The humans pollute the air by :
(a) burning a vast amount of coal
(b) burning waste materials
(c) using petrol and diesel vehicles
(d) all the above
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Burning of fossil fuel adds …………… A) H2 , O2 , , N2 , in air
B) CO2 ,NO2 , SO2 gases in air
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The field of design for fabric and apparel has expanded and become so vast that it can actually be considered as two specializations.
Two ways of creating rhythm 1.Repetition of laces, colour, embroidery, etc 2.Cordation by gradual increase or decrease in size of motifs, lines, buttons, etc. Two ways of shifting the emphasis away from the...
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If the gas liberated in an experiment allows the burning splinter to continue burning more brightly in its presence, the gas is ………………….
Correct option is A) oxygen
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Spoiling of food may lead to ………………… and pollute the environment also.
Food shortage
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Spoiling of food may lead to ………………… and pollute the environment also.
2 Answers
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A drop of engine oil can pollute ……… litres of water.
A drop of engine oil can pollute 25 litres of water.
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Why should a magnesium ribbon be cleaned before burning in air?
Magnesium ribbon should be cleaned with sandpaper before burning in air due to the following reasons: • Magnesium is very reactive element which rapidly reacts with oxygen in the air to...
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Why should a magnesium ribbon be cleaned before burning in air?
2 Answers
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Name the phenomenon that leads to situations like ‘XO’ abnormality in humans. How do humans with ‘XO’ abnormality suffer? Explain.
Absence of one X chromosome leads to XO abnormality. These are sterile female with rudimentary ovaries. They have shield-shaped thorax, webbed neck, poor development of breasts, short stature, small uterus...
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Destructive distillation of coal yields (i) coal tar (ii) coal gas
all of the above
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