CBSE Class 9 Science Atomic Foundations of Matter (Class 9 NCERT New) Quiz 5

1. How the sub atomic particles like Proton is different from electron?

A (a)An electron is much heavier than a proton. B (b)An electron carries more charge than a proton. C (c) A proton can be easily removed from the atom, but not an electron. D (d) A proton is positively charged, whereas an electron is negatively charged

2. Which of the following is NOT the correct explanation of Thompson’s atomic model?

A (a)The atom is positively charged sphere. B (b)Electrons are embedded in the positive sphere. C (c)The positive and negative charges balance each other. D (d)Protons and neutrons are embedded in the center of the sphere.

3. Rutherford conducted an experiment to study the structure of atom. He passedpositively charged alpha particles through a thin gold foil. He studied the angle of deflectionof the alpha particles. He noticed that most of the alpha particles passed through the goldfoil without any deflection. What can be concluded from the observation?

A (a) Most of the space in an atom is empty. B (b) Atoms have electrons, protons, and neutrons. C (c) The nucleus of the atom is situated at the center. D (d) Atoms do not have positively charged particles.

4. Which of the following CAN NOT be the maximum number of electrons in a given shellaccording to the Bohr & Bury’s rule for electronic configuration:

A (a) 2 B (b) 6 C (c) 18 D (d) 32

5. The atomic number of sodium (Na) is 11. How many valence electrons does sodiumhave?

A (a) 1 B b) 2 C (c) 7 D (d) 8

6. The atomic number of Sulphur (S) is 16. Identify the number of electrons in each shell ofSulphur.

A (a)2, 8, 6 B (b)2, 8, 8 C (c)2, 2, 8, 4 D (d)2, 4, 8, 2

7. Which elements have a valency of 2?

A (a) Be and Si B (b) Si and Cl C (c) Be and O D (d) Cl and O

8. Which element would be inert in nature?

A (a) Element with 2 electrons B (b) Element with 9 electrons C (c) Element with 12 electrons D (d) Element with 20 electrons

9. The image shows the scientific notation of sodium. What is the atomic mass of Na?

A (a)11 B (b)12 C (c)23 D (d)34

10. The subatomic particle that determines the identity of an element.

A neutron B proton C electron D outer shell