11. The largest application of microwave is :
(a) Industrial heating
(b) Research
(c) Cooking
(d) Communication
12. The wavelength for microwave frequencies are :
(a) More than 1 m
(b) Less than 1 mm
(c) From 1 mm to 1 m
(d) 0.3 to 300 m
13. Indication the noise whose source is in a category different from that of the other three ?
(a) Solar noise
(b) Cosmic noise
(c) Atmospheric noise
(d) Galactic noise
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