11. Lightning heats the surrounding air to
12. Which of the following is not an intrusive igneous body?
13. The instrument for measuring intensity of earthquakes is called
14. An instrument that records earthquakes is
15. To prevent damage from lightning, lightning conductors are used on tall structures. The lightning conductor
16. The number of waves per second in a sound is called ________ of that sound.
17. Sound waves do not show the phenomenon of
18. Speed of sound is maximum in which among the following?
19. The ringing of an electric bell in an enclosed evacuated glass bell jar is not heard outside because
20. What is the full form of "RADAR" ?
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