1. World environmental day is a)5th June b)5th April c)5th October d)5th December
Ans- a) 5th june
2. Standard BOD of water is taken for a)2 days b)3 days c)5 days d)10 days
Ans- 5 days
3. Which of the following is an air pollutant? A)dust b)smoke c)mist d)alcohols
Ans- a) dust
4. Which source of water ,among the following is not a sub-surface source a)spring b)well c)storage reservoir d)infiltration gallery
Ans- c) storage reservoir
5. Water are considered soft if the hardness is of the order of a)75 ppm b)150 ppm c)125 ppm d)300 ppm
Ans- a) 75ppm
6. The major photochemical oxidant is a)ozone b)hydrogen peroxide c)nitrogen oxides d)PAN
Ans- c) nitrogen oxides
7. Biomedical waste may be disposed of by a)incineration b)autoclaving c)land filling d)both b)&c)
Ans- a) incineration
8. A water having ph equal to 7 is a)acidic b)alkaline c)neutral d)none
Ans- c) neutral
9. The highest heating valve is of a)garbage b)rubbish c)hospital waste d)industrial waste
Ans- c) hospital waste
10. The suitable method for forecasting population fora young and rapidly developing city is ……a)arithmetic mean method b)geometric mean method c)comparative graphical method d)none
Ans- b) geometric mean method