481. Which one of the following has the highest fuel value?

1. Hydrogen
2. Charcoal
3. Natural gas
4. Gasoline

Option “1” is correct.
The heating value of a fuel is the amount of heat that is obtained after one gram (1gm) of fuel is burnt completely in air or oxygen. Hydrogen has the highest heating value among all fuels. Hydrogen is used as a rocket fuel and in burner producing high temperature.
482. The main component of Liquid Petroleum Gas (LPG) are :

1. Methane, Ethane and Hexane
2. Methane, Pentane and Hexane
3. Propane and Butane
4. Methane, Carbon Monoxide and Hydrogen

Option “3” is correct.
LPG is the abbreviation or short form Liquefied Petroleum Gas. Like all fossil fuels, it is a non-renewable source of energy. It is extracted from crude oil and natural gas. The normal components of LPG thus are propane  and butane 
483. Which of the following is mainly used for the production of Aluminium?

1. Hematite
2. Lignite
3. Bauxite
4. Magnetite

Option “3” is correct.
Bauxite is an ore of Aluminum, which is found in the form of Hydrated Aluminium Oxides.
484. Solder used in soldering metal pieces consists of any alloy of:

1. Tin and Zinc
2. Tin and Lead
3. Tin, Zinc and Copper
4. Tin, Lead and Zinc

Option “2” is correct.
The common composition of solder is 32% Tin, 68% Lead. This combination has a low melting point and is useful for soldering components that are sensitive to heat.
485. Which of the following do not consist carbon?

1. Diamond
2. Graphite
3. Coal
4. None of these

Option “4” is correct.
Diamond is an additional form of Carbon. Its relative density is 3.5 Graphite is a slaty-black coloured smooth and brightly organic matter of relative density 2.25, while coal is a solid organic matter used as fuel. All the three are consist of carbon.
486. Which one of the following fuels causes minimum air pollution?

1. Kerosene oil
2. Hydrogen
3. Coal
4. Diesel

Option “2” is correct.
Hydrogen is the purest combustion fuel. Water is generated from burning of Hydrogen. While coal, kerosene oil and diesel are known as fossil fuel which generates, Carbon dioxide and many other harmful gases when it burns.
487. Which gas is used in the purification of drinking water?

1. Helium
2. Chlorine
3. Fluorine
4. Carbon Dioxide

Option “2” is correct.
Chlorine is presently an important chemical for water purification (such as in water treatment plants), disinfectants and in bleach.
488. In a car battery, electrolyte substance used is-

1. Hydrochloric acid
2. Sulphuric acid
3. Nitric acid
4. Distilled water

Option “2” is correct.
Electrolyte substance used in a car battery is Sulphuric acid  . It is a strong acid.
489. The energy, found in dry cell is-

1. Mechanic
2. Electric
3. Chemical
4. Electromagnetic

Option “3” is correct.
The best example of changing into electric energy from chemical energy is primary cells or batteries, the dry cell is also made up in this phenomenon.
490. A pungent smell often present near the urinals is due to-

1. Sulphur-di-oxide
2. Chlorine
3. Ammonia
4. Urea

Option “3” is correct.
Urine odour is caused by the presence of Ammonia. Urine is an aqueous solution of greater than 95% water.
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166 thoughts on “Chemistry”

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    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.

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    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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