Structure of atom Quiz

Structure of atom

Quiz

 

1. Who discovered the electron?
   1.   Rutherford
   2.   Chadwick
   3.   Thomson
   4.   Goldstein
2. . Why was the Thomson’s Model of an atom failed?
   i. It could not explain the screening of negative charges from that of positive
   ii. It did not tell about the presence of electrons
   iii. It did not give an idea about the discrete energy levels
   iv. It explained the atom as a whole to be electrically neutral
   Choose the correct option from the following:
   1.   Only (iii)
   2.   Both (i) & (iii)
   3.   Only (i)
   4.   Both (ii) & (iv)
3. In an alpha scattering experiment, few alpha particles rebounded because
   1.   Most of the space in the atom is occupied
   2.   Positive charge of the atoms very little space
   3.   The mass of the atom is concentrated in the centre
   4.   All the positive charge and mass of the atom is concentrated in small volume
4. What was the source of alpha particles in Rutherford scattering experiment?
   1.   Hydrogen nucleus
   2.   Argon nucleus
   3.   Helium nucleus
   4.   None of these
5. An alpha particle contains
   1.   4 positive charge and 2 mass unit
   2.   2 positive charge and 4 mass unit
   3.   2 positive charge and 2 mass unit
   4.   4 positive charge and 4 mass unit
6. The nucleons are
   1.   Protons and electrons
   2.   Neutrons and electrons
   3.   Protons and neutrons
   4.   None of these
7. Rutherford’s ‘alpha (α) particles scattering experiment’ resulted in the discovery of
   1.   electron
      (b)
      (c)
      (d)
   2.   proton
   3.   nucleus in the atom
   4.   atomic mass
8. Which of the following correctly represents the electronic distribution in the Mg atom?
   1.   3, 8, 1
   2.   2, 8, 2
   3.   1, 8, 3
   4.   8, 2, 2
9. The isotope deuterium of hydrogen has
   1.   No neutrons and one proton
   2.   One neutrons and two protons
   3.   One electron and two neutron
   4.   One proton and one neutron
10. The electrons present in the outermost shell are called
    1.   Valency electrons
    2.   Octate electrons
    3.   Duplet electrons
    4.   Valence electrons
11. The atomic number of sodium is 11 and its mass number is 23. It has
    1.   11 neutrons and 12 protons
    2.   12 protons and 11 electrons
    3.   11 electrons and 12 neutrons
    4.   12 electrons and 11 neutrons
12. The electronic configuration of chlorine is
    1.   2,7
    2.   2,8,8,7
    3.   2,8,7
    4.   2,7,8
13. The isotope used to remove the brain tumours and treatment of cancer is
    1.   U-235
    2.   Na-24
    3.   Iodine-131
    4.   Co-60
14. Which of the following are true for an element?
    (i) Atomic number = number of protons + number of electrons
    (ii) Mass number = number of protons + number of neutrons
    (iii) Atomic mass = number of protons = number of neutrons
    (iv) Atomic number = number of protons = number of electrons
    1.   (i) and (ii)
    2.   (i) and (iii)
    3.   (ii) and (iii)
    4.   (ii) and (iv)
15. 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?
    1.   13
    2.   10
    3.   14
    4.   16
16. The first model of an atom was given by
    1.   N. Bohr
    2.   E. Goldstein
    3.   Rutherford
    4.   J.J. Thomson
17. An atom with 3 protons and 4 neutrons will have a valency of
    1.   3
    2.   7
    3.   1
    4.   4
18. The ------------ is the sum of the number of protons and neutrons in an atom.
    1.   Isobar
    2.   Atomic mass number
    3.   isotone
    4.   Atomic number
19. How many electrons are present in M-shell of an element with atomic number 20?
    1.   5
    2.   8
    3.   12
    4.   18
20. Which scientist gave the concept of fixed energy levels around the nucleus?
    1.   Ernest Rutherford
    2.   Neils Bohr
    3.   J.J.Thomsan
    4.   None of these
21. What prevents an atom from being collapsed?
    1.   The nuclear forces
    2.   Movement of electrons in discrete energy levels
    3.   The electron-electron repulsions
    4.   All of these
22. Which of the following is an incorrect statement in reference with observation in Rutherford’s α-particle scattering experiment?
    1.   Some of the α-particles rebound after hitting the gold foil (a few α-particles)
    2.   Some of the particles deflected from their path
    3.   Some of the particles not pass through the gold foil
    4.   Most of the particles pass straight through the gold foil
23. Why do most of the elements try to participate in the chemical combinations?
    i. To gain more electrons
    ii. To achieve Inert Gas configuration
    iii. To complete their octet
    iv. To complete their inner shells
    Choose the correct option among the following
    1.   Both (i) & (iii)
    2.   Both (ii) & (iii)
    3.   Only (ii)
    4.   Both (i) & (iv)
24. An alpha particle is also known as:
    1.   subatomic particle
    2.   an unionised helium atom
    3.   a neutral particle
    4.   a doubly (+)ve charged helium ion
25. Which of the following isotope is used in the treatment of blood cancer?
    1.   P-32
    2.   I-131
    3.   Co-60
    4.   any of these
26. Isobars do not differ in the number of
    1.   protons
    2.   electrons
    3.   neutrons
    4.   nucleons
27. Cathode rays consist of negatively charged particles known as ………………
    1.   Electrons
    2.   protons
    3.   Neutrons
    4.   None of these
28. Canal rays consist of negatively charged particles known as ………………
    1.   Electrons
    2.   Protons
    3.   Neutrons
    4.   Neutrino
29. ……………. are the atoms containing same number of neutrons.
    1.   isotones
    2.   Isobars
    3.   isotopes
    4.   None of these
30. The maximum number of electrons in a shell is given by ……………..
    1.   2n²
    2.   n²
    3.   3n²
    4.   4n²
31. Neutrons were discovered by …………….
    1.   Ernest Rutherford
    2.   Neils Bohar
    3.   J.J.Thomsan
    4.   James Chadwick
32. -------------used for treatment of Goitre disease.
    1.   Co-60
    2.   I-131
    3.   U-235
    4.   P-34