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Subject :NSO    Class : Class 9

There are three isotopes of carbon which are named as C-12, C-13 and C-14 out of which C-12 is the most abundant isotope. In the given structures of three isotopes, what will be the composition of the nucleus?


A C - 12 : 6p + 6n, C - 13 : 7p + 6n, C - 14 : 8p + 6n
B C - 12 : 6p + 6n, C -13 : 6p + 7n, C - 14 : 6p + 8n
C C - 12 : 6p + 6n, C - 13 : 5p + 8n, C - 14 : 7p + 7n
D C - 12 : 6p + 6n, C - 13 : 12p +1n, C - 14 : 5p + 9n


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Subject :NSO    Class : Class 8

Consider the following statements and select the option which correctly identifies true (T) and false (F) ones.
(i) Diatoms are marine algae which float in water due to the presence of light storage fats with silica.
(ii) AIDS virus kills WBC and reduces immunity of the body.
(iii) Escherichia coli is present in intestine of human where they help in digestion of food.
(iv) A virus always consists of double strands of DNA or RNA surrounded by protein coat.

(i) (ii) (iii) (iv)
A T F T F
B T T T F
C T T F F
D T F T T


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