CET MCQ questions and answers Polytechnic 2015-2016 (Part13)

121. Green house effect can be minimised by :

• a) Pisciculture
• b) Agriculture
• c) Silviculture
• d) All these three

122. Oxidation is the process in which a substance:

• a) Gains hydrogen
• b) Gains oxygen
• c) Gains electrons
• d) None of these

123. What is a reaction in which one substance is oxidised and other is reduced is known as :

• a) Oxidation reaction
• b) Reduction
• c) Redox-reaction
• d) Reducing agent

124. Which of the following did not disturb the equilibrium point ?

• a) Catalyst
• b) temerature
• c) Pressure
• d) Concentration

125. Which of the following turns red litmus blue:

• a) Acids
• b) Bases
• c) Salts
• d) None of these

126. Which of the following salt solution is neutral:

• • a) NaCl

• b) NH₄Cl
• c) CH₃COONa
• d) CaO₂Cl₂

127. which of the following is a dry ice:

• a) Ice
• b) Solid SO₂
• c) Solid CO₂
• d) NaCl

128. Which of the following non-metals is a good conductor of electricity ?

• a) Graphite
• b) Iodine
• c) Diamond
• d) Dromine

129. Sulphide ores of copper are separated from the gangue prticles by using:

• a) Hydraulic washing
• b) Froth floatation process
• c) Electromagnetic separation
• d) Chemical separation

130. Helium is used in balloons instead of hydrogen because :

• a) it is lighter than hydrogen
• b) it is non combustible
• c) In comprison to hydrogen, it is found in abundance
• d) It is radioactive, therefore, can be easily detected