Which one of the following about an electron occupying the $1s$ orbital in a hydrogen atom is incorrect? (Bohr's radius is represented by $a_0$)

Match the items in Column-$A$ with the items in Column-$B$.

Column-$A$	Column-$B$
$(1)$ Dalton	$(A)$ Photoelectric effect
$(2)$ Maxwell	$(B)$ Wave theory
$(3)$ Huygens	$(C)$ Atomic theory
	$(D)$ Electromagnetic radiation

If the wavelength for an electron emitted from $H$ atom is $3.3 \times 10^{-10} \ m$,then energy absorbed by the electron in its ground state compared to minimum energy required for its escape from the atom,is $.......$ times. (Nearest integer).
[Given $: h = 6.626 \times 10^{-34} \ Js$,Mass of electron $= 9.1 \times 10^{-31} \ kg$ ]

Which of the following statement$(s)$ is (are) correct?

In the transition of an electron in an atom,its kinetic energy changes from $y$ to $y/4$. The change in $P.E.$ will be

Among the following,the correct statement$(s)$ for electrons in an atom is(are):
$A$. Uncertainty principle rules out the existence of definite paths for electrons.
$B$. The energy of an electron in $2s$ orbital of an atom is lower than the energy of an electron that is infinitely far away from the nucleus.
$C$. According to Bohr's model,the most negative energy value for an electron is given by $n=1$,which corresponds to the most stable orbit.
$D$. According to Bohr's model,the magnitude of velocity of electrons increases with increase in values of $n$.