A. Cadmium
B. Chromium
C. Lead
D. Copper
Answer –C. Lead
Explanation-
42. Which of the following is chiefly present in LPG (Liquefied Petroleum Gas) ? [SSC CPO Sub-Inspector 2003]
A. Methane
B. Ethane
C. Propane
D. Butane
Answer –D. Butane
Explanation-
43. What is the most commonly used substance in fluorescent tubes?[SSC CGL Prelim 2003]
A. Sodium oxide and argon
B. Sodium vapour and neon
C. Mercury vapour and argon
D. Mercury oxide and neon
Answer –C. Mercury vapour and argon
Explanation-
44. The major harmful gas emitted by automobile vehicle which causes air pollution is – [SSC CPO Sub-Inspector 2003]
A. Carbon Monoxide
B. Methane
C. Carbon dioxide
D. Ozone gas
Answer –C. Carbon dioxide
Explanation-
45. Galvanization is the : [SSC CGL Prelim 2002]
A. deposition of zinc on iron
B. deposition of tin on iron
C. deposition of copper on iron
D. deposition of aluminium on iron
Answer –A. deposition of zinc on iron
Explanation-
46. The acid used in lead storage cells is – [SSC CPO Sub-Inspector 2003]
A. phosphoric acid
B. hydrochloric acid
C. nitric acid
D. sulphuric acid
Answer –D. sulphuric acid
Explanation-
47. Galvanised iron is made by coating iron with [SSC CPO Sub-Inspector 2004]
A. Zinc
B. Nickel
C. Chromium
D. Sulphur
Answer –A. Zinc
Explanation-
48. Which of the following is not a precious/semi-precious stone?[SSC Section Officer (Commercial Audit) 2003]
A. Sapphire
B. Ruby
C. Pearl
D. Emerald
Answer –C. Pearl
Explanation-
49. The enzyme that converts glucose to ethyl alcohol is : [SSC CGL Prelim 2002]
A. Invertase
B. Maltase
C. Zymase
D. Diastase
Answer –C. Zymase
Explanation-
50. Bauxite is an alloy of which of the following metals ? [SSC Section Officer (Audit) 2003]
A. Aluminium
B. Silver
C. Tin
D. Iron
Answer –A. Aluminium
Explanation-
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