Fuel

1.	Which one of the following gases is a fuel for combustion?
	A. hydrogen
	B. nitrogen
	C. carbon dioxide
	D. oxygen Option”D” is correct

2.	A concentrated solution of which of the following is kept in a fire extinguisher along with concentrated sulfuric acid kept in a bottle?
	A. calcium carbonate
	B. Sodium chloride
	C. sodium bicarbonate
	D. sodium sulfate Option”C” is correct

3.	In a conventional fire extinguisher, carbon dioxide is produced by the reaction of
	A. Limestone and dilute sulfur
	B. marble and dilute hydrochloric acid
	C. sodium bicarbonate and dilute sulfur
	D. sodium carbonate and dilute hydrochloric acid Option”C” is correct

4.	Which gas is used in fire extinguishing
	A. helium
	B. Carbon dioxide
	C. CO
	D. oxygen Option”B” is correct

5.	Water cannot extinguish burning petrol because
	A. A mixture of petrol and water produces a flammable chemical
	B. Burning petrol instantly vaporizes water
	C. Petrol floats in water due to its low relative density.
	D. Water releases oxygen on contact with burning petrol, which helps in burning Option”C” is correct

6.	Which of the following is not a fuel element
	A. uranium
	B. thorium
	C. radium
	D. helium Option”D” is correct

7.	Which of the following is not a fossil fuel
	A. Coal
	B. petroleum
	C. nitrogen
	D. water gas Option”C” is correct

8.	Which of the following is the best fuel in terms of energy released per gram of fuel?
	A. hydrogen
	B. methane
	C. ethanol
	D. butane Option”A” is correct

9.	Producer gas is a mixture of –
	A. CO + N₂
	B. CO₂ + N₂
	C. CO + FEMALE + FEMALE
	D. CO + LOOK Option”A” is correct

10.	Which of the following is used as propellant or fuel in rockets
	A. liquid hydrogen + liquid nitrogen
	B. liquid oxygen + liquid nitrogen
	C. liquid nitrogen + liquid oxygen
	D. liquid hydrogen + liquid oxygen Option”D” is correct

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