Which of the following organs is known as the 'blood bank' of the human body?

Acetaldehyde cannot give:

The oxide of nitrogen formed by thermal decomposition of $NH_4NO_3$ is

$A$ whistle $S$ of frequency $f$ revolves in a circle of radius $R$ at a constant speed $v$. What is the ratio of the largest and smallest frequency detected by a detector $D$ at rest at a distance $2R$ from the center of the circle as shown in the figure? (Take $c$ as the speed of sound.)

The relaxation time in conductors

The function $f(x) = \frac{x}{2} + \frac{2}{x}$ has a local minimum at $x = $ ..........