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Structure of the Atom - Class 9 Science Quiz

A Quiz for CBSE Class 9 Science Students (Set 4)

Welcome to the Structure of the Atom Quiz! This quiz is designed for CBSE Class 9 Science students and focuses solely on the content from Chapter 4 of your science textbook. Test your understanding of fundamental concepts related to sub-atomic particles, atomic models, electron distribution, valency, atomic number, mass number, isotopes, and isobars. This is Set 4 of 5, containing 10 multiple-choice questions. Good luck!

1. According to Bohr's model, what is the term for the fixed paths or orbits in which electrons revolve around the nucleus?

A) Nucleons B) Shells or energy levels C) Valency D) Isotopes

2. What is the charge of an electron?

A) +1 B) 0 C) -1 D) Variable

3. What is the charge of a proton?

A) -1 B) 0 C) +1 D) Variable

4. What is the charge of a neutron?

A) +1 B) -1 C) 0 D) Positive or negative

5. An atom of an element has 5 electrons in its M-shell. What is its electronic configuration?

A) 2, 8, 5 B) 2, 5, 8 C) 5, 8, 2 D) 8, 2, 5

6. When an atom gains electrons, what type of ion is formed?

A) Cation B) Anion C) Isotope D) Isobar

7. When an atom loses electrons, what type of ion is formed?

A) Anion B) Cation C) Neutral atom D) Molecule

8. What is the atomic mass unit (amu) or 'u' approximately equal to?

A) The mass of an electron B) The mass of a proton or neutron C) The mass of a hydrogen atom D) The mass of an alpha particle

9. Why do isotopes of an element show similar chemical properties?

A) They have the same mass number. B) They have different numbers of neutrons. C) They have the same number of valence electrons. D) They have different atomic numbers.

10. Which isotope of Uranium is used as a fuel in nuclear reactors?

A) U-235 B) U-238 C) U-232 D) U-234

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Structure of the Atom - Class 9 Science Quiz

A Quiz for CBSE Class 9 Science Students (Set 4)

1. According to Bohr's model, what is the term for the fixed paths or orbits in which electrons revolve around the nucleus? Read

2. What is the charge of an electron? Read

3. What is the charge of a proton? Read

4. What is the charge of a neutron? Read

5. An atom of an element has 5 electrons in its M-shell. What is its electronic configuration? Read

6. When an atom gains electrons, what type of ion is formed? Read

7. When an atom loses electrons, what type of ion is formed? Read

8. What is the atomic mass unit (amu) or 'u' approximately equal to? Read

9. Why do isotopes of an element show similar chemical properties? Read

10. Which isotope of Uranium is used as a fuel in nuclear reactors? Read