FBISE · Class 9
Class 9 Chemistry MCQs: Environmental Chemistry-Water
Practice chapter-wise MCQs with answers and explanations. Use the quiz mode for timed online tests.
Quick revision
Class 9 Chemistry MCQs Environmental Chemistry-Water are one of the fastest ways to improve your board exam performance — especially when you practice with purpose, revise weak concepts, and learn from explanations.
On Prepzy, you can practice 78 MCQs from “Environmental Chemistry-Water” in Chemistry for FBISE. Each question is designed to mirror the style, wording, and concept-testing approach used in Pakistani board papers.
Use this chapter page to revise definitions, formulas, and key ideas, then attempt the MCQs in small sets. Track patterns in your mistakes: is it a concept gap, a calculation error, or a misread statement? Fixing the pattern is what raises your score.
If you’re preparing for matric / SSC Part exams, focus on understanding the concept first, then speed. MCQs reward clarity — not memorization. A clear concept turns into fast correct answers.
What to focus on
- Primary focus: Environmental Chemistry-Water concepts tested in Class 9 Chemistry
- Practice with instant answer-checking to reduce repeated mistakes
- Revise common definitions, units, and standard results before timed practice
- Aim for accuracy first, then build speed with short quizzes
Study tips
- Read the question stem first, then scan options for distractors (near-correct choices).
- If the chapter is formula-heavy, write a mini-formula sheet and revise it before every attempt.
- After each practice set, re-attempt only the wrong MCQs to convert weak areas into strengths.
- Mix easy + medium MCQs for momentum, then finish with hard questions for exam readiness.
MCQs (sample)
Showing 25 questions from this chapter. For a full timed test, use “Start online test”.
1. What does water dissolve as it flows over rocks and soil?
- Minerals
- Gases
- Organic material
- Plastic
Answer & explanation
Correct: Minerals
Water dissolves minerals while flowing over rocks and through soil.
2. What are fertilizers primarily used for?
- To provide essential elements for plant growth
- To increase soil acidity
- To control pests
- To decrease water retention
Answer & explanation
Correct: To provide essential elements for plant growth
Fertilizers are substances that provide essential elements for plant growth.
3. What is one of the main reasons for water scarcity in Pakistan?
- Population growth
- Excessive rainfall
- High altitude
- Abundant groundwater
Answer & explanation
Correct: Population growth
The population of Pakistan is growing rapidly, which increases the demand for water.
4. What type of waste is mentioned as a source of infectious microorganisms?
- Human waste
- Chemical waste
- Plastic waste
- Electronic waste
Answer & explanation
Correct: Human waste
Human waste contains infectious microorganisms that can spread diseases.
5. What is the boiling point of pure water at sea level?
- 100°C
- 0°C
- 50°C
- 200°C
Answer & explanation
Correct: 100°C
The boiling point of pure water is 100°C at sea level.
6. What is the first step in the treatment of raw water?
- Sedimentation
- Coagulation
- Filtration
- Chlorination
Answer & explanation
Correct: Sedimentation
Sedimentation is the process where water is allowed to stand so suspended matter sinks to the bottom.
7. What is one way to deal with reduced oxygen levels in water bodies?
- Control nutrient flow
- Increase sewage output
- Encourage algae growth
- Reduce water temperature
Answer & explanation
Correct: Control nutrient flow
Controlling nutrient flow helps in preventing excessive algae growth which reduces oxygen levels.
8. What happens to water when minerals are in sufficient concentration?
- It becomes safe for use
- It becomes unfit for use
- It becomes odorless
- It becomes colorless
Answer & explanation
Correct: It becomes unfit for use
When minerals are in sufficient concentration, water becomes unfit for human use.
9. What are the three main nutrients provided by NPK fertilizers?
- Nitrogen, phosphorus, potassium
- Sodium, calcium, magnesium
- Iron, zinc, copper
- Carbon, hydrogen, oxygen
Answer & explanation
Correct: Nitrogen, phosphorus, potassium
NPK fertilizers mainly provide nitrogen (N), phosphorus (P), and potassium (K).
10. How has climate change affected water availability in Pakistan?
- By increasing rainfall
- By causing irregular rainfall patterns
- By creating more groundwater
- By lowering temperatures
Answer & explanation
Correct: By causing irregular rainfall patterns
Climate change has caused irregular rainfall patterns, which affects water availability.
11. Which of the following diseases is caused by a parasite?
- Dysentery
- Hepatitis
- Typhoid
- Jaundice
Answer & explanation
Correct: Dysentery
Dysentery is caused by the parasite entamoeba.
12. What happens to anhydrous copper(II) sulphate when it absorbs water?
- It turns pink.
- It turns brown.
