Find here the NCERT Book Multiple Choice Questions from Class 9 Science book with Answers Pdf free download as per CBSE new exam pattern. This may assist you to understand and check your knowledge about the chapters. Students also can take a free test of the Multiple Choice Questions of Class 9 Science. Each question has four options followed by the right answer. These MCQ Questions are selected supported by the newest exam pattern as announced by CBSE.
Q1.Rutherford’s ‘alpha (α) particles scattering experiment’ resulted in the discovery of
(a) electron
(b) proton
(c) nucleus in the atom
(d) atomic mass
Answer: (b) atomic mass
Q2.Which of the following correctly represents the electronic distribution in the Mg atom?
(a) 3, 8, 1
(b) 2, 8, 2
(c) 1, 8, 3
(d) 8, 2, 2
Answer: (b) 2, 8, 2
Q3.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?
(a) 13
(b) 10
(c) 14
(d) 16
Answer: (b) 10
Q4.The first model of an atom was given by
(a) N. Bohr
(b) E. Goldstein
(c) Rutherford
(d) J.J. Thomson
Answer: (d) J.J. Thomson
Q5.Which of the following statement is always correct?
(a) An atom has equal number of electrons and protons.
(b) An atom has equal number of electrons and neutrons.
(c) An atom has equal number of protons and neutrons.
(d) An atom has equal number of electrons, protons and neutrons.
Answer: (a)
Q6.Which of the following isotope is used in the treatment of blood cancer?
(a) P-32
(b) I-131
(c) Co-60
(d) any of these
Answer: (a) P-32
Q7.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
Answer: (d) a doubly-charged helium ion
Q8. What prevents an atom from being collapsed?
(a) The nuclear forces
(b) Movement of electrons in discrete energy levels
(c) The electron-electron repulsions
(d) All of these
Answer. (b) Movement of electrons in discrete energy levels
Q9. Which of the following pairs are isobars?
(a) 17Cl35 & 17Cl37
(b) 18Ar40 & 20Ca40
(c) 6C12 & 6C14
(d) None of these
Answer. (b) 18Ar40 & 20Ca40
Q10. Which radioactive element is used in the treatment of cancer?
(a) Iodine-131
(b) Uranium-234
(c) Plutonium-239
(d) Cobalt-60
Answer. (d) Cobalt-60
Q11. Which of the following is an incorrect statement in reference with observation in Rutherford’s α-particle scattering experiment?
(a) Some of the α-particles rebound after hitting the gold foil
(b) Some of the particles deflected from their path
(c) Some of the particles not pass through the gold foil
(d) Most of the particles pass straight through the gold foil
Answer. (a) Some of the α-particles rebound after hitting the gold foil
Q12. Which of the following is an incorrect statement in reference with observation in Rutherford’s α-particle scattering experiment?
(a) Some of the α-particles rebound after hitting the gold foil
(b) Some of the particles deflected from their path
(c) Some of the particles not pass through the gold foil
(d) Most of the particles pass straight through the gold foil
Answer. (a) Some of the α-particles rebound after hitting the gold foil
Q13. 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
Answer. (b) Neils Bohar
Q14. Which of the two will be chemically more reactive, Sulphur(S) with atomic number 16 or Chlorine (Cl) with atomic number 17?
(a) Chlorine
(b) Sulphur
(c) Both are equally reactive
(d) Can’t say
Answer. (a) Chlorine
Q15.How many electrons are present in M-shell of an element with atomic number 20?
(a) 5
(b) 8
(c) 12
(d) 18
Answer: (b) 8
Q16. What property of an element determines its chemical behaviour?
(a) Size of an element
(b) Valency of an element
(c) Molar mass of the element
(d) None of these
Answer. (b) Valency of an element
Q17. What prevents an atom from being collapsed?
(a) The nuclear forces
(b) Movement of electrons in discrete energy levels
(c) The electron-electron repulsions
(d) All of these
Answer. (b) Movement of electrons in discrete energy levels
Q18.The charge on an electron is equal to:
(a) 1.6 × 10-19 C of -ve charge
(b) 2.6 × 10-19 C of -ve charge
(c) 1.6 × 10-22 C of -ve charge
(d) 1.6 × 10-23 C of -ve charge
Answer: (a) 1.6 × 10-19 C of -ve charge
Q19.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
Answer: (d) a doubly-charged helium ion
Q20.Isobars do not differ in the number of
(a) protons
(b) electrons
(c) neutrons
(d) nucleons
Answer: (d) nucleons
Class 9 Science Chemistry MCQ
| Chapter 1 Matter in Our Surroundings |
| Chapter 2: Is Matter Around Us Pure |
| Chapter 3: Atoms and Molecules |
| Chapter 4: Structure of the Atom |
Class 9 Science Biology MCQ
| Chapter 5: The Fundamental Unit of Life |
| Chapter 6: Tissues |
| Chapter 7: Diversity in Living Organisms |
| Chapter 13: Why do we Fall Ill |
| Chapter 14: Natural Resources |
| Chapter 15: Improvement in Food Resources |
Class 9 Science Physics MCQ
| Chapter 8: Motion |
| Chapter 9: Force and Laws of Motion |
| Chapter 10: Gravitation |
| Chapter 11: Work and Energy |
| Chapter 12: Sound |
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