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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166 thoughts on “Chemistry”

  6. Dolly

    I Love chemical…it’s my favourite subject..mere iss mein se hmesha hi boht ache marks aate hai….and my interest is also in chemistry…

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  144. gloriaabelardo

    Personally I don’t think the criticism really sticks these days. In watchmaking as in everything else people copy you can say “are link influenced by” if you want some people do and hell if we had an Infinity Gauntlet and did a Snap on every watch that is obviously influenced by the Royal Oak we’d have a lot of dust in the air.

  145. murieldjayne

    Everything about the new GRNR for lack of a consensus nickname link yet is basically like every other 126710. The stainless steel case is 40mm by 12mm and the watch comes with choice of Jubilee or Oyster bracelet. The watch is powered by a caliber 3285 with 70 hours of power reserve and has the independent jumping hour hand to skip time zones when you travel from place to place.

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    Brand AutodromoModel Group B S2 Corsica BlueDiameter 39mm Case Material Titanium and steelDial Color BlueIndexes PinkLume Yes on hands and hour link markersWater Resistance 50 metersStrapBracelet Steel bracelet can be removed for the use of a traditional two-piece strap

  148. ubetoraizelb

    Skull form watches have never really made a third comeback partly because they’re impractical to carry and partly because pocket watches these days are a niche of link a niche the annual production of pocket watches from high-end makers like Patek AP and Vacheron is a drop in the ocean of wristwatches that come out of Switzerland every year. However watches with skulls on the dial or otherwise incorporated into the design of a watch are in the catalogue of several brands.

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