1. In a freezer ice cubes will be formed more quickly in trays made of -
Correct : C. aluminium
2. Who discovered X-rays?
Correct : A. W. C. Roentgen
3. The important metal used with iron to produce stainless steel is –
Correct : B. Chromium
4. Which of the following is an Inert Gas?
Correct : D. Argon
5. Which one of the following metals does not form amalgam?
Correct : D. Iron
6. Ozone layer in the upper parts of the atmosphere serves as a protective shield against harmful
Correct : A. solar ultraviolet radiation
7. Which of the following is Colourless?
Correct : B. Oxygen
8. The two metal ions that cause hardness to water are:
Correct : A. Calcium, Magnesium
9. The liquid waste from kitchens and baths, of residences is known as:
Correct : C. Sullage
10. Which one of the following is an example of a gel?
Correct : C. Face cream
11. Quartz is made of –
Correct : D. Sodium Silicate
12. Which among the following coal contains 90 per cent of carbon?
Correct : A. Anthracite
13. Eposure to mixtures of chemicals are greater than expected on the basis of effects of expo-sure to each chemical individually. This is known as –
Correct : C. Synergism
14. The filter over which sewage is sprinkled is called as –
Correct : A. Trickling filter
15. Which of the following is an iron ore?
Correct : B. Magnetite
16. Iodine value is used to estimate –
Correct : C. Unsaturation in oil
17. Element 106 was discovered by –
Correct : B. Seaborg
18. Milk of magnesia is an example of a/an
Correct : B. Base
19. A bee-sting leaves an acid which causes pain and irritation.
Correct : D. citric acid
20. Earth's atmosphere is an envelope of gases extending to a height of –
Correct : C. 200 km
21. In its reaction with silver nitrate, C2H2 shows –
Correct : D. Acidic property
22. Iron is extracted from -
Correct : B. Haematite
23. Which of the following imparts a blue colour to glass?
Correct : A. Cobalt oxide
24. Of the following, which one pol-lutes the air of a big City?
Correct : C. Lead
25. Wood spirit is –
Correct : A. Methyl alcohol
26. Which one of the following petroleum refinery products has the lowest boiling point?
Correct : D. Lubricating oil
27. Liquid metal is -
Correct : A. Mercury
28. Which of the following is used for removing air bubbles from glass during its manufacture?
Correct : B. Arsenic oxide
29. The fat of a common mussel-secretes a sticky glue that can be used to make heart implants. The unique chemical compound present in the glue is:
Correct : D. Dihydroxy phenyl alanine
30. Nitrogen is an essential constituent of all:
Correct : B. Proteins
31. Thissubstance is commonly used in the kitchen for making tasty crispy pakoras and is sometimes added for faster cooking. Which of the following is it?
