Quiz 5- Chemistry-General Science: General Knowledge Question & Answers

41 Q) Which one of the following is the softest?

(a) Sodium

(b)Iron

(c) Aluminium

(d)Copper

Show Answer

A

42 Q) Ethanol mixed petrol is being sold invarious states wef January 1, 2003. The percentage of ethanol in petrol is

(a) 10%

(b) 7%

(c) 6%

(d) 5%

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D

43 Q) A polymer which is used for making ropes and carpet fibres is

(a) polyacetylene

(b) polypropylene

(c) polyacrylonitrile

(d) PVC

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B

44 Q) Which one among the following salts causes hardness to the water?.

(a)Calcium bicarbonate

(b)Calcium carbonate

(c)Sodium sulphate

(d)Potassium chloride

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A

45 Q) Why is the meat preserved in the brine solution is not spoil as quickly as fresh meat?

(a)The bacteria will fall victim to osmosis and shrivel up and die

(b)The brine solution makes the meat acidic, so growth of bacteria is prevented

(c)The brine solution is an unfavourable medium for the reproduction of bacteria

(d)None of the above

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A

46 Q) Assertion (A) Phenol is used for the manufacture of bakelite. 

 Reason (R) Bakelite is heat resistant thermosetting plastic used for making electric switches and switch board.

(a)Both A and R are true and R is the correct explanation of A

(b)Both A and R are true but R is not the correct explanation of A

(c)A is true but R is false

(d)A is false but R is true

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B

47 Q) "Consider the following statements

 I. Washing soda is used as a water softener. 

II. Saltpeter is used for heat transfer in solar power plants. 

Which of the statements given above is/are correct?"

(a) Only I

(b) Only II

(c) Both I and II

(d) Neither I nor II

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C

48 Q) "Consider the following substances.

I. Cadmium 

 II. Boron 

 III. Nickel 

 Which of the substances given above is/are used as controlling rod in nuclear reactor? "

(a) All of these

(b) I and II

(c) II and III

(d) Only II

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B

49 Q) "Assertion (A) In the alkali metals, potassium is the second lightest element in the group. 

Reason (R) Potassium imparts yellow colour to the flame."

(a)Both A and R are true and R is the correct explanation of A

(b)Both A and R are true but R is not the correct explanation of A

(c)A is true but R is false

(d)A is false but R is true

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C

50 Q) Consider the following statements 

I. Jet fuel is a mixture of a large number of different hydrocarbons. 

II.Kerosene-type jet fuel (Jet A and Jet A-1) has a carbon number between 8 and 16.

III.Naphtha-type jet fuel (including Jet B), has carbon numbers between 5 and 15. Which of the statements given above is/are correct?

(a)I, II and III

(b) I and III

(c) II and III

(d) Only II

Show Answer

A