THE ATOMIC STRUCTURE By: Sir Amir Masood. 1. Passage of electricity through solutions by Faraday indicates the existence of: A) Proton B) Electron C) Neutron D) None of the above 2. Crookes’ tube or Discharge tube experiments where performed at low pressure to discover the presence of: A) Electron in an atom B) Proton in an atom C) Neutron in an atom D) Both electron and proton in an atom 3. Radioactivity confirmed the presence of: A) Electron B) Proton C) Neutron D) Electron and Proton both 4. The shape of p orbital is: A) Dumbbell B) Spherical C) Trigonal D) None of the above By: Sir Amir Masood. 5. The smallest fundamental particle of an atom with unit negative charge is called: A) Electron B) Proton C) Neutron D) Positron 6. A fundamental particle bearing a unit negative charge of 1.6 x 10-19 coulombs is called: A) Electron B) Proton C) Neutron D) None of the above 7. The passage of electric current through gases was performed by: A) Sir William Crookes B) Gold stem C) Sir J.J. Thompson D) All the above scientists 8. Neutrons were discovered by: A) Rutherford B) Sir J.J. Thompson C) Goldstein D) James Chadwick 9. Rutherford’s experiment of scattering of -particles showed that: A) No portion of the atom is empty B) Total mass of the atom is present outside the nucleus C) The size of nucleus is very big D) The positive charge is concentrated in the nucleus. 10. The nucleus of an atom contains: A) Electrons and neutrons B) Neutrons and protons C) Electrons and protons D) All the three fundamental particles 11. Atomic mass of an element is equal to: A) Number of electrons B) Number of protons C) Number of neutrons D) Number of protons and neutrons 12. natural radioactivity is confined it: A) Lighter elements B) Heavier elements C) Transition elements D) None of the above 13. Radioactivity was first observed by: A) Marie Curie B) Pierre Curie C) Henry Bequeral D) Rutherford 14. Radioactive rays consisting of streams of double positively charge particles are known as: A) -rays B) -rays C) -rays D) X-rays Radioactive rays which are non material in nature are called: By: Sir Amir Masood. 15. A) -rays B) -rays C) -rays D) None of the above 16. The rays which are intense ionizer of the gas: A) -rays B) -rays C) -rays D) None of the above 17. When cathode rays were passed through an electric field: A) They passed straight away B) They were deflected to the negatively charged plate C) They were deflected to the positively charged plate D) No phenomenon was observed 18. The spectrum in which the boundary lines are not distinctly marked is known as: A) Visible spectrum B) Atomic spectrum C) Line spectrum D) None of the above 19. X-rays were discovered by: A) Henry Bacqueral B) William Crookes C) William Roentgen D) Marie Curie By: Sir Amir Masood. 20. An orbital can accommodate a maximum number of: A) 2 electrons B) 4 electrons C) 6 electrons D) 10 electrons 21. An orbital can never occupy: A) 1 electrons B) 2 electrons C) 3 electrons D) 0 electrons 22. The number of orbital in L shell of an atom is: A) 1 B) 2 C) 4 D) 8 23. Which of the following atom will lose electron most readily: A) Li B) F C) Cl D) K By: Sir Amir Masood. 24. The quantum number which describes the shape of the orbital is called: A) Principal quantum number B) Azimuthal quantum number C) Magnetic quantum number D) Spin quantum number 25. No two electrons in the atom can have all the same values of quantum numbers. This is known as: A) Pauli Exclusion Principle B) Aufbau Principle B) Hund’s Rule C) n+l Rule 26. Which rule is violated in the following electronic configuration of Nitrogen 1s2, 2s2, 2px2, 2py1: A) Pauli Exclusion Principle B) Aufbau Principle B) Hund’s Rule C) n+l Rule 27. The energy released when an electron is added to the gaseous atom is called: A) Electron Affinity B) Ionization Potential C) Electronegativity D) Bond Energy 28. The power of an atom to attract a shared pair of electron is known as: A) Ionization Potential B) Electronegativity C) Electron Affinity D) None of the above When an electron jumps from lower to a higher orbit: By: Sir Amir Masood. 29. A) Energy is absorbed B) Energy is released C) Energy is not emitted or absorbed D) Spectrum is produced 30. Angular momentum is represented by: A) B) C) D) None of the above 31. The sub shell, which can accommodate a maximum number of 14 electrons is called: A) s B) p C) d D) f 32. An atom of potassium (K) consist of 19 electrons, 19 protons and 20 neutrons. The mass number of this atom is: A) 19 B) 20 C) 38 D) 39 33. Principle quantum number specifies: A) The energy level in which the electron is in B) The shape of the orbital C) Behaviour in magnetic field D) Spin of electron How many sub-shells are present in the M-shell: By: Sir Amir Masood. 34. A) 1 B) 2 C) 3 D) 4 35. Which shell is nearest to the nucleus of the atom: A) M B) N C) K D) L 36. On the basis of Hund’s rule the electronic configuration 1s2, 2s2, 2px1, 2py1, 2pz1 represents: A) Oxygen B) Nitrogen C) Fluorine D) Bromine 37. An atom having electronic configuration 2,8,7 is most likely to show a valency of: A) +1 B) -1 C) +7 D) -7 38. An atom becomes Anion by: A) Losing one or more electrons B) Gaining one or more electrons C) Sharing a pair of electrons D) None of the above 39. The knowledge of electro-negativities of elements helps in: A) Knowing the nature of bond B) Calculation of bond length C) Both of the above D) None of the above 40. Which of the following group of elements will form Anions readily: A) F, Cl, Br B) Li, Na, K C) O, S, Se D) N, P, As 41. The emission of a -particle from the nucleus raises the positive charge by: A) One B) Two C)Three D) Four By: Sir Amir Masood. 42. When a stable element is bombarded with -particle its nucleus is disintegrated and it emits radiation. This is known as: A) Natural radioactivity B) Artificial radioactivity C) Nuclear fission D) None of the above 43. Which of the following has maximum electronegativity: A) Cl B) F C) O D) N 44. Which is the true order of electronegativity: A) F>Cl>Br>I B) FI D) F
Posted on: Tue, 30 Dec 2014 08:28:15 +0000
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