Class 9 Science Chapter 9 Atomic Foundations of Matter – Latest Concept Clarity MCQs with Answers | New NCERT Book 2026–27 Edition

   Welcome to our Class 9 Science Chapter 9 Atomic Foundations of Matter Concept Clarity MCQs with Answers. This practice set contains latest MCQs based on the new NCERT Class 9 Science Book 2026–27 Edition and is designed to help students strengthen their understanding of important concepts related to atoms, molecules, atomic structure, and the fundamental building blocks of matter.

These concept-based MCQs focus on understanding rather than memorisation, helping students test their conceptual clarity and identify areas that need improvement. The questions are ideal for Class 9 students preparing for school examinations, revision, and concept-based assessments according to the latest NCERT textbook and syllabus for the 2026–27 academic session.

Atomic Foundations of Matter Current Concept Clarity MCQs with Answers:-

1. Which type of bond is formed by sharing of electrons?
(a) Ionic bond
(b) Covalent bond
(c) Hydrogen bond
(d) None of these

2. How many electrons need to be shared for the formation of a double covalent bond?
(a) 2 electrons
(b) 6 electrons
(c) 4 electrons
(d) None of these

3. What does the law of conservation of mass state?
(a) Matter can be created but not destroyed in a chemical reaction.
(b) Matter cannot be created but can be destroyed in a chemical reaction.
(c) Matter can be created or destroyed in a chemical reaction.
(d) Matter can neither be created nor destroyed in a chemical reaction.

4. Who proposed the law of conservation of mass and when?
(a) Robert Hooke, 1665
(b) Galileo Galilei, 1798
(c) Antoine Lavoisier, 1798
(d) Antoine Lavoisier, 1789

5. In a neutral atom, number of protons =
(a) Atomic mass
(b) Number of electrons
(c) Number of neutrons
(d) Atomic number

6. If 2 atoms are joined by sharing one electron each, they are said to be joined by a:
(a) Double bond
(b) Covalent bond
(c) Single bond
(d) Ionic bond

7. A hydrogen molecule (H₂) needs ____ molecules to be stable.
(a) 1
(b) 0
(c) 2
(d) 3

8. Protons present in a nucleus tell the:
(a) Atomic mass
(b) Number of neutrons
(c) Atomic number
(d) Number of electrons

9. If there is an atom with atomic number 3, how many more electrons are required in the outermost shell to make it stable?
(a) 7
(b) 1
(c) 0
(d) 8

10. What is the atomic number of chlorine?
(a) 16
(b) 17
(c) 15
(d) 18

11. What is cinnabar known as in India?
(a) Dekh-Bhopka
(b) Hingula
(c) Kantimsha
(d) Hingula

12. Atoms combine in the ratio of ____ numbers to form compounds.
(a) Whole
(b) Natural
(c) Fractional
(d) Decimal

13. The force that holds atoms together is known as a:
(a) Atomic bond
(b) Nuclear bond
(c) Chemical bond
(d) Magnetic bond

14. Atoms can release enormous energy when their nuclei split or combine to form new elements. This is known as:
(i) Atomic energy
(ii) Thermal energy
(iii) Nuclear energy
(iv) Chemical energy

(a) (i) and (iv)
(b) (i), (ii)
(c) (ii), (iii)
(d) (iii), (iv)

15. Covalent compounds are named by indicating the number of ____ of each element of a compound.
(a) Protons
(b) Atoms
(c) Electrons
(d) Molecules

16. What is the formula of magnesium ion?
(a) Mg
(b) Mg⁺
(c) Mg²⁺
(d) Mg²⁻

17. Some ions are formed by the combination of 2 or more atoms of 2 or more elements. This is known as:
(a) Monoatomic ions
(b) Ionic ions
(c) Polyatomic ions
(d) Quantum ions

18. When an electron is added to an atom, it acquires a ____ charge.
(a) Positive
(b) Positive
(c) Neutral
(d) Negative

19. The formula for filling electrons is:
(a) n²
(b) 2n²
(c) 2n
(d) 2n + 1

20. If an atom has 28 electrons in total, how many will be present in the valence shell of the atom?
(a) 2
(b) 8
(c) 18
(d) 1

Answers

1-B | 2-C | 3-D | 4-D | 5-B | 6-C | 7-B | 8-C | 9-A | 10-B | 11-B | 12-A | 13-C | 14-C | 15-B | 16-C | 17-C | 18-D | 19-B | 20-A

put it in a sequence from 1 to 20

Chapter 9 – MCQs

1. Which type of bond is formed by sharing of electrons?
(a) Ionic bond
(b) Covalent bond
(c) Hydrogen bond
(d) None of these

2. How many electrons need to be shared for the formation of a double covalent bond?
(a) 2 electrons
(b) 6 electrons
(c) 4 electrons
(d) None of these

3. What does the law of conservation of mass state?
(a) Matter can be created but not destroyed in a chemical reaction.
(b) Matter cannot be created but can be destroyed in a chemical reaction.
(c) Matter can be created or destroyed in a chemical reaction.
(d) Matter can neither be created nor destroyed in a chemical reaction.

