set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

The filament of an electric bulb is of tungsten because –

a) It is cheaper

b) Its resistance is negligible

c) Its melting point is high

d) Filament is easily made

Question : 2

Ozone layer in upper atmosphere (stratosphere) is destroyed by –

a) chlorofluoro carbon (CFC)

b) photochemical smog

c) hydrochloric acid

d) sulphur dioxide

Question : 3

What is DDT among the following ?

a) A fertilizer

b) Biodegradable pollutant

c) Greenhouse gas

d) Non-biodegradable pollutant

Question : 4

Flint glass is obtained from which of the following?

a) Sodium aluminum borosilicate

b) Sand, red lead and potassium carbonate

c) Zinc and barium borosilicate

d) Pure silica and zinc oxide

Question : 5

The statement which is not true:

a) SO₃ is more harmful air pollutant than SO₂

b) NO₂ does not play any role in photochemical smog

c) SO₂ does not affect larynx (voice box)

d) NO is more toxic to living tissues than NO₂

Question : 6

Green chemistry means such reactions which

a) reduce the use and production of hazardous chemicals

b) are related to the depletion of ozone layer

c) produce colour during reactions

d) study the reactions in plants