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Subject: Physics, asked on 29/3/18

​ Any molecule in which the centre of the positive charges does not coincide with the centre of negative charges, may be approximated as an electric dipole ? what that mean

Subject: Physics, asked on 27/3/18

Define thermal resistance and write down the dimensional formula of thermal resistance.

Subject: Physics, asked on 23/3/18

Why does evacuation increase evaporation ? Please tell me the reason for this .

Subject: Physics, asked on 21/3/18

Q.):-  How does evacuation of the chamber enhance evaporation?
If water at 0° C, kept in a container with an open top, is placed in a large evacuated chamber:
1.  all the water will vaporize
2.  all the water will freeze
3.  part of the water will vaporize and the rest will freeze
4.  ice, water and water vapour will be formed and reach equilibrium at the triple point.

Solution:-
Evacuation will greatly enhance evaporation leading to heat loses by water.  As water is 0°C, it begins to freeze. After some time, a part of water will vaporise and the remaining will freeze.
⇒ C is correct.

Subject: Physics, asked on 17/3/18

​Please answer 

Q. The below graph represents temperature versus heat for water at 1 atm. pressure.
                    
     (a). Match the following using the above graph.
             
Graph Process State
i) BC a) Melting p) Water
ii)DE b) Sublimation q) Ice
  c) Regelation r) Partially Solid
  d) Vapourisation s) Partially liquid and vapour

    (b) The slopes of AB and CD are different. Why?

Subject: Physics, asked on 16/3/18

Differentiate and explain Weins and Ferrys black Body.

Subject: Physics, asked on 16/3/18

Explain Absolute Emmisivity

Subject: Physics, asked on 16/3/18

Explain monochromatic absorptance in detail

Subject: Physics, asked on 16/3/18

Solve this:

Subject: Physics, asked on 16/3/18

Deduce a General Equation for Junction/interface temp, of 3 heat conducting rods in series.(H1=H2=H3)

Subject: Physics, asked on 10/3/18

what is the thermal conductivity of perfect heat conductors?

Subject: Physics, asked on 5/3/18

Why do animals curl up into a sphere in cold climates ? please explain using equation of thermal conductivity.

Subject: Physics, asked on 3/3/18

The temperature of a black body is increased from 100 K to 200 K .How will the rate of
emission of energy change?
 

Subject: Physics, asked on 19/2/18

Solve this:
Q.15. A uniform disc of radius r is placed over another disc of radius 2r of the same thickness and density in such a way that the edges of the two disc touch each other (as shown) at a point. Find the co-ordinates of centre of mass of this system.

Subject: Physics, asked on 19/2/18

Solve this:
Q.(ii) A block slides down at an angle 30° with an acceleration g4. Find the coefficient of kinetic friction.
 

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