Bio gas production is more useful when compared to the direct use of dung because
both fuel value and fertiliser value are effectively utilised
production of bio gas involves less labour
fuel is quickly produced
the fertiliser produced is a fluid
Use of chlorofluoro carbons is not encouraged because
they are harmful to the eyes of people that use it
they damage the refrigerators and air conditioners
they eat away the ozone in the atmosphere
they destroy the oxygen layer
Conversion of oxygen into ozone is non-spontaneous at
all temperature
high temperature
room temperature
low temperature
Which one of the following is not a common component of photo-chemical smog?
Ozone
Acrolein
Peroxy acetyl nitrate
Chloroflourocarbons
Producer gas is a mixture of:
CO and N2
CO2 and H2
N2 and O2
CH4 and N2
A.
CO and N2
Water gas is mixture of CO and H2. Producer gas is mixture of CO and N2.
The radiant energy from the sun is due to :
combustion
nuclear fusion
nuclear fission
chemical reaction
The smog is essentially caused by the presence of
O2 and O3
O2 and N2
oxides of sulphur and nitrogen
O3 and N2
Which of the following is responsible for depletion of the ozone layer in the upper strata of the atmosphere ?
Polyhalogens
Ferrocenes
Fullerenes
Freons
Match the Column I and Column II and choose the correct code given below.
Column I | Column II |
A. Peroxyacetyl nitrile | i. Waste incineration |
B. Indigo | ii. Vat dye |
C. IR active molecules | iii. Global warming |
D. Dioxins | iv. Photchemical smog |
A - iv; B - ii; C - iii; D - i
A - i; B - ii; C - iv; D - iii
A - ii; B - i; C - iv; D - iii
A - iv; B - i; C - iii; D - ii