Basic Science 1b

Which of the following elements is represented by the symbol "Cl"?

• Carbon

• Chlorine

• Chlorine

• Copper

What is the chemical formula for common table salt?

• NaCl

• H₂O

• CO₂

• HCl

Which of the following is a compound made up of hydrogen and oxygen?

• Hydrogen gas

• Water

• Oxygen gas

• Nitrogen

What is pollution?

• The process of cleaning the environment

• The addition of harmful substances to the environment

• The process of planting trees

• The recycling of waste materials

Which of the following is a type of pollution?

• Air pollution

• Water pollution

• Land pollution

• All of the above

Which of these is a major cause of water pollution?

• Cutting down trees

• Dumping of waste into rivers

• Planting flowers

• Recycling plastic bottles

What is one effect of water pollution on human health?

• It helps improve digestion

• It can cause waterborne diseases

• It can reduce skin infections

• It increases oxygen supply

How can water pollution be prevented?

• By using more pesticides

• By dumping waste into water bodies

• By treating industrial waste before disposal

• By increasing fishing activities

Which of these is NOT a common cause of air pollution?

• Exhaust fumes from vehicles

• Smoke from factories

• Planting trees

• Burning of coal

What is the effect of water pollution on aquatic life?

• It helps the fish grow faster

• It can harm fish and other marine life

• It improves water quality

• It makes water clearer