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Problem Solving Assessment(PSA)

Question-1
The size of the colloidal particle is in the range of

(A) 1 Å to 100 Å	(B) 1nm to 100 nm
(C) 10^-9 m to 10^-7 m	(D) 10^-9cm to 10^-7cm

Question-2
The denser particles are forced to the bottom and the lighter particle stay at the top when spun rapidly.The principle is

(A) Centrifugation	(B) Evaporation
(C) Condensation	(D) Cooling

Question-3 The Brownian movement in colloids is due to :

(A) Tyndall effect	(B)Charge on colloidal solution
(C)Collisions between colloidal particles and with dispersion medium	(D)All of these

Question-4 Which of the following is correctly matched?

(A) Chromatography (Method) Plant pigments (Mixture)	(B)Distillation (Method) Copper sulphate and water (Mixture)
(C)Separating funnel (Method) Ammonium chloride and camphor (Mixture)	(D)Sublimation (Method) Kerosene oil and water (Mixture)

Question-5
The amount of solute present in a given amount of solution is called its

(A) Density	(B) Concentration
(C) Mass	(D) Fluidity

Question-6
A homogeneous mixture of two or more substances is called

(A) Solvent	(B) Solute
(C) Solution	(D) Soil

Question-7
Fog is an example of

(A) Aerosol	(B) Foam
(C) Emulsion	(D) Sol

Question-8 Who was the first person to use the term element?

(A) Robert Boyle	(B)Lavoisier
(C)Dalton	(D)Charle's

Question-9
Uniform composition is for

(A) Homogeneous mixture	(B) Heterogeneous mixture
(C) Colloids	(D) Suspensions

Question-10
It is used for the purification of salt that we get from sea water.

(A) Distillation	(B) Evaporation
(C) Condensation	(D) Crystallisation

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Std 9

CBSE

Practice in Related Chapters
Matter In Our Surroundings
Is Matter Around Us Pure
Atoms And Molecules
Structure Of The Atom