All Free Forestry MCQs with Answers

• A. Traffic sirens
• B. Sirens and loud speakers
• C. Industries
• D. Kitchen appliances, radio and TV

Explanation: In residential areas, household sources such as kitchen appliances, radios and televisions are the characteristic contributors to noise…

• A. Air, soil and water
• B. Soil and water both
• C. Air and water both
• D. Soil only

Explanation: Radioactive fallout consists of radioactive particles and materials that can be transported through the air and deposited on soil and…

• A. Drying of the lake very soon due to algal bloom
• B. Death of fish due to lack of oxygen
• C. Increased population of aquatic food web organisms
• D. An increased production of fish due to lot of nutrients

Explanation: Organic sewage initially promotes algal growth, but its decomposition consumes dissolved oxygen in the water.

• A. August, 8th
• B. August, 9th
• C. August, 6th
• D. August, 4th

Explanation: The first atomic bomb used in war was detonated over Hiroshima on 6 August 1945. The bombing of Nagasaki followed on 9 August.

• A. Chernobyl
• B. Trombay
• C. Narora
• D. TMI-2

Explanation: The Three Mile Island Unit 2 accident in the United States in 1979 is generally regarded as the first major commercial nuclear reactor…

• A. 0.01 ppm
• B. 0.001 ppm
• C. 0.5 ppm
• D. 0.75 ppm

Explanation: The approximate background concentration of sulphur dioxide in clean atmospheric air is commonly given as about 0.01 ppm in environmental…

• A. C16
• B. C18
• C. Both (a) & (b)
• D. C10

Explanation: C16 and C18 hydrocarbons have high molecular masses and very low volatility, so they are not normally present as freely circulating…

• A. Geneva
• B. Islamabad
• C. Sydney
• D. Rio-de-Janeiro

Explanation: The 1992 Earth Summit, formally the United Nations Conference on Environment and Development, was held in Rio de Janeiro, Brazil.

• A. Non-gaseous
• B. Mainly gaseous
• C. Gaseous
• D. Mainly non-gaseous

Explanation: Particulate matter consists of suspended solid particles and liquid droplets such as dust, soot, smoke and aerosols, so it is classified…

• A. Phosphene
• B. SiF4
• C. Dust
• D. Halogens

Explanation: Phosphate-rock processing and phosphate fertilizer manufacture can release silicon tetrafluoride, SiF4, along with other fluoride…

• A. Zn,Mo,Mg,Ag
• B. P,Mn,B,Mg
• C. N,K,Mo
• D. Pb, Hg, Cr, Cd

Explanation: Lead, mercury, chromium and cadmium are toxic heavy metals that persist and can bioaccumulate in aquatic food chains.

• A. DNA
• B. Cell membranes
• C. Mitochondria and ribosomes
• D. Nucleus

Explanation: Ionising radiation is most damaging when it breaks or chemically alters DNA, causing mutations, chromosome damage or cell death.

• A. SO2
• B. CO
• C. CO2
• D. NO2

Explanation: Carbon monoxide causes anoxia-like oxygen deprivation by binding haemoglobin much more strongly than oxygen, forming carboxyhaemoglobin.

• A. London
• B. Paris
• C. Stockholm
• D. Tokyo

Explanation: The first major international conference focused on global environmental problems was the 1972 United Nations Conference on the Human…

• A. Sewage
• B. Plastic
• C. Polythene
• D. DDT

Explanation: Sewage contains organic matter that microorganisms can decompose, so it is a biodegradable pollutant.

• A. Smoke filters
• B. Ringelmann's charts
• C. Horizontal microscopes
• D. All of these

Explanation: Ringelmann's charts compare the apparent darkness or opacity of smoke with standardized shades, allowing smoke density to be estimated…

• A. SO2 and SO3
• B. SO2 and oxides of nitrogen
• C. Suspended particulate matter
• D. Hydrocarbons and N2O

Explanation: Suspended particulate matter scatters and absorbs light, producing haze and reducing visibility more directly than the listed gases.

• A. Tansley
• B. Odum
• C. Des Voeux
• D. Clements

Explanation: The word smog combines smoke and fog and was coined by Dr Henry Antoine des Voeux in 1905 while describing polluted London air.

• A. London
• B. Paris
• C. Tokyo
• D. New York

Explanation: Classical, or London-type, smog was characteristically observed in London under cool, humid conditions, with coal smoke and sulphur…

• A. Osteosclerosis
• B. Minamata disease
• C. Bright's disease
• D. Hashimoto disease

Explanation: Minamata disease is severe mercury poisoning caused by eating contaminated fish, especially from industrial methylmercury discharge.