class 9 question paper science
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Section A
1. How many valence electrons are there in sodium? Write electrons distribution
2.what is pressure ? What is its S.I. units?
3.Name two diseases spread by mosquito
4.An electric bulb of 60W is used for 6 hour per day calculate the units of energy consumed in one day by the bulb
1. How many valence electrons are there in sodium? Write electrons distribution
2.what is pressure ? What is its S.I. units?
3.Name two diseases spread by mosquito
4.An electric bulb of 60W is used for 6 hour per day calculate the units of energy consumed in one day by the bulb
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