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100+ Free Odisha BSE HSC Env & Pop Ed Practice Questions

Environment and Population Education (SEP) — Odisha BSE High School Certificate (Class 10) practice questions are available now; exam metadata is being verified.

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Key Facts: Odisha BSE HSC Env & Pop Ed Exam

SEP

Official BSE Odisha subject code/name for Environment & Population Education (Class X)

BSE Odisha Class X subject-wise syllabus

100 marks

Full marks for Environment and Population Education annual paper (2h 30m)

BSE Odisha Pattern of Question 2026

50 + 50

MCQ marks + subjective marks on the official SEP paper

BSE Odisha Pattern of Question 2026

25 + 25

Environment MCQs + Population MCQs (1 mark each) on the official paper

BSE Odisha Pattern of Question 2026

2022 text

Prescribed book Paribesh 'O' Jana Sankhya Adhyayan (2022 Edition)

BSE Odisha Class X syllabus

HSC fee

SEP examination cost included in overall BSE Odisha HSC form fill-up fees

BSE Odisha HSC fee practice (session circulars)

BSE Odisha HSC Environment and Population Education (SEP) is a Class 10 board subject (textbook Paribesh 'O' Jana Sankhya Adhyayan 2022) with a 100-mark mixed paper: 50 MCQ + 50 subjective in 2h 30m. Official name SEP; not a language paper. Fee included in HSC form fill-up. This free bank is an English MCQ study adaptation for pollution, health, gender, HIV, and drug-abuse topics.

Sample Odisha BSE HSC Env & Pop Ed Practice Questions

Try these sample questions to test your Odisha BSE HSC Env & Pop Ed exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which gas is the main component of clean, dry air near Earth's surface?
A.Nitrogen (about 78%)
B.Only pure carbon dioxide
C.Only pure chlorine gas
D.Only pure sulfur dioxide
Explanation: Dry air is about 78% nitrogen and 21% oxygen, with small amounts of argon, CO2, and other gases. Pollution adds harmful substances above natural levels.
2Air pollution is best defined as:
A.Only the smell of flowers after rain
B.Only cold weather with no chemicals
C.Only empty air with zero gases
D.The presence of substances in air in concentrations that harm humans, living organisms, materials, or the environment
Explanation: Air pollution means unwanted solid, liquid, or gaseous substances that degrade air quality and cause harm when present beyond safe levels.
3Which of the following is a major primary air pollutant from incomplete combustion of fossil fuels?
A.Pure nitrogen gas only
B.Only water vapour with no carbon
C.Carbon monoxide (CO)
D.Pure oxygen gas only
Explanation: Incomplete combustion produces CO, a toxic gas that reduces the blood's oxygen-carrying capacity by binding to haemoglobin.
4Sulphur dioxide (SO2) in air is mainly associated with:
A.Only melting of pure ice far from cities
B.Burning of sulphur-containing coal and oil and certain industrial processes
C.Only pure rainwater with no industries
D.Only photosynthesis in green plants
Explanation: SO2 is released when sulphur in fuels is burned; it irritates airways and contributes to acid rain when oxidized and combined with water.
5Particulate matter (PM) such as PM2.5 is dangerous mainly because:
A.Fine particles can enter deep into the lungs and even the bloodstream
B.Particles always make air healthier to breathe
C.Particles only exist on the Moon
D.Particles never affect human health
Explanation: Fine particulates penetrate deep into the respiratory system and are linked to asthma, heart disease, and other health problems.
6Acid rain is formed mainly when:
A.Only pure sugar dissolves in rain
B.Only pure oxygen forms soft rain
C.Only dust settles without any chemical change
D.Oxides of sulphur and nitrogen react with water vapour to form acidic precipitation
Explanation: SO2 and NOx oxidize and dissolve in atmospheric moisture to form sulphuric and nitric acids that fall as acid rain or dry deposition.
7Which practice best reduces outdoor air pollution from vehicles?
A.Idling engines for long periods without need
B.Removing all catalytic converters permanently
C.Using cleaner fuels, efficient engines, public transport, and vehicle emission checks
D.Burning more tyres for heat
Explanation: Reducing fuel use, improving combustion, and controlling tailpipe emissions cut CO, NOx, hydrocarbons, and particulates from transport.
8The ozone layer high in the stratosphere is beneficial because it:
A.Makes acid rain fall continuously
B.Absorbs much of the Sun's harmful ultraviolet (UV) radiation
C.Completely blocks all oxygen from reaching Earth
D.Produces only pure carbon monoxide for breathing
Explanation: Stratospheric ozone shields life from excessive UV-B radiation that can cause skin cancer, eye damage, and harm to ecosystems.
9Ground-level (tropospheric) ozone is mainly a secondary pollutant formed when:
A.Nitrogen oxides and volatile organic compounds react in sunlight
B.Only pure nitrogen freezes at night with no sunlight
C.Only pure argon mixes with helium
D.Only groundwater evaporates without chemistry
Explanation: Photochemical reactions among NOx and VOCs produce ground-level ozone, a major component of smog that irritates lungs.
10Which indoor source can significantly raise carbon monoxide risk if poorly ventilated?
A.Only open windows with clean outdoor air
B.Only electric LED bulbs with no combustion
C.Only cold water storage tanks
D.Burning charcoal, wood, or kerosene in closed rooms
Explanation: Incomplete combustion indoors without ventilation can build lethal CO levels; never burn fuel in sealed rooms.

About the Odisha BSE HSC Env & Pop Ed Practice Questions

Verified exam format metadata for Environment and Population Education (SEP) — Odisha BSE High School Certificate (Class 10) is pending. The practice questions above remain available while official exam length, timing, passing score, fee, and administrator details are reviewed.