General Science Elements Metals | General Knowledge Questions and Answers | General Knowledge Free Online-Tests | LucentBlackBoard

01.

Diamond is an allotropic form of:

A.	Silicon	B.	Sulphur
C.	Carbon	D.	Germanium

Answer and Explanation

Answer: Carbon

Explanation:
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02.

Among the various allotropes of carbon,

A.	diamond is the hardest, coke is the softest	B.	diamond is the hardest, graphite is the softest
C.	diamond is the hardest, lamp black is the softest	D.	coke is the hardest, graphite is the softest

Answer and Explanation

Answer: diamond is the hardest, graphite is the softest

Explanation:
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03.

Carbon, diamond and graphite are together called

A.	allotropes	B.	isomers
C.	isotopes	D.	isomorphs

Answer and Explanation

Answer: allotropes

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04.

Potassium nitrate is used in

A.	medicine	B.	fertiliser
C.	salt	D.	glass

Answer and Explanation

Answer: fertiliser

Explanation:
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05.

Permanent hardness of water may be removed by the addition of

A.	sodium carbonate	B.	alum
C.	potassium permanganate	D.	lime

Answer and Explanation

Answer: sodium carbonate

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06.

Soda water contains

A.	carbonic acid	B.	sulphuric acid
C.	carbon dioxide	D.	nitrous acid

Answer and Explanation

Answer: carbon dioxide

Explanation:
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07.

Which of the following is in liquid form at room temperature?

A.	Lithium	B.	Sodium
C.	Francium	D.	Cerium

Answer and Explanation

Answer: Francium

Explanation:
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08.

The main constituents of pearls are

A.	calcium oxide and ammonium chloride	B.	calcium carbonate and magnesium carbonate
C.	aragonite and conchiolin	D.	ammonium sulphate and sodium carbonate

Answer and Explanation

Answer: calcium carbonate and magnesium carbonate

Explanation:
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09.

Potassium Permanganate is used for purifying drinking water, because

A.	it is a sterilising agent	B.	it dissolves the impurities of water
C.	it is a reducing agent	D.	it is an oxidising agent

Answer and Explanation

Answer: it is an oxidising agent

Explanation:
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10.

What does soda water contains?

A.	Carbonic acid.	B.	Carbon dioxide.
C.	Nitrous acid.	D.	Sulphuric acid.

Answer and Explanation

Answer: Carbon dioxide.

Explanation:
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11.

Bell metal is an alloy of

A.	nickel and copper	B.	zinc and copper
C.	brass and nickel	D.	tin and copper

Answer and Explanation

Answer: tin and copper

Explanation:
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12.

Production of chlorofluorocarbons (CFC) gas which is proposed to be banned in India, is used in which of the following domestic products?

A.	Television	B.	Refrigerator
C.	Tube light	D.	Cooking gas

Answer and Explanation

Answer: Refrigerator

Explanation:
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13.

LPG consists of mainly

A.	methane, ethane and hexane	B.	ethane, hexane and nonane
C.	methane, hexane and nonane	D.	methane, butane and propane

Answer and Explanation

Answer: methane, butane and propane

Explanation:
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14.

Which of the following is the lightest metal?

A.	Mercury	B.	Lithium
C.	Lead	D.	Silver

Answer and Explanation

Answer: Lithium

Explanation:
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15.

Which of the following does not contain a coinage metal?

A.	Silver and Gold	B.	Zinc and Gold
C.	Copper and Silver	D.	Copper and Gold

Answer and Explanation

Answer: Zinc and Gold

Explanation:
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16.

From which mineral is radium obtained?

A.	Limestone	B.	Haematite
C.	Pitchblende	D.	Rutile

Answer and Explanation

Answer: Pitchblende

Explanation:
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17.

Which is the metal that pollutes the air of a big city?

A.	Lead	B.	Copper
C.	Chromium	D.	Cadmium

Answer and Explanation

Answer: Lead

Explanation:
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18.

Which of the following are the ingredients of gun metal?

A.	Iron, Zinc, Titanium	B.	Iron, tin
C.	Iron, Brass, Tin	D.	Copper, Tin

Answer and Explanation

Answer: Copper, Tin

Explanation:
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19.

In fireworks, the green flame is produced because of

A.	sodium	B.	barium
C.	mercury	D.	potassium

Answer and Explanation

Answer: barium

Explanation:
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20.

Marsh gas is

A.	nitrogen	B.	ethane
C.	methane	D.	hydrogen

Answer and Explanation

Answer: methane

Explanation:
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