General Knowledge :: General Science

General Knowledge  ::  General Science

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1.	Brass gets discoloured in air because of the presence of which of the following gases in air?
	A. Oxygen B. Hydrogen sulphide C. Carbon dioxide D. Nitrogen Answer: Option B

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2.	Which of the following is a non metal that remains liquid at room temperature?
	A. Phosphorous B. Bromine C. Chlorine D. Helium Answer: Option B

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3.	Chlorophyll is a naturally occurring chelate compound in which central metal is
	A. Copper B. Magnesium C. Iron D. Calcium Answer: Option B

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4.	Which of the following is used in pencils?
	A. Graphite B. Silicon C. Charcoal D. Phosphorous Answer: Option A

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5.	Which of the following metals forms an amalgam with other metals?
	A. Tin B. Mercury C. Lead D. Zinc Answer: Option B
6.	Chemical formula for water is
	A. NaAlO2 B. H2O C. Al2O3 D. CaSiO3 Answer: Option B

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7.	The gas usually filled in the electric bulb is
	A. nitrogen B. hydrogen C. carbon dioxide D. oxygen Answer: Option A

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8.	Washing soda is the common name for
	A. Sodium carbonate B. Calcium bicarbonate C. Sodium bicarbonate D. Calcium carbonate Answer: Option A

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9.	Quartz crystals normally used in quartz clocks etc. is chemically
	A. silicon dioxide B. germanium oxide C. a mixture of germanium oxide and silicon dioxide D. sodium silicate Answer: Option A

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10.	Which of the gas is not known as green house gas?
	A. Methane B. Nitrous oxide C. Carbon dioxide D. Hydrogen Answer: Option D

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11.	Bromine is a
	A. black solid B. red liquid C. colourless gas D. highly inflammable gas Answer: Option B

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12.	The hardest substance available on earth is
	A. Gold B. Iron C. Diamond D. Platinum Answer: Option C

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13.	The variety of coal in which the deposit contains recognisable traces of the original plant material is
	A. bitumen B. anthracite C. lignite D. peat Answer: Option D

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14.	Tetraethyl lead is used as
	A. pain killer B. fire extinguisher C. mosquito repellent D. petrol additive Answer: Option D

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15.	Which of the following is used as a lubricant?
	A. Graphite B. Silica C. Iron Oxide D. Diamond                            Answer: Option A

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16.	The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is
	A. Argon B. Xenon C. Helium D. Krypton Answer: Option C

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17.	The gases used in different types of welding would include
	A. oxygen and hydrogen B. oxygen, hydrogen, acetylene and nitrogen C. oxygen, acetylene and argon D. oxygen and acetylene Answer: Option D

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18.	The property of a substance to absorb moisture from the air on exposure is called
	A. osmosis B. deliquescence C. efflorescence D. desiccation Answer: Option B

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19.	In which of the following activities silicon carbide is used?
	A. Making cement and glass B. Disinfecting water of ponds C. cutting very hard substances D. Making casts for statues Answer: Option C

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20.	The average salinity of sea water is
	A. 3% B. 3.5% C. 2.5% D. 2% Answer: Option B

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21.	When an iron nail gets rusted, iron oxide is formed
	A. without any change in the weight of the nail B. with decrease in the weight of the nail C. with increase in the weight of the nail D. without any change in colour or weight of the nail Answer: Option C

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22.	Galvanised iron sheets have a coating of
	A. lead B. chromium C. zinc D. tin Answer: Option C

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23.	Among the various allotropes of carbon,
	A. coke is the hardest, graphite is the softest B. diamond is the hardest, coke is the softest C. diamond is the hardest, graphite is the softest D. diamond is the hardest, lamp black is the softest Answer: Option C

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24.	The group of metals Fe, Co, Ni may best called as
	A. transition metals B. main group metals C. alkali metals D. rare metals Answer: Option A

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25.	Heavy water is
	A. deuterium oxide B. PH7 C. rain water D. tritium oxide Answer: Option A

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26.	The chemical (ethyl mercaptan) added to the otherwise odourless LPG cooking gas for imparting a detectable smell to the gas is a compound of
	A. bromine B. fluorine C. chlorine D. sulphur Answer: Option D

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27.	The element common to all acids is
	A. hydrogen B. carbon C. sulphur D. oxygen Answer: Option A

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28.	Non stick cooking utensils are coated with
	A. Teflon B. PVC C. black paint D. polystyrene Answer: Option A

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29.	Monazite is an ore of
	A. titanium B. zirconium C. iron D. thorium Answer: Option D

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30.	Carbon, diamond and graphite are together called
	A. allotropes B. isomers C. isomorphs D. isotopes Answer: Option A

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31.	Potassium nitrate is used in
	A. medicine B. fertiliser C. salt D. glass Answer: Option B

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32.	Permanent hardness of water may be removed by the addition of
	A. sodium carbonate B. alum C. potassium permanganate D. lime Answer: Option A

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33.	Soda water contains
	A. carbonic acid B. sulphuric acid C. carbon dioxide D. nitrous acid Answer: Option C

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34.	The most important ore of aluminium is
	A. galena B. calamine C. calcite D. bauxite Answer: Option D

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35.	Most soluble in water is
	A. camphor B. sulphur C. common salt D. sugar Answer: Option D

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36.	Which of the following was to be discovered first in the chromospheres of the sun?
	A. Krypton B. Xenon C. Neon D. Helium Answer: Option D

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37.	Which of the following is in liquid form at room temperature?
	A. Lithium B. Sodium C. Francium D. Cerium Answer: Option C

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38.	Sodium metal is kept under
	A. petrol B. alcohol C. water D. kerosene Answer: Option D

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39.	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: Option D

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40.	From which mineral is radium obtained?
	A. Rutile B. Haematite C. Limestone D. Pitchblende Answer: Option D

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

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

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

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

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

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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: Option B

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

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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: 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: 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: 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: Option B

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60.	Which of the following is the lightest metal?
	A. Mercury B. Lithium C. Lead D. Silver Answer: Option B

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