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).

In these question, a statement of asertion followed by a statement of reason is given .Choose the correct answer out of the following choices: Assertion and reason both are correct statements and reason is correct explanation for assertion. Assertion and reason both are correct statements but reason is not correct explanation for assertion. Assertion is correct statement but reason is wrong statement. Assertion is wrong statement but reason is correct statement. Assertion:When a tiny circular obstacle is placed in th path of light from some distance,a bright spot is seen at the cente of the shadow of the ostacle. Reason:Destructive interference occurs at the centre of the shadow.

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 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 "):}