Quiz on Structure of the Atom (Class 9 Science Quiz) (Set 1)

1. Which three sub-atomic particles constitute an atom?

A) Electrons, Ions, and Neutrons B) Protons, Molecules, and Electrons C) Electrons, Protons, and Neutrons D) Atoms, Protons, and Electrons

2. According to J.J. Thomson's model, how are electrons arranged within a positively charged sphere?

A) They orbit the central nucleus. B) Embedded like seeds in a watermelon. C) They are located outside the atom. D) They are freely moving in space.

3. What was the most unexpected observation from Rutherford's alpha-particle scattering experiment?

A) Most alpha-particles passed straight through the foil. B) Some alpha-particles were slightly deflected. C) One out of every 12000 particles rebounded. D) Alpha-particles were negatively charged.

4. What was a major drawback of Rutherford's model of the atom regarding its stability?

A) It could not explain the fixed paths of electrons. B) It proposed that electrons would lose energy and fall into the nucleus, making the atom unstable. C) It failed to explain the existence of protons. D) It did not account for the mass of the atom.

5. What is one of Neils Bohr's postulates about electrons revolving in discrete orbits?

A) Electrons continuously radiate energy. B) Electrons are only found in the nucleus. C) Electrons do not radiate energy while revolving in discrete orbits. D) Electrons jump between orbits randomly.

6. Which sub-atomic particle was discovered by J. Chadwick in 1932?

A) Proton B) Electron C) Neutron D) Positron

7. According to Bohr and Bury, what is the maximum number of electrons that can be accommodated in the outermost shell of an atom?

A) 2 B) 8 C) 18 D) 32

8. What is the definition of valency of an atom?

A) Its atomic number. B) Its atomic mass. C) Its combining power or capacity. D) The number of neutrons in its nucleus.

9. How is the atomic number (Z) of an element determined?

A) By the sum of protons and neutrons. B) By the number of electrons only. C) By the number of protons present in the nucleus. D) By the total mass of the atom.

10. Which statement accurately defines isotopes?

A) Atoms of different elements with the same mass number. B) Atoms of the same element with the same atomic number but different mass numbers. C) Atoms of the same element with different chemical properties. D) Atoms with different atomic numbers and different mass numbers.

Structure of the Atom - Class 9 Science Quiz

A Quiz for CBSE Class 9 Science Students (Set 1)

1. Which three sub-atomic particles constitute an atom?

2. According to J.J. Thomson's model, how are electrons arranged within a positively charged sphere?

3. What was the most unexpected observation from Rutherford's alpha-particle scattering experiment?

4. What was a major drawback of Rutherford's model of the atom regarding its stability?

5. What is one of Neils Bohr's postulates about electrons revolving in discrete orbits?

6. Which sub-atomic particle was discovered by J. Chadwick in 1932?

7. According to Bohr and Bury, what is the maximum number of electrons that can be accommodated in the outermost shell of an atom?

8. What is the definition of valency of an atom?

9. How is the atomic number (Z) of an element determined?

10. Which statement accurately defines isotopes?

Quiz Results

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Structure of the Atom - Class 9 Science Quiz

A Quiz for CBSE Class 9 Science Students (Set 1)

1. Which three sub-atomic particles constitute an atom? Read

2. According to J.J. Thomson's model, how are electrons arranged within a positively charged sphere? Read

3. What was the most unexpected observation from Rutherford's alpha-particle scattering experiment? Read

4. What was a major drawback of Rutherford's model of the atom regarding its stability? Read

5. What is one of Neils Bohr's postulates about electrons revolving in discrete orbits? Read

6. Which sub-atomic particle was discovered by J. Chadwick in 1932? Read

7. According to Bohr and Bury, what is the maximum number of electrons that can be accommodated in the outermost shell of an atom? Read

8. What is the definition of valency of an atom? Read

9. How is the atomic number (Z) of an element determined? Read

10. Which statement accurately defines isotopes? Read

Quiz Results

Was this page helpful?

1. Which three sub-atomic particles constitute an atom?

2. According to J.J. Thomson's model, how are electrons arranged within a positively charged sphere?

3. What was the most unexpected observation from Rutherford's alpha-particle scattering experiment?

4. What was a major drawback of Rutherford's model of the atom regarding its stability?

5. What is one of Neils Bohr's postulates about electrons revolving in discrete orbits?

6. Which sub-atomic particle was discovered by J. Chadwick in 1932?

7. According to Bohr and Bury, what is the maximum number of electrons that can be accommodated in the outermost shell of an atom?

8. What is the definition of valency of an atom?

9. How is the atomic number (Z) of an element determined?

10. Which statement accurately defines isotopes?