Electromagnetic Spectrum

The decreasing order of wavelength of infrared, microwave, ultraviolet and gamma rays is:

1.	gamma rays, ultraviolet, infrared, microwaves.
2.	microwaves, gamma rays, infrared, ultraviolet.
3.	infrared, microwave, ultraviolet, gamma rays.
4.	microwave, infrared, ultraviolet, gamma rays.

The condition under which a microwave oven heats up a food item containing water molecules most efficiently is:

1.	the frequency of microwaves has no relation with the natural frequency of water molecules.
2.	microwaves are heatwaves, so always produce heating.
3.	infrared waves produce heating in a microwave oven.
4.	the frequency of the microwaves must match the resonant frequency of the water molecules.

The energy of the EM waves is of the order of . To which part of the spectrum does it belong?
1. X-rays
2. Infrared rays
3. Ultraviolet rays
4. -rays

Which colour of the light has the longest wavelength?
1. violet
2. red
3. blue
4. green

The EM wave with the shortest wavelength among the following is:
1. Ultraviolet rays
2. -rays
3. Gamma-rays
4. Microwaves

Match List I with List II.

List - I (Electromagnetic waves)		List - II (Wavelength)
(a)	AM radio waves	(i)
(b)	Microwaves	(ii)
(c)	Infrared radiation	(iii)
(d)	-rays	(iv)

Choose the correct answer from the options given below:

	(a)	(b)	(c)	(d)
1.	(ii)	(iii)	(iv)	(i)
2.	(iv)	(iii)	(ii)	(i)
3.	(iii)	(ii)	(i)	(iv)
4.	(iii)	(iv)	(ii)	(i)