Here you can find multiple-choice questions (MCQs) for Class 9 science Chapter 3 Atoms and Molecules along with answers. These MCQs are specifically designed for students studying in Class 9 and follow the CBSE board curriculum. They align with the latest syllabus provided for Class 9 science. By attempting these MCQs, students can efficiently revise the concepts discussed in the chapter and effectively prepare for their Class 9 Annual examinations.
Complete chapter-wise science class 9 MCQ – Class 9 Science MCQ with Answers
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Atoms and Molecules Class 9 Science MCQ
1. The law of conservation of mass states that:
a) Matter can be created but not destroyed
b) Matter can be destroyed but not created
c) Matter can neither be created nor destroyed
d) Matter can be created and destroyed simultaneously
Answer
2. The law of constant proportions states that:
a) The ratio of the masses of the elements in a compound is always the same
b) The ratio of the masses of the elements in a compound can vary
c) The ratio of the masses of the elements in a compound is always different
d) The ratio of the masses of the elements in a compound is not fixed
Answer
3. An atom is:
a) The smallest particle of an element that retains the properties of that element
b) The smallest particle of a compound that retains the properties of that compound
c) The smallest particle of a mixture that retains the properties of that mixture
d) The smallest particle of matter in general
Answer
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4. Atoms are extremely small, with typical sizes on the order of:
a) Millimeters
b) Centimeters
c) Nanometers
d) Meters
Answer
5. The modern day symbols of atoms of different elements are based on:
a) The English alphabet
b) Random symbols
c) Greek alphabets
d) Latin names of elements
Answer
6. Atomic mass refers to:
a) The mass of an atom in grams
b) The sum of the masses of protons, neutrons, and electrons in an atom
c) The average mass of all the isotopes of an element
d) The mass of an atom in kilograms
Answer
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7. Atoms exist as:
a) Isotopes
b) Ions
c) Molecules
d) Individual entities
Answer
8. A molecule is:
a) The smallest particle of an element that retains the properties of that element
b) The smallest particle of a compound that retains the properties of that compound
c) The smallest particle of a mixture that retains the properties of that mixture
d) A combination of atoms bonded together
Answer
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9. Molecules of elements are composed of:
a) Only one type of atom
b) Two or more different types of atoms
c) Only protons and neutrons
d) Only electrons
Answer
10. Formula unit mass refers to:
a) The mass of an individual molecule
b) The mass of one mole of a substance
c) The mass of one molecule of a substance
d) The mass of one atom of a substance
Answer
| We hope that the provided CBSE Class 9 Science MCQs Chapter 3 Atoms and Molecules will be helpful for students studying in class 9. Don’t forget to check MTGs CBSE textbooks for class 9. If you want answers to NCERT Questions, MTGs NCERT Text Book+Exemplar Problems-Solutions Science Class 9 is the solution. If you have any questions or concerns about the NCERT Class 9 Science MCQs Chapter 3 Atoms and Molecules, please leave a comment below and we will respond as soon as possible. | 
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