Anology : Copper :conductor:wood::-----

Assertion (A): Food can be cooked faster in copper bottom vessels Reason (R): Copper is the best conductor of heat.

(i) At what temperature would the resistance of copper conductor be double its resistance at 0^(@)C . (ii) Does this temperature hold for all copper conductors regardless of shape and size? Given alpha for Cu=3.9xx10^(-3)""^(@)C^(-1) .

What is the drift velocity of an electron in a copper conductor having area 10 xx 10^(-6) m^2 , carrying a current of 2A. Assume that there are 10 xx 10^(28) electrons/ m^3 .

Anology: Nervous system: Neurons::____Nephrons.

{:("(i) Insulator","(a) Glass"),("(ii) Semiconductor","(b) Germanium"),("(iii) Conductor","(c ) Copper"),("(iv) Super conductor","(d) Mercury"):}

Show variation of resistivity of (i) conductor (i.e. copper) (ii) semiconductor (sI) with temperature is a graph. Give reason.

Identify the conductors and insulators among the following? Copper, plastic,glass,irton,wood,Aluminum,Cina clay, impure water, Earth,ebonite

Anology: Cooking: man-made change:: Rain: _________.

Anology: Irreversible change :Rusting of iron::Reversible change:____