MCQ Questions | Class 9 Science Chapter 3 | Atoms and Molecules with Answers

MCQ | Atoms and Molecules Class 9 | Part-2

Check the below NCERT MCQ Questions for Class 9 Science Chapter 3 Atoms and Molecules with Answers Pdf free download. MCQ Questions for Class 9 Science with Answers were prepared based on the latest exam pattern. We have Provided Atoms and Molecules 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:	3 ( Part-2 )
Chapters Name:	Atoms and Molecules
Medium:	English

Ncert Solutions for Class 9 Science | Objective Type Questions

You can refer to NCERT Solutions for Class 9 Science Chapter 3 Atoms and Molecules to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

Atoms and Molecules | Class 9 Science | NCERT Solutions

Q1.	One atomic mass unit is a mass unit equal to exactly one twelfth (1/12th) the mass of one atom of ___________.
	A. Carbon-12
	B. Nitrogen -14
	C. Carbon-1
	D. Silicon-14

Ans: Carbon-12

Q2.	If all the reactants in a chemical reaction are completely used, which of the following statements accurately describes the relationship between the reactants and the products?
	A. The reactants must contain more complex molecules than the products do.
	B. The products must have different physical state than the reactants.
	C. The total mass of the reactants must equal the total mass of the products.
	D. The density of the reactants must equal the density of the products.

Ans: The total mass of the reactants must equal the total mass of the products.

Q3.	One mole of molecules may not be equal to:
	A. 6.022 x 10²³ number of molecules
	B. Given number of particles (N)
	C. Avogadro number
	D. Molecular mass in grams

Ans: Given number of particles (N)

Q4.	9 grams of water decompose to give:
	A. 4g oxygen and 16g hydrogen
	B. 2g hydrogen and 1g oxygen
	C. 8g oxygen and 1g hydrogen
	D. none

Ans: 8g oxygen and 1g hydrogen

Q5.	Who gave the Law of constant proportions?
	A. Cavendish
	B. Proust
	C. Dalton
	D. Lavoisier

Ans: Proust

Q6.	Symbol of iron
	A.I
	B.Ir
	C.Fe
	D.Fi

Ans: Fe

Q7.	Symbol of sodium
	A.Na
	B.So
	C.S
	D.No

Ans: Na

Q8.	Choose the correct option
	A.Na is a symbol of nitrogen
	B.Proton contain positive charge
	C.Electron is present in nucleus
	D.Su is the symbol of sulphur

Ans: Proton contain positive charge

Q9.	How to calculate molecular mass.
	A.Sum of proton number and electron number
	B.Multiplication of proton number and electron number
	C.Sum of proton number and neutron number
	D.Multiplication of proton number and neutron number

Ans: Sum of proton number and neutron number

Q10.	Atomic number means?
	A.Number of electron
	B.Number of proton
	C.Number of neutron
	D.None of the above

Ans: Number of proton

Q11.	‘ amu’ is abbreviation of ………….. unit
	A.Weight
	B.Mass
	C.Volume
	D.Molecule

Ans: Mass

Q12.	Symbol of neon
	A.N
	B.Ni
	C.Ne
	D.None of the above

Ans: Ne

Q13.	Group of two or more atoms called………..
	A.Elements
	B.Molecules
	C.Complex
	D.None of the above

Ans: Molecules

Q14.	Which atoms exist by only one atom of that element.
	A.Gaseous
	B.Metals
	C.Nonmetals
	D.Noble gas

Ans: Noble gas

Q15.	Formula of ozone
	A.O₂
	B.O₃
	C.OH
	D.H₂

Ans: O₃

Q16.	According to Law of conservation of mass, mass of reactants wil be equal to the mass of:
	A. Catalysts
	B. Products
	C. Apparatus used for reaction
	D. Gases evolved

Ans: Products

Q17.	How do atoms usually exist in nature?
	A. In the form of molecules
	B. In the form of ions
	C. In the free state
	D. In the form of molecules and Ions

Ans: In the form of molecules and Ions

Q18.	What is the mass of 0.5 mole of Hydrogen atom
	A. 2.0 g
	B. 1.5 g
	C. 1 g
	D. 0.5 g

Ans: 0.5 g

Q19.	The number of atoms present in one molecule of an element is called as:
	A. Empirical formula
	B. Molecule
	C. Atomicity
	D. Compound

Ans: Atomicity

Q20.	Calculate the formula unit mass of ZnCl₂?
	A. 137 u
	B. 124 u
	C. 123 u
	D. 111 u

Ans: 137 u

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