51. Now-a-days yellow lamps are frequently used as street lights. Which of the following gases is used in these lamps?

1. Sodium
2. Neon
3. Hydrogen
4. Nitrogen

Option “A” is correct
Now-a-days yellow lamps are frequently used as street lights. Sodium gas are used as street lamp.
52. Burning pyrites ore gives out –

1. Carbon dioxide gas
2. Sulphur dioxide gas
3. Nitrogen dioxide gas
4. Nitric oxide gas

Option “B” is correct
The mineral pyrite, or iron pyrite, is an iron sulphide with the molecular formula Pyrite is used in commercial production of sulphur dioxide, for use in the paper industry and in the manufacture of sulphuric acid.
53. Which one of the following fuels causes minimum air pollution?

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

Option “B” 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.
54. Which gas is used in the purification of drinking water?

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

Option “B” is correct
Chlorine is presently an important chemical for water purification (such as in water treatment plants), disinfectants and in bleach.
55. Which of the following is a fossil fuel?

1. Alcohol
2. Ether
3. Water gas
4. Natural gas

Option “D” is correct
Fossil fuels, including coal, oil and natural gas are currently the world’s primary energy sources.
56. Which one of the following pairs is not correctly matched?

1. Ascorbic acid – Lemon
2. Maltose – Malt
3. Acetic acid – Curd
4. Formic acid – Red Ant

Option “C” is correct
Lactic acid is found in curd not Acetic acid. Formic acid occurs in the body of red ants and in the stings of bees.
57. What is the largest component of lower atmosphere, by total volume?

1. Oxygen
2. Nitrogen
3. Helium
4. Water Vapour

Option “B” is correct
By volume, Nitrogen is the largest component of the lower atmosphere.
58. Acetic Acid is another name for which of the following?

1. Vinegar
2. Baking Soda
3. Copper Sulphate
4. Magnesium Oxide

Option “A” is correct
Acetic acid is also known as vinegar.
59. The reaction of Copper Sulphate and Iron produces Iron Sulphate and __________.

1. Vinegar
2. Ash
3. Baking Soda
4. Copper

Option “D” is correct
The reaction of Copper Sulphate and Iron produces Iron Sulphate and Copper. It is a single displacement reaction.
60. A __________ thread is actually stronger than a steel wire.

1. Wool
2. Cotton
3. Jute
4. Nylon

Option “D” is correct
Nylon is an artificial fibre. It has high tensile strength, stiffness, excellent heat deflection temperature, and superior abrasion and wear resistance. Nylon thread is actually stronger than a steel wire.
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166 thoughts on “Chemistry”

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    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.

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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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