NCERT Class 9 Science Chapter 4 Structure of the Atom MCQ

NCERT MCQ Solutions for Class 9 Science Chapter 4 Structure of the Atom provides a well organised set of multiple-choice questions to strengthen conceptual understanding. Covering topics like atomic models, subatomic particles, valency and isotopes, these MCQs help students assess their knowledge effectively. Practicing these questions enhances problem-solving skills and prepares students for exams. With detailed explanations, these solutions ensure clarity in fundamental principles, making learning interactive and efficient for Class 9 Science students.
Class 9 Science Chapter 4 NCERT Solutions
Class 9 Multiple Choice Questions
Class 9 Science MCQ

Exploring Structure of the Atom Through 9th Science MCQs

The Structure of the Atom Class 9 MCQs is an important part of science education, helping students grasp the atomic model’s fundamental principles. Class 9 Science Chapter 4 MCQ covers key concepts such as atomic structure, electron distribution and the discovery of protons and neutrons. These Structure of the Atom Class 9 Test Questions allow students to evaluate their understanding through objective-type queries. The Class 9 Science Chapter 4 Practice Questions include multiple-choice questions that challenge students to recall important scientific facts. By solving these Structure of the Atom Class 9 Sample Questions, students can reinforce their knowledge and build confidence for competitive exams and board assessments.

Q1. The number of neutrons in sodium and magnesium is

[A]. 12 and 11 respectively

[B]. 11 and 11 respectively

[C]. 11 and 12 respectively

[D]. 12 and 12 respectively

Q2. Rutherford’s alpha (a-) particle scattering experiment resulted into the discovery of

[A]. Electron

[B]. Nucleus in the atom

[C]. Atomic mass

[D]. Proton

Q3. In a sample of ethyl ethanoate (CH₃COOC₂H₅) the two oxygen atoms have the same number of electrons but different number of neutrons. Which of the following is the correct reason for it?

[A]. One of the oxygen atoms has gained electrons

[B]. The two oxygen atoms are isotopes

[C]. The two oxygen atoms are isobars

[D]. One of the oxygen atoms has gained two neutrons

Examining the Role of Electrons and Protons in Atomic Structure

The Structure of the Atom Class 9 Assessment focuses on the role of subatomic particles in defining atomic behavior. Class 9 Science Chapter 4 Exam Questions help students differentiate between electrons, protons and neutrons and understand their respective properties. The Structure of the Atom NCERT Solutions Class 9 Question Bank contains diverse questions about Bohr’s model, valency and electronic configuration, which are required for higher studies. Practicing Class 9 Science Chapter 4 Question Paper exercises allows students to solidify their understanding of atomic number and mass number. These Structure of the Atom Class 9 Worksheet problems encourage deep thinking and application-based learning in scientific studies.

Q4. Isotopes of an element have

[A]. Same physical property

[B]. Different atomic number

[C]. Different chemical property

[D]. Different neutrons

Q5. Choose the incorrect statement

[A]. An isotope of iodine is used in the treatment of goitre.

[B]. An isotope of uranium is used as a fuel in nuclear reactor.

[C]. An isotope of cobalt is used in the treatment of cancer.

[D]. An isotope of magnesium is used in the formation of chlorophyll.

Q6. The electron distribution in an aluminium atom is

[A]. 2, 8, 3

[B]. 2, 8, 2

[C]. 8, 2, 3

[D]. 2, 3, 8

Class 9 Science Chapter 4 MCQ on Bohr’s Atomic Models

NCERT Textbook Class 9 Science Chapter 4 Multiple Choice Questions extensively cover the historical models of the atom, including the contributions of scientists such as Rutherford and Bohr. The Structure of the Atom Class 9 Objective Type Questions test students on key findings like the gold foil experiment and energy levels of electrons. Solving Class 9 Science Chapter 4 MCQ with Answers ensures a deep comprehension of atomic theories and their implications in chemistry. The Structure of the Atom Class 9 Practice Test is particularly beneficial for students preparing for exams as it enhances retention and problem-solving skills. Class 9 Science Chapter 4 MCQ PDF format also provides an accessible and convenient way to revise fundamental concepts.

Q7. Elements with valency 1 are

[A]. Always metals

[B]. Always non-metals

[C]. Always metalloids

[D]. Either metals or non-metals

Q8. Which of the following statements is always correct?

[A]. An atom has equal number of electrons and protons

[B]. An atom has equal number of electrons and neutrons

[C]. An atom has equal number of protons and neutrons

[D]. An atom has equal number of electrons, protons and neutrons

Q9. Dalton’s atomic theory successfully explained. (i) Law of conservation of mass (ii) Law of constant composition (iii) Law of radioactivity (iv) Law of multiple proportion.

