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

MCQ | Atoms and Molecules Class 9 | Part-1

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-1 )
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.	Choose the law of conservation of mass
	A.Mass neither be created nor formed
	B.Mass can neither be created nor reform
	C.Mass can neither be created nor destroyed
	D.Mass can neither be created nor alive

Ans: Mass can neither be created nor destroyed

Q2.	Energy can neither be created nor destroyed. it is a………………
	A.Energy recreation
	B.Energy is cannot reform
	C.Law of conservation of energy
	D.Law of conservation

Ans: Law of conservation of energy

Q3.	Choose incorrect sentence
	A.Energy can neither be created nor destroy
	B.In chemical substance elements present in definite proportion
	C.Ammonia molecule made by hydrogen and oxygen
	D.Water have not any particular texture

Ans: Ammonia molecule made by hydrogen and oxygen

Q4.	Smallest particle of matter called……….
	A.Tiny particle
	B.Tiny molecule
	C.Molecule
	D.Atom

Ans: Atom

Q5.	Atomic radius is measured in…………
	A.Kg
	B.cm
	C.Mm
	D.nm

Ans: nm

Q6.	1nm means how many meters?
	A.1/109 m
	B.1/108 m
	C.1/10-9 m
	D.1/10-8 m

Ans: 1/109 m

Q7.	1 meter means how many nanometers?
	A.109
	B.108
	C.107
	D.105

Ans: 109

Q8.	…………….. for some elements as proposed by Dalton.
	A.Shape
	B.Initiator
	C.Symbol
	D.Color

Ans: Symbol

Q9.	An international scientific organization which approves names of elements, symbol and unit called …………….
	A.Periodic table
	B.IUPAC nomenclature
	C.Name system
	D.None of the above

Ans: IUPAC nomenclature

Q10.	Choose incorrect option
	A.AL is the symbol of aluminium
	B.Ag is the symbol of silver
	C.Au is the symbol of gold
	D.All of the above

Ans: AL is the symbol of aluminium

Q11.	Symbol of copper
	A.Co
	B.C
	C.Coo
	D.Cu

Ans: Cu

Q12.	If 12 grams of carbon has n atoms, then the number of atoms in 12 grams of magnesium will be:
	A. 2n
	B. 3n
	C. n/2
	D. n

Ans: n/2

Q13.	Which of the following is correct pair of elements and its symbol?
	A. Silver – Si
	B. Sodium – So
	C. Potassium – Pt
	D. Sulphur – S

Ans: Sulphur – S

Q14.	A student heats 25g of reactant ‘A’ with 50g of reactant ‘B’. He obtains 50g of product ‘C’ and recovers 25 g of unreacted ‘B’. Which of the following law is confirmed in the following reaction?
	A. Law of constant proportion
	B. Law of conservation of mass
	C. Law of conservation of mass and Law of constant proportion
	D. Law of multiple proportion

Ans: Law of conservation of mass and Law of constant proportion

Q15.	How many moles are present in 40 g of He?
	A. 10 moles
	B. 11 moles
	C. 13 moles
	D. 12 moles

Ans: 10 moles

Q16.	Identify the symbol used to represent Avogadro’s number.
	A. M_A
	B. A_O
	C. A_N
	D. N_A

Ans: N_A

Q17.	Law of conservation of mass can be derived from which postulate of Dalton’s atomic theory?
	A. Atoms of a given element have same mass and chemical properties.
	B. Matter is made of tiny particles.
	C. Atom can neither be created nor destroyed.
	D. The relative number and kind of atoms are constant in a given compound.

Ans: Atom can neither be created nor destroyed.

Q18.	Valency of hydrogen is 1 and that of sulphur is 2. What should be the formula of hydrogen sulphide?
	A. HS
	B. H₂S₂
	C. HS₂
	D. H₂S

Ans: H₂S

Q19.	Calculate the number of Mg atoms in 0.024 g of Mg
	A. 6.022 × 10²¹ Mg atoms
	B. 6.22 × 10²³ Mg atoms
	C. 6.022 × 10²⁰ Mg atoms
	D. 6.022 × 10²⁵ Mg atoms

Ans: 6.022 × 10²⁰ Mg atoms

Q20.	Which of the following is the major drawback of Dalton’s atomic theory?
	A. Atoms of an element have exactly the same mass.
	B. Atoms are indivisible.
	C. Atoms of different elements have different masses.
	D. All of the above

Ans: Atoms are indivisible.

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