CBSE Questions for Class 11 Medical Chemistry Environmental Chemistry Quiz 1 - MCQExams.com

The layer of atmosphere between $$10\ km$$ to $$50\ km$$ above the sea level is called as:
  • troposphere
  • mesosphere
  • stratosphere
  • thermosphere
The regions of the atmosphere, where clouds form and where we live respectively, are:
  • Stratosphere and Troposphere
  • Troposphere and Stratosphere
  • Troposphere and Troposphere
  • Stratosphere and Stratosphere
Biochemical Oxygen Demand $$(BOD)$$ is the amount of oxygen required (in ppm) :
  • for the photochemical breakdown of waste present in $$1\ m^3$$ volume of a water body.
  • by bacteria to break-down organic waste in a certain volume of a water sample.
  • for sustaining life in a water body.
  • by anaerobic bacteria to break down inorganic waste present in a water body.
Biochemical Oxygen Demand(BOD) value can be a measure of water pollution caused by the organic matter. Which of the following statements is correct?
  • Polluted water has BOD value higher than $$10$$ ppm
  • Aerobic bacteria decrease the BOD value
  • Anaerobic bacteria increase the BOD value
  • Clean water has BOD value higher than $$10$$ ppm
Which is wrong with respect to our responsibility as a human being to protect our environment?
  • Avoiding the use of floodlighted facilities.
  • Restricting the use of vehicles
  • Using plastic bags
  • Setting up compost tin in gardens,
Depletion of which gas in the atmosphere can lead to an increase incidence of skin cancers?
  • Nitrous oxide
  • Ozone
  • Ammonia
  • Methane
World ozone day is celebrated on __________
  • $$16^{th}$$ September
  • $$5^{th}$$ June
  • $$22^{nd}$$ April
  • $$21^{st}$$ April
Ozone in stratosphere extends
  • 10-20km
  • 20-25km
  • 15-30km
  • 25-40km
The stratospheric ozone depletion leads to?
  • Global warming
  • Increase in the incidence of skin cancers
  • Forest fires
  • All of the above
  • Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
  • Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
  • Assertion is correct but Reason is incorrect.
  • Both Assertion and Reason are incorrect.
Which one of the following is an environment related disorder, with the correct main cause?
  • Black lung disease (pneumoconiosis) found mainly in workers in stone quarries and crushers.
  • Blue baby disease (methaemoglobinaemia) due to heavy use of nitrogen rich fertilizers in the area.
  • Non-Hodgkin's lymphoma found mainly in workers involved in manufacture of neem based pesticides.
  • Skin cancer mainly in people exposed to benzene and methane.
According to origin, identify the secondary air pollutant.
  • $$SO_2$$
  • Ash
  • Ozone
  • Radioactive compound
If $$CCl_{3}F$$(CFCs) is present in the stratosphere, it will react with which of the following:
A) Ozone    B) $$N_{2}$$     C)$$CO_{2}$$
  • A
  • B
  • A & B
  • C & A
The soil pollutants that affect the food chain and food web, killing microorganisms and plants are
  • Pathogens
  • Chemical fertilisers
  • Agricultural wastes
  • Pesticides
Which of the following is not a cause of pollution?
  • Afforestation
  • Wars among nations
  • Industrialization
  • Growth of algae in water
Which one is not dangerous for life and atmosphere?
  • Biopollutants
  • Ozone layer
  • Nuclear blast
  • Deforestation
Excessive exposure of humans to UV-rays results in
  • damage to immune system
  • damage to lungs
  • skin cancer
  • peptic ulcers
The result of ozone hole is
  • Acid rain
  • UV radiations reach the surface of earth
  • Global warming
  • Green house effect
Chief source of soil and water pollution is:
  • mining
  • agro industry
  • thermal power plant
  • all the three
Atmosphere of big cities is polluted most by :
  • Automobile exhausts
  • Radioactive fall out
  • Household waste
  • Pesticide residue
The temperature in troposphere with altitude:
  • increases
  • decreases
  • increases and then decreases
  • decreases and then increases
The region in atmosphere containing water vapour is:
  • thermosphere
  • stratosphere
  • troposphere
  • mesosphere
Pollution is a change in physical, chemical or biological characters of our land and water that may be:
  • desirable and harmful to humans
  • desirable and useful to humans
  • undesirable and harmful to humans
  • undesirable and useful to humans
The ______ treatment plants help to clean water before discharging it into water bodies.
