41.There are 3 zones of a flame 1. Dark zone 2. Luminous zone 3. Non luminous.
Which one is hottest?
(A) Luminous
(B) Non luminous
(C) Dark zone
(D) All of the above
42.Unburnt carbon particles in air cause ………………
(A) Eyes problem
(B) Respiratory problems
(C) Skin problems
(D) None of the above
43.Increased percentage of carbon dioxide in air has been linked to ……………..
(A) Earth warming
(B) Global warming
(C) Heat trapping
(D) None of the above
44.Burning of coal and diesel releases …………….which is suffocating and corrosive gas
(A) Dust particles
(B) Nitrogen dioxide gas
(C) Sulphur dioxide gas
(D) All of the above
45.Petrol engines gives off ………………
(A) Nitrogen dioxides
(B) Dust particles
(C) Ashes
(D) Carbon
46.Oxides of sulphur and nitrogen produced by the burning of coal, diesel and petrol causes ………….
(A) Convectional rain
(B) Acid rain
(C) Cyclonic rain
(D) Orographic rain
47.………….is harmful for crops, building and soil.
(A) Acid rain
(B) Nitrogen
(C) Sulphur
(D) None of the above
48.….is a cleaner fuel.
(A) Kerosene
(B) Hydrogen
(C) Charcoal
(D) CNG
49.What is the full form of CNG.
(A) Compressed Normal Gas
(B) Comparison Natural Gas
(C) Compression Natural Gas
(D) Compressed Natural Gas
50.Diesel and petrol in automobiles are replaced by
(A) CNG
(B) DNG
(C) Fossil fuel
(D) All of the above
Answers:-
| 41-(B) | 42-(B) | 43-(B) | 44-(C) | 45-(A) | 46-(B) | 47-(A) | 48-(D) | 49-(D) | 50-(A) |