Structure of the Atom MCQ Questions for Class 9 Science Chapter 4 with Answers

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MCQ Questions for Class 9 Science with Answers: Chemistry

Q1. Who discovered the nucleus of an atom?

(i) J.J. Thomson
(ii) Neils Bohr
(iii) Rutherford
(iv) J. Chadwick

(iii) Rutherford

Q2. The number of electrons in an atom of Fluorine is 9. Its electronic configuration is

(i) 8, 1
(ii) 7, 2
(iii) 2, 7
(iv) 1, 8

(iii) 2, 7

Q3. Rutherford’s ‘alpha (α) particles scattering experiment’ resulted in the discovery of

(i) electron
(ii) proton
(iii) nucleus in the atom
(iv) atomic mass

(iii) nucleus in the atom

Q4. The valence electrons of an element are reponsible for

(i) Physical properties of an element
(ii) Chemical properties of an element
(iii) Both the properties
(iv) None of these

(ii) Chemical properties of an element

Q5. Which isotope is used in the nuclear power plants to generate electricity?

(i) Uranium 235
(ii) Iodine 131
(iii) Cobalt 60
(iv) Uranium 238

(i) Uranium 235

Q6. Rutherford’s alpha-particle scattering experiment was responsible for the discovery of:

(i) Atomic nucleus
(ii) Electron
(iii) Proton
(iv) Neutron

(i) Atomic nucleus

Q7. Nucleous consist of:

(i) Proton and electron
(ii) Proton and neutron
(iii) Neutron and electron
(iv) Only neutron

(ii) Proton and neutron

Q8. The ion of an element has 3 positive charges. Mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion?

(i) 13
(ii) 10
(iii) 14
(iv) 16

(ii) 10

Q9. Cathode rays have

(i) Mass only
(ii) Charge only
(iii) Both mass and charge
(iv) Neither mass nor charge

(iii) Both mass and charge

Q10. What was the source of alpha particles in Rutherford scattering experiment?

(i) Hydrogen nucleus
(ii) Argon nucleus
(iii) Helium nucleus
(iv) None of these

(iii) Helium nucleus

Q11. Which of the following is the correct electronic configuration of sodium ?

(i) 2, 8, 1
(ii) 8, 2, 1
(iii) 2, 1, 8
(iv) 2, 8, 2

(i) 2, 8, 1

Q12. Number of valence electrons in CP ion are:

(i) 16
(ii) 8
(iii) 17
(iv) 18

(ii) 8

Q13. If Z = 6, what would be the valency of the element?

(i) 6
(ii) 2
(iii) 4
(iv) 8

(iii) 4

Q14. The first model of an atom was given by

(i) N. Bohr
(ii) E. Goldstein
(iii) Rutherford
(iv) J.J. Thomson

(iv) J.J. Thomson

Q15. The nucleus of the hydrogen atom is called as

(i) Neutron
(ii) Electron
(iii) Proton
(iv) Nucleons

(iii) Proton

Q16. Which of the following does not match the characteristics of an Isotope?

(i) Isotopes of some elements are radioactive
(ii) Isotopes are the atoms of different elements
(iii) Isotopes differ in number of neutrons
(iv) Isotopes have similar chemical properties

(ii) Isotopes are the atoms of different elements

Q17. Goldstein’s experiments which involved passing high voltage electricity through gases at very low pressure resulted in the discovery of :

(i) electron
(ii) proton
(iii) nucleus
(ii) neutron

(ii) proton

Q18. Who used the term ‘ATOM’ for the first time?

(i) Rutherford
(ii) John Dalton
(iii) Chadwick
(iv) Bohr

(ii) John Dalton

Q19. An neutral element A has 3 electrons, the atomic number of an element is

(i) 1
(ii) 2
(iii) 5
(iv) 3

(iv) 3

Q20. Which of the following statement is always correct?

(i) An atom has equal number of electrons and protons.
(ii) An atom has equal number of electrons and neutrons.
(iii) An atom has equal number of protons and neutrons.
(iv) An atom has equal number of electrons, protons and neutrons.

(i) An atom has equal number of electrons and protons.

Q21. Which of the following particles was discovered first?

(i) Neutron
(ii) Electron
(iii) Proton
(iv) Meson

(ii) Electron

Q22. Which of the following elements does not exhibit the electrovalencey?

(i) Sodium
(ii) Calcium
(iii) Carbon
(iv) Chlorine

(iii) Carbon

Q23. Which of the following atom does not have the neutron?

(i) Carbon
(ii) Nitrogen
(iii) Hydrogen
(iv) Helium

(iii) Hydrogen

Q24. The number of valence electron in Na is –

(i) 1
(ii) 2
(iii) 3
(iv) 4

(i) 1

Q25. How many electrons are present in M-shell of an element with atomic number 20?

(i) 5
(ii) 8
(iii) 12
(iv) 18

(ii) 8

Q26. Though the three fundamental particles are present in almost all elements, one element does not possess:

(i) Proton
(ii) Neutron
(iii) Electron
(iv) Nucleons

(ii) Neutron

Q27. Which scientist gave the concept of fixed energy levels around the nucleus?

(i) Ernest Rutherford
(ii) Neils Bohar
(iii) J.J.Thomsan
(iv) None of these

(ii) Neils Bohar

Q28. When a gas at reduced pressure is subjected to an electric discharge, the rays orignating from the negative electrode are–

(i) Cathode rays
(ii) Anode rays
(iii) x-rays
(iv) Radiation ray

(i) Cathode rays

Q29. An alpha particle is also known as:

(i) subatomic particle
(ii) an unionised helium atom
(iii) a neutral particle
(iv) a doubly-charged helium ion

(iv) a doubly-charged helium ion

Q30. Neutron Possesses

(i) Positive charge
(ii) No charge
(iii) Negative charge
(iv) None of the above.

(ii) No charge

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