CBSE Class 9 Science Is Matter Around us Pure MCQs Set E

Question: Which of these will exhibit the Tyndall effect?
a) A and D
b) B and C
c) A and B
d) D
Answer: d

Question: Which of the following is the correct set of apparatus for fractional distillation?
a) Round bottomed flask, thermometer, water condenser and beaker
b) Round bottomed flask, thermometer, air condenser and beaker
c) Round bottomed flask, thermometer, fractionating column, water condenser and flask
d) Round bottomed flask, thermometer, fractionating column, air condenser and flask
Answer: c

Question: Which of the following represents a chemical change?
a) Extraction of copper from copper pyrites
b) Distillation of water
c) Melting of wax
d) Dissolution of salt in water
Answer: a

Question: The sequence of steps for separating a mixture of salt, sand and camphor is:
a) Adding water, filtration, evaporation, sublimation
b) Adding water, filtration, sublimation, evaporation
c) Sublimation, adding water, filtration, evaporation
d) Sublimation, adding water, evaporation, filtration
Answer: c

Question: Which one is the colloidal solution among them?
a) C
b) D
c) B
d) A
Answer: b

Question: Different components can be separated from petroleum by:
a) FiltrationA
b) Chromatography
c) Simple distillation
d) Fractional distillation
Answer: d

Question: A mixture of oil and water can be separated by:
a) Sublimation
b) Crystallisation
c) Chromatography
d) Separating funnel
Answer: d

Question: In the separation of dyes A and B by chromatography, component B has more solubility in the solvent. Which component will rise faster?
a) A
b) B
c) Both at the same speed
d) Separation of dyes is independent of the solubility in solvent
Answer: b

Question: Which of these will form a clear and transparent solution:
a) A
b) B
c) A and B
d) B and D
Answer: c

Question: When a bottle of soda water is opened, carbon dioxide escapes, producing a fizz. This is due to:
a) Decrease in solubility on decreasing temperature
b) Decrease in solubility on increasing temperature
c) Decrease in solubility on decreasing pressure
d) Decrease in solubility on increasing pressure
Answer: c