JEE PHYSICS UNIT 18
QUIZ NO 4
TOTAL QUESTIONS = 20
1. The energy of an electron in the nth orbit of the hydrogen atom is
A. -13.6/n^2 eV
B. 13.6/n^2 eV
C. 13.6n^2 eV
D. -13.6n^2 eV
2. The wavelength of radiation emitted during the transition of an electron from n=2 to n=1 in the hydrogen atom is
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series
3. The ionization energy of the hydrogen atom is
A. 13.6 eV
B. 6.8 eV
C. 3.6 eV
D. 1.6 eV
4. The Bohr model of the hydrogen atom was proposed by
A. Albert Einstein
B. Niels Bohr
C. Max Planck
D. Erwin Schrödinger
5. The ground state energy of a hydrogen atom is
A. -13.6 eV
B. 13.6 eV
C. 0 eV
D. 3.6 eV
6. The binding energy per nucleon is maximum for
A. Iron-56
B. Oxygen-16
C. Uranium-238
D. Hydrogen-1
7. The radius of an atom is proportional to
A. Z^2
B. Z
C. 1/Z
D. 1/Z^2
8. The concept of nuclear fusion was introduced by
A. Hans Bethe
B. Albert Einstein
C. Niels Bohr
D. Ernest Rutherford
9. The wavelength of the radiation emitted when an electron jumps from n=4 to n=3 is part of the
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series
10. The total energy of an electron in a hydrogen atom is
A. Negative and depends on n
B. Positive and depends on n
C. Zero
D. Negative and independent of n
11. In the Bohr model of the hydrogen atom, the