What does the more stringent norms for fuel mean?
(1) Reducing sulphur and aromatic content in petrol and diesel fuel
(2) Reducing lead in petrol
(3) Increasing CNG use
(4) All of these
Aromatic hydrocarbons should be 42 per cent of the concerned fuel. This was according to
(1) Euro II Norms
(2) Euro III Norms
(3) Euro IV Norms
(4) Euro I Norms
The goal according to roadmap is to reduce sulphur content to …….in petrol and diesel.
(1) 42 per cent
(2) 150 ppm
(3) 50 ppm
(4) 30 per cent
How much amount of impurities are present in waste water which make it unfit for human use?
(1) 0.01%
(2) 0.1%
(3) 0.2%
(4) 2%
Biodegradable organic matter of domestic sewage is used as a substrate by
(1) Bacteria and Other microbes
(2) Industries
(3) Lichens
(4) All of these
Algal bloom is due to and results in:
(1) Presence of large amount of nutrients in water
(2) Excessive growth of free floating or planktonic algae
(3) Distinct color to the water bodies
(4) All of these
Which of the following statements is wrong?
(1) Algal bloom cause deterioration of the water quality and fish mortality
(2) Some bloom forming algae are extremely toxic to human beings and animals
(3) Sewage discharge causes mortality of fish and other aquatic creatures
(4) Beautiful orange colored flowers have caused havoc in India because of their faster growth
Water hyacinth
Find the odd one out
(1) Eichhornia crassipes
(2) Introduced in India for their lovely flowers
(3) Have mauve colored flowers
(4) Does not has any characteristic shape
Sewage has heavy metals
(1) Elements with density greater than 5g /cm3
(2) Elements with density greater than 10g /cm3
(3) Elements with density greater than 15g /cm3
(4) Substances with density greater than 0.3g/cm3
Biomagnification is a well known phenomenon for
(1) Mercury
(2) DDT
(3) Silver
(4) Both A and B