1. What is the chemical formula of water?
a) H2O2
b) H3O
c) H2O
d) HO
Answer: c) H2O
2. What is the angle between the two hydrogen atoms in a water molecule?
a) 90 degrees
b) 105 degrees
c) 120 degrees
d) 180 degrees
Answer: b) 105 degrees
3. Which of the following statements about water is true?
a) Water is a non-polar molecule
b) Water is a universal solvent
c) Water has a low heat capacity
d) Water has a high density as a solid
Answer: b) Water is a universal solvent
4. What property of water allows it to form hydrogen bonds?
a) High surface tension
b) Polar covalent bonding
c) Low heat capacity
d) Low boiling point
Answer: b) Polar covalent bonding
5. Which of the following is NOT a property of water?
a) Adhesion
b) Cohesion
c) Evaporation
d) Sublimation
Answer: d) Sublimation
6. What term describes the ability of water to stick to surfaces?
a) Cohesion
b) Adhesion
c) Surface tension
d) Capillarity
Answer: b) Adhesion
7. What property of water allows insects like water striders to walk on its surface?
a) Cohesion
b) Adhesion
c) Surface tension
d) Capillarity
Answer: c) Surface tension
8. Which of the following statements about water’s density is true?
a) Water is most dense as a gas
b) Water is least dense as a solid
c) Water is most dense as a liquid
d) Water has the same density in all states
Answer: c) Water is most dense as a liquid
9. What is the specific heat capacity of water?
a) 1 cal/g°C
b) 2 cal/g°C
c) 4 cal/g°C
d) 8 cal/g°C
Answer: c) 4 cal/g°C
10. Which of the following statements about water’s heat capacity is true?
a) Water has a low heat capacity
b) Water has a high heat capacity
c) Water’s heat capacity decreases with temperature
d) Water’s heat capacity is independent of pressure
Answer: b) Water has a high heat capacity
11. What is the freezing point of water in degrees Celsius?
a) 0°C
b) 32°C
c) -273°C
d) -20°C
Answer: a) 0°C
12. What term describes the process by which water changes from a liquid to a gas?
a) Freezing
b) Condensation
c) Evaporation
d) Sublimation
Answer: c) Evaporation
13. Which of the following substances has a higher density than water?
a) Ice
b) Oil
c) Alcohol
d) Mercury
Answer: d) Mercury
14. What is the pH of pure water at room temperature?
a) 0
b) 7
c) 10
d) 14
Answer: b) 7
15. What term describes the ability of water to dissolve other substances?
a) Solubility
b) Cohesion
c) Adhesion
d) Dissolution
Answer: d) Dissolution
16. What is the term for the maximum amount of solute that can dissolve in a given amount of solvent at a specific temperature?
a) Saturation
b) Concentration
c) Dilution
d) Solubility
Answer: d) Solubility
17. What property of water allows it to form a meniscus in a narrow tube?
a) Adhesion
b) Cohesion
c) Surface tension
d) Capillarity
Answer: d) Capillarity
18. What term describes the process by which water molecules move from an area of higher concentration to an area of lower concentration through a semi-permeable membrane?
a) Osmosis
b) Diffusion
c) Filtration
d) Evaporation
Answer: a) Osmosis
19. What is the term for the process by which water vapor condenses into liquid water?
a) Evaporation
b) Condensation
c) Precipitation
d) Sublimation
Answer: b) Condensation
20. What term describes the maximum amount of water vapor that can be present in the air at a given temperature?
a) Humidity
b) Vapor pressure
c) Dew point
d) Saturation
Answer: d) Saturation