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

MCQ | Structure of the Atom Class 9 | Part-3

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-3 )
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.	Mass number of element is –
	A. Number of protons in its nucleus
	B. Number of electrons and protons in the atom
	C. Number of neutrons and protons in the nucleus
	D. Number of neutrons in the nucleus

Ans: Number of neutrons and protons in the nucleus

Q2.	When a gas at reduced pressure is subjected to an electric discharge, the rays orignating from the negative electrode are–
	A. Cathode rays
	B. Anode rays
	C. x-rays
	D. Radiation ray

Ans: Cathode rays

Q3.	The increasing order of the energy levels in an atom is _______ .
	A. K > L > M > N
	B. L > M > N > K
	C. L < M < N < K
	D. K < L < M < N

Ans: K < L < M < N

Q4.	Atomic number is equal to:
	A. Number of protons + Number of electrons
	B. Number of protons
	C. Number of protons + Number of neutrons
	D. Number of neutrons

Ans: Number of protons

Q5.	Zero valence electron of element is always …………………….
	A.Halogen
	B.Metals
	C.Nonmetals
	D.Noble gaseous

Ans: Noble gaseous

Q6.	How many neutron present in hydrogen?
	A.1
	B.2
	C.3
	D.0

Ans: 0

Q7.	Number of electrons present in neon ?
	A.6
	B.8
	C.10
	D.5

Ans: 10

Q8.	Electronic Configuration of sodium atom
	A.2 8 2
	B.2 8 8
	C.2 8 1
	D.2 8 0

Ans: 2 8 1

Q9.	Electronic Configuration of Al atom
	A.2 8 2
	B.2 8 8
	C.2 8 1
	D.2 8 3

Ans: 2 8 3

Q10.	Valency of boron is……………
	A.2
	B.5
	C.1
	D.3

Ans: 3

Q11.	Valency of Argon is………………
	A.5
	B.8
	C.0
	D.2

Ans: 0

Q12.	An atom of each element has a definite combining capacity known as……………
	A.Tendency
	B.Charge
	C.Electronic configuration
	D.Valency

Ans: Valency

Q13.	Atomic number denoted by…..
	A.Na
	B.NA
	C.Z
	D.P

Ans: Z

Q14.	Z symbol is use for………..
	A.Atomic mass
	B.Atomic weight
	C.Proton number
	D.Neutron number

Ans: Proton number

Q15.	Z for carbon atom is ……………
	A.4
	B.5
	C.6
	D.8

Ans: 6

Q16.	…………………… is defined as the total number of protons present in the nucleus of atom
	A.Atomic mass
	B.Atomic number
	C.Proton weight
	D.Neutron number

Ans: Atomic number

Q17.	Carbon atom has molecular weight 12u, and proton number is 6u, so what is neutron number ?
	A.5
	B.3
	C.2
	D.6

Ans: 6

Q18.	Mass of Aluminium is 26 so how many proton present in the molecule?
	A.11
	B.12
	C.13
	D.None of the above

Ans: 13

Q19.	Some elements having same atomic number but different mass number this is happened due to….
	A.Different proton number
	B.Different mass
	C.Different electron number
	D.Different neutron number

Ans: Different neutron number

Q20.	Below Which isotopes is not from hydrogen family?
	A.Protium
	B.Deuterium
	C.Tritium
	D.None of the above

Ans: None of the above

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