CBSE Questions for Class 12 Medical Biology Environmental Issues Quiz 11 - MCQExams.com

Biomedical waste is very hazardous for human life.
  • True
  • False
Which harmful radiations are absorbed by ozen layer?
  • UV
  • X-RAY
  • Visible light
  • Gamma rays
Wastes may be sealed in concrete-filled drums and discharged to a depth of about 500 m. This specific statement is true for 
  • Radio active materials
  • U. V. radiations pollutants
  • Particle pollutants
  • Radioactive pollutants
Why ozone is known as 'chemical weed ' ?
  • Because it is formed by chemical reactions
  • Because it is harmful as well useful
  • Because it is harmful, just like weeds for mankind
  • Ozone is not designated as chemical weed
Ozone hole over Antarctica appear during
  • Spring
  • Autumn
  • Summer
  • Winter
BOD of lake becomes high by :-
  • Vehicles
  • Wind mill
  • Smoke and ammonia
  • Detergents
Snow blindness is caused by ____________.
  • U.V.B
  • Global warming
  • Radioactive pollution
  • Deforestation
The e-wastes:
  • Represents municipal solids
  • Is produced in developing countries and exported to developed countries
  • Are burried in land fills or incinerated
  • Does not involve recycling
Control of automobile air pollution can be done by all except:
  • use of biopetrol
  • periodic check up of pollution control for all vehicles
  • use of low sulphur diesel or CNG
  • prefering individual vehicles.
Which one of the following options correctly designate the percent contribution of gases (A, B, C and D) responsible of global warming?

ABCD
$$(1)$$$$CH_4(20\%)$$$$CFCs(14\%)$$$$N_2O(6\%)$$$$CO_2(60\%)$$
$$(2)$$$$CFCs(20\%)$$$$CO_2(14\%)$$$$N_2O(6\%)$$$$CH_4(60\%)$$
$$(3)$$$$N_2O(20\%)$$$$CH_4(14\%)$$$$CFCs(6\%)$$$$CO_2(60\%)$$
$$(4)$$$$CH_4(20\%)$$$$N_2O(14\%)$$$$CFCs(6\%)$$$$CO_2(60\%)$$

