MCQ On Class 12 Physics Chapter 12 Atoms

(1) The Bohr model of atoms

[A] assumes that the angular momentum of elec-trons is quantized.

[B] uses Einstein’s photoelectric equation.

[C] predicts continuous emission spectra for at-oms.

[D] predicts the same emission spectra for all types of atoms.

Answer: assumes that the angular momentum of elec-trons is quantized.

(2) The first spectral series was discovered by

[A] Balmer

[B] Lyman

[C] Paschen

[D] Pfund

Answer: Balmer

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(3) In the Geiger-Marsden scattering experiment the number of scattered particles detected are maximum and minimum at the scattering angles respectively at

[A] 0° and 180°

[B] 180° and 0°

[C] 90° and 180°

[D] 45° and 90°

Answer: 0° and 180°

(4) Which of the following spectral series falls within the visible range of electromagnetic radiation?

[A] Lyman series

[B] Balmer series

[C] Paschen seriee

[D] Pfund series

Answer: Balmer series

(5) In Geiger-Marsden scattering experiment, the trajectory traced by an a-particle depends on

[A] number of collision

[B] number of scattered a-particles

[C] impact parameter

[D] none of these

Answer: impact parameter

(6) Which of the following postulates of the Bohr model led to the quantization of energy of the hydrogen atom?

[A] The electron goes around the nucleus in circular orbits.

[B] The angular momentum of the electron can only be an integral multiple of h/2π.

[C] The magnitude of the linear momentum of the electron is quantized.

[D] Quantization of energy is itself a postulate of the Bohr model.

Answer: The angular momentum of the electron can only be an integral multiple of h/2π.

(7) If the radius of inner most electronic orbit of a hydrogen atom is 5.3 * 10~n m, then the radii of n = 2 orbits is

[A] 1.12 Å

[B] 2.12 Å

[C] 3.22 Å

[D] 4.54 Å

Answer: 2.12 Å

(8) In the Geiger-Marsden scattering experiment, is case of head-on collision the impact parameter should be

[A] maximum

[B] minimum

[C] infinite

[D] zero

Answer: maximum

(9) The first model of atom in 1898 was proposed by

[A] Ernst Rutherford

[B] Albert Einstein

[C] J.J. Thomson

[D] Niels Bohr

Answer: J.J. Thomson

(10) The diagram shows the energy levels for an electron in a certain atom. Which transition shown represents the emission of a photon with the most energy?

[A] I

[B] II

[C] III

[D] IV

Answer: III

(11) The total energy that will be released if a nucleus is built from its constituents is called the:

[A] binding energy of the nucleus

[B] binding energy of the solid

[C] binding energy of the atom

[D] None of these

Answer: binding energy of the nucleus

(12) Natural radioactivity was discovered by:

[A] Joliot

[B] Becquerel

[C] Pauli

[D] None of these

Answer: Becquerel

(13) The energy equivalent to mass defect is called :

[A] binding energy

[B] internal energy

[C] external energy

[D] enthalpy

Answer: binding energy

(14) P-decay produces:

[A] isobars

[B] isotopes

[C] isotones

[D] All the above

Answer: isobars

(15) Transmutation of nuclei was discovered by:

[A] Rutherford

[B] Becquerel

[C] Pauli

[D] None of these

Answer: Rutherford

(16) For ionization of excited Hydrogen atom, the, required energy is:

[A] a little less than 13.6

[B] equal to 13.6

[C] more than 13.6

[D] 3.4 or less

Answer: 3.4 or less

(17) The concept of electron spin was introduced by:

[A] Becquerel

[B] Goudsmit

[C] Millikan

[D] Uhlenbeek and Goudsmit

Answer: Uhlenbeek and Goudsmit

(18) The mass of a neutron is:

[A] 1.00866 u

[B] 1.0866 u

[C] 1.866 u

[D] 0.1866 u

Answer: 1.00866 u

(19) The energy equivalent to one atomic mass unit is :

[A] 1.6 × 10^-19 J

[B] 6.02 × 10²³ J

[C] 9.31 MeV

[D] 931 MeV

Answer: 931 MeV

(20) Half-life of a substance depends on:

[A] pressure

[B] temperature

[C] density

[D] None of these

Answer: None of these

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