Define coefficient of thermal conductivity. Derive its expression.

Explain Modulus of rigidity. Derive an expression for the same.

Explain the combination of springs in series. Derive expression for the same.

Define critical velocity and derive an expression for the same. OR What is critical velocity? Derive an expression for critical velocity of a satellite orbiting at a certain height. Also discuss the formula when satellite is very close to the earth's surface.

Explain the combination of springs in parallel Derive expression for the same.

Explain Young's Modulus. Derive an expression for the same. OR Whatis young'smodulus?Describe anexperiment to find out young's modulus of material, in the form of a long string wire.

Define angular dispersion for a prism. Obtain its expression for a thin prism.Relate it with the refractive indices of the material of the prism for corresponding colours. OR Derive an expression for angular dispersion and mean deviation.

Explain and define dispersive power of a transparent material. Obtain its expressions in terms of angles of deviation and refractive indices. OR Define Dispersive Power. Derive an expression for the same.

Describe the working of a refrigerator as a heat pump . Derive an expression for its coefficient of performance.

Explain the construction and working of a transformer. Derive an expression for ratio of emfs in terms of number of turns in primary and secondary coil (march 14,16 july 17).