Quiz on Structure of the Atom (Class 9 Science Quiz) (Set 2)

1. What did E. Goldstein discover in 1886 in a gas discharge experiment?

A) Electrons B) Protons (Canal rays) C) Neutrons D) Alpha particles

2. According to Thomson's model, where are the electrons located within the positively charged sphere of an atom?

A) Orbiting a central nucleus B) Freely moving in space C) Embedded like seeds in a watermelon D) On the surface of the sphere

3. What was the primary reason Rutherford selected a gold foil for his alpha-particle scattering experiment?

A) Gold is a good conductor of electricity. B) Gold is very reactive. C) He wanted as thin a layer as possible. D) Gold atoms are very light.

4. What observation from Rutherford's experiment indicated that most of the space inside the atom is empty?

A) Some alpha-particles were slightly deflected. B) A very small fraction of alpha-particles rebounded. C) Most fast-moving alpha-particles passed straight through the gold foil. D) Alpha-particles were negatively charged.

5. What is a major drawback of Rutherford's model regarding the stability of the atom?

A) It could not explain the fixed energy levels. B) It failed to explain the existence of neutrons. C) It proposed that revolving electrons would lose energy and fall into the nucleus. D) It did not account for the mass of the atom.

6. According to Neils Bohr's postulates, what happens to electrons while revolving in discrete orbits?

A) They continuously radiate energy. B) They lose energy and fall into the nucleus. C) They do not radiate energy. D) They jump randomly between orbits.

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

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

8. What is the maximum number of electrons that can be accommodated in the M-shell (n=3) of an atom, according to Bohr and Bury's scheme?

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

9. What are electrons present in the outermost shell of an atom known as?

A) Core electrons B) Valence electrons C) Inner electrons D) Noble electrons

10. If an atom has 7 electrons in its outermost shell (like fluorine), what is its valency likely to be, considering it's easier to gain electrons than lose them?

A) 7 B) 8 C) 1 D) 0

Structure of the Atom - Class 9 Science Quiz

A Quiz for CBSE Class 9 Science Students (Set 2)

1. What did E. Goldstein discover in 1886 in a gas discharge experiment?

2. According to Thomson's model, where are the electrons located within the positively charged sphere of an atom?

3. What was the primary reason Rutherford selected a gold foil for his alpha-particle scattering experiment?

4. What observation from Rutherford's experiment indicated that most of the space inside the atom is empty?

5. What is a major drawback of Rutherford's model regarding the stability of the atom?

6. According to Neils Bohr's postulates, what happens to electrons while revolving in discrete orbits?

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

8. What is the maximum number of electrons that can be accommodated in the M-shell (n=3) of an atom, according to Bohr and Bury's scheme?

9. What are electrons present in the outermost shell of an atom known as?

10. If an atom has 7 electrons in its outermost shell (like fluorine), what is its valency likely to be, considering it's easier to gain electrons than lose them?

Quiz Results

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Structure of the Atom - Class 9 Science Quiz

A Quiz for CBSE Class 9 Science Students (Set 2)

1. What did E. Goldstein discover in 1886 in a gas discharge experiment? Read

2. According to Thomson's model, where are the electrons located within the positively charged sphere of an atom? Read

3. What was the primary reason Rutherford selected a gold foil for his alpha-particle scattering experiment? Read

4. What observation from Rutherford's experiment indicated that most of the space inside the atom is empty? Read

5. What is a major drawback of Rutherford's model regarding the stability of the atom? Read

6. According to Neils Bohr's postulates, what happens to electrons while revolving in discrete orbits? Read

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

8. What is the maximum number of electrons that can be accommodated in the M-shell (n=3) of an atom, according to Bohr and Bury's scheme? Read

9. What are electrons present in the outermost shell of an atom known as? Read

10. If an atom has 7 electrons in its outermost shell (like fluorine), what is its valency likely to be, considering it's easier to gain electrons than lose them? Read

Quiz Results

Was this page helpful?

1. What did E. Goldstein discover in 1886 in a gas discharge experiment?

2. According to Thomson's model, where are the electrons located within the positively charged sphere of an atom?

3. What was the primary reason Rutherford selected a gold foil for his alpha-particle scattering experiment?

4. What observation from Rutherford's experiment indicated that most of the space inside the atom is empty?

5. What is a major drawback of Rutherford's model regarding the stability of the atom?

6. According to Neils Bohr's postulates, what happens to electrons while revolving in discrete orbits?

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

8. What is the maximum number of electrons that can be accommodated in the M-shell (n=3) of an atom, according to Bohr and Bury's scheme?

9. What are electrons present in the outermost shell of an atom known as?

10. If an atom has 7 electrons in its outermost shell (like fluorine), what is its valency likely to be, considering it's easier to gain electrons than lose them?