  •  biomedical waste 
  • Solid waste
  • Sewage
  • None of the above
The ozone layer in earth's atmosphere is crucial for human survival because it
  • Has ions
  • Reflects radio signals
  • Reflects ultraviolet rays
  • Reflects infrared rays
In which layer, most of the atmospheric air is present?
  • Troposphere
  • Stratosphere
  • Mesosphere
  • Thermosphere
What are the different ways in which water gets contaminated?
  • Untreated sewage
  • Oil spill
  • Throwing chemical waste into waters
  • All of these
The contamination of water bodies very often by human activities is known as:
  • water pollutants
  • air pollution
  • water pollution
  • air pollutants
Water treatment plants should be installed in all _________ areas .
  • desert
  • residential
  • industrial
  • none of the above
______ is the contamination of water by substances harmful to life.
  • Water pollution
  • Air pollution
  • Noise pollution
  • None of the above
Treatment of waste water involves physical, chemical, and biological processes, which remove _______ matter that contaminates waste water.
  • physical
  • chemical and biological 
  • both $$A$$ and $$B$$
  • none of the above
Which of the following is a bio fertilizer?
  • Blue green algae
  • Nitrogen fixing bacteria
  • Both A and B
  • None of the above
What measure do farmers use to control soil acidity?
  • Farmers use pesticides
  • Farmers use chemical fertilizers
  • Farmers use borax
  • Farmers use limestone
Ozone is present as a chief constituent in which region of the atmosphere?
  • Troposphere
  • Stratosphere
  • Mesosphere
  • Thermosphere
In which of the following year, the depletion of the ozone layer have been noticed?
  • 1979
  • 1980
  • 1981
  • 1982
Ozone layer acts as _____ .
  • Natural sun block
  • Artificial block
  • Semi natural
  • None of these
What happen when the destruction of the ozone layer increases?
  • The amount of harmful ultraviolet radiation
  • The amount of needful ultraviolet radiation
  • The amount of ultra radiations
  • None of these
_______ is an environment-friendly product and better than halons which are used to extinguish fire.
  • Ibuprofen
  • Pyrocool
  • Carcinogen
  • Carbon-dioxide
__________ is made from cow dung is mainly used as fertilizer to prevent soil pollution.
  • Manure
  • DDT
  • Sodium chlorate
  • Sodium arsenite
Which of the following is not an objective of Green chemistry?
  • It is better to prevent waste than to treat or clean up waste after it has been created.
  • The use of auxiliary substances (e.g., solvents, separation agents, etc.) should be made unnecessary wherever possible and innocuous when used.
  • Energy requirements of chemical processes should be recognized for their environmental and economic impacts and should be minimized. If possible, synthetic methods should be conducted at ambient temperature and pressure.
  • None of the above
Cutting of trees decreases:
  • pollution level
  • temperature
  • fertility of soil
  • carbon dioxide level
Which of them are Non-biodegradable waste?
  • Synthetic fibers
  • Pen refills
  • Silver foil
  • All of above
The full form of LDPE is low-density polyester, which is monomer of first grade _______ unit.
  • ester
  • alcohol
  • ether
  • phenol
Which of the following is not primary pollutant?
  • $$SO_2$$
  • $$H_2S$$
  • $$CO$$
  • $$SO_3$$
Which method is used to degrade the waste by microorganism in the absence of oxygen?
  • Dumping
  • Composting
  • Digesting
  • Incineration
Green chemistry is:
  • way of thinking and utilising the existing knowledge and principles of chemistry and other sciences
  • study of plants for making the environment clean
  • both A and B
  • None of the above
Major chemical species present in stratosphere is:
  • $$N_2, O_2$$
  • $$O_3, H_2O$$
  • Both A and B
  • None of these
Which of these are particulates?
  • Dust and fumes
  • Fly ash and smoke
  • Mist and fumes
  • All of these
Industrial waste include:
  • chemical solvents, paints
  • sandpaper, paper products
  • industrial by-products, radioactive waste
  • all the above
$$pH$$ of the rain is increased in heavy industrial area due to:
  • acid rain
  • land pollution
  • water pollution
  • none of the above
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