76. Teflon, the tough and fire resistant polymer, containing the halogen: Answer: Flourine
77. The glass used to make optical instruments:
Answer: Flint glass
78. Molish test is used to detect the presence of:
Answer: Carbohydrates
79. The acid used to make permanent writing on the surface of glass:
Answer: Hydrofluric acid
80. What is the full form of LPG?
Answer: Liquified Petroleum Gas
81. Cyclonite is also known as:
Answer: RDX
82. A non metal other than carbon which shows allotropy is:
Answer: Sulphur
83. The radio active isotope used to determine the activity of thyroid gland is:
Answer: Iodine-131
84. Camphor can be separated from sand by:
Answer: Sublimation
85. Which halogen is contained in DDT?
Answer: Chlorine
86. Smoke, fog and mist are examples of:
Answer: Aerosols
87. Iron that contains the highest percentage of carbon:
Answer: Pig Iron
88. Acidity in milk is caused by:
Answer: The activity of enzymes
89. Which element has the lowest melting point?
Answer: Helium
90. The element with the highest density:
Answer: Osmium
91. The lightest metal:
Answer: Lithium
92. The element with the highest boiling point:
Answer: Tungsten
93. Which element has the second highest density?
Answer: Iridium
94. The most abundant metal in human body:
Answer: Calcium
95. What percent of the atmosphere is Oxygen?
Answer: 20.95
96. What percent of the mass of human body is Oxygen?
Answer: 65
97. The most common element on the earth’s crust by mass:
Answer: Oxygen
98. The most abundant element in the moon:
Answer: Oxygen
99. Which metal has the highest melting point?
Answer: Tungsten
100. The most abundant metal in the whole earth:
Answer: Iron
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