Atomic Structure : Class 9 Science MCQ Practice Questions & Answers (Bengali)

Class 9 ScienceMediumChemistryAtomic StructureIsotopes

1.

Which of the following is an example of an element that exists as isotopes?

A

Hydrogen

B

Oxygen

C

Carbon

D

All of the mentioned

Class 9 ScienceMediumChemistryAtomic StructureAtomic Spectra

2.

What is the principal cause of the atomic spectra produced by elements?

A

Electrons jumping from lower to higher energy levels

B

Protons emitting radiation

C

Electrons moving in circular orbits

D

Electrons changing position within an orbital

Class 9 ScienceMediumChemistryAtomic StructureElectron Shells

3.

What is the maximum number of electrons in the third shell of an atom?

A

32

B

8

C

18

D

2

Class 9 ScienceMediumChemistryAtomic StructureAtomic Charge

4.

What is the charge of an atom that has 10 protons, 10 electrons, and 12 neutrons?

A

Positive

B

Negative

C

Neutral

D

Undefined

Class 9 ScienceMediumChemistryAtomic StructureAtomic Mass Unit

5.

What is the atomic mass unit (amu) based on?

A

Mass of carbon-12 isotope

B

Mass of a proton

C

Mass of a neutron

D

Mass of an electron

Class 9 ScienceMediumChemistryAtomic StructureElectron Configuration

6.

The electron configuration of sodium (Na) is 2, 8, 1. What is the number of electrons in the outermost shell of sodium?

A

10

B

2

C

1

D

8

Class 9 ScienceMediumChemistryAtomic StructureNucleus

7.

Which of the following particles are found in the nucleus of an atom?

A

Only neutrons

B

Electrons and neutrons

C

Protons and neutrons

D

Electrons and protons

Class 9 ScienceMediumChemistryAtomic StructureAtom

8.

What is an atom?

A

The smallest particle of an element

B

A particle of a compound

C

A type of molecule

D

A part of a molecule

Class 9 ScienceMediumScience ChemistryAtomic Structure

9.

The discovery of the neutron was made by?

A

Niels Bohr

B

James Chadwick

C

Ernest Rutherford

D

J.J. Thomson

Class 9 ScienceMediumScience ChemistryAtomic Structure

10.

Which part of the atom contains the protons and neutrons?

A

Nucleus

B

Electron cloud

C

Shells

D

Orbitals

Class 9 ScienceMediumScience ChemistryAtomic Structure

11.

What is the atomic number of an element with 6 protons and 6 electrons?

A

12

B

6

C

4

D

8

Class 9 ScienceMediumScience ChemistryAtomic Structure

12.

Which of the following elements has an atomic number of 6?

A

Hydrogen

B

Carbon

C

Nitrogen

D

Oxygen

Class 9 ScienceMediumScience ChemistryAtomic Structure

13.

What is the smallest particle of an element?

A

Proton

B

Molecule

C

Ion

D

Atom

Class 9 ScienceMediumChemistryAtomic Structure

14.

Which subatomic particle has a negative charge?

A

Neutron

B

Electron

C

Proton

D

Both proton and electron

Atomic Structure in Class 9 Science : Practice MCQ Questions & Answers with Explanations

Atomic Structure in Class 9 Science : Practice MCQ Questions & Answers with Explanations