Which oxide of nitrogen is obtained when ammonium nitrate is heated at $250\,^oC$?

Identify the plant and structure marked $A$ and $B:-$

The shadow of a tower standing on a level ground is found to be $60 \ m$ longer when the Sun's altitude is $30^{\circ}$ than when it is $45^{\circ}$. The height of the tower is

$A$ liquid drop of diameter $D$ breaks into $27$ tiny drops. The change in energy is

Among the nitrates of alkali metals,which one can be decomposed to its oxide on strong heating?

The area (in sq units) of the triangle formed by the tangent at $(\sqrt{3}, 0)$ to the hyperbola $x^2-3y^2=3$ with the pair of asymptotes of the hyperbola is