MCQ Questions | Class 9 Science Chapter 4 | Structure of the Atom with Answers

MCQ | Structure of the Atom Class 9 | Part-2

Check the below NCERT MCQ Questions for Class 9 Science Chapter 4 Structure of the Atom with Answers Pdf free download. MCQ Questions for Class 9 Science with Answers were prepared based on the latest exam pattern. We have Provided Structure of the Atom Class 9 Science MCQs Questions with Answers to help students understand the concept very well.

Objective Question | NCERT Science Class 9

NCERT Solutions Class 9 Science
Book:	National Council of Educational Research and Training (NCERT)
Board:	Central Board of Secondary Education (CBSE)
Class:	9th
Subject:	Science
Chapter:	4 ( Part-2 )
Chapters Name:	Structure of the Atom
Medium:	English

Ncert Solutions for Class 9 Science | Objective Type Questions

You can refer to NCERT Solutions for Class 9 Science Chapter 4 Structure of the Atom to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

Structure of the Atom | Class 9 Science | NCERT Solutions

Q1.	Which of the following pairs have identical values of charge/mass?
	A. A proton and a deuterium
	B. A proton and a neutron
	C. A deuterium and an a-particle
	D. An electron and y-rays

Ans: A deuterium and an a-particle

Q2.	If Z = 6, what would be the valency of the element?
	A.6
	B.2
	C.4
	D.8

Ans: 4

Q3.	An atom with 3 protons and 4 neutrons will have a valency of
	A.3
	B.7
	C.1
	D.4

Ans: 1

Q4.	Bohr proposed that while revolving in discrete orbits, the electrons:
	A. Gain energy
	B. Lose energy
	C. Do not radiate energy
	D. First lose energy and then gain energy.

Ans: Do not radiate energy

Q5.	Sum of proton and neutron gives……………………. Of molecule
	A.Atomic number
	B.Atomic unit
	C.Molecular formula
	D.Molecular weight

Ans: Molecular weight

Q6.	Atomic number means?
	A.Proton number
	B.Neutron number
	C.Proton and neutron number
	D.Electron and proton number

Ans: Proton number

Q7.	How many electrons occupy in K shell?
	A.1
	B.2
	C.4
	D.8

Ans: 2

Q8.	How many electrons occupy in M shell?
	A.1
	B.8
	C.18
	D.32

Ans: 18

Q9.	The maximum number of electrons present in shells is given by the below formula
	A.2n
	B.2n²
	C.2n^*2
	D.2n³

Ans: 2n²

Q10.	How many electron present in outermost shell of lithium atom.
	A.1
	B.2
	C.3
	D.5

Ans: 1

Q11.	How many electron present in outermost shell of Al atom.
	A.1
	B.2
	C.3
	D.5

Ans: 3

Q12.	How many electron present in outermost shell of C atom.
	A.1
	B.2
	C.3
	D.4

Ans: 4

Q13.	The electrons present in the outermost shell of atom are known as ……………..
	A.Charge
	B.Valence electron
	C.K shell
	D.M shell

Ans: Valence electron

Q14.	If the L shell accommodate by 8 electrons then valency of element is…………………
	A.5
	B.2
	C.6
	D.0

Ans: 0

Q15.	An neutral element A has 3 electrons, the atomic number of an element is _______.
	A.1
	B.2
	C.5
	D.3

Ans: 3

Q16.	Lighest particle is –
	A. Neutron
	B. Electron
	C. Proton
	D. None of these

Ans: Electron

Q17.	Argon has atomic number of 18 and mass number of 40. Calcium has atomic 20 and mass number 40. Calcium and argon are examples of _______.
	A. isotopes
	B. isobars
	C. isotones
	D. isochores

Ans: isobars

Q18.	The number of valence electron in Na is –
	A.1
	B.2
	C.3
	D.4

Ans: 1

Q19.	Why do isotopes have different physical properties?
	A. Isotopes of an element have different electronic configuration.
	B. Isotopes have same atomic number.
	C. Isotopes of an element have different mass number.
	D. Isotopes of an element have different atomic number.

Ans: Isotopes of an element have different mass number.

Q20.	The electronic configuration of Rb(37) will be
	A. 2 , 8 , 1 8 , 9
	B. 2 , 8 , 1 8 , 8 , 1
	C. 2, 8,8 ,1 8,1
	D. 2 ,8 ,1 8 ,1 ,8

Ans: 2 , 8 , 1 8 , 8 , 1

CBSE Solutions | Ncert Solutions Science Class 9

NCERT Solutions | MCQ Class 9 Science

NCERT | Class 9 Science Solutions

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MCQ Questions | Class 9 Science Chapter 4 | Structure of the Atom with Answers

MCQ | Structure of the Atom Class 9 | Part-2

Objective Question | NCERT Science Class 9

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Structure of the Atom | Class 9 Science | NCERT Solutions

CBSE Solutions | Ncert Solutions Science Class 9

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NCERT | Class 9 Science Solutions

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