1. When pressure is applied to a system containing water and ice at 0°C, the result is:
a) More ice is converted to water
b) No significant change occurs
c) Water changes into vapor
d) More ice is formed
Answer: a
2. In water purification, muddy water is treated with alum in a process called:
a) Coagulation
b) Absorption
c) Emulsification
d) Adsorption
Answer: a
3. Which of the following is commonly used to purify muddy water?
a) Common salt
b) Potash salt
c) Aluminium powder
d) Bleaching powder
Answer: c
4. Alum helps stop bleeding from small cuts because of its property of:
a) Salvation
b) Emulsification
c) Dialysis
d) Coagulation
Answer: d
5. Milk is an example of:
a) Emulsion
b) Suspension
c) Gel
d) Sol
Answer: a
6. Which is the strongest coagulant among the following?
a) Zinc chloride
b) Aluminium chloride
c) Barium chloride
d) Magnesium sulphate
Answer: b
7. What happens to a bowl containing ice and water at exactly 0°C?
a) All ice melts
b) All water freezes
c) No change occurs
d) Some ice melts
Answer: c
8. A eudiometer is used to measure:
a) Atmospheric pressure
b) Time
c) Volume of gas
d) Vapour pressure
Answer: c
9. The enzyme responsible for coagulating milk into curd is:
a) Rennin
b) Pepsin
c) Regin
d) Citrate
Answer: a
10. Alum is used in water treatment by the process of:
a) Coagulation
b) Peptization
c) Softening
d) Electro-osmosis
Answer: a
11. Which of the following is not a donor atom?
a) Phosphorus
b) Antimony
c) Arsenic
d) Aluminium
Answer: d
12. An example of a solid sol is:
a) Milk of magnesia
b) Foam
c) Coloured gemstones
d) Rubber
Answer: c
13. The direct transformation of a solid into a gas is called:
a) Evaporation
b) Condensation
c) Sublimation
d) Distillation
Answer: c
14. The process of converting a gas into a liquid is called:
a) Condensation
b) Evaporation
c) Deposition
d) Sublimation
Answer: a
15. Clouds are colloids of:
a) Air in water
b) Fog in water
c) Mist in air
d) Water droplets in air
Answer: d
16. Good electrical conductors have many free:
a) Protons
b) Neutrons
c) Atoms
d) Electrons
Answer: d
17. Rechargeable cells store which type of energy?
a) Electrical energy
b) Potential energy
c) Kinetic energy
d) Chemical energy
Answer: d
18. Materials commonly used in rechargeable batteries (like torch lights, electric shavers) are:
a) Iron and Cadmium
b) Nickel and Cadmium
c) Lead and Lead peroxide
d) Zinc and Carbon
Answer: b
19. Catalysts are substances that:
a) Increase the rate of a reaction
b) Decrease the rate of a reaction
c) Have no effect on the rate of a reaction
d) Are consumed during the reaction
Answer: a
20. Which of the following is an example of an aerosol?
a) Milk
b) River water
c) Smoke
d) Blood
Answer: c
21. When hydrogen gas expands from a high-pressure to low-pressure region, its temperature:
a) Slightly decreases
b) Increases
c) Remains unchanged
d) Drops suddenly
Answer: b
22. Which of the following is not a crystalline solid?
a) Salt
b) Sugar
c) Copper sulphate
d) Rubber
Answer: d
23. Light scattering occurs in:
a) Colloidal solutions
b) Acidic solutions
c) Basic solutions
d) Electrolytic solutions
Answer: a