Which frequency of microwave is used by a microwave oven to cook food (in $GHz$)?

Match List-$I$ with List-$II$:

List-$I$	List-$II$
$(a)$ Ultraviolet rays	$(i)$ Study crystal structure
$(b)$ Microwaves	$(ii)$ Greenhouse effect
$(c)$ Infrared waves	$(iii)$ Sterilizing surgical instruments
$(d)$ $X$-rays	$(iv)$ Radar system

Choose the correct answer from the options given below:

If microwaves,$X$ rays,infrared,gamma rays,ultraviolet,radio waves and visible parts of the electromagnetic spectrum are denoted by $M, X, I, G, U, R$ and $V$ respectively,then which of the following is the arrangement in ascending order of wavelength?

Practically,the ozone layer absorbs radiations of wavelength:

Fingerprints on a piece of paper may be detected by sprinkling fluorescent powder on the paper and then looking at it under:

Which of the following is an electromagnetic wave?