Environmental Chemistry Practice Questions
HSC/SSC (Bangladesh) · HSC Chemistry · 141 free MCQs with instant results and detailed explanations.
141
Total
39
Easy
75
Medium
27
Hard
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Sample Questions from Environmental Chemistry
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
Which of the following is a major greenhouse gas contributing to global warming?
A.
Carbon Dioxide
B.
Nitrogen
C.
Oxygen
D.
Helium
Show Answer & Explanation
Correct Answer: A
Carbon Dioxide (CO2) is a significant greenhouse gas that traps heat in the atmosphere, leading to global warming. The other gases listed do not have the same effect.
Q2
Easy
What is the primary cause of acid rain?
A.
Sulfur dioxide and nitrogen oxides
B.
Carbon monoxide
C.
Ozone depletion
D.
Methane emissions
Show Answer & Explanation
Correct Answer: A
Acid rain is mainly caused by sulfur dioxide (SO2) and nitrogen oxides (NOx) that react with water vapor in the atmosphere to form sulfuric and nitric acids.
Q3
Easy
Which of the following is a method to reduce water pollution?
A.
Treating wastewater before discharge
B.
Using more plastic
C.
Disposing of waste in rivers
D.
Increased use of fertilizers in agriculture
Show Answer & Explanation
Correct Answer: A
Treating wastewater before it is discharged into water bodies is an effective method to reduce water pollution, while the other options contribute to increased pollution.
Q4
Medium
What is the primary cause of acid rain?
A.
Carbon dioxide emissions
B.
Sulfur dioxide emissions
C.
Ozone depletion
D.
Chlorofluorocarbons
Show Answer & Explanation
Correct Answer: B
Acid rain is primarily caused by sulfur dioxide emissions, which can be released from industrial processes and vehicles. This gas reacts with water vapor in the atmosphere to form sulfuric acid, leading to acid rain.
Q5
Medium
Which of the following methods is effective for removing heavy metals from wastewater?
A.
Chlorination
B.
Bioremediation
C.
Filtration
D.
Neutralization
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Correct Answer: B
Bioremediation uses microorganisms to break down or remove heavy metals from wastewater, making it an effective method for treating contaminated water. The other options are not specifically designed for heavy metal removal.
Q6
Medium
What does the term 'biodiversity' refer to in environmental science?
A.
Variety of ecosystems
B.
Variety of species
C.
Variety of genetic material
D.
All of the above
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Correct Answer: D
Biodiversity encompasses the variety of ecosystems, species, and genetic material within a given area, making 'All of the above' the correct choice as it includes all aspects of biodiversity.
Q7
Medium
Which of the following tests is commonly used to monitor water quality?
A.
pH testing
B.
Boiling point determination
C.
Melting point determination
D.
Refractive index measurement
Show Answer & Explanation
Correct Answer: A
pH testing is a standard method for assessing water quality, as it indicates the acidity or alkalinity of water, which is crucial for ecological health. The other options are not typically used for water quality monitoring.
Q8
Hard
Which of the following compounds is primarily responsible for the depletion of the ozone layer?
A.
CFCs (Chlorofluorocarbons)
B.
SO2 (Sulfur Dioxide)
C.
NOx (Nitrogen Oxides)
D.
CO2 (Carbon Dioxide)
Show Answer & Explanation
Correct Answer: A
CFCs are the main agents that lead to ozone layer depletion. They release chlorine atoms in the stratosphere, which catalyze the breakdown of ozone (O3) into oxygen (O2), thus thinning the ozone layer.
Q9
Hard
When calculating the biochemical oxygen demand (BOD) of a water sample, what is the primary purpose of measuring the amount of oxygen consumed over five days?
A.
To determine the presence of harmful pathogens
B.
To assess the organic matter present in the water
C.
To evaluate the total dissolved solids
D.
To measure the pH level of the water
Show Answer & Explanation
Correct Answer: B
BOD measures the amount of oxygen that microorganisms will consume while decomposing organic matter. A higher BOD indicates a higher presence of organic waste, which is critical for assessing water quality.
Q10
Hard
Which of the following processes is primarily responsible for the degradation of chlorofluorocarbons (CFCs) in the atmosphere?
A.
Photodissociation
B.
Hydrolysis
C.
Oxidation
D.
Condensation
Show Answer & Explanation
Correct Answer: A
Photodissociation is the process by which CFCs are broken down by ultraviolet (UV) radiation in the stratosphere, leading to the release of chlorine atoms that deplete ozone.
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Environmental Chemistry — HSC/SSC (Bangladesh) HSC Chemistry Practice Questions Online
This page contains 141 practice MCQs for the chapter Environmental Chemistry in HSC/SSC (Bangladesh) HSC Chemistry. The questions are organized by difficulty — 39 easy, 75 medium, 27 hard — so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit.