The correct set of species responsible for the photochemical smog is:
Air pollution that occurs in sunlight is :
The regions of the atmosphere, where clouds form and
where we live, respectively, are:
Troposphere and Stratosphere
Stratosphere and Troposphere
Troposphere and Troposphere
Stratosphere and Stratosphere
The primary pollutant that leads to photochemical; smog is:
The maximum prescribed concentration of copper in drinking water is:
Excessive release of into the atmosphere results in :
Assertion: Ozone is destroyed by in the upper stratosphere.
Reason: Ozone holes increase the amount of UV radiation reaching the earth.
Assertion and reason are correct, but the reason is not the explanation for the assertion.
Assertion and reason are incorrect.
Assertion is false, but the reason is correct.
Assertion reason are both correct, and the reason is the correct explanation for the assertion.
Which is wrong with respect to our responsibility as a human being to protect our environment ?
Restricting the use of vehicles
Avoiding the use of floodlighted facilities.
Using plastic bags.
Setting up compost tin in gardens
Identify the pollutant gases largely responsible for the discoloured and lustreless nature of marble of the Taj Mahal.
O3 and CO2
CO2 and NO2
SO2 and NO2
SO2 and O3
Peroxyacetyl nitrate ( PAN ) , an eye irritant is produced by :
Photochemical smog .
Taj Mahal is being slowly disfigured and discoloured. This is primarily due to :
The concentration of dissolved oxygen (DO) in cold water can go upto :
The higher concentration of which gas in air can cause stiffness of flower buds ?
The compound that is NOT a common component of photochemiclal smog is :
The upper stratosphere consisting of the ozone layer protects us from the sun's radiation that falls in the wavelength region of :
600 - 750 nm
400 - 550 nm
0.8 - 1.5 nm
200 - 315 nm
The reaction thst is NOT involve in the ozone layer depletion mechanism in the stratosohere is:
Water filled in two glasses A and B have BOD values of 10 and 20 , respectively . The correct statement regarding them , is
B is more polluted than A .
A is suitable for drinking , whereas B is not .
Both A and B are suitable for drinking .
A is more polluted than B .
Water samples with BOD values of 4 ppm and 18 ppm, respectively, are :
Clean and Highly polluted
Highly polluted and Highly polluted
Clean and Clean
Highly polluted and Clean
Biochemical oxygen demand (BOD) -
The amount of oxygen required for five days in one litre of water at 200 C for the microorganisms to metabolite organic waste.
Clear water has BOD less than 5 ppm , highly polluted water has BOD of 17 ppm or more.
As we have learned in BOD that clear water would have BOD value of less than 5ppm where as highly polluted water could have is BOD value of 15ppm or max
Clean and Highly pollutedOption 2)
Highly polluted and Highly pollutedOption 3)
Clean and CleanOption 4)
Highly polluted and Clean
The molecule that has minimum/ no role in the formation of photochemical smog, is :
The of rain water , is approximately :