Multiple Choice QuestionsAssertion : Pollution is always caused by human activities.
Reason : Pollution is not different from contamination.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
Assertion : Chlorofluorocarbons are responsible for ozone depletion.
Reason : Ozone level decreases by as much as 67% every year.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
B.
If both assertion and reason are true but reason is not the correct explanation of assertion
A slight thinning of ozone layer occurs naturally for a few months every year over Antarctica. It decreases by 67% every year.
The primary chemicals responsible for ozone depletion are a group of chlorine containing compounds called Chloroflurocarbons (CFCs), used as coolants in air conditioners and refrigerators and propellants for aerosol cans and form blowing agents for insulation and packaging and also as solvents.
Besides halons, methyl bromide, methyl chloroform, carbon tetrachloride and nitrous oxide are also responsible for O3 loss. After their release into troposphere, CFCs and other chlorine containing compounds go to stratosphere where these are broken down by UV-radiations releasing chlorine. Similarly, Bromine (Br) is released by breakdown of halons and methyl bromide. The sunlight catalyzes the chemical reaction by which chlorine or bromine break O3 molecules and convert them into O2 molecules. This chemical reaction does not change Cl or Br and thus single chlorine or bromine atom can breakdown many thousands of O3 molecules.
The Montreal Protocol refers to
persistent organic pollutants
global warming and climate change
substances that deplete the ozone layer
biosafety of genetically modified organisms.
Which one of the following statement pertaining to pollutants is correct?
DDT is a non-biodegradable pollutant
Excess fluoride in drinking water causes osteoporosis
Excess cadmium in drinking water causes black foot disease
Methylmercury in water may cause "Itai ltai" disease
Assertion: Deforestation is one main factor contributing to global warming.
Reason: Besides CO2, two other gases methane and CFCs are also included under green house gases.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false.
Assertion: UV radiation causes photodissociation of ozone into O2 and O3 thus causing damage to the stratospheric ozone layer.
Reason: Ozone hole is resulting in global warming and climate change.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false.
Assertion: The concentration of methane in the atmosphere has more than doubled in the last 250 years.
Reason: Wetlands and rice fields are the major sources of methane.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false.
Assertion : A suspended particulate matter (SPM) is an important pollutant released by diesel vehicles.
Reason : Catalytic converters greatly reduce pollution caused by automobiles.
If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
If both Assertion and Reason are true but the Reason is not the correct explanation of the assertion
If Assertion is true but Reason is false.
If both Assertion and Reason are false
Assertion : Methane component of green house gases contributing to global warming is about 20 percent.
Reason : Introduction of multi-point fuel injection engines in automobiles has decreased methane content in the exhausts.
If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
If both Assertion and Reason are true but the Reason is not the correct explanation of the assertion
If Assertion is true but Reason is false
If both Assertion and Reason are false
Nitrogen oxides produced from the emission of automobiles and power plants, are the source of fine air borne particles which lead to
photochemical smog
dry acid deposition
industrial smog
wet acid deposition
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