4. Who proposed the law of conservation of mass and when?
(a) Robert Hooke, 1665
(b) Galileo Galilei, 1798
(c) Antoine Lavoisier, 1798
(d) Antoine Lavoisier, 1789

5. In a neutral atom, number of protons =
(a) Atomic mass
(b) Number of electrons
(c) Number of neutrons
(d) Atomic number

6. If 2 atoms are joined by sharing one electron each, they are said to be joined by a:
(a) Double bond
(b) Covalent bond
(c) Single bond
(d) Ionic bond

7. A hydrogen molecule (H₂) needs ____ molecules to be stable.
(a) 1
(b) 0
(c) 2
(d) 3

8. Protons present in a nucleus tell the:
(a) Atomic mass
(b) Number of neutrons
(c) Atomic number
(d) Number of electrons

9. If there is an atom with atomic number 3, how many more electrons are required in the outermost shell to make it stable?
(a) 7
(b) 1
(c) 0
(d) 8

10. What is the atomic number of chlorine?
(a) 16
(b) 17
(c) 15
(d) 18

11. What is cinnabar known as in India?
(a) Dekh-Bhopka
(b) Hingula
(c) Kantimsha
(d) Hingula

12. Atoms combine in the ratio of ____ numbers to form compounds.
(a) Whole
(b) Natural
(c) Fractional
(d) Decimal

13. The force that holds atoms together is known as a:
(a) Atomic bond
(b) Nuclear bond
(c) Chemical bond
(d) Magnetic bond

14. Atoms can release enormous energy when their nuclei split or combine to form new elements. This is known as:
(i) Atomic energy
(ii) Thermal energy
(iii) Nuclear energy
(iv) Chemical energy

(a) (i) and (iv)
(b) (i) and (ii)
(c) (ii) and (iii)
(d) (iii) and (iv)

15. Covalent compounds are named by indicating the number of ____ of each element of a compound.
(a) Protons
(b) Atoms
(c) Electrons
(d) Molecules

16. What is the formula of magnesium ion?
(a) Mg
(b) Mg⁺
(c) Mg²⁺
(d) Mg²⁻

17. Some ions are formed by the combination of 2 or more atoms of 2 or more elements. This is known as:
(a) Monoatomic ions
(b) Ionic ions
(c) Polyatomic ions
(d) Quantum ions

18. When an electron is added to an atom, it acquires a ____ charge.
(a) Positive
(b) Neutral

(c) Negative
(d) None of these

19. The formula for filling electrons is:
(a) n²
(b) 2n²
(c) 2n
(d) 2n + 1

20. If an atom has 18 electrons in total, how many will be present in the valence shell of the atom?
(a) 2
(b) 8
(c) 18
(d) 10



🧠 TopperGuru1 Concept Check

Before checking the answer key, ask yourself these two questions for every MCQ:
✅ Why is the correct option right?
✅ Why are the other three options wrong?
If you can explain both, your concept is truly clear. If not, revise the related NCERT concept and try again.
Remember: Real learning happens when you understand the reason, not when you memorize the answer. 

Answer Key:-
1-B, 2-C, 3-D, 4-D, 5-B, 6-C, 7-B, 8-C, 9-A, 10-B, 11-B, 12-A, 13-C, 14-B, 15-B, 16-C, 17-C, 18-C, 19-B, 20-B

Class 9 Science Chapter 9 Atomic Foundations of Matter MCQs – Keep Practising!

We hope these Class 9 Science Chapter 9 Atomic Foundations of Matter MCQs with Answers helped you test your conceptual understanding of the chapter. These latest concept clarity MCQs are based on the new NCERT Class 9 Science Book 2026–27 Edition and are designed to strengthen your concepts and prepare you for exams.

How many questions did you answer correctly? Check your answers using the answer key above and revise the concepts where you made mistakes.

Keep practising with TopperGuru1 for more Class 9 Science MCQs, concept clarity questions, and chapter-wise practice questions with answers based on the latest NCERT syllabus.

Happy Learning with TopperGuru1! 📚

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