Correct : A. Baking soda
32. Ferrous sulphate is used in water treatment as a/an -
Correct : C. Coagulant aid
33. Philosopher's Wool is -
Correct : C. Zinc oxide
34. The process by which milk is converted to curd is called –
Correct : C. Fermentation
35. The technique of calculating the age of fossil organisms is -
Correct : A. Radiocarbon dating
36. Of the following which one pollutes the air of a big city?
Correct : C. Lead
37. "Fire-fighting clothes" are made from
Correct : B. Asbestos
38. Hydrofluoric acid is not kept in glass bottles because it reacts with -
Correct : B. silicon dioxide of glass
39. One light year is equal to -
Correct : B. 9.46x 10¹7m
40. Which gas is used in fire extinguishers?
Correct : A. Carbon dioxide
41. Combustion of a candle is a/an -
Correct : D. exothermic reaction
42. Another name for baking soda is :
Correct : A. Sodium bicarbonate
43. Who invented the modern Periodic table?
Correct : B. Mendeleev
44. Brass is an alloy of -
Correct : D. Zinc and Copper
45. "Bhopal gas tragedy" 1984 is related to
–
Correct : C. Methyl isocyanate
46. The percentage of nitrogen present in ammonium sulphate is –
Correct : A. 27%
47. Surface water is a better source of drinking water because it is poor in -
Correct : C. Arsenic
48. Saturated hydrocarbons are called -
Correct : C. Alkanes
49. Which one of the following elements is polyatomic?
Correct : C. Sulphur
50. Which of the following is not a chemical reaction?
Correct : C. Conversion of water into steam
51. Which type of fire extinguisher is used for petroleum fire?
Correct : A. Foam type
52. The function of skimming tank in sewage treatment is to remove –
Correct : A. oil and fatty substances
53. Who discovered Oxygen?
Correct : A. Carl Scheele
54. Which one among the following is used as a moderator in nuclear reactors?
Correct : D. Heavy water
55. Which one of the following is used as preservative for foodstuff?
Correct : A. Sodium Benzoate
56. The element with highest first ionization energy is -
Correct : B. helium
57. The chief source of naphthalene is –
Correct : A. Coal-tear
58. KMnO4 can be used as a/an -
Correct : D. disinfectant
59. Seaweeds are important source of –
Correct : D. iodine
60. The resources which can be used continuously, year-after-year are called –
Correct : D. Renewable
61. Match sticks are made of -
Correct : A. Red phosphorus
62. Newlands' table, the elements were placed with the halogens -
Correct : D. Co and Ni
63. Iron rusts quickly in –
Correct : B. Sea water
64. Aerated water contains –
Correct : D. CO2
65. In electro-refining, the pure metal is deposited on –
Correct : C. cathode
66. Natural rubber is a polymer of –
Correct : C. Isoprene
67. Which among the following is used as a catalyst in the production of high octane fuels?
Correct : B. H2SO4
68. Th effect or response produced by two or more chemicals are less than the sum of the effects or response that the chemical would produce individually is known as -
Correct : A. Antagonism
69. Which metal is the heaviest in periodic table among the following?
Correct : A. Os
70. The chemical formula of the laughing gas is –
Correct : B. N2O
71. Radioactive elements emit –
Correct : D. α, β and γ radiations
72. Which one out of the following helps in burning?
Correct : A. Oxygen
73. Which one of the following is a mixture of carbon monoxide and hydrogen?
Correct : C. water gas
74. Which of the following elements has the lowest melting point?
Correct : A. Bromine
75. The chemical substance present in bones and teeth is -
Correct : A. Calcium phosphate
76. The percentage of carbon in cost iron is
Correct : D. 3 to 5
77. The compound that has the least value for octane number is –
Correct : D. n-heptane
78. Which of the following is a correct pair according to increasing atomic number from left to right?
Correct : B. Be, B
79. The gas causing acid rain in an industrial area is -
Correct : C. Sulphur dioxide
80. Which one of the following has greatest mass?
Correct : C. neutron
81. A colloidal system in which a liquid is dispersed in a liquid is called –
Correct : B. emulsion
82. When a lead storage battery is discharged -
Correct : D. Sulphuric acid is consumed
83. Chemically fats and oils are:
Correct : A. Triesters
84. Atomic number of which of the following elements is greater than that of Fluorine?
Correct : A. Sodium
85. Which of the following is a Synthetic rubber?
Correct : C. Neoprene
86. Washing soda is the common name of-
Correct : C. Sodium Carbonate
87. Which one of the following is known as the 'brown coal'?
Correct : D. Lignite
88. Maximum permissible concentration of copper in drinking water in mg/L, is –
Correct : C. 1.0
89. Oxygen has (+) oxidation number only in –
Correct : A. OF2
90. Which one of the following elements is used in the manufacture of fertilizers?
Correct : B. Potassium
91. Select the one which is not a mixture –
Correct : D. Distilled water
92. When Hydrogen starts burning in air, it produces?
Correct : B. Water
93. Carbon occurs in nature in the purest form as -
Correct : A. Diamond
94. In an oxygen molecule, two atoms are united by -
Correct : B. two bonds
95. The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing is –
Correct : D. Helium
96. Rectified spirit is :
Correct : A. 95% ethyl alcohol
97. Nylon is made up of :
Correct : A. Polyamide
98. Which is a natural colloid?
Correct : D. Blood
99. Which one of the following does not contain Silver?
Correct : C. German Silver
100. Which of the following auto mobile gases is not considered to be an air pollutant?