$A$ bryophyte,which harbours a nitrogen-fixing blue-green alga in its thallus,is

An $X$-ray tube is operated at $50 \ kV$. The minimum wavelength produced is ..... $\mathring{A}$.

If there are $n$ capacitors, each of capacitance $C$, connected in parallel to a $V \, \text{volt}$ source, then the energy stored is equal to:

The magnetic flux through a circuit of resistance $R$ changes by an amount $\Delta \phi$ in time $\Delta t$. Then the total quantity of electric charge $Q$ passing during this time through any point of the circuit is given by:

Which of the following statements is incorrect for alkali metals?

The number of $5$-digit numbers that are not divisible by $5$ and consist of different odd digits is: