MCQ Discovery of Nucleus Chapter 4 Class 9 Science

MCQ’s For All Chapters – Science Class 9th

1. There will be total 14 MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying

1. What did Rutherford conclude from his gold foil experiment?

Alpha particles are much smaller than gold atoms.

Alpha-particles are doubly-charged helium ions.

Radius of the nucleus is about 10⁵ times less than the radius of the atom

Most of the Alpha-particles passed through the gold foil.

Your comments:

Question 1 of 14

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

Very few alpha particles deflected at small angles.

A large number of alpha particles bounced back completely.

Only a few alpha particles were scattered at large angles

Most alpha particles passed straight through gold foil.

Your comments:

Question 2 of 14

3. Radius of the nucleus is about _______ times less than the radius of the atom.

10^-15

10⁵

10^-5

10^-10

Your comments:

Question 3 of 14

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

There is a positively charged centre in an atom called the nucleus.

All the mass of an atom resides in the nucleus.

The electrons revolve around the nucleus in well-defined orbits.

All of the above

Your comments:

Question 4 of 14

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

Atoms are stable.

Most of the space inside the atom is empty.

Atoms are unstable.

All the space in the atom is covered by nucleus.

Your comments:

Question 5 of 14

6. According to Rutherford's model of atom, which subatomic particles revolve around the nucleus in well defined orbit?

Neutrons

Protons

Electrons

Quarks

Your comments:

Question 6 of 14

7. An alpha-particle has how many neutrons?

2

1

3

4

Your comments:

Question 7 of 14

8. In Rutherford's alpha particle scattering experiment, when fast moving alpha particles were made to fall on a thin gold foil then most of the alpha particles passed straight through the foil. Which of the given conclusion is correct?

Positive charge of the atom is concentrated in the centre of the atom.

Most of the space is occupied.

Positive charge and mass of the atom is distributed throughout the atom.

Most of the space inside the atom is empty.

Your comments:

Question 8 of 14

9. The part of an atom where nearly the entire mass of an atom is concentrated is:

Nucleus

Electron

Quark

Neutron

Your comments:

Question 9 of 14

10. During Rutherford's experiment some of the alpha-particles were deflected by the foil by small angles. What does this prove?

There is a positively charged body present in the atom.

Atom is very large in size.

Alpha-particles move in a straight line.

Alpha-particles are not electrically charged.

Your comments:

Question 10 of 14

11. ASSERTION-According to Rutherford’s experiment alpha particles are not deflected more than proton.

REASON-alpha particles are heavier than proton particles hence they deflect less.

a) Both Assertion and Reason are correct, and reason is the correct explanation for assertion.

b) Both Assertion and Reason are correct, and Reason is not the correct explanation for Assertion.

c) Assertion is true but Reason is false.

d.) Assertion is false but Reason is true.

Question 11 of 14

12. Assertion : The size of the nucleus is very small as compared to the size of the atom.
Reason : The electrons revolve around the nucleus of the atom.

a.) Both Assertion and Reason are correct, and reason is the correct explanation for assertion.

b.) Both Assertion and Reason are correct, and Reason is not the correct explanation for Assertion.

c.) Assertion is true but Reason is false.

d.) Assertion is false but Reason is true.

Question 12 of 14

13. Assertion : Thomson’s atomic model is known as the ‘raisin pudding’ model.
Reason : The atom is visualised as a pudding of positive charge with electrons (raisins) embedded in it.

a.) Both Assertion and Reason are correct, and reason is the correct explanation for assertion.

b.) Both Assertion and Reason are correct, and Reason is not the correct explanation for Assertion.

c.) Assertion is true but Reason is false.

d.) Assertion is false but Reason is true.

Question 13 of 14

14. Assertion : Anions are larger in size than the parent atom.
Reason : In an anion, the number of protons in the nucleus is less than the number of electrons moving around it.

a.) Both Assertion and Reason are correct, and reason is the correct explanation for assertion.

b.) Both Assertion and Reason are correct, and Reason is not the correct explanation for Assertion.

c.) Assertion is true but Reason is false.

d.) Assertion is false but Reason is true.

Question 14 of 14

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