Here are the shadows of some 3-D objects, when seen under the lamp of an overhead projector. Identify the solid(s) that match each shadow. (There may be multiple answers for these!)

A bulb is kept burning just right above the following solids. Name the shape of the shadows obtained in each case. Attempt to give a rough sketch of the shadow. (You may try to experiment first and then answer these questions).

A bulb is kept burning just right above the following solids. Name the shape of the shadows obtained in each case. Attempt to give a rough sketch of the shadow. (You may try to experiment first and then answer these questions).

A bulb is kept burning just right above the following solids. Name the shape of the shadows obtained in each case. Attempt to give a rough sketch of the shadow. (You may try to experiment first and then answer these questions)

Column - I and Column - II contains four emtries each. Entries of Column -I are to be matched with some entries of Column - II . One or more than one entries of Column -I may have the matching with the same entries of Column - II. {:("column-I","column-II"),("(A) Liquid dispersed in gas","(P) foam "),("(B) Gas dispersed in liquid ",(Q) " Emulsion"),("(C) Liquid dispersed in solid ","(R) Aerosol "),("(D) Liquid dispersed in liquid ","(S) Gel "):}

Column - I and Column - II contains four emtries each. Entries of Column -I are to be matched with some entries of Column - II . One or more than one entries of Column -I may have the matching with the same entries of Column - II. {:("column-I","column-II"),((A) As_(2)S_(3) "sol" ,"(P) Lyophobic colloid"),("(B) sulphur sol ",(Q) " Macromolecualr colloid"),("(C) starch","(R) Multimolecular colloid "),("(D)Soap","(S) Associated colloid "):}

Column - I and Column - II contains four emtries each. Entries of Column -I are to be matched with some entries of Column - II . One or more than one entries of Column -I may have the matching with the same entries of Column - II. {:("column-I","column-II"),("(A) peptization ","(P) preparation of sols "),("(B) Ultra centrifugation ",(Q) " Purification of sols "),("(C) Electrodialysis","(R) perparation of metal sols "),("(D) Breding's arc method ","(S) movement of ions acress the membrane in prsence of electric field "):}

Column - I and Column - II contains four entries each. Entries of Column -I are to be matched with some entries of Column - II . One or more than one entries of Column -I may have the matching with the same entries of Column - II. {:("column-I","column-II"),((A)" Chemisorption",(P)" Exothermic"),((B)" Physical adsorption",(Q)" Endoothermic "),((C)" Desorption",(R)" Removal of adsorbed material"),((D)" Activation of adsorbent",(S)" Highly specific in nature"):}

Column - I and Column - II contains four emtries each. Entries of Column -I are to be matched with some entries of Column - II . One or more than one entries of Column -I may have the matching with the same entries of Column - II. {:("column-I","column-II"),("(A) Chemisorption","(P) Not specific and decreases with temperature "),("(B) physisorption",(Q) "sepecific and increases with temperature"),("(C) Desorption of a solute on liquid surface","(R) Increases the surface tension of the liquid "),("(D)Adsorption of a solute on a liquid ","(S) Decreases the surface tension of the liquid "):}

Column - I and Column - II contains four entries each. Entries of Column -I are to be matched with some entries of Column - II . One or more than one entries of Column -I may have the matching with the same entries of Column - II. {:("column-I","column-II"),("(A) milk","(P) Aerosol "),("(B) Dust",(Q) " Emulsion"),("(C) Cheese","(R) Gel "),("(D)Froth ","(S) foam "):}

Column - I and Column - II contains four emtries each. Entries of Column -I are to be matched with some entries of Column - II . One or more than one entries of Column -I may have the matching with the same entries of Column - II. {:("column-I","column-II"),("(A) Coagultation ","(P) Due to persence of charge "),("(B) Electrophoresis ",(Q) " Due to scattering of light "),("(C) tyndall effect","(R) Due to netralization of charge "),("(D)Brownian movement","(S) Due to impact of the molecules of the dis-persion medium with colloidal particles "):}