Willer Academy: Chemistry Test #4 – Structure of the Atom

Chapter: NCERT Class 9 – Chapter 4 | NEET Foundation

Instructions:
✔ 10 MCQs | +4 for Correct | –1 for Incorrect | 0 for Unattempted
✔ Submit to see your score and in-depth feedback.

1. The nucleus of an atom contains:
a) Electrons and protons b) Protons and neutrons c) Neutrons and electrons d) Only protons

2. The mass of an electron is approximately:
a) Equal to neutron b) 1/1836 of a proton c) Equal to proton d) Double that of a proton

3. Which statement best explains Thomson’s model of atom?
a) Electrons revolve in fixed orbits b) Atom as a sphere of positive charge with electrons embedded c) Electrons and protons in nucleus d) Atom is mostly empty space

4. The maximum number of electrons in the K shell is:
a) 4 b) 8 c) 18 d) 2

5. Isotopes have:
a) Same atomic number, different mass number b) Different atomic number, same mass number c) Same number of neutrons d) Same number of electrons and neutrons

6. The atomic number is:
a) Number of protons b) Number of electrons c) Number of neutrons d) Number of nucleons

7. The number of electrons in O^2– (oxide ion) is:
a) 6 b) 10 c) 8 d) 16

8. Which of these pairs are isobars?
a) 6C¹⁴ and 7N¹⁴ b) 1H¹ and 1H² c) 8O¹⁶ and 8O¹⁸ d) 6C¹² and 14Si²⁸

9. Which subatomic particle carries no charge?
a) Proton b) Neutron c) Electron d) Positron

10. What is the valency of elements with 3 or 5 electrons in valence shell?
a) 8 b) 3 c) 5 d) 2

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