CBSE- Structure of Atom-MCQ

1.   The nucleons are

           I. Protons and electrons

          II. Neutrons and electrons

        III. Protons and neutrons

        IV. None of these

2.   The isotope deuterium of hydrogen has

           I. No neutrons and one proton

          II. One neutrons and two protons

        III. One electron and two neutron

        IV. One proton and one neutron

3.   The electrons present in the outermost shell are called

           I. Valency electrons

          II. Octate electrons

        III. Duplet electrons

        IV. Valence electrons

4.   An alpha particle contains

           I. 4 positive charge and 2 mass unit

          II. 2 positive charge and 4 mass unit

        III. 2 positive charge and 2 mass unit

        IV. 4 positive charge and 4 mass unit

5.   The atomic number of sodium is 11 and its mass number is 23. It has

           I. 11 neutrons and 12 protons

          II. 12 protons and 11 electrons

        III. 11 electrons and 12 neutrons

        IV. 12 electrons and 11 neutrons

6.   The electronic configuration of chlorine is

           I. 2,7

          II. 2,8,8,7

        III. 2,8,7

        IV. 2,7,8

7.   The isotope used to remove the brain tumours and treatment of cancer is

           I. U-235

          II. Na-24

        III. Iodine

        IV. C0-60

8.   In an alpha scattering experiment, few alpha particles rebounded because

           I. Most of the space in the atom is occupied

          II. Positive charge of the atoms very little space

        III. The mass of the atom is concentrated in the centre

        IV. All the positive charge and mass of the atom is concentrated in small volume

    1. III

    2. IV

    3. IV

    4. II

    5. III

    6. III

    7. IV

    8. II