Elements and Metals Science MCQS 41 TO 63

            Elements and Metals Science MCQS 41 TO 63

41.	What is laughing gas?
	A. Nitrous Oxide B. Carbon monoxide C. Sulphur dioxide D. Hydrogen peroxide Answer & Explanation Answer: Option A

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42.	Actinides are the elements with atomic numbers from
	A. 97 to 104 B. 101 to 115 C. 89 to 103 D. 36 from 43 Answer & Explanation Answer: Option C

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43.	The two elements that are frequently used for making transistors are
	A. boron and aluminium B. silicon and germanium C. iridium and tungsten D. niobium and columbium Answer & Explanation Answer: Option B

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44.	The filament of an electric bulb is made of
	A. tungsten B. nichrome C. graphite D. iron Answer & Explanation Answer: Option A

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45.	Diamond is an allotropic form of
	A. germanium B. carbon C. silicon D. sulphur Answer & Explanation Answer: Option B

46.	In fireworks, the green flame is produced because of
	A. sodium B. barium C. mercury D. potassium Answer & Explanation Answer: Option B

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47.	Permanent hardness of water can be removed by adding
	A. chlorine B. washing soda C. potassium permanganate D. bleaching powder Answer & Explanation Answer: Option B

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48.	Marsh gas is
	A. nitrogen B. ethane C. methane D. hydrogen Answer & Explanation Answer: Option C

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49.	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 & Explanation Answer: Option D

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50.	Air is a/an
	A. compound B. element C. electrolyte D. mixture Answer & Explanation Answer: Option D

51.	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 & Explanation Answer: Option B

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52.	Balloons are filled with
	A. nitrogen B. helium C. oxygen D. argon Answer & Explanation Answer: Option B

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53.	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 & Explanation Answer: Option B

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54.	Which metal pollute the air of a big city?
	A. Copper B. Chromium C. Lead D. Cadmium Answer & Explanation Answer: Option C

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55.	Bell metal is an alloy of
	A. nickel and copper B. zinc and copper C. brass and nickel D. tin and copper Answer & Explanation Answer: Option D

56.	Water is a good solvent of ionic salts because
	A. it has a high specific heat B. it has no colour C. it has a high dipole moment D. it has a high boiling point Answer & Explanation Answer: Option C

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57.	Which of the following is not an isotope of hydrogen?
	A. Tritium B. Deuterium C. Protium D. Yttrium Answer & Explanation Answer: Option D

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58.	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 & Explanation Answer: Option B

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59.	Amalgams are
	A. highly coloured alloys B. alloys which contain mercury as one of the contents C. alloys which have great resistance to abrasion D. alloys which contain carbon Answer & Explanation Answer: Option B

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60.

Which of the following is the lightest metal?

A. Mercury B. Lithium C. Lead D. Silver Answer & Explanation Answer: Option B 61.  Which of the following metals remain in liquid for under normal conditions? A. Radium B. Zinc C. Uranium D. Mercury Answer & Explanation Answer: Option D 62.  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 & Explanation Answer: Option D 63.  Which of the following is an element? A. Ruby B. Sapphire C. Emerald D. Diamond Answer & Explanation Answer: Option D

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