Who was the first to discover dwarf wheat?

Two electric bulbs rated $P_1 \text{ watt}, V \text{ volt}$ and $P_2 \text{ watt}, V \text{ volt}$ are connected in parallel and $V \text{ volt}$ is applied to them. The total power consumed will be

What is known as 'Butter of Tin'?

From the top of a hill $h$ metres high,the angles of depression of the top and the bottom of a pillar are $\alpha$ and $\beta$ respectively. The height (in metres) of the pillar is

On increasing the reverse bias to a large value in a $PN-$junction diode,current

The solution of $\frac{dy}{dx} + \frac{1}{3}y = 1$ is