Test: Rutherford's Model of an Atom


5 Questions MCQ Test Science Class 9 | Test: Rutherford's Model of an Atom


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QUESTION: 1

What did Rutherford conclude from his gold foil experiment?

Solution:

The conclusion of Rutherford from his α-ray experiment are:

(i) Most of the space inside the atom is empty because most of the alpha-particles passed through the gold foil without getting deflected.

(ii) Very few particles were deflected from their path, indicating that the positive charge of the atom occupies very little space.

(iii) A very small fraction of alpha-particles were deflected by 180∘, 

indicating that all the positive charges and mass of the gold atom were concentrated in a very small volume within the atom.


From the data he also calculated that the radius of the nucleus is about 105 times less than the radius of the atom.

QUESTION: 2

Which of the following is not a part of the observations made by Rutherford in his experiment?

Solution:

Only a few particles bounced back because the nucleus is so small / atom is mostly empty space that few collided with a nucleus . If they bounced back it was because of alpha particle and nucleus are positive : repulsion if they bounced back it was because nucleus is massive / dense so alpha particles rebound . "

QUESTION: 3

The radius of the nucleus is about ______ times less than the radius of the atom.

Solution:
  1. Most of the space inside the atom is empty because most of the α-particles passed through the gold foil without getting deflected.
  2. Very few particles were deflected from their path, indicating that the positive charge of the atom occupies very little space.
  3. A very small fraction of α-particles were deflected by very large angles, indicating that all the positive charge and mass of the gold atom were concentrated in a very small volume within the atom.

From the data he also calculated that the radius of the nucleus is about 105 times less than the radius of the atom.

QUESTION: 4

Which one of the following statements is true according to Rutherford’s nuclear model of an atom?

Solution:

On the basis of scattering experiments, Rutherford proposed the model of an atom, which is known as the nuclear atomic model. According to this model -
(i) An atom consists of a heavy positively charged nucleus where all the protons are present.
(ii) There is a positively charged centre in an atom called the nucleus. Nearly all the mass of an atom resides in the nucleus.
(iii) The electrons revolve around the nucleus in well-defined orbits.

QUESTION: 5

Most of the alpha particles passed through the gold foil without deflection because:

Solution:

Most of the alpha particles passed through the gold foil undeflected because most of the space inside the atom is empty.

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