CBSE Class 9 Science Structure of the Atom Quiz 2

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CBSE › Class 9 › Science › Structure of the Atom

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1. The ion of an element has 3 positive charges. Mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion?

A 13 B 10 C 14 D 16

2. An alpha particle is also known as:

A subatomic particle B an unionised helium atom C a neutral particle D a doubly-charged helium ion

3. 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 3 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

4. The charge on an electron is equal to:

A 1. 6 × 10C of -ve charge B 2. 6 × 10C of -ve charge C 1. 6 × 10C of -ve charge D 1. 6 × 10C of -ve charge

5. Which of the following isotope is used in the treatment of blood cancer?

A P-32 B I-131 C Co-60 D any of these

6. Isobars do not differ in the number of

A protons B electrons C neutrons D nucleons

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