journey inside the atom chapter 8

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MCQ Science Class 9
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Science Class 9

Journey Inside the Atom Chapter 8

CBSE Board

Teacher Name : Rakesh
Total Questions : 20
Time Allowed : 60
Total Marks : 20

Q 1 :Which of the following represents the electronic configuration of sodium (Na)?
- 1s² 2s² 2p⁶ 3p¹
- 1s² 2s² 2p⁶ 3s¹
- 1s² 2s² 2p⁶ 3s² 3p¹
- 1s² 2s² 2p⁶ 3s²
Q 2 :In the case of NH₃, what is the valency of nitrogen?
- 4
- 1
- 3
- 2
Q 3 :What is the main difference between isotopes and isobars?
- Isobars have the same number of protons but different neutrons
- Isotopes have the same number of protons but different neutrons
- Isotopes have different atomic numbers
- Isobars are the same element
Q 4 :What is the electronic configuration of an oxygen atom?
- 1s² 2s² 2p²
- 1s² 2s² 2p⁶
- 1s² 2s² 2p⁴
- 1s² 2s² 2p³
Q 5 :Which of the following is a correct representation of an electron's energy level?
- Electrons occupy fixed orbits
- Electrons are stationary
- Electrons are randomly distributed
- Electrons can exist anywhere
Q 6 :Which of the following statements is true regarding the stability of noble gases?
- They have no electrons
- They have a complete valence shell
- They have high reactivity
- They have only one electron in the outer shell
Q 7 :Which of the following pairs are isotopes?
- Sodium-23 and Sodium-24
- Oxygen-16 and Oxygen-18
- Hydrogen and Deuterium
- Carbon-12 and Carbon-14
Q 8 :What did Rutherford's gold foil experiment demonstrate?
- The existence of a dense nucleus
- Atoms are indivisible
- All mass is concentrated in electrons
- Electrons are embedded in a positive sphere
Q 9 :What is the valency of chlorine (Cl)?
- 2
- 1
- 0
- 7
Q 10 :Which of the following elements is an example of an isotope?
- Sodium-23
- Oxygen-16
- Chlorine-35
- Carbon-12
Q 11 :What is the charge of a proton?
- Neutral
- Positive
- Negative
- Variable
Q 12 :Which of the following is true about neutrons?
- They are the lightest subatomic particle
- They are positively charged
- They have no charge
- They are negatively charged
Q 13 :How many neutrons are present in an atom of Magnesium (Mg) with a mass number of 24 and atomic number of 12?
- 12
- 18
- 24
- 6
Q 14 :Why do electrons not fall into the nucleus?
- They move in random paths
- They have no mass
- They occupy specific energy levels
- They are attracted to protons
Q 15 :What is valency?
- The number of protons in an atom
- The combining capacity of an atom
- The mass of an atom
- The number of neutrons in an atom
Q 16 :What is the atomic number of an element?
- The number of protons in the nucleus
- The total number of neutrons
- The mass of the atom
- The total number of electrons
Q 17 :What is the mass number of an atom with 6 protons and 8 neutrons?
- 6
- 8
- 14
- 12
Q 18 :What is the main postulate of Dalton's atomic theory?
- Atoms can be created and destroyed
- Atoms can change into other elements
- All atoms of an element are identical
- Atoms are indivisible particles
Q 19 :How do you calculate the mass number of an atom?
- Protons - Neutrons
- Electrons + Protons
- Protons + Neutrons
- Electrons - Neutrons
Q 20 :Which model proposed that electrons move in fixed orbits around the nucleus?
- Bohr's atomic model
- Dalton's model
- Rutherford's model
- Thomson's model

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