class 9 science chapter 6 mcq
30 " The theory of gravitation " was discovered by
1. einstein
2. newton
3. Aristotle
4. galileo
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29 " History of science " was written by
1. Robert hook
2. f. cojori
3. newton
4. Copernicus
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28 Heliocentric theory was proposed by
1. Albert einstein
2. Robert clins
3. Copernicus
4. f.cojori
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27 The following one is used to measure liquids in laboratory
1. measuring cylinder
2. spring balance
3. buret
4. both 1 and 3
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