ch 6 science class 9 mcq
19 The persons observing the rates of chemical reaction is
1. ecologist
2. chemist
3. geologist
4. biologist
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18 The secret of inventions lies in identifying the
1. change
2. theory
3. problem
4. analysis
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17 The place where a scientist works in a
1. library
2. laboratory
3. classroom
4. forest
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16 The ' National bird of India '
1. sparrow
2. parrot
3. peacock
4. eagle
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