[A]. (i), (ii) and (iii)

[B]. (ii), (iii) and (iv)

[C]. (i), (iii) and (iv)

[D]. (i), (ii) and (iv)

9th Science MCQ on Atomic Number, Mass Number and Isotopes

Download App for Class 9

The Structure of the Atom Class 9 MCQ Online platform offers interactive quizzes that test knowledge on atomic number, mass number and isotopes. Class 9 Science Chapter 4 Objective Questions help students recognize how elements are classified based on atomic properties. The Structure of the Atom Class 9 Revision Questions focus on the periodic table, highlighting how isotopes influence the atomic weight of elements. By practicing Class 9 Science Chapter 4 Test Paper questions, students develop a precise understanding of nuclear composition and stability. These Structure of the Atom Class 9 Sample Questions also guide students in grasping the scientific methods used in isotope separation and radioactivity applications.

Q10. Which of the following statements about Rutherford’s model of atom are correct? (i) Considered the nucleus as positively charged (ii) Established that the a-particles are four times as heavy as a hydrogen atom (iii) Can be compared to solar system (iv) Was in agreement with Thomson’s model.

[A]. Only (i)

[B]. (i) and (iv)

[C]. (i) and (iii)

[D]. (ii) and (iii)

Q11. The ion of an element has 3 positive charges. Mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion?

[A]. 10

[B]. 13

[C]. 14

[D]. 16

Q12. Which of the following correctly represent the electronic distribution in the Mg atom?

[A]. 3, 8, 1

[B]. 2, 8, 2

[C]. 8, 2, 2

[D]. 1, 8, 3

Practical Applications Class 9 Science Chapter 4 MCQs

NCERT Book Class 9 Science Chapter 4 Self-Assessment allows students to evaluate their grasp of atomic principles through multiple-choice exercises. The Structure of the Atom Class 9 MCQs explore real-world applications of atomic theory, such as nuclear energy, radio-chemistry and semiconductor technology. Class 9 Science Chapter 4 MCQ PDF is an excellent resource for quick revision and concept clarity. Using Structure of the Atom Class 9 Quiz tools, students can engage in self-paced learning, reinforcing theoretical knowledge with practical insights. CBSE Class 9 Science Chapter 4 Multiple Choice Test resources help develop a scientific mindset, essential for students pursuing careers in physics, chemistry and engineering.

Q13. An atom with 3 protons and 4 neutrons will have a valency of

[A]. 1

[B]. 3

[C]. 4

[D]. 5

Q14. Rutherford’s a-particle scattering experiment showed that (i) Electrons have negative charge (ii) The mass and positive charge of the atom is concentrated in the nucleus (iii) Neutron exists in the nucleus (iv) Most of the space in an atom is empty. Which of the above statements are correct?

[A]. (i) and (iii)

[B]. (ii) and (iv)

[C]. (iii) and (iv)

[D]. (i) and (iv)

Why are Class 9 Science Chapter 4 MCQs important for understanding atomic structure?

Class 9 Science Chapter 4 MCQs are important because they help students develop a clear conceptual understanding of atomic structure. Multiple-choice questions test knowledge on fundamental topics like atomic number, mass number, electronic configuration and isotopes. These questions encourage critical thinking by presenting different answer choices, requiring students to recall facts and apply reasoning. Practicing Structure of the Atom Class 9 MCQs also enhances problem-solving skills, making it easier to tackle exams and competitive tests. By engaging with Class 9 Science Chapter 4 Practice Questions, students strengthen their grasp of Rutherford’s and Bohr’s models, leading to better academic performance in chemistry and physics.

How does solving Structure of the Atom Class 9 MCQs improve exam preparation?

Solving Structure of the Atom Class 9 MCQs helps students prepare effectively for exams by reinforcing their theoretical knowledge with practical application. The Structure of the Atom Class 9 Test Questions cover important topics like subatomic particles, valency and periodic trends, allowing students to familiarize themselves with commonly asked questions. Regular practice with Class 9 Science Chapter 4 Exam Questions improves speed and accuracy, essential for time management in exams. Structure of the Atom Class 9 Practice Test formats simulate real exam conditions, boosting confidence. Using Class 9 Science Chapter 4 MCQ PDF resources further aids revision, ensuring thorough subject mastery.

What are the best ways to study for Class 9 Science Chapter 4 using MCQs?

To study effectively for Class 9 Science Chapter 4, students should begin by understanding the core concepts of atomic structure. Using Class 9 Science Chapter 4 Multiple Choice Questions alongside textbooks helps reinforce theoretical knowledge. Attempting Structure of the Atom Class 9 Objective Type Questions daily builds familiarity with exam patterns. Engaging in Class 9 Science Chapter 4 Online Test sessions provides interactive learning experiences. Reviewing Structure of the Atom Class 9 Revision Questions ensures retention of key formulas and definitions. Downloading and practicing from Class 9 Science Chapter 4 MCQ PDF files allows for offline revision, making preparation more flexible and effective.