Which rays are not a portion of the electromagnetic spectrum?

Match List-$I$ with List-$II$.

List-$I$ (Electromagnetic waves)	List-$II$ (Use)
$(a)$ $UV$ rays	$(i)$ Diagnostic tool in medicine
$(b)$ $X-$rays	$(ii)$ Water purification
$(c)$ Microwave	$(iii)$ Communication,Radar
$(d)$ Infrared wave	$(iv)$ Improving visibility in foggy days

Choose the correct answer from the options given below:

Write the source of ultraviolet waves.

The frequencies of $\gamma$-rays,$X$-rays,and ultraviolet radiations are $B, A,$ and $C$ respectively. Which of the following relations is correct?

Photons of an electromagnetic radiation have an energy of $11 \, keV$ each. To which region of the electromagnetic spectrum does it belong?

Electromagnetic waves of wavelength ranging from $100 \text{ Å}$ to $400 \text{ Å}$ come under which region?