Environmental Issues

The thickness of ozone in a column of air in the atmosphere is measured in terms of :

1. Decibels
2. Decameter
3. Kilobase
4. Dobson units

Which one of the following statements is NOT correct?

1. Algal blooms caused by excess of organic matter in water improve water quality and promote fisheries
2. Water hyacinth grows abundantly in eutrophic water bodies and leads to an imbalance in the ecosystem dynamics of the water body
3. The amount of some toxic substances of industrial waste water increases in the organisms at successive trophic levels
4. The micro-organisms involved in biodegradation of organic matter in a sewage polluted water body consume a lot of oxygen causing the death of aquatic organisms

Which of the following statements is correct?

1. Biomagnification refers to increase in concentration of the toxicant at successive trophic levels.
2. Presence of large amount of nutrients in water restricts ‘Algal Bloom’
3. Algal Bloom decreases fish mortality
4. Eutrophication refers to increase in domestic sewage and waste water in lakes.

Given below are two statements: In the light of the above statements, choose the most appropriate answer from the options given below:

1. Both Statement I and Statement II are incorrect.
2. Statement I is correct but Statement II is incorrect.
3. Statement I is incorrect but Statement II is correct.
4. Both Statement I and Statement II are correct.

The device which can remove particulate matter present in the exhaust from a thermal power plant is:

1. STP
2. Incinerator
3. Electrostatic Precipitator
4. Catalytic Converter

The entire fleet of buses in Delhi were converted to CNG from diesel. In reference to this, which one of the following statements is false?

1. CNG burns more efficiently than diesel
2. The same diesel engine is used in CNG buses making the cost of conversion low
3. It is cheaper than diesel
4. It cannot be adulterated like diesel

Given below are two statements: In the light of the above statements, choose the most appropriate answer from the options given below:

1. Both Statement I and Statement II are correct
2. Both Statement I and Statement II are incorrect
3. Statement I is correct but Statement II is incorrect
4. Statement I is incorrect but Statement II is correct

Why CNG is considered better fuel than diesel? Choose the most appropriate answer from the options given below :

1. C, D and E only
2. A, B, C and E only
3. A, C and D only
4. A, B, D and E only

Dobson units are used to measure thickness of :

1. Troposphere
2. CFCs
3. Stratosphere
4. Ozone

Snow-blindness in Antarctic region is due to

1. High reflection of light from snow
2. Freezing of fluids in the eye by low temperature
3. Inflammation of cornea due to high dose of UV-B radiation
4. Damage to retina caused by infra-red rays

Montreal protocol was signed in 1987 for control of

1. Disposal of e-wastes
2. Transport of Genetically modified organisms from one country to another
3. Emission of ozone depleting substances
4. Release of Green House gases

Which of the following protocols did aim for reducing emission of chlorofluorocarbons into the atmosphere?

1. Gothenburg Protocol
2. Geneva Protocol
3. Montreal Protocol
4. Kyoto Protocol

Polyblend, a fine powder of recycled modified plastic, has proved to be a good material for :

1. Construction of roads
2. Making tubes and pipes
3. Making plastic sacks
4. use as a fertilizer

Which of the following pairs of gases is mainly responsible for green house effect?

1. Nitrogen and Sulphur dioxide
2. Carbon dioxide and Methane
3. Ozone and Ammonia
4. Oxygen and Nitrogen

Which of these following methods is the most suitable for disposal of nuclear waste?

1. Dump the waste within rocks under deep ocean
2. Bury the waste within rocks deep below the Earth’s surface
3. Shoot the waste into space
4. Bury the waste under Antarctic ice-cover

In stratosphere, which of the following elements acts as a catalyst in degradation of ozone and release of molecular oxygen?

1. Carbon
2. Cl
3. Fe
4. Oxygen

Which of the following is a secondary pollutant?

1. CO
2. CO2
3. SO2
4. O3

World Ozone Day is celebrated on

1. 5th June
2. 21st April
3. 16th September
4. 22nd April

Which one of the following statements is not valid for aerosols ?

1. They alter rainfall and monsoon patterns
2. They have negative impact on agricultural land
3. They cause increased agricultural productivity
4. They are harmful to human health

A system of rotating crops with legume or grass pasture to improve soil structure and fertility is called -

1. Shifting agriculture
2. Strip farming
3. Ley farming
4. Contour farming

Depletion of which gas in the atmosphere can lead to an increased incidence of skin cancers

1. Methane
2. Ozone
3. Nitrous oxide
4. Ammonia

Joint Forest Management Concept was introduced in India during :

1. 1990s
2. 1970s
3. 1960s
4. 1980s

A river with an inflow of domestic sewage rich in organic waste may result in -

1. Death of fish due to lack of oxygen
2. Increased population of aquatic food web organisms
3. Drying of the river very soon due to algal bloom
4. An increased production of fish due to biodegradable nutrients

Biochemical Oxygen Demand (BOD) may not be a good index for pollution for water bodies receiving effluents from

1. petroleum industry
2. sugar industry
3. domestic sewage
4. dairy industry

A lake which is rich in organic waste may result in

1. mortality of fish due to lack of oxygen
2. increased population of fish due to lots of nutrients
3. increased population of aquatic organisms due to minerals
4. drying of the lake due to algal bloom

The highest DDT concentration in aquatic food chain shall occur in

1. crab
2. Phytoplankton
3. eel
4. seagull

Acid rain is caused by increase in the atmospheric concentration of -

1. SO3 and CO
2. CO2 and CO
3. O3 and dust
4. SO2 and NO2

Eutrophication of water bodies leading to killing of fishes is mainly due to nonavailability of

1. light
2. food
3. essential minerals
4. oxygen

The UN conference of Parties on climate change in the year 2012 was held at:

1. Lima
2. Warsaw
3. Doha
4. Durban

Which of the following are most suitable indicators of SO2 pollution in the environment?

1. Conifers
2. Fungi
3. Algae
4. Lichens