Is the official RBSE Environmental Science exam multiple-choice only?

No. Official RBSE papers mix objective and constructed-response tasks; subjects with practical or skill components also require that evidence. The 100 questions here are an English-language MCQ study adaptation for concept practice only.

What is the subject code for RBSE Environmental Science?

RBSE lists Environmental Science under subject code 061 in the 2026 main examination subject-wise statistics.

What is the typical passing standard?

RBSE generally requires minimum 33% in the subject; where theory and practical are separate, candidates must meet the scheme for each component. Confirm the current session circular.

Where can I find the official syllabus?

Download board syllabus materials from rajeduboard.rajasthan.gov.in (Class 12 syllabus PDF).

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100+ Free RBSE SS Env Sci Practice Questions

Rajasthan RBSE Senior Secondary (Class 12) Environmental Science — Code 061 practice questions are available now; exam metadata is being verified.

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See RBSE subject-wise statistics for the examination year (statistics2026.htm). Pass Rate

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2026 Statistics

Key Facts: RBSE SS Env Sci Exam

061

RBSE subject code for Environmental Science

RBSE 2026 subject-wise statistics

100

Typical full marks for the subject scheme

RBSE syllabus examination scheme

3.15 hrs

Typical theory paper duration

RBSE Class 12 / Varishtha Upadhyaya syllabus scheme

33%

Typical minimum pass marks (confirm circular)

RBSE examination regulations

100

Free English MCQ study questions on this page

OpenExamPrep practice bank

RBSE Senior Secondary (Class 12) Environmental Science (code 061) is a real Board of Secondary Education, Rajasthan public-examination subject with appeared candidates in the 2026 main examination subject-wise statistics. Typical scheme: Theory 56 + Sessional 14 = 70 and Practical 30 = 100; passing generally 33% (and separate practical pass where applicable). Use these free MCQs for theory revision only.

Sample RBSE SS Env Sci Practice Questions

Try these sample questions to test your RBSE SS Env Sci 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 primary constituent of photochemical smog formation along with hydrocarbons?

A.Argon

B.Helium

C.Neon

D.Nitrogen oxides (NOx)

Explanation: Photochemical smog forms when nitrogen oxides and volatile hydrocarbons react under sunlight to produce ozone and other oxidants.

2The term BOD in water quality stands for:

A.Biological Oxygen Demand

B.Basic Organic Density

C.Buffered Oxide Deposit

D.Bacterial Oil Dilution

Explanation: BOD measures the amount of dissolved oxygen consumed by microbes while decomposing organic matter in water; high BOD indicates heavy organic pollution.

3Minamata disease is associated with chronic poisoning by which heavy metal?

A.Sodium

B.Mercury

C.Iron

D.Calcium

Explanation: Minamata disease in Japan was caused by methylmercury contamination of seafood from industrial discharge.

4Itai-itai disease is linked to long-term exposure to which metal?

A.Gold

B.Silver

C.Platinum

D.Cadmium

Explanation: Itai-itai disease in Japan resulted from cadmium-contaminated rice and water, causing severe bone pain and kidney damage.

5Noise pollution is commonly measured in which unit?

A.Pascal only

B.Joule only

C.Lux

D.Decibel (dB)

Explanation: Sound intensity level is expressed in decibels (dB); environmental and occupational noise standards use dB(A) weighting.

6Particulate matter PM2.5 refers to particles with diameter less than or equal to:

A.2.5 micrometres

B.2.5 millimetres

C.2.5 centimetres

D.2.5 metres

Explanation: PM2.5 particles are 2.5 µm or smaller and can penetrate deep into lungs and enter the bloodstream.

7Eutrophication of lakes is mainly accelerated by excess inputs of:

A.Pure distilled water only

B.Inert sand alone

C.Dissolved gold

D.Nitrogen and phosphorus nutrients

Explanation: Nutrient enrichment, especially nitrogen and phosphorus from sewage and agricultural runoff, drives algal blooms and oxygen depletion.

8Which secondary air pollutant is a major component of photochemical smog?

A.Molecular nitrogen (N2)

B.Helium

C.Ground-level ozone (O3)

D.Argon

Explanation: Ground-level ozone is formed secondarily from NOx and VOCs under sunlight and is a key oxidant in photochemical smog.

9Acid rain typically has a pH value:

A.Exactly 14

B.Always above 10

C.Exactly 7 with no variation

D.Below about 5.6

Explanation: Natural rain is mildly acidic (~5.6) due to CO2; acid rain from SOx and NOx is more acidic (often pH 4–5 or lower).

10Which disease is classically linked to prolonged arsenic-contaminated groundwater exposure?

A.Rickets only

B.Night blindness only

C.Arsenicosis with skin lesions and cancers

D.Scurvy only

Explanation: Chronic arsenicosis from contaminated wells causes skin pigmentation changes, keratosis, and increased cancer risk.

About the RBSE SS Env Sci Practice Questions

Verified exam format metadata for Rajasthan RBSE Senior Secondary (Class 12) Environmental Science — Code 061 is pending. The practice questions above remain available while official exam length, timing, passing score, fee, and administrator details are reviewed.

100+ Free RBSE SS Env Sci Practice Questions

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Key Facts: RBSE SS Env Sci Exam

Sample RBSE SS Env Sci Practice Questions

About the RBSE SS Env Sci Practice Questions