- It turns blue.
- It stays white.
Answer & explanation
Correct: It turns blue.
Anhydrous copper(II) sulphate turns blue when it absorbs water and forms hydrated copper(II) sulphate.
13. Which materials are used in the coagulation process of water treatment?
- Alum and slaked lime
- Sand and gravel
- Chlorine and sodium
- Coal and charcoal
Answer & explanation
Correct: Alum and slaked lime
Coagulation involves treating water with slaked lime and alum to form aluminum hydroxide.
14. What can accumulate in the tissues of aquatic organisms due to water pollution?
- Heavy metals
- Nutrients
- Oxygen
- Microbes
Answer & explanation
Correct: Heavy metals
Heavy metals present in polluted water can accumulate in the tissues of aquatic organisms.
15. Which of the following is NOT listed as a human activity that pollutes water?
- Detergents
- Household waste
- Solar energy production
- Agricultural waste
Answer & explanation
Correct: Solar energy production
Solar energy production is not listed as a human activity that pollutes water.
16. Which of the following is NOT mentioned as an important fertilizer?
- Urea
- Potassium nitrate
- Ammonium salts
- Calcium carbonate
Answer & explanation
Correct: Calcium carbonate
Calcium carbonate is not mentioned as an important fertilizer in the content.
17. What method of irrigation is commonly used in Pakistan, leading to water loss?
- Drip irrigation
- Traditional flood irrigation
- Sprinkler irrigation
- Subsurface irrigation
Answer & explanation
Correct: Traditional flood irrigation
Traditional flood irrigation methods are widely used in Pakistan, leading to significant water losses.
18. What is one way water in swimming pools is purified?
- Boiling
- Aeration
- Filtration
- Storing
Answer & explanation
Correct: Aeration
Water in swimming pools is purified by aeration and chlorination.
19. Which of the following substances can pollute natural water bodies?
- Dissolved oxygen
- Nitrates from fertilizers
- Iron
- Copper
Answer & explanation
Correct: Nitrates from fertilizers
Nitrates from fertilizers can enter water bodies and cause pollution.
20. What does aluminum hydroxide do in the water treatment process?
- Carries down dirt particles and bacteria
- Cleans the water chemically
- Removes color and odor
- Chlorinates the water
Answer & explanation
Correct: Carries down dirt particles and bacteria
Aluminum hydroxide carries down dirt particles and bacteria during coagulation.
21. How can preventing industrial wastewater from entering waterways be beneficial?
- It increases aquatic plant growth
- It minimizes emissions of harmful heavy metals
- It reduces water temperature
- It encourages algae bloom
Answer & explanation
Correct: It minimizes emissions of harmful heavy metals
Preventing industrial wastewater from entering waterways can minimize emissions of heavy metals that are harmful.
22. What type of waste can household wastes include?
- Pesticides
- Industrial chemicals
- Vegetable wastes
- Heavy metals
Answer & explanation
Correct: Vegetable wastes
Household wastes can include vegetables, among other things.
23. What is nutrient management in the context of fertilizers?
- A method to increase soil temperature
- A practice to apply fertilizers at the right time and amount
- A technique to grow more weeds
- A way to reduce soil erosion
Answer & explanation
Correct: A practice to apply fertilizers at the right time and amount
Nutrient management optimizes the intake of nutrients by plants and reduces the loss of nutrients.
24. Which of the following is NOT mentioned as a necessary solution to water scarcity in Pakistan?
- Effective water management practices
- Development of infrastructure
- Increased rainfall
- Public awareness of responsible water use
Answer & explanation
Correct: Increased rainfall
Increased rainfall is not mentioned as a solution to water scarcity in Pakistan.
25. Which disease is characterized by abdominal cramps and diarrhea?
- Jaundice
- Typhoid
- Hepatitis
- Dysentery
Answer & explanation
Correct: Dysentery
Dysentery is characterized by abdominal cramps and diarrhea.
FAQs
Are these Class 9 Chemistry MCQs Environmental Chemistry-Water aligned with FBISE?
Yes. The MCQs are organized chapter-wise for FBISE and designed to match board exam patterns. If your teacher has added custom MCQs, they will also appear here.
How many MCQs should I practice from “Environmental Chemistry-Water” each day?
A good daily target is 20–40 MCQs with full review of mistakes. If you’re short on time, do 15 MCQs but read explanations carefully.
What’s the best way to revise this chapter before an exam?
Revise the chapter summary, list your weak sub-topics, then practice MCQs in timed sets. Re-attempt wrong questions after a short break to lock in learning.
Can I take an online test for this chapter?
Yes. Start a chapter quiz to simulate an online test. Use it to improve speed and accuracy under time pressure.