Class 9 Science MCQ Chapter 4 Structure of the Atom

Class 9 Science MCQ Chapter 4 Structure of the Atom, Class 9 Science MCQ Question Answer, Class 9 Science Multiple Choice Question Answer to each chapter is provided in the list of SCERT Science Class 9 Objective Types Question Answer so that you can easily browse through different chapters and select needs one. Class 9 Science MCQ Chapter 4 Structure of the Atom Question Answer can be of great value to excel in the examination.

SCERT Class 9 Science MCQ Chapter 4 Structure of the Atom

SCERT Class 9 Science MCQ Chapter 4 Structure of the Atom Notes covers all the exercise questions in SCERT Science Textbooks. The NCERT Class 9 Science MCQ Chapter 4 Structure of the Atom provided here ensures a smooth and easy understanding of all the concepts. Understand the concepts behind every chapter and score well in the board exams.

Structure of the Atom

Chapter – 4

Multiple Choice Questions & Answers

1. Particles are doubly – charged – 

(a) hydrogen ions 

(b) Helium ions 

(c) Lithium ions 

(d) Boron ions

Ans. (b) Helium ions .

2. In Rutherford’s experiment, he was taken gold foil. This gold foil was about

(a) 1000 atoms thick

(b) 2000 atoms thick

(c) 3000 atoms thick

(d) 4000 atoms thick

Ans. (a) 1000 atoms thick.

3. The mass of a particle has

(a) 2u

(b) 3u

(c) 4u

(d) 5u

Ans. (c) 4u.

4. the mass of proton has approximately

(a) 5000 times of the electrons

(b) 4000 times of the electrons

(c) 3000 times of the electrons

(d) 2000 times of the electrons 

Ans. (d) 2000 times of the electrons.

5. Who was the first one to propose a model for the structure of an atom. 

(a) J J Thomson 

(b) Rudherford 

(c) E. Goldstein 

(d) Bohr  

Ans. (a) J J Thomson.

6. In Rutherford’s experiment, A very small fraction of a particles were deflected by – 

(a) 60⁰ 

(b) 90⁰

(c) 120⁰ 

(d) 180⁰

Ans. (d) 180⁰.

7. Which of the following energy level is correct respectively?

(a) LKMN 

(b) HKLMN

(c) KLMN 

(d) JKLMN

Ans. (c) KLMN.

8. The formula of the maximum number of electrons present in a shell is

(a) 3n² 

(b) 2n²

(c) 3n 

(d) 2n

(Where is the number orbit)

Ans. (b) 2n².

9. What is the maximum number of electron in N shell?

(a) 32 

(b) 18 

(c) 10 

(d) 2

Ans. (a) 32.

10. What is the maximum number of electron in L shell?

(a) 32 

(b) 10

(c) 18 

(d) 8

Ans. (d) 8.

11. The maximum number of electrons that can be accommodated in the outer most orbit is —

(a) 10 

(b) 8 

(c) 6 

(d) 4

Ans. (b) 8.

12. An atom has 8 electrons in outermost orbit. What is its valency?

(a) 0 

(b) 1

(c) 2 

(d) 3

Ans. (a) 0

13. An atom has 1 electron is outermost orbit. What is its valency?

(a) 0 

(b) 1

(c) 2 

(d) 3

Ans. (b) 1

14. An atoms has 7 electron in outermost orbit. What is its valency?

(a) 3 

(b) 2

(c) 1 

(d) 0

Ans. (c) 1

15. Who discovered neutron?

(a) Neils Bohr 

(b) J. Chadwick

(c) Dalton 

(d) E. Goldstein

Ans. (b) J. Chadwick.