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

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All questions answers in the last paragraph

MCQ Questions for Class 9 Science with Answers: Chemistry

Q1. Neutron Possesses

(A) Positive charge
(B) No charge
(C) Negative charge
(D) None of the above.

Q2. Who discovered the nucleus of an atom?

(A) J.J. Thomson
(B) Neils Bohr
(C) Rutherford
(D) J. Chadwick

Q3. An alpha particle is also known as:

(A) subatomic particle
(B) an unionised helium atom
(C) a neutral particle
(D) a doubly-charged helium ion

Q4. The number of electrons in an atom of Fluorine is 9. Its electronic configuration is

(A) 8, 1
(B) 7, 2
(C) 2, 7
(D) 1, 8

Q5. When a gas at reduced pressure is subjected to an electric discharge, the rays orignating from the negative electrode are–

(A) Cathode rays
(B) Anode rays
(C) x-rays
(D) Radiation ray

Q6. Rutherford’s ‘alpha (α) particles scattering experiment’ resulted in the discovery of

(A) electron
(B) proton
(C) nucleus in the atom
(D) atomic mass

Q7. Which scientist gave the concept of fixed energy levels around the nucleus?

(A) Ernest Rutherford
(B) Neils Bohar
(C) J.J.Thomsan
(D) None of these

Q8. The valence electrons of an element are reponsible for

(A) Physical properties of an element
(B) Chemical properties of an element
(C) Both the properties
(D) None of these

Q9. Though the three fundamental particles are present in almost all elements, one element does not possess:

(A) Proton
(B) Neutron
(C) Electron
(D) Nucleons

Q10. Which isotope is used in the nuclear power plants to generate electricity?

(A) Uranium 235
(B) Iodine 131
(C) Cobalt 60
(D) Uranium 238

Q11. How many electrons are present in M-shell of an element with atomic number 20?

(A) 5
(B) 8
(C) 12
(D) 18

Q12. Rutherford’s alpha-particle scattering experiment was responsible for the discovery of:

(A) Atomic nucleus
(B) Electron
(C) Proton
(D) Neutron

Q13. The number of valence electron in Na is –

(A) 1
(B) 2
(C) 3
(D) 4

Q14. Nucleous consist of:

(A) Proton and electron
(B) Proton and neutron
(C) Neutron and electron
(D) Only neutron

Q15. Cathode rays have

(A) Mass only
(B) Charge only
(C) Both mass and charge
(D) Neither mass nor charge

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