1) Radiation
2) Yes... I think
3) Rain gauge
4) Distance
5) N,P,K
6) Chemical reaction
7) non conductor
9) pitch
10) transparent
11) 6 feet
12) Ultrasonic
13) Fusion nuclear reaction
14) Distance( Length)
15) Zi + Ni
16) South pole
17) 37 C (Depends on time....)
18) Milk
19) None of these( Flow of water)
20) Mariana trench

Rectifications are cardially invited....