Question

00 hrs
Half Yearly Examination 2020-2021
Subject : Science
M.
Class : IX EM
Multiple choice question :-
1. Ratio of hydrogen and oxygen in water is : 1 1:8, 2:12, 2:3, 1:21
2. Who produced the atom model first: M.J.Thomson, chodwick, Goldstein, Boh
3. The chemical symbol for nitrogen gas is : | Ni, N2, N, X
4. The pumber of volency electron in oxygen atom is : [ 8.2, 7, 6, 1
6. Neutron was discovered by : I Chadwick, Thomson, Ruther ford, None​

Answer 1

Answer:

1. 1:8
2. Chadwick
3. N
4. 6

........

Answer 2

Answer:

1-2:3

2-Goldstein

3-N2

4-6

6-

Explanation:

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