Time Left:
600
sec
1. What is a pure substance according to scientists?
A. A mixture with no impurities
B. A material made up of only one kind of particles
C. A combination of many elements
D. Any natural material
2. Which of the following is a mixture?
A. Sodium chloride
B. Water
C. Milk
D. Iron
3. Mixtures that have uniform composition throughout are called—
A. Heterogeneous mixtures
B. Solutions
C. Homogeneous mixtures
D. Colloids
4. Mixtures having non-uniform composition are called—
A. Homogeneous mixtures
B. Heterogeneous mixtures
C. Solutions
D. Compounds
5. Which one is a homogeneous mixture?
A. Salt and iron filings
B. Oil and water
C. Sugar dissolved in water
D. Sand and salt
6. What kind of mixture is soil?
A. Compound
B. Element
C. Homogeneous mixture
D. Heterogeneous mixture
7. A solution is a—
A. Heterogeneous mixture
B. Homogeneous mixture
C. Compound
D. Element
8. In a solution, the component present in larger amount is called—
A. Solute
B. Solvent
C. Solid
D. Colloid
9. Which of these is the solute in lemonade?
A. Water
B. Sugar and salt
C. Lemon juice only
D. Ice
10. Air is a—
A. Compound
B. Heterogeneous mixture
C. Homogeneous mixture of gases
D. Pure substance
11. Brass is a mixture of—
A. Copper and tin
B. Zinc and copper
C. Iron and carbon
D. Silver and gold
12. Which is the solute in tincture of iodine?
A. Iodine
B. Alcohol
C. Water
D. Air
13. Which solution has gas dissolved in liquid?
A. Air
B. Soda water
C. Alloy
D. Milk
14. In a solution, solute particles—
A. Can be seen by naked eyes
B. Settle down on standing
C. Cannot be seen and are evenly distributed
D. Scatter light
15. The size of particles in a solution is—
A. More than 1 mm
B. Between 1 nm and 1 mm
C. Smaller than 1 nm
D. Larger than 10 nm
16. Which of the following will not show Tyndall effect?
A. Milk
B. Starch solution
C. Copper sulphate solution
D. Fog
17. What is a saturated solution?
A. Solution with more solute
B. Solution that cannot dissolve more solute at given temperature
C. Solution with little solute
D. Solution cooled rapidly
18. The amount of solute dissolved in 100 g of solvent at a given temperature is called—
A. Concentration
B. Solubility
C. Composition
D. Density
19. A solution with less solute than saturation level is—
A. Concentrated
B. Dilute
C. Unsaturated
D. Colloidal
20. Which term refers to the amount of solute in a given mass or volume of solution?
A. Solubility
B. Concentration
C. Density
D. Diffusion
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