Is matter pure around us? medium

Is Matter Pure Around Us? Quiz (Medium)

1. Which of the following is a physical change?

a) Burning of paper b) Rusting of iron c) Dissolving sugar in water d) Photosynthesis

2. A solution is prepared by dissolving 10g of salt in 100g of water. What is the mass percentage of salt in the solution?

a) 10% b) 20% c) 9% d) 11%

3. The process of separation of components from a liquid mixture based on the difference in boiling points is called:

a) Filtration b) Evaporation c) Distillation d) Sublimation

4. Which of the following is a homogeneous mixture?

a) Soil b) Vinegar c) Sand and water d) Milk

5. The process of conversion of a solid directly into vapor without passing through the liquid state is called:

a) Filtration b) Decantation c) Sublimation d) Evaporation

6. Which method is used to separate a mixture of two immiscible liquids?

a) Filtration b) Decantation c) Centrifugation d) Distillation

7. Which of the following is a pure substance?

a) Air b) Milk c) Water d) Soil

8. Which method is used to separate a mixture of two miscible liquids with different boiling points?

a) Filtration b) Decantation c) Sublimation d) Distillation

9. Which of the following is a chemical change?

a) Freezing of water b) Boiling of water c) Melting of ice d) Dissolving salt in water

10. The process of separation of a mixture of two or more solids of different sizes by shaking it with a sieve is called:

a) Filtration b) Evaporation c) Decantation d) Sieving