Write any two questions about the formation of mirage.
14. What an the applications of optical fibers ?
15. What precautions must be taken while conducting the experiment for
angle of vision of eye.
16. How do you what is the use of slip rings in AC motor ?
17. Name the carboxylic acid used as preservative ?
18. Mention two methods which produce very pure metals?
19. Which bond is present in CaO molecule ?
20. How many elements are present in IA group?
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17 acetic acid 20 6 elements lithium li, sodium na, potassium K, rubidium rb, cesium Cs, and francium Fr
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