Time Left:
600
sec
1. A suspension is—
A. Homogeneous mixture
B. Heterogeneous mixture with visible particles
C. Compound
D. Colloid
2. Suspension particles—
A. Are invisible
B. Are stable and never settle
C. Settle on standing
D. Cannot be filtered
3. Which mixture scatters light?
A. Solution
B. Suspension
C. Colloid
D. Both B and C
4. The scattering of light by colloidal particles is known as—
A. Brownian motion
B. Diffusion
C. Tyndall effect
D. Reflection
5. Which will show Tyndall effect in sunlight?
A. Air
B. Fog
C. Salt solution
D. Sugar solution
6. A colloid appears—
A. Completely transparent
B. Opaque and unstable
C. Homogeneous but is actually heterogeneous
D. Solid only
7. The solute-like component in a colloid is called—
A. Dispersing medium
B. Dispersed phase
C. Solvent
D. Mixture
8. The medium in which the dispersed phase is suspended is called—
A. Solvent
B. Solution
C. Dispersing medium
D. Precipitate
9. What is the dispersed phase and medium in milk?
A. Fat and water
B. Water and fat
C. Water and protein
D. Fat and sugar
10. Which technique separates colloidal particles?
A. Filtration
B. Centrifugation
C. Evaporation
D. Distillation
11. The path of a light beam becomes visible in—
A. Solution
B. Suspension
C. Colloid
D. Both B and C
12. Burning of paper is a—
A. Physical change
B. Chemical change
C. Both
D. Temporary change
13. Melting of butter is—
A. Physical change
B. Chemical change
C. Both
D. None
14. Rusting of iron is—
A. Physical change
B. Chemical change
C. Temporary change
D. None
15. Which of the following is a pure substance?
A. Milk
B. Soil
C. Iron
D. Air
16. Element is defined as—
A. Substance made of two elements
B. Pure substance that cannot be broken down chemically
C. Homogeneous mixture
D. Heterogeneous mixture
17. Which of the following is a metal?
A. Carbon
B. Oxygen
C. Iron
D. Bromine
18. Which of the following is non-metal?
A. Silver
B. Copper
C. Iodine
D. Zinc
19. Which is liquid metal at room temperature?
A. Sodium
B. Mercury
C. Aluminium
D. Lead
20. Bromine at room temperature is—
A. Solid metal
B. Gas
C. Liquid non-metal
D. Solid metalloid
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