43000+ Important MCQs for SSC CGL

The given principle is one of the postulates of the Dalton’s atomic theory given in 1803 by John Dalton. The postulates of Dalton’s atomic theory are as follows:
1. Elements consist of indivisible small particles (atoms).
2. All atoms of the same element are identical; different elements have different types of atom.
3. Atoms can neither be created nor destroyed.
4. ‘Compound elements’ (i.e. Compounds) are formed when atoms of different elements join in simple ratios to form ‘compound atoms’ (i.e. Molecules).

Sodium benzoate is added to soft drinks as preservative. Benzene in soft drinks is of potential concern due to the carcinogenic nature of the benzene molecule. The major cause of benzene in soft drinks is the decarboxylation of benzoic acid in the presence of ascorbic acid (vitamin c). Other factors that affect the formation of benzene are heat and light. Storing soft drinks in warm conditions speed up the formation of benzene.

The oil which contains sulphur amount less than 0.5% is called Sweet Crude Oil. If the Sulphur content is more than 0.5%, it will be called Sour Crude Oil. The Brent crude oil is having around 0.37% Sulphur and that is why Brent Crude Oil is a Sweet crude Oil. Sweet Crude Oil is of High quality, low sulphur crude oil used for processing of gasoline. The more amount of Sulphur in sour crude makes it toxic, and production of Gasoline is more expensive in case of sour crude. The word “sweet” since a gently sweet taste and pleasing aroma due to the little level of Sulfur gives the oil with. The Brent Crude Oil is a sweet crude oil mainly produced in North Sea. It is largest of the several key classifications of crude oil comprising of Ekofisk, Brent Crude, Forties, Brent Sweet Light Crude and Oseberg. Its manufacturer also known as London Brent, Brent petroleum and Brent Blend.

Copper sulphate is used as an algicide for algal growth is copper sulfate. Ozone or Hydrogen peroxide is added to oxidise organic compounds, and thus reduce the amount of coagulant required. Fluoride is a naturally occurring mineral in water and many foods. In addition, fluoride is intentionally added to the public water supplies, because it has been demonstrated that communities with fluoride added to their water supplies have significantly reduced incidence of tooth decay in children. Fluoride makes teeth more resistant to the acid formed by bacteria in the mouth by preventing these acids from removing essential minerals from the tooth surface. Fluoride also helps to repair damaged tooth enamel.

The immediate product of the Iron alloy found in mines is “Pig iron”. Pig Iron has a very high Carbon Content (3.5-4.5%). So it is Brittle, Non-malleable and used only in limited applications. Iron alloy which has impurity more than 2.1% but less than the Pig Iron is called “Cast Iron”. They are mostly brittle but there are Malleable Cast Irons. The Cast Iron because of more impurities has a lower melting point. Historically cast Iron has been used in “Bridge making” all over the word. The famous “Iron Bridge” of England is made up of Cast Iron. “Wrought iron” has very low carbon content. It is also known as “Slag’. When it is bent to the point of breaking, it gives texture which resembles wood. Wrought Iron was earlier known as “Pure Iron”, but not now because; now the Iron, which has less than 0.008% impurity is considered to be commercially pure. The “Eiffel Tower “is made up of Wrought Iron.