Assertion (A) The upper surface of the wing of an aeroplane is made convex and the lower surface is made concave.

Reason (R) The air currents at the top have smaller velocity and thus less pressure at the bottom than at the top.

A glass vessel of volume $$V_o$$ is completely filled with a liquid and its temperature is raised by $$\Delta T$$. What volume of the liquid will flow over, if the coefficient of linear expansion of glass is $$\alpha_g$$ and coefficient of volume expansion of the liquid is $$\gamma_l$$ ?

A Carnot engine whose heat sink is at 27$$^\circ$$C has an efficiency of 40%. By how much should its source temperature be changed, so as to increase its efficiency to 60%?

A diatomic gas is heated at constant pressure, what fraction of the heat energy is used to increase the internal energy?