271. What is used to prevent freezing of fuel in space crafts?

1. Benzene
2. Glycol
3. Acetylene
4. Ester

Option “B” is correct
Glycol is an organic compound with the formula (CH2OH)2. It is used to prevent freezing of fuel in space crafts.
272. _________ is the major component of natural gas.

1. Acetone
2. Methane
3. Chlorine
4. Hexane

Option “B” is correct
Methane is a chemical compound with the chemical formula CH₄ and it is a major component of natural gas.
273. Carbon dioxide is produced by all of the following except –

1. Burning fossil fuels
2. Global warming
3. Cement production
4. Automobiles

Option “B” is correct
Global warming, also referred to as climate change, is the observed century-scale rise in the average temperature of the Earth’s climate system and its related effects. Carbon dioxide is a one of the Green House gas which cause global warming. Carbon dioxide is not produced by Global warming.
274. Which drug is used to cure Hypertension?

1. Risedronate
2. Diazepam
3. Folic Acid
4. Hydralazine

Option “D” is correct
Hydralazine is used to cure high blood pressure (hypertension).
275. For what is Mohs scale used?

1. To measure brightness of a substance
2. To measure viscosity of a liquid
3. To measure elasticity of a material
4. To measure hardness of minerals

Option “D” is correct
The Mohs scale of mineral hardness is a qualitative ordinal scale characterizing scratch resistance of various minerals through the ability of harder material to scratch softer material. Created in 1812 by German geologist and mineralogist Friedrich Mohs.
276. The nuclear force is –

1. Short range repulsive force
2. Short range attractive force
3. Long range repulsive force
4. Long range attractive force

Option “B” is correct
Nuclear forces are short range attractive forces that bound the nucleus against the repulsive electrostatic force between Protons.
277. Which of the following contain carbon?

1. Lignite
2. Tin
3. Silver
4. Iron

Option “A” is correct
Coal minerals are divided mainly into four types on the basis of the percentage of Carbon amount-
Peat – 40-55%, Lignite – 45-65%, Bituminous -65-85% and Anthracite – more than 85%.
278. What is Teflon?

1. Fluorocarbon
2. Hydrocarbon
3. Microbicides
4. Insecticide

Option “A” is correct
Polytetrafluoroethylene (PTFE) is usually known as Teflon. PTEF is a solid fluorocarbon. Its density is 2.2 g/cm3 and its melting point is 327°C. This is especially used for making a non-stick surface coating for utensils.
279. What is laughing gas?

1. Nitrous Oxide
2. Carbon monoxide
3. Sulphur dioxide
4. Hydrogen peroxide

Option “A” is correct
Nitrous Oxide is commonly known as laughing gas.
280. Polymer of Natural Rubber is-

1. Ethylene
2. Isoprene
3. Acetylene
4. Hexane

Option “B” is correct
Polymerization is the process of joining together a large number of small molecules to make a number of the very large molecule. Natural rubber is the natural polymer of Isoprene.
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178 thoughts on “Chemistry”

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