R S Aggarwal General Science : Model Set-2

R S Aggarwal General Science MCQs for Railway Exam

MODEL SET -2
(Elements, Metals & Compounds)

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1) The filament of an electric bulb is made of
(a) iron (b) nichrome (c) tungsten (d) graphite

2) Bleaching powder is made from
(a) sulphur dioxide and gypsum
(b) chlorine and charcoal
(c) soda ash and lime
(d) lime and chlorine

3) The two elements that arc frequently used for making transistors arc
(a) boron and aluminium
(b) silicon and germanium
(c) iridium and tungsten
(d) niobium and columbium

4) Which of the following gases is not known as green house gas?
(a) Carbon dioxide       (b) Methane
(c) Nitrous oxide          (d) Chlorofluorocarbons
(e) Hydrogen

5) Match the following:
Element                    Symbol
a)Thallium                   1. Tm
b)Thorium                   2. Tl
c)Thulium                   3. Tb
d)Terbium                   4. Th
    A B C D                  A B C D
(a) 2 4 3 1                  (b) 2 4 1 3
(c) 4 2 1 3                  (d) 1 3 2 4

(6) Which of the following is not a neutral oxide?
(a) Carbon monoxide    (b) Sulphur dioxide
(c) Nitric oxide             (d) Water
(e) Nitrous oxide

(7) Titanium is purified by
(a) Zone reflning           (b) Electrolysis
(c) Van Arkel method    (d) Hydraulic washing

(8) Which of the following is used in making smoke bombs?
(a)Sulphur (b) Phosphorus (c) Hydrogen (d) Carbon

(9) Consider the following statements regarding graphite:
1) It is an allotrope of carbon.
2) It is a good conductor of heat and electricity.
3) It can be artificially produced.
Of these statements,
(a) 1, 2 and 3 arc correct.
(b) I and 2 are correct.
(c) 1 and 3 are correct.
(d) 2 and 3 are correct.

(10) Caustic soda is
(a) NaCl (b) Na₂Co₃ (c) NaOH (d) NaHCO₃

(11) Chemical formula for water glass is
(a) Na₂SiO₃ (b) Al₂O₃ (c) NaAlO₂ (d) CaSiO₃

(12) Which of the following Is not a bleaching agent?
(a) Sulphur dioxide        (b) Carbon dioxide
(c) Sodium hypochlorite (d) Chlorine

13) The gas usually filled in the electric bulb is
(a) hydrogen                 (b) oxygen
(c) nitrogen                   (d) carbon dioxide

14) Heavy water is
(a) tritium oxide            (b) deuterium oxide
(c) rain water                (d) water at -4⁰c

15) Ozone attacks
(a) mercury and silver   (b) copper
(c) silver and Iron         (d) glass
(e) None of these

16) The gases used in different types of welding would include
(a) oxygen and hydrogen
(b) oxygen, acetylene and argon
(c) oxygen and acetylene
(d) oxygen, hydrogen, acetylene and nitrogen

17) Arrange the following metals in the decreasing order of their relative abundance in earth’s crust after aluminium:
1. Calcium 2. Iron 3. Sodium 4. Magnesium
(a) 1, 4, 2, 3                 (b) 1, 2, 4, 3
(c) 2, 1, 3, 4                 (d) 2, 1, 4. 3

18) Which of the following alloys is used for making magnets?
(a) Duralumin (b) Stainless steel (c) Alnico (d) Magnesium

19) Match the following:
Alloy                                        Composition
(a)Bronze                     1. Lead, antimony, tin
(b)Brass                       2. Copper, zinc, nickel
(c)German silver           3. Copper, zinc
(d)Type metal               4. Copper, tin
     A B C D                         A B C D
(a) 1 4 3 2                    (b) 2 1 4 3
(c) 3 2 1 4                    (d) 4 3 2 1

20. Permanent hardness of water may be removed by the addition of
(a) alum                       (b) sodium carbonate
(c) lime                        (d) potassium permanganate

21. Which of the following is the lightest gas?
(a) Nitrogen (b) Hydrogen (c) Ammonia (d) Carbon dioxide

22. Potassium nitrate is used in
(a) salt (b) glass (c) fertiliser (d) medicine

23) In which type of rocks are metals like gold and copper mostly found?
a) Old igneous              (b) Old Sedimentary
(c) Old metamorphic     (d) New metamorphic

24. Which of the following gases is lighter than air?
(a) Carbon dioxide        (b) Oxygen
(c) Ammonia                (d) Chlorine

