Atoms and Nuclei

"Time to Challenge Your Brain!"

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Question 1

Which of the following is the main postulate of Thomson's Atomic Model?

  • Atoms are indivisible.

  • Electrons move in fixed orbits around the nucleus.

  • Positively charged sphere with embedded electrons.

  • Atoms have a dense, positively charged nucleus.

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Question 2

In Rutherford’s alpha scattering experiment, the deflection of alpha particles was mainly due to:

  • Repulsion between the alpha particles and electrons.

  • The presence of neutrons in the nucleus

  • The positively charged nucleus

  • The presence of a negative charge on the alpha particles.

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Question 3

According to Bohr’s model, electrons revolve around the nucleus in:

  • Random orbits.

  • Fixed orbits with definite energy levels.

  • Orbits with changing energy.

  • Orbits that are not quantised.

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Question 4

The emission spectrum of hydrogen is explained by:

  • Bohr’s model of the atom

  • Thomson’s model of the atom.

  • Rutherford’s model of the atom.

  • The uncertainty principle.

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Question 5

Which of the following particles are emitted in alpha decay?

  • Electrons

  • Neutrons.

  • Alpha particles

  • Gamma rays

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Question 6

Beta decay involves the emission of which particle?

  • An electron

  • A positron

  • A proton

  • A neutron

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Question 7

Gamma radiation is:

  • A type of electromagnetic radiation

  • A high-energy proton

  • A particle that consists of a helium nucleus

  • A form of beta radiation

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Question 8

In Rutherford’s alpha scattering experiment, most of the alpha particles passed straight through the gold foil because:

  • The electrons were arranged symmetrically around the nucleus

  • The nucleus is very small compared to the size of the atom

  • The gold foil was too thin

  • The alpha particles were deflected by the electrons

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Question 9

The discovery of the neutron helped explain:

  • The mass of an atom

  • The colour of atomic spectra

  • The arrangement of electrons in shells

  • The existence of isotopes

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Question 10

A nuclear reaction in which an atom's nucleus emits an alpha particle is an example of:

  • Fission

  • Fusion

  • Alpha decay

  • Beta decay

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There are 10 questions to complete.

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