Name the plant whose leaves are economically important and earn foreign exchange.

In the following combinations of logic gates,the outputs of $A, B$ and $C$ are respectively:

The area (in sq units) of the region bounded by $x=-1, x=2, y=x^2+1$ and $y=2x-2$ is

If the lines $2x + 3y + 12 = 0$ and $x - y + k = 0$ are conjugate with respect to the parabola $y^2 = 8x$,then $k$ is equal to

The pair of xenon compounds which have the same number of lone pairs of electrons on the central atom is

$A$ $10 \ kW$ transmitter emits radio waves of wavelength $500 \ m$. The number of photons emitted per second by the transmitter is of the order of: