Class 9 Science – Chapter: Exploring Mixtures and Separation
20 MCQs (Without Answers)
1. A mixture is: A. A pure substance
B. A combination of two or more substances without chemical change
C. A compound with fixed composition
D. An element
2. Which of the following is a homogeneous mixture?
A. Sand and water
B. Oil and water
C. Salt solution
D. Soil
3. Which of the following is a heterogeneous mixture?
A. Air
B. Sugar solution
C. Brass
D. Sand and water
4. Which method is best suited to separate an insoluble solid from a liquid?
A. Evaporation
B. Filtration
C. Distillation
D. Chromatography
5. Which process is used to obtain common salt from seawater?
A. Filtration
B. Sublimation
C. Evaporation
D. Sedimentation
6. Which method is used to separate cream from milk?
A. Filtration
B. Centrifugation
C. Decantation
D. Sieving
7. Which of the following substances undergoes sublimation?
A. Sand
B. Common salt
C. Ammonium chloride
D. Iron filings
8. Which method is used to separate iron filings from sand?
A. Filtration
B. Magnetic separation
C. Winnowing
D. Sedimentation
9. Which property is mainly used in chromatography?
A. Magnetism
B. Difference in solubility and adsorption
C. Size of particles
D. Density
10. Which technique is used to separate alcohol from water?
A. Filtration
B. Distillation
C. Sieving
D. Handpicking
11. Decantation is based on the difference in:
A. Colour
B. Density
C. Shape
D. Temperature
12. Which method is commonly used to separate husk from grains?
A. Filtration
B. Winnowing
C. Distillation
D. Sublimation
13. The process of allowing heavier particles to settle at the bottom is called:
A. Evaporation
B. Sedimentation
C. Condensation
D. Distillation
14. Which of the following is a pure substance?
A. Milk
B. Air
C. Distilled water
D. Soil
15. Which method is used to separate different coloured pigments in ink?
A. Sieving
B. Chromatography
C. Distillation
D. Magnetic separation
16. Which of the following is an example of an alloy?
A. Air
B. Brass
C. Salt solution
D. Sugar solution
17. Which method is suitable for separating stones from rice?
A. Handpicking
B. Distillation
C. Evaporation
D. Filtration
18. The process of converting a liquid into vapour and then back into liquid is called:
A. Sublimation
B. Distillation
C. Sedimentation
D. Sieving
19. Which factor is most important in choosing a separation technique?
A. Colour of the substances
B. Physical properties of the components
C. Cost of the mixture
D. Taste of the substances
20. Which of the following metho
ds is based on the difference in boiling points?
A. Filtration
B. Distillation
C. Magnetic separation
D. Handpicking