Chapter 4: Structure of the Atom Assertion-Reason Questions | science Class 9 CBSE

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Chapter 4: Structure of the Atom Assertion-Reason Questions | science Class 9 CBSE | ByteNotes.in

Assertion-Reason

Check the statement and reason

A-R

Question 1

Logic Check

Assertion (A): Atoms are made up of subatomic particles. Reason (R): Discovery of electrons, protons, and neutrons proved that atoms are divisible.

Reasoning Options

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Assertion-Reason

Check the statement and reason

A-R

Question 2

Logic Check

Assertion (A): Electrons have negligible mass compared to protons. Reason (R): The mass of an electron is about 1/2000 that of a hydrogen atom.

Reasoning Options

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Assertion-Reason

Check the statement and reason

A-R

Question 3

Logic Check

Assertion (A): Canal rays led to the discovery of protons. Reason (R): Canal rays are positively charged particles discovered by E. Goldstein.

Reasoning Options

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Assertion-Reason

Check the statement and reason

A-R

Question 4

Logic Check

Assertion (A): According to Thomson, electrons are embedded in a positively charged sphere. Reason (R): Thomson’s model resembles a watermelon with seeds.

Reasoning Options

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Assertion-Reason

Check the statement and reason

A-R

Question 5

Logic Check

Assertion (A): Thomson’s atomic model was unable to explain scattering experiment results. Reason (R): It failed to account for a nucleus at the center of atoms.

Reasoning Options

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Assertion-Reason

Check the statement and reason

A-R

Question 6

Logic Check

Assertion (A): Most alpha particles passed straight through the gold foil in Rutherford’s experiment. Reason (R): Most of the space inside the atom is empty.

Reasoning Options

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Assertion-Reason

Check the statement and reason

A-R

Question 7

Logic Check

Assertion (A): Rutherford concluded that the positive charge of an atom is concentrated in a small region. Reason (R): Some alpha particles bounced back after striking the gold foil.

Reasoning Options

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Assertion-Reason

Check the statement and reason

A-R

Question 8

Logic Check

Assertion (A): Rutherford's model could not explain atom stability. Reason (R): Revolving electrons should radiate energy and fall into the nucleus.

Reasoning Options

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Assertion-Reason

Check the statement and reason

A-R

Question 9

Logic Check

Assertion (A): Bohr suggested electrons revolve in discrete orbits. Reason (R): In these orbits, electrons do not radiate energy.

Reasoning Options

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Assertion-Reason

Check the statement and reason

A-R

Question 10

Logic Check

Assertion (A): Neutrons have no charge. Reason (R): Neutrons were discovered by J. Chadwick in 1932 and are neutral subatomic particles.

Reasoning Options

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Chapter sections

Chapter 4: Structure of the Atom | Assertion-Reason

Assertion (A): Atoms are made up of subatomic particles. Reason (R): Discovery of electrons, protons, and neutrons proved that atoms are divisible.

Assertion (A): Electrons have negligible mass compared to protons. Reason (R): The mass of an electron is about 1/2000 that of a hydrogen atom.

Assertion (A): Canal rays led to the discovery of protons. Reason (R): Canal rays are positively charged particles discovered by E. Goldstein.

Assertion (A): According to Thomson, electrons are embedded in a positively charged sphere. Reason (R): Thomson’s model resembles a watermelon with seeds.

Assertion (A): Thomson’s atomic model was unable to explain scattering experiment results. Reason (R): It failed to account for a nucleus at the center of atoms.

Assertion (A): Most alpha particles passed straight through the gold foil in Rutherford’s experiment. Reason (R): Most of the space inside the atom is empty.

Assertion (A): Rutherford concluded that the positive charge of an atom is concentrated in a small region. Reason (R): Some alpha particles bounced back after striking the gold foil.

Assertion (A): Rutherford's model could not explain atom stability. Reason (R): Revolving electrons should radiate energy and fall into the nucleus.

Assertion (A): Bohr suggested electrons revolve in discrete orbits. Reason (R): In these orbits, electrons do not radiate energy.

Assertion (A): Neutrons have no charge. Reason (R): Neutrons were discovered by J. Chadwick in 1932 and are neutral subatomic particles.

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