“The Knowledge Library”

Knowledge for All, without Barriers…

An Initiative by: Kausik Chakraborty.

“The Knowledge Library”

Knowledge for All, without Barriers……….
An Initiative by: Kausik Chakraborty.

The Knowledge Library

General Science: Questions and Answers : Part-4

91. CaSO₄.2H₂O is the chemical formula of
(a) Gypsum (b) Plaster of Paris
(c) Caustic Soda (d) Baking Soda
Answer:( a)

92. The elements in the 17th  group of the modern periodic table are also known as
(a) Halogens (b) Noble Gases
(c) Transition Elements (d) Alkaline Earth Metals
Answer:(a )

93. The most abundant element in the universe is
(a) Helium (b) Hydrogen
(c) Nitrogen (d) Oxygen
Answer:( b)

94. The molecular formula of Baking Soda is
(a) Na₂CO (b) NaOH
(c) NaCl (d) NaHCO₃
Answer:( d)

95. Sodium Carbonate is generally prepared by
(a) Castner- Kellner Process (b) Contact Process
(c) Solvay Process (d) Haber Process
Answer:(c )

96. Which of the following is not a greenhouse gas?
(a) Water vapour (b) Hydrogen
(c) Ozone (d) Chlorofluorocarbon
Answer:(b )

97. Green Chemistry deals with
(a) Production of green coloured dyes
(b) reduction in the production of pollutants
(c) reduction in the time of chemical synthesis
(d) enhanced production in agriculture
Answer:(b )

98. Minamata disease is caused due to the poisoning of
(a) Cadmium (b) Arsenic
(c) Mercury (d) Zinc
Answer:( c)

99. International Mole day is celebrated on
(a) September 23 (b) October 23
(c) November 23 (d) December 23
Answer:(b )

100. Modern periodic table contains
(a) 7 groups and 18 periods
(b) 18 groups and 7 periods
(c) 8 groups and 17 periods
(d) 17 groups and 8 periods.
Answer:( b)

101. The excretory organ of Amoeba:
(a) Kidney (b) Malpigean tubes
(c) Contractive vacuole (d) Nephridia

102. Blood of Snail is …… in colour:
(a) Red (b) Blue (c) Green (d) Yellow

103. The tendency of plants to grow towards the direction of gravitational force:
(a) Geotropism (b) Phototropism
(c) Chemotropism (d) None of these

104. The rate of photosynthesis is highest in ….. light:
(a) Yellow (b) Blue (c) Green (d) Red

105. Wax is soluble in:
(a) Benzene (b) Water (c) Alcohol (d) Iodine

106. ___________ is the mineral from which the metal is conveniently and economically extracted.
Ans: Ore

107. Iron coated with tin is called _________
 Ans: Tin plate

108. Who wrote the book De re Metallica?
 Ans: Georg Agricole

109. Bauxite and Cryolite are the main ores of ____________
Ans: Aluminium

110. Sulphide ores are purified by _____________ process.
Ans: Froth Hoatation

111. _________ is the process of heating the ore below its melting point in the absence of air to remove volatile impurities.
Ans: Calcination

112. _________ is the impurity present in the ore.
Ans: Gangue

113. Most abundant metal present in developed animals.
 Ans: Calcium

114. The atmosphere mainly consists of ________
Ans: Nitrogen

115. __________ is the central portion of earth.
Ans: Core

116. Most abundant metal present in blood is __________
Ans: Potassium

117. The elements which lose electrons in chemical reaction are called _________
Ans: Metals

118. _________ is the best conductor of heat and electricity.
Ans: Silver

119. _________ is the king of metals.
 Ans: Gold

120. _________ is the metal having the lowest melting point.
Ans: Mercury

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