Chapter 02 (Atomic Structure)

MCQ: If n = 3 we are in

  1. K shell
  2. L shell
  3. M shell
  4. f shell

MCQ: Water that contains H-2 atoms is called

  1. heavy water
  2. light water
  3. water
  4. none of above

MCQ: Electron revolves around nucleus in orbits which have

  1. variable energy
  2. fixed energy
  3. infinite energy
  4. zero energy

MCQ: In Rutherford’s experiment, α particles were deflected because of

  1. electrostatic repulsion between α particles and positively charged part of atom
  2. electrostatic attraction between α particles and positively charged part of atom
  3. electrostatic repulsion between β particles and positively charged part of atom
  4. electrostatic attraction between γ particles and positively charged part of atom

MCQ: Energy of an electron in orbit is proportional to

  1. distance between shells
  2. distance from nucleus
  3. distance between two nuclei
  4. positive charge inside nucleus

MCQ: According to Rutherford, most of space occupied by atom is

  1. filled
  2. partially filled
  3. empty
  4. none of above

MCQ: Electronic configuration is arrangement of electrons in

  1. nucleus
  2. shells
  3. both A and B
  4. sub-shells

MCQ: Electrons revolves only in those orbits with angular momentum as an

  1. half integral multiple of ‘h’
  2. integral multiple of ‘h’
  3. integral multiple of h ⁄ 2π
  4. half integral multiple of 2π

MCQ: After 3s sub-shell begin to fill is

  1. 3p
  2. 3d
  3. 3f
  4. none of above

MCQ: When an electron jumps from lower orbit to higher orbit

  1. light is emitted
  2. electrons are emitted
  3. electrons are absorbed
  4. light is absorbed

MCQ: Lowest energy orbital among following is

  1. 2s
  2. 2p
  3. 3s
  4. 3p

MCQ: When Uranium-238 emits α particles it decays in to

  1. Helium
  2. Carbon
  3. Thorium-234
  4. Uranium-235

MCQ: D sub-shell can accommodate maximum

  1. 2 electrons
  2. 10 electrons
  3. 14 electrons
  4. 6 electrons

MCQ: Chlorine-35 exists in nature about

  1. 0.35
  2. 0.4
  3. 0.5
  4. 0.75

MCQ: Protium has

  1. one neutron
  2. two neutrons
  3. no neutron
  4. 3 neutrons

MCQ: α particles are

  1. positively charged
  2. doubly positively charged
  3. negatively charged
  4. doubly negatively charged

MCQ: Energy of emitted light is equal to

  1. sum of energy levels
  2. difference between energies of orbits
  3. product of energies of orbits
  4. none of above

MCQ: Atoms having same atomic number but different atomic mass are

  1. same
  2. isotopes
  3. makes different elements
  4. effects chemical properties

MCQ: Rutherford bombarded thin gold foil with

  1. α particles
  2. β particles
  3. γ particles
  4. neutrons

MCQ: Iodine-123 is used to

  1. diagnose thyroid problem
  2. image the brain
  3. kill cancer cells
  4. trace the blood flow

MCQ: Helium is chemically

  1. active
  2. inert
  3. unstable
  4. none of above

MCQ: Bond formed by mutual sharing of electron is

  1. ionic bond
  2. coordinate covalent bond
  3. covalent bond
  4. none of above

MCQ: When atoms loose or gain electrons they acquire configuration of

  1. next noble gas
  2. halogens
  3. alkali metals
  4. alkaline metals

MCQ: Covalent compound among following is

  1. NaCl
  2. MgO
  3. H2O
  4. KF

MCQ: Melting point of table salt is

  1. 800°C
  2. 801°C
  3. 901°C
  4. 1000°C