Chapter 33

Which among these gives the measure of organic pollution in water? (a) COD (b) DO (c) \(\mathrm{pH}\) (d) salinity

Which statement is correct about biodegradable materials? (a) these are toxic in nature (b) these can be broken down by bacteria (c) these are used for converting waste to greenery (d) these spoil the biological environment

Fluoride in water is removed using precipitation method by (a) lime and alum (b) lime, alum and bleaching powder (c) activated carbon (d) defluoron

DDT is (a) a non degradable pollutant (b) a fertilizer (c) an antibiotic (d) dichloro difluoro titanium

Cyclon collector is used for minimizing (a) water pollution (b) sound pollution (c) soil pollution (d) air pollution

In Antarctica, ozone depletion is due to the formation of compound. (a) \(\mathrm{SO}_{2}\) and \(\mathrm{SO}_{3}\) (b) chlorine nitrate (c) acrolein (d) (d) formaldehyde

Household fuel (LPG) mainly contains (a) \(\mathrm{CH}_{4}\) (b) \(\mathrm{C}_{2} \mathrm{H}_{2}\) (c) \(\mathrm{C}_{2} \mathrm{H}_{4}\) (d) \(\mathrm{C}_{4} \mathrm{H}_{10}\)

\(\mathrm{CFCl}_{3}\) is responsible for the decomposition of ozone into oxygen. Which of the following reacts with ozone to form oxygen? (a) \(\mathrm{Cl}_{2}\) (b) \(\mathrm{Cl}^{-}\) (c) \(\mathrm{F}^{-}\) (d) \(\mathrm{Cl}^{*}\)

Biosphere includes (a) plants and animals (b) rocks and minerals (c) atmosphere and lithosphere (d) water sources

The major components of the atmosphere are (a) \(\mathrm{CO}_{2}\) and \(\mathrm{N}_{2}\) (b) \(\mathrm{O}_{3}\) and \(\mathrm{SO}_{2}\) (c) \(\mathrm{CO}\) and \(\mathrm{CO}_{2}\) (d) \(\mathrm{N}_{2}\) and \(\mathrm{O}_{2}\)

The upper most region of the atmosphere is (a) troposphere (b) exosphere (c) stratosphere (d) ionosphere

The point of temperature inversion between troposphere and ionosphere is called (a) mesopause (b) stratopause (c) ionopause (d) tropopause

\(\mathrm{BOD}\) is connected with (a) microbes (b) organic matter (c) both (a) and (b) (d) none of these

Biodegradable pollutant is (a) DDT (b) domestic waste (c) aluminium foil (d) mercury salt

Minamata disease is caused due to the presence of \(\ldots \ldots\) in water. (a) \(\mathrm{Hg}\) (b) \(\mathrm{Pb}\) (c) \(\mathrm{Cd}\) (d) As

Which one of the following is an invaluable source of energy but does not cause pollution? (a) fossil fuels (b) nuclear energy (c) sun (d) petroleum.

Water is often treated with chlorine to (a) kill germs (b) remove hardness (c) increase oxygen content (d) remove suspended particles

Major sources of NOx pollutants are (a) natural gas (b) gasoline (c) combustion of coal and oil (d) all of these

Ozone hole refers to (a) hole in ozone layer (b) reduction in the thickness of ozone layer in stratosphere (c) reduction in the thickness of ozone layer in troposphere (d) increased concentration of ozone

Which of the following is a primary pollutant? (a) \(\mathrm{PAN}\) (b) aldehydes (c) \(\mathrm{CO}\) (d) \(\mathrm{H}_{2} \mathrm{SO}_{4}\)

Which of the following is not regarded as a pollutant? (a) \(\mathrm{CO}_{2}\) (b) \(\mathrm{O}_{3}\) (c) \(\mathrm{NO}_{2}\) (d) hydrocarbons

Which of the following is not a greenhouse gas? (a) water vapour (b) \(\mathrm{CO}_{2}\) (c) \(\mathrm{O}_{2}\) (d) \(\mathrm{CH}_{4}\)

The greenhouse effect is (a) rise in temperature of the earth (b) rise in pressure on the earth (c) decrease in oxygen content of the earth's atmo-sphere (d) decrease in CO \(_{2}\) content of earth's atmosphere

Which of the following is responsible for depletion of the ozone layer in the upper strata of the atmosphere? (a) freons (b) ferrocene (c) fullerenes (d) polyhalogens

