Sample paper of science,social science and mathematics class 9 sa2 ( cbse)
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here r 17 ques and this paper consists of 20 ques. and rest of the ques r here :-
1 8.) An electric bell suspended by thin wires in a glass vessel and set ringing. Describe and explain what happens if the air is gradually pumped out of the vessel ?
.19) how many atoms r present in one g of silicon (si)
20.) write the electronic configuration of aluminum (Al) and find its velency.
( atomic mass of Al = 13 )
Hope it helps.
1 8.) An electric bell suspended by thin wires in a glass vessel and set ringing. Describe and explain what happens if the air is gradually pumped out of the vessel ?
.19) how many atoms r present in one g of silicon (si)
20.) write the electronic configuration of aluminum (Al) and find its velency.
( atomic mass of Al = 13 )
Hope it helps.
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