Which of the following is an example of a new crop?

In a circuit,the current lags behind the voltage by a phase difference of $\pi / 2$. The circuit contains which of the following?

If $A, B$ and $C$ are mutually exclusive and exhaustive events of a random experiment such that $P(B) = \frac{3}{2} P(A)$ and $P(C) = \frac{1}{2} P(B)$,then $P(A \cup C)$ equals to

The ratio of the ionization energy of a Bohr hydrogen atom to that of a Bohr hydrogen-like lithium atom is:

$EMF$ of the following concentration cell will be $............$ $V$
$Cl_2(1 \ atm) | Cl^{-}(1 \ M) || Cl^{-}(0.1 \ M) | Cl_2(2 \ atm)$

The volume in $mL$ of $0.1 M$ solution of $NaOH$ required to completely neutralize $100 \ mL$ of $0.3 M$ solution of $H_3PO_3$ is: