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

MCQ | Structure of the Atom Class 9 | Part-4

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-4 )
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.	Protium is a isotope of
	A.Chlorine
	B.Promodium
	C.Phosphorus
	D.Hydrogen

Ans: Hydrogen

Q2.	………………….. having similar chemical property but different physical property
	A.Protons
	B.Molar mass
	C.Isotopes
	D.None of the above

Ans: Isotopes

Q3.	Choose incorrect option
	A.Isotope of uranium used as fuel in nuclear reactor
	B.Isotope of cobalt is used in food preservatives
	C.Isotopes of iodine is used for treatment of goitre
	D.Isotope of ‘Co’ used in the treatment of cancer

Ans: Isotope of cobalt is used in food preservatives

Q4.	Element having different atomic number but same mass number called
	A.Proton
	B.Isotope
	C.Isoform
	D.Isobar

Ans: Isobar

Q5.	Neutron is a fundamental particle which have–
	A. +1 unit charge and 1 unit mass
	B. No charge and 1 unit mass
	C. Have no charge and mass
	D. Have –1 unit charge and 1 unit mass

Ans: No charge and 1 unit mass

Q6.	The atomic number of an element having mass number 23 and number of neutron 12 is ________.
	A.23
	B.11
	C.12
	D.35

Ans: 11

Q7.	Which form of iodine is used for the treatment of goiter?
	A. An isotone
	B. An isobar
	C. An isochore
	D. An isotope

Ans: An isotope

Q8.	According to the Dalton's atomic theory –
	A. Electrons, proton and neutron are found in atom
	B. Atom is indivisible
	C. Atom of various element have same properties
	D. Atoms are destroyed in the chemical reaction

Ans: Atom is indivisible

Q9.	The maximum number of electrons that can be accomodated in an orbit is given by the formula _______ where n is the number of orbit.
	A. 2n + 2
	B. 2(n + 2)
	C. 2/n²
	D. 2n²

Ans: 2n²

Q10.	An atom which has a mass number of 14 or 8 neutrons is–
	A. Isotope of oxygen
	B. Isobar of oxygen
	C. Isotope of carbon
	D. Isobar of carbon

Ans: Isotope of carbon

Q11.	What is a valence shell?
	A. Third shell
	B. First shell
	C. Outermost shell
	D. Second shell

Ans: Outermost shell

Q12.	The electron should be filled in the orbital in accordance with the increasing order of their energy. This statement is related with
	A. Affbau principle
	B. Pauli principle
	C. Hund's principle
	D. Plank's rules

Ans: Affbau principle

Q13.	Which of the following statement 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 neutron

Ans: An atom has equal number of electrons and protons.

Q14.	Element having 11 atomic number , find out its electron number
	A.5
	B.6
	C.10
	D.11

Ans: 11

Q15.	Element having 1 mass number then what is its atomic number?
	A.2
	B.3
	C.4
	D.1

Ans: 1

Q16.	Atomic mass number of B is 11 what is its neutron number?
	A.5
	B.6
	C.4
	D.11

Ans: 6

Q17.	Atomic number of fluorine
	A.7
	B.8
	C.9
	D.10

Ans: 9

Q18.	Symbol of beryllium
	A.B
	B.Be
	C.Br
	D.None of the above

Ans: Be

Q19.	L shell is a outermost orbit of fluorine, so what is its valency ?
	A.6
	B.8
	C.0
	D.1

Ans: 1

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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-4

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