25. Which of the following metals remains in liquid form under normal conditions?
(a) Uranium (b) radium (c) zinc (d) Mercury (e)Titanium

26. Two or more forms of a chemical element having different physical properties but rising to identical chemical compounds are called
(a) Allotropes (b) Isotopes (c) Isomers (d) Isotones

27) Which of the following is not a compound?
(a) Silica (b) Red lead (c) Slaked lime (d) Black lead

28. Which of the following is used as a lubricant?’
(a) Graphite (b) Silica (c) Diamond (d) Iron oxide

29) The purest form of iron is
(a) steel (b) cast iron (c) pig iron (d) wrought iron

30) The percentage of carbon is the least in
(a) grey cast iron (b) wrought iron (c) white cast iron (d) steel

31) Emerald is … .in colour
(a) violet (h) yellow (c) deep green (d) Prussian blue

32) Which of the following metals was first discovered by man?
(a) Bronze (h) Silver (c) Iron (d) Copper

33. Marsh gas is
(a) hydrogen (b) nitrogen (c) methane (d) ethane

34. Carbon, diamond and graphite are together called
(a) isomers ( b) allotropes (c) isomorphs (d) isotopes

35) Galvanised iron sheets have a coating of
(a) tin (b) lead (c) zinc (d) chromium

36) Permanent hardness of water, due to sulphates of the metal, can be destroyed by the use of
(a) nitrates (b) zeolites (c) sulphonates (d) None of these

37) Which of the following is called a strategic metal?
(a) Silicon (b) Germanium (c) Titanium (d) Uranium

38) Rust is
(a) a mixture of Fe₂O₃ and Fe(OH)₃
(b) a mixture of FeO & Fe(OH)₂
(c) Fe₂O₃ only
(d) a mixture of Fe₂O₃.3H₂O and FeO

39. Among the various allotropes of carbon,
(a) diamond is the hardest, lamp black is the softest.
(b) diamond is the hardest, coke is the softest.
(c) coke is the hardest, graphite is the softest.
(d) diamond is the hardest, graphite is the softest.

40. Liquefied Petroleum Gas consists of mainly
(a) methane, ethane and hexane
(b) ethane, hexane and nonane
(c) methane, butane and propane
(d) methane, hexane and nonane

41) Which of the following gases is used as an illuminant in lamps used by hawkers?
(a) Methane (b) Ethylene (c) Acetylene (d) Hydrogen

42. The metal that is present in photo films is
(a) mercury  (b) platinum (c) magnesium (d) silver

43) Which of the following is in liquid form at room temperature?
(a) Cerium (b) Sodium (c) Francium (d) Lithium

44) Soda water contains
(a) nitrous acid             (b) carbonic acid
(c) carbon dioxide        (d) sulphuric acid

45. Which of the following is not an isotope of hydrogen?
(a) Protium (b) Yttrium (c) Deuterium (d) Trituim

46. Which one of the following is the basis of modem periodic table?
(a) Atomic mass           (b) Atomic number
(c) Atomic size             (d) Atomic volume

47) Brass is an alloy of
(a) nickel and copper    (b) zinc and copper
(c) nickel and zinc        (d) nickel and silver

48. Of the following metals which, one pollutes the air of a big city?
(a) Copper (b) Chromium (c) Lead (d) Cadmium

49. The element required for solar energy conversion is
(a) Beryllium (b) Silicon (c) Tantalum (d) Ultra-pure carbon

50) Which of the following is the correct sequence of the following elements in increasing order of their relative densities?
1. Mercury 2. Gold 3. Lead 4. Aluminium
(a) 3, 2, 1 ,4                 (b) 3, 1, 4, 2
(c) 4, 1, 3, 2                 (d) 4, 3, 1, 2

ANSWER

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  1-C  |    2-D  |    3-B  |    4-C  |    5-B  |    6-B  |   7-C  |   8-B  |    9-A  |  10-C   |  
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11-A  |  12-B   |  13-C  |  14-B  |  15-E  |  16-C  |  17-C  | 18-C  |  19-D  |  20-B   |
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21-B  |  22-D   |  23-A  |  24-C  |  25-D  |  26-A  |  27-D  | 28-A  |  29-D  |  30-D  |
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31-C  |  32-D   |  33-C  |  34-B  |  35-C  |  36-B  |  37-C  | 38-D  |  39-D  | 40-C  |
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41-C  |  42-D   |  43-C  |  44-C  |  45-B  |  46-B  |  47-B  |  48-C  |  49-B  |  50-D  |