Which of the following is a characteristic of distilled water?
a) Contains dissolved minerals
b) Free of contaminants
c) High pH
d) High salt content
Answer: b) Free of contaminants
The phenomenon of water rising through narrow tubes or spaces against gravity is known as:
a) Capillary action
b) Osmosis
c) Diffusion
d) Adhesion
Answer: a) Capillary action
What is the term for water that contains high levels of dissolved calcium and magnesium?
a) Soft water
b) Distilled water
c) Hard water
d) Deionized water
Answer: c) Hard water
Which of the following processes is not part of the water cycle?
a) Condensation
b) Precipitation
c) Combustion
d) Evaporation
Answer: c) Combustion
Which of the following elements is essential for water purification in ecosystems?
a) Oxygen
b) Nitrogen
c) Phosphorus
d) Carbon
Answer: a) Oxygen
The addition of chlorine to water is primarily for:
a) Removing sediments
b) Killing bacteria and viruses
c) Enhancing taste
d) Reducing hardness
Answer: b) Killing bacteria and viruses
Which of the following is a common indicator of water pollution?
a) High oxygen levels
b) Presence of coliform bacteria
c) Low TDS
d) Neutral pH
Answer: b) Presence of coliform bacteria
What is the main purpose of a septic tank?
a) Filtering water
b) Storing water
c) Treating wastewater
d) Measuring water quality
Answer: c) Treating wastewater
What is the primary source of water for most inland rivers?
a) Groundwater
b) Glaciers
c) Rainfall
d) Oceans
Answer: c) Rainfall
What type of bond holds the hydrogen and oxygen atoms together in a water molecule?
a) Ionic bond
b) Covalent bond
c) Metallic bond
d) Hydrogen bond
Answer: b) Covalent bond
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