which of the following statements is incorrect about physical changes?
(a) There is no gain or loss of energy.
(b) It is permanent and irreversible.
(c) Composition of the substance remains same.
(d) No new substance is formed.
► (b) It is permanent and irreversible.

19. A colloid with a solid dispersed phase and liquid dispersing medium is called:
(a) Foam
(b) Gel
(c) Sol
(d) Emulsion
► (c) Sol

20. Which technique is used to separate blood cells from plasma?
(a) Evaporation
(b) Sublimation
(c) Centrifugation
(d) Filtration
► (c) Centrifugation

21. A solution in which no more solute can be dissolved at a given temperature is known as:
(a) Unsaturated solution
(b) True solution
(c) Dilute solution
(d) Saturated solution
► (d) Saturated solution

22. Which of the following apparatus is not required in sublimation?
(a) Condenser
(b) Funnel
(c) China dish
(d) Wire gauze
► (a) Condenser

23. Which of the following method can be used to separate a mixture of camphor and sugar?
(a) Sublimation
(b) Filtration
(c) Distillation
(d) Crystallisation
► (a) Sublimation

24. The process of separation of insoluble solids from a liquid is called:
(a) Filtration
(b) Decantation 
(c) Crystallisation 
(d) Evaporation
► (a) Filtration

25. If a solution contains 60g of common salt in 340g of water, the mass by mass percentage will be:
(a) 25 %
(b) 15 %
(c) 20 %
(d) 17.6 %
► (b) 15 %

26. During sublimation of ammonium chloride, pure ammonium chloride gets:
(a) Liquefies to form a solution
(b) Collected on outer sides of the funnel
(c) Collected on inner sides of the china dish
(d) Collected on inner sides of the funnel
► (d) Collected on inner sides of the funnel

27. What type of change takes place when a sodium hydroxide pellet is added to water?
(a) Reversible change
(b) Reversible chemical change
(c) Physical change
(d) Chemical change
► (d) Chemical change

28. During filtration, the solid that remains on the filter paper is called:
(a) Solute
(b) Residue
(c) Solvent
(d) Filtrate
► (b) Residue

29. Which of the following has the highest solubility at 313 K? 
(a) KNO3 
(b) NaCl 
(c) KCl
(d) NH4Cl
► (a) KNO3 

30. A chemical reaction involves in
(a) Only breaking of bonds
(b) Only formation of bonds
(c) Both breaking and formation of bonds
(d) None of these
► (c) Both breaking and formation of bonds

31. Which of the following colloid is a gel?
(a) Fog
(b) jellies
(c) Milk
(d) Smoke
► (b) jellies

32. What is the use of sedimentation tank in water purification system?
(a) To separate out the insoluble substances from water.
(b) To separate out very small suspended particles from water.
(c) To kill the germs present in water.
(d) All of the above.
► (a) To separate out the insoluble substances from water.

33. Which of the following statement is true for colloids?
(a) Colloid is a homogeneous mixture.
(b) Particles of a colloid can be seen by naked eye.
(c) Particles of colloid scatter a beam of light passing through it.
(d) All of these
► (c) Particles of colloid scatter a beam of light passing through it.

34. Which of the following is not a mixture? 
(a) Soap solution
(b) Blood
(c) Carbon dioxide
(d) Coal
► (c) Carbon dioxide

35. What type of mixture is obtained on continuous stirring when we add one spoon of sugar to water?
(a) Homogeneous mixture
(b) Colloid
(c) Suspension
(d) Heterogeneous mixture
► (a) Homogeneous mixture

36. Which of the following is a true solution? 
(a) Milk 
(b) Chalk powder in water 
(c) Salt solution 
(d) Blood
► (c) Salt solution 

37. Most paints are:
(a) Gels
(b) Suspensions
(c) Emulsions
(d) Sols
► (d) Sols

38. Which is the best technique to separate coffee grains from coffee solution?
(a) Distillation
(b) Evaporation
(c) Filtration
(d) Chromatography
► (c) Filtration
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