41. One carbon credit is equivalent to:

1. 10 kg of CO2
2. 100 kg of CO2
3. 1000 kg of CO2
4. 10000 kg of CO2

Option “C” is correct
The idea for carbon credits came from the Kyoto Protocol of 1997. This is placing a monetary value on the cost of polluting the air. A single carbon credit generally emits one metric ton(1,000 kg or 2,204 pounds) of carbon dioxide or the equivalent mass of another greenhouse gas.
42. Assertion (A): Detergent easily removes oil and dirt from dirty garments.
Reason (R) : Detergent increases the surface tension of water.
Code :1. Both (A) and (R) are true and (R) is the correct explanation of (A)
2. Both (A) and (R) are true but (R) is not the correct explanation of (A)
3. (A) is true but (R) is false
4. (A) is false but (R) is true
Option “C” is correct
Detergent easily removes oil and dirt from dirty garment as the surface tension of water is dramatically reduced by the addition of soap or detergent.
43. Percentage of Silver in German Silver is:

1. 1%
2. 5%
3. 0%
4. None of these

Option “C” is correct
German Silver or Nickel silver is an alloy consisting 50% Copper, 35% Zinc and 15% Nickel. It doesn’t have silver.
44. Which one of the following is used in the manufacture of soaps?

1. Vegetable oil
2. Mobil oil
3. Kerosene oil
4. Cutting oil

Option “A” is correct
Soap is a combination of animal fat or plant oil and caustic soda. Many vegetable fats including olive oil, palm kernel oil and coconut oil are also used in soap making.
45. Milk openly placed for sometime becomes sour due to-

1. Carbonic acid
2. Lactic acid
3. Citric acid
4. Acetic acid

Option “B” is correct
Milk contains a sugar called lactose. It also contains harmless bacteria called lactobacillus, which uses glucose for energy and creates lactic acid as a by-product. It is the lactic acid which makes the milk sour. The presence of lactic acid or lactate in milk is due to the fermentation of lactose caused mainly by lactic bacteria.
46. Which one of the following substances is used in the preservation of food stuff?

1. Citric Acid
2. Potassium Chloride
3. Sodium Benzoate
4. Sodium Chloride

Option “C” is correct
The chemical formula of Sodium Benzoate is NaC7H5O2. It is widely used as food preservative.
47. ‘Humus’ is an example of-

1. Soil structure
2. Crystalloids
3. Organic colloids
4. None of the above

Option “C” is correct
Humus usually refers to the natural decay of material such as leaves in the soil’s top layer. It is a dark organic material that forms in the soil when plant and animal matter decays.
48. Which of the following chemicals is used in foam fire extinguishers?

1. Aluminium sulphate
2. Copper sulphate
3. Cobalt sulphate
4. Nickel sulphate

Option “A” is correct
Aluminium sulphate is used in ‘foam’ fire extinguishers, which contains radium bicarbonate and aluminium sulphate in separate receptacles on being mixed they form the foam of bubbles of CO2.
49. The predominant organic acid in grapes is-

1. Formic acid
2. Benzoic acid
3. Lactic acid
4. Tartaric acid

Option “D” is correct
Tartaric acid is the predominant organic acid in grapes.
50. In the case of rusting, the weight of iron-

1. Increases
2. Decreases
3. Remains the same
4. Uncertain

Option “A” is correct
Due to rust, the weight of Iron increases as Iron is converted into-oxide after chemical reaction with Oxygen, in presence of humidity.
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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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