Ozone in stratosphere is depleted by (a) \(\mathrm{C}_{7} \mathrm{~F}_{16}\) (b) \(\mathrm{C}_{6} \mathrm{~F}_{6}\) (c) \(\mathrm{CF}_{2} \mathrm{Cl}_{2}\) (d) \(\mathrm{C}_{6} \mathrm{H}_{6} \mathrm{Cl}_{6}\)

Which of the following is not an air pollutant? (a) \(\mathrm{N}_{2} \mathrm{O}\) (b) \(\mathrm{N}_{2}\) (c) \(\mathrm{CO}\) (d) \(\mathrm{NO}\)

Control of pollution is possible by (a) developing bio remedies (b) planting trees (c) controlling the population growth (d) all of these

Acid rain (a) retards the growth of trees (b) effects big marble constructions (c) results in loss of flora and fauna (d) all of these

The industrial usage of fluorocarbons is very high because (a) they are unstable (b) they are gases (c) they can be manufactured cheaply (d) their reactivity is high

Hydrosphere includes various forms of water as (a) polar ice caps and ground water (b) oceans and lakes (c) sea and rivers (d) all of these

The presence of fluoride ion in polluted water can be detected by using (a) KI+ starch (b) zirconium alizarin-S dye (c) \(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}+50 \% \mathrm{H}_{2} \mathrm{SO}_{4}\) (d) sodium nitroprusside

The phosphates present in sewage water which cause eutrophication can be removed by adding (a) alum (b) chlorine (c) lime (d) permanganate

Ozone is an important constituent of stratosphere because it (a) removes poisonous gases of the atmosphere by reacting with them (b) destroys bacteria which are harmful to human life (c) prevents the formation of smog over large cities (d) absorbs ultraviolet radiation which is harmful to human life

The excessive use of phosphates as water softeners leads to aquatic pollution called (a) eutrophication (b) phosphorylation (c) deoxygenation (d) denitrification

Spraying of DDT causes pollution of (a) air (b) air and water (c) air and soil (d) air, water and soil

Which of the following causes water pollution? (a) fly ash (b) pesticides (c) auto exhausts (d) aeroplanes

Ozone layer is present in (a) stratosphere (b) troposphere (c) mesosphere (d) exosphere

Human ear can tolerate noise upto (a) 100 decible (b) 80 decible (c) 60 decible (d) 40 decible

Sound pollution is mainly due to (a) industrial estates (b) airport, railway stations (c) sound systems (d) all of these

Ozone hole is maximum over (a) Africa (b) Europe (c) Antarctica (d) India

Ozone layer of stratosphere requires protection from indiscriminate use of (a) aerosols and high flying jets (b) balloons (c) pesticides (d) atomic explosions

Sound pollution does not cause (a) mental disorder (b) hearing problems (c) headache (d) skin diseases

Proper management for disposal of household and industrial wastes can be done by (a) sewage treatment (b) recycling the waste material to give useful products again (c) burning and incineration of combustible waste (d) all of these

Contaminant is (a) a pollutant released from the industries (b) a pollutant (c) a component originally not present in environment but released into environment by human activity (d) a pollutant released into the environment in natural calamites

There is a possibility of melting of polar ice caps and increase in the level of sea water due to (a) greenhouse effect (b) acid rain (c) depletion of ozone layer (d) any one of these

Which of the following gases cause pollution when present in the exhaust fumes of vehicles? (a) water vapours (b) \(\mathrm{CO}_{2}\) (c) \(\mathrm{CO}\) (d) \(\mathrm{C}_{2} \mathrm{H}_{6}\)

The poisonous gas present in the exhaust fumes of car is (a) \(\mathrm{CO}_{2}\) (b) \(\mathrm{CO}\) (c) \(\mathrm{CH}_{4}\) (d) \(\mathrm{C}_{2} \mathrm{H}_{2}\)

Incomplete combustion of petrol or diesel in automobile engines can be best detected by testing the fuel gases for the presence of (a) sulphur dioxide (b) nitrogen dioxide (c) carbon monoxide (d) carbon monoxide and water vapour

Which one of the following regions of atmosphere contains ozone? (a) troposphere (b) stratosphere (c) mesosphere (d) thermosphere

The greenhouse effect is caused by (a) \(\mathrm{CO}\) (b) \(\mathrm{NO}\) (c) \(\mathrm{NO}_{2}\) (d) \(\mathrm{CO}_{2}\)