class 9 science chapter 5 mcq
21 The average rainfall of a desert is less than
1. 20 cm
2. 24 cm
3. 23 cm
4. 28 cm
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20 " Science is a history of corrected mistakes ". This was said by
1. Albert einstein
2. darwin
3. Edison
4. Karl Popper
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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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