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  • A
  • B
  • C
  • D
At which level of radioactivity released by radioactive waste can kill vegetation and cause irreparable injuries to humans and animals? 
  • Interger level radiation
  • Low level radiation
  • Intermediate level radiation
  • High level radiation
All except one mentioned below is an incorrectly mentioned rule framed under Environment (Protection) act,Identify it.
  • Ozone Depleting Substanes Rules, 2000
  • Harzardous Wastes Rules, 1989
  • Air Prevention and Control of Pollution Act, 1981
  • Biomedical Wastes Rules, 1998
Which of the processes is used to dispose the radioactive wastes?
  • ground storage
  • ocean disposal
  • landfills
  • vary based on activity
The atmospheric greenhouse effect is produced mainly by the:
  • Absorption and re-emission of visible light by the atmosphere
  • Absorption and re-emission of ultraviolet radiation by the atmosphere
  • Absorption and re-emission of infrared radiation by the atmosphere
  • Absorption and re-emission of visible light by clouds
Chlorine atoms in the upper atmosphere cause the breakdown of ozone.
$$Cl+O_3\rightarrow O_2+ClO$$
$$ClO+O\rightarrow Cl+O_2$$
Which statements about these chlorine atoms are correct?
$$1$$. The chlorine atoms act as catalysts.
$$2$$. The chlorine atoms are free radicals.
$$3$$. The chlorine atoms are formed by heterolytic fission of a covalent bond in chlorofluorocarbons.
  • $$1, 2$$ and $$3$$ are correct
  • $$1$$ and $$2$$ only are correct
  • $$2$$ and $$3$$ only are correct
  • $$1$$ only is correct
Incineration of Municipal waste involves
  • Oxidation
  • Deduction
  • Redox action
  • Disintegration
The maximum in daytime surface temperature typically occurs _____________ the earth receives its most intense solar radiation.
  • Before
  • After
  • Exactly when
  • Long time
At night, low clouds:
  • Enhance the atmospheric greenhouse effect
  • Weaken the atmospheric greenhouse effect
  • Are often caused by the atmospheric greenhouse effect
  • Have no effect on the atmospheric greenhouse effect
Of the gases listed below, which is NOT believed to be responsible for enhancing the earth's greenhouse effect?
  • Chlorofluorocarbons $$(CFC_{s})$$
  • Molecular oxygen $$(O_{2})$$
  • Nitrous oxide $$(N_{2}O)$$
  • Carbon dioxide $$(CO_{2})$$
Which of the radioactive material is largely associated with bone cancer
  • Radium-226
  • Thorium-232
  • Strontium-90
  • Iodine
Example for a physical pollutant
  • Water
  • Air
  • Radiation
  • Plant
Solid waste increases with an increase in
  • Road Construction
  • Educational Institutions
  • Urbanization
  • Farms
The earth's radiative equilibrium temperature is:
  • The temperature at which the earth is absorbing solar radiation and emitting infrared radiation at equal rates
  • The temperature at which the earth is radiating energy at maximum intensity
  • The average temperature the earth must maintain to prevent the oceans from freezing solid
  • The temperature at which rates of evaporation and condensation on the earth are in balance
Man made sources of radiation pollution are:
  • mining
  • explosion of nuclear weapons
  • nuclear fuels and preparation of radioactive isotopes
  • all of these
Commonly used radioactive isotopes in scientific research
  • 14 C
  • 125 I
  • 32 P
  • all of these
Primary treatment reduces BOD, ranges from;
  • 30-60%
  • 0-70%
  • 30-35%
  • 20-80%
The cutting down of trees and setting them on fire and raising crops on the resulting ash is called:
  • Pyrolysis
  • Jhum
  • Taungya system
  • Shift cultivation
A strong radiation inversion is more likely to occur on a:
  • Warm, windy night.
  • Cool, windy night.
  • Rainy night with light winds.
  • Clear night with light winds.
UV radiations is injurious to plants because it
  • break phosphate bonds
  • increases respiration
  • causes dehydration
  • causes genetic changes
General source of municipal waste are residential, commercial and
  • Manure
  • Kitchen Waste
  • Open area waste
  • Farms
Radioactive contamination also known as:
  • Radiological anatomy
  • Radiological contamination
  • Radiological imagining
  • Radiological assistant
Finely divided solid, remaining either with in solution or in suspension is known as
  • Settaleable Solids
  • Dissolved Solids
  • Suspended solids
  • Colloidal Solids
What causes rapid melting of glaciers?
  • Natural occurance of climatic variability
  • Man-made global warming
  • Volcanic eruption
  • Solar variability
Quantity of solid waste produced, depends on living standard of
  • Housing
  • Consumption
  • Populations
  • All of above
'Carbon dioxide' molecules in air absorb
  • Ultraviolet radiations
  • Infrared Radiations
  • Sunlight
  • Heat
What is important to support marine animals in water bodies?
  • Dissolved Oxygen
  • Nitrogen
  • $$CO$$
  • $$CO_{2}$$
What kind of problem is a solid waste?
  • Urban Problem
  • Regional Problem
  • Global problem
  • Hosuehold Problem
What can humanitarian be harmed by unmitigated greenhouse emissions?
  • Severe weather
  • Infectious diseases
  • Food crises
  • All of above
How much BOD reduces in preliminary treatment?
  • 15 to 30%
  • 17 to 60%
  • 19 to 80%
  • 10 to 90%
What is 'adiabatic lapse' rate for wet air?
  • 0.6C per 100meter
  • 0.9C per 100meter
  • 0.7C per 100meter
  • 0.5C per 100meter
What does happen to lighter components of solid waste in sea?
  • It keeps on Floating
  • It Submerges
  • It Dissolves
  • All of above
The large-scale deforestation that is happening all over world is causing :
  • Loss of biodiversity
  • Soil erosion
  • Global warming
  • All of these
Groundwater will not be depleted due to
  • Afforestation
  • Thermal power plants
  • Loss of forest, and decreased rainfall
  • Cropping of high water demanding crops
Which among the following planet / body shows anti-green house effect?
  • Mars
  • Venus
  • Jupiter
  • Titan
The steps required for conversion of kitchen garbage into manure are given below in a jumbled form.
(i) Put garbage in a pit
(ii) Cover the bottom of the pit with sand
(iii) Cover the pit loosely with a gunny bag or grass
(iv) Add worms
Which of the following shows the correct sequence of the above steps?
  • (ii); (i); (iii); (iv)
  • (i); (ii); (iii); (iv)
  • (ii); (iv); (i); (iii)
  • (iv); (i); (ii); (iii)
  • (ii); (i); (iv); (iii)
Classification of solid waste includes:
  • Rubbish
  • Garbage
  • Agricultural waste
  • All of above
Solid waste are disposed in a coastal areas, having a deep sea water in
  • Compositing
  • Disposal into the Sea
  • Pulverization
  • Incinertion
Which is third fundamental function of solid waste management?
  • Disposal
  • Collection
  • Processing
  • Compositing
The function of tree plantation is celebrated through:
  • Environment Day
  • Social Forestry programme
  • Vana Mahotsava
  • Vani
The common refrigerant chlorofluoro-methane (freon) and NO$$_2$$ is a serious pollutant because 
  • It lowers atmospheric temperature.
  • It prevents cloud condensation.
  • It destroys haemoglobin.
  • It disrupts O$$_3$$ layer.
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