set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

A green house

a) both the above

b) is that “body” which allows the short wavelength incoming solar radiation to enter in, but does not allow long wavelength outgoing infra-red radiations to escape out

c) is an enclosure of glass in which plants are kept to protect them from cold air outside

d) none of the above

Question : 2

Which raw material is used in the preparation of soft glass ?

a) Na₂CO₃, SiO₂, CaCO₃

b) K₂CO₃, SiO₂, PbCO₃

c) K₂CO₃, Sio₂, CaCO₃

d) Na₂CO3, SiO2, PbO

Question : 3

Which among the following statements is false?

a) The main reason for river water pollution is industrial and domestic sewage discharge

b) Surface water contains a lot of organic matter mineral nutrients and radioactive materials

c) Oil slick in sea water increases D.O. value

d) Oil spill in sea water causes heavy damage to fishery

Question : 4

Which of the following gas causes pollution –

a) CO

b) SO₂

c) Both (a) and (b)

d) None of the above

Question : 5

The substance which is not regarded as a pollutant?

a) CO₂

b) O₃

c) NO₂

d) Hydrocarbons