12th physics chapter 12: full solution, notes, MCQ, & free PDF | Bihar board

Physics class 12
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12th physics chapter 12 Bihar board with NCERT-Details & Highlights

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12th physics chapter 12 all objective solutions – download PDF

1. The first model of atom in 1898 was proposed by

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    • (a) Ernst Rutherford
    • (b) Albert Einstein
    • (c) J.J. Thomson
    • (d) Niels Bohr

Answer: (c) J.J. Thomson

2. 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: (c) impact parameter

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: (a) 0° and 180°

4. 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: (a) maximum

5. Rutherford’s experiments suggested that the size of the nucleus is about

    • (a) 10-14 m to 10-12 m
    • (b) 10-15 m to 10-13 m
    • (c) 10-15 m to 10-14 m
    • (d) 10-15 m to 10-12 m

Answer: (c) 10-15 m to 10-14 m

6. 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: (b) Balmer series

7. The first spectral series was discovered by

    • (a) Balmer
    • (b) Lyman
    • (c) Paschen
    • (d) Pfund

Answer: (a) Balmer

8. 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: (b) The angular momentum of the electron can only be an integral multiple of h/2π.

9. 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: (a) assumes that the angular momentum of elec-trons is quantized.

10. The Bohr model of atoms : 

    • (A) assumes that the angular momentum of electrons is quantized
    • (B) uses Einstein’s photoelectric equation
    • (C) predicts continuous emission spectra for atoms
    • (D) predicts the same emission spectra for all types of atoms

Answer: (A) assumes that the angular momentum of electrons is quantized

bseb most important notes 12th physics chapter 12 

11. Who explained the splitting of special lines in magnetic field ?

    • (A) Zeeman
    • (B) Bohr
    • (C) Summerfield
    • (D) Einstein

Answer: (A) Zeeman 

12. The mass of a neutron is : 

    • (A) 1.00866 u
    • (B) 1.0866 u
    • (C) 1.866 u
    • (D) 0.1866 u

Answer: (A) 1.00866 u 

13. Half-life of a substance depends on: 

    • (A) pressure
    • (B) temperature
    • (C) density
    • (D) None of these

Answer: (D) None of these

14. The concept of electron spin was introduced by :

    • (A) Becquerel
    • (B) Goudsmit
    • (C) Millikan
    • (D) Uhlenbeck and Goudsmith

Answer: (D) Uhlenbeck and Goudsmith 

15. β-decay produces : 

    • (A) isobars
    • (B) isotopes
    • (C) isotones
    • (D) All the above

Answer: (A) isobars 

16. Transmutation of nuclei was discovered by : 

    • (A) Rutherford
    • (B) Becquerel
    • (C) Pauli
    • (D) None of these

Answer: (A) Rutherford 

17. The energy equivalent to mass defect is called : 

    • (A) binding energy
    • (B) internal energy
    • (C) external energy
    • (R) enthalpy

Answer: (A) binding energy

18. The binding energy of He is about : 

    • (A) 28.3 eV
    • (B) 28.3 Mev
    • (C) 28.3 J
    • (D) 2.83 Mev

Answer: (B) 28.3 Mev

19. The binding energy of a deuteron is about : 

    • (A) 2.22 MeV
    • (B) 2.22 J
    • (C) 2.22 eV
    • (D) None of these

Answer: (A) 2.22 MeV 

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20. Who discovered the positron ? 

    • (A) Chadwick
    • (B) Bohr
    • (C) Maxwell
    • (D) Anderson

Answer: (D) Anderson

21. The mass of proton is about : 

    • (A) 9.11 x 10-31 kg
    • (B) 9.11 x 10-30 kg .
    • (C) 1.66 x 10-27 kg
    • (D) 1 kg

Answer: (C) 1.66 x 10-27 kg

22. Chadwick was awarded the Nobel Prize in Physics in 1935 for his discovery of :

    • (A) electron
    • (B) proton
    • (C) neutron
    • (D) None of these

Answer: (C) neutron 

23. The half life of a radioactive decay is n times its mean life, n is equal to : 

    • (A) 0.6930
    • (B) 0.0693
    • (C) 1 / 0.6930
    • (D) 0.3070

Answer: (A) 0.6930 

24. Rutherford is the unit of: 

    • (A) radioactivity
    • (B) energy
    • (C) photoelectric current
    • (D) magnetic field

Answer: (A) radioactivity

25. The wavelength of Y -rays is of the order of: 

    • (A) 10-8 m
    • (B) 10-5 me
    • (C) 10-11 m
    • (D) 10-22 m

Answer: (C) 10-11 m 

26. Which series of hydrogen spectrum does not lie in infrared region? 

    • (A) Humphreys series
    • (B) Pfund series
    • (C) Bracket series
    • (D) Lyman series

Answer: (D) Lyman series

27. The energy of electron in first Bohr orbit of hydrogen atom is -13.6 eV. What is energy of electron in its 2nd Both-orbit. 

    • (A) – 3.4 eV
    • (B) – 6.8 eV
    • (C) – 27.2 eV,
    • (D) + 3.4 eV

Answer: (A) – 3.4 eV 

28. Full wave rectifier uses : 

    • (A) two diodes
    • (B) three diodes
    • (C) four diodes
    • (D) five diodes

Answer: (A) two diodes 

29. The atomic number and mass number for a specimen are Z and A respectively. The number of neutrons in the atom will be : 

    • (A) A
    • (B) Z
    • (C) A + Z
    • (D) A-Z

Answer: (D) A-Z 

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03 Biology
04 Math
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