Extra 40 MCQs with answers from the chapter:2 "Is Matter Around Us Pure" for Class 9 CBSE Science:-
Multiple Choice Questions (MCQs)
1. A substance that contains only one kind of particle is called:
A) Mixture
B) Solution
C) Pure substance
D) Colloid
Answer: C) Pure substance
2. Which of the following is a pure substance?
A) Air
B) Milk
C) Iron
D) Sugar solution
Answer: C) Iron
3. What type of mixture is salt dissolved in water?
A) Heterogeneous
B) Suspension
C) Homogeneous
D) Colloid
Answer: C) Homogeneous
4. Which method is used to separate cream from milk?
A) Filtration
B) Chromatography
C) Centrifugation
D) Sublimation
Answer: C) Centrifugation
5. What is an alloy?
A) A mixture of two or more metals
B) A compound of metals
C) A pure metal
D) A mixture of a metal and non-metal
Answer: A) A mixture of two or more metals
6. Which of the following is an example of a heterogeneous mixture?
A) Sugar solution
B) Air
C) Oil and water
D) Brass
Answer: C) Oil and water
7. Which technique is used to separate a mixture of two immiscible liquids?
A) Filtration
B) Distillation
C) Chromatography
D) Separating funnel
Answer: D) Separating funnel
8. Which of the following is a colloid?
A) Salt solution
B) Air
C) Milk
D) Copper
Answer: C) Milk
9. Which separation technique is used to obtain pure water from seawater?
A) Filtration
B) Evaporation
C) Sedimentation
D) Sublimation
Answer: B) Evaporation
10. Which component of air is the most abundant?
A) Oxygen
B) Nitrogen
C) Carbon dioxide
D) Argon
Answer: B) Nitrogen
11. The Tyndall effect is observed in:
A) True solutions
B) Suspensions
C) Colloids
D) Both B and C
Answer: D) Both B and C
12. Which method is used to separate the components of ink?
A) Distillation
B) Chromatography
C) Filtration
D) Centrifugation
Answer: B) Chromatography
13. Which of the following is NOT a colloid?
A) Smoke
B) Fog
C) Sugar solution
D) Milk
Answer: C) Sugar solution
14. What type of mixture is muddy water?
A) Suspension
B) Colloid
C) Solution
D) Alloy
Answer: A) Suspension
15. A homogeneous mixture of two or more metals is called:
A) Solution
B) Colloid
C) Alloy
D) Suspension
Answer: C) Alloy
16. What is the dispersed phase in a foam?
A) Solid
B) Liquid
C) Gas
D) None of the above
Answer: C) Gas
17. A mixture that shows the Tyndall effect is:
A) True solution
B) Suspension
C) Colloid
D) Both B and C
Answer: D) Both B and C
18. Which of the following is an example of a suspension?
A) Salt solution
B) Muddy water
C) Brass
D) Milk
Answer: B) Muddy water
19. Which method is used to separate solid impurities from water?
A) Filtration
B) Distillation
C) Decantation
D) Evaporation
Answer: A) Filtration
20. What is the main principle behind distillation?
A) Difference in solubility
B) Difference in densities
C) Difference in boiling points
D) Difference in particle size
Answer: C) Difference in boiling points
21. Which of the following is a physical change?
A) Burning of wood
B) Rusting of iron
C) Melting of ice
D) Digestion of food
Answer: C) Melting of ice
22. Which of the following is a chemical change?
A) Boiling of water
B) Cutting of paper
C) Rusting of iron
D) Melting of wax
Answer: C) Rusting of iron
23. Air is a:
A) Pure substance
B) Compound
C) Homogeneous mixture
D) Heterogeneous mixture
Answer: C) Homogeneous mixture
24. What type of solution is carbonated soft drink?
A) Liquid in liquid
B) Gas in liquid
C) Solid in liquid
D) Liquid in solid
Answer: B) Gas in liquid
25. Which method is used to obtain sugar from sugarcane juice?
A) Distillation
B) Filtration
C) Evaporation
D) Crystallization
Answer: D) Crystallization
26. What is the main difference between a mixture and a compound?
A) A mixture has fixed composition
B) A compound can be separated by physical means
C) A mixture retains the properties of its components
D) A compound contains only one kind of atom
Answer: C) A mixture retains the properties of its components
27. Brass is a mixture of:
A) Copper and Iron
B) Copper and Zinc
C) Copper and Tin
D) Copper and Aluminium
Answer: B) Copper and Zinc
28. Which of the following does NOT represent a colloid?
A) Gel
B) Smoke
C) Sugar solution
D) Foam
Answer: C) Sugar solution
29. The boiling point of a pure liquid is:
A) Always constant
B) Variable
C) Lower than mixtures
D) Higher than mixtures
Answer: A) Always constant
30. Which of the following can be separated by filtration?
A) Salt solution
B) Muddy water
C) Sugar solution
D) Alcohol and water mixture
Answer: B) Muddy water
31. Which type of mixture has visible different components?
A) Homogeneous
B) Heterogeneous
C) Solution
D) Colloid
Answer: B) Heterogeneous
32. What is the solute in a sugar solution?
A) Water
B) Sugar
C) Both A and B
D) None of the above
Answer: B) Sugar
33. The method used to separate petroleum products is:
A) Filtration
B) Fractional distillation
C) Evaporation
D) Sedimentation
Answer: B) Fractional distillation
34. Smoke is an example of:
A) Solid in gas colloid
B) Gas in solid solution
C) Liquid in gas suspension
D) None of the above
Answer: A) Solid in gas colloid
35. The solubility of solids in liquids increases with:
A) Increase in temperature
B) Decrease in temperature
C) Increase in pressure
D) Decrease in pressure
Answer: A) Increase in temperature
36. A true solution is:
A) Transparent
B) Opaque
C) Translucent
D) None of the above
Answer: A) Transparent
37. Which of the following substances can undergo sublimation?
A) Sugar
B) Camphor
C) Salt
D) Sand
Answer: B) Camphor
38. The component present in a lesser amount in a solution is called:
A) Solvent
B) Solute
C) Colloid
D) Suspension
Answer: B) Solute
39. Which of the following is NOT a property of a colloid?
A) Shows Tyndall effect
B) Particles do not settle down
C) Can be separated by filtration
D) Heterogeneous in nature
Answer: C) Can be separated by filtration
40. Which separation technique is used to separate common salt from seawater?
A) Filtration
B) Chromatography
C) Evaporation
D) Distillation
Answer: C) Evaporation
