Here you can find multiple-choice questions (MCQs) for Class 9 science Chapter 4 Structure of Atom 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.
Previously – Atoms and Molecules Class 9 MCQ
Check Science Class 9 MCQ – Class 9 Science MCQ Chapterwise with Answers
Atoms and Molecules Class 9 Science MCQ
Q.1. The subatomic particles present in an atom are:
- a) Protons, electrons, and neutrons
- b) Protons, neutrinos, and electrons
- c) Protons, muons, and electrons
- d) Positrons, electrons, and neutrinos
Answer
Q.2. Which of the following particles has a positive charge?
a) Proton
b) Electron
c) Neutron
d) All of the above
Answer
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Q.3. According to Thomson’s model of an atom, the atom consists of:
a) A solid sphere of positive charge
b) A nucleus surrounded by electrons in definite orbits
c) A positively charged nucleus
d) A nucleus containing protons and electrons randomly distributed in the atom
Answer
Q.4. Rutherford’s model of an atom showed that most of the mass of an atom is concentrated in:
a) Electrons
b) Protons
c) Neutrons
d) Nucleus
Answer
Q.5. According to Bohr’s model of an atom, electrons revolve around the nucleus in:
a) Random orbits
b) Definite orbits or shells
c) Multiple energy levels simultaneously
d) Spiral paths
Answer
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Q.6. Neutrons are neutral particles present in the nucleus of an atom.
a) True
b) False
Answer
Q.7. The distribution of electrons in different orbits or shells follows which of the following principles?
a) Aufbau principle
b) Valence principle
c) Pauli exclusion principle
d) Hund’s rule
Answer
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Q.8. Valency of an element is defined as:
a) The number of protons in an atom
b) The number of electrons gained or lost by an atom to attain stability
c) The number of neutrons in an atom
d) The number of energy levels in an atom
Answer
Q.9. What does the atomic number of an element signify?
a) The number of neutrons in an atom
b) The sum of protons and neutrons in an atom
c) The number of protons in an atom
d) The number of electrons in an atom
Answer
Q.10.Isotopes of an element have the same:
a) Atomic mass
b) Atomic number
c) Number of neutrons
d) Number of energy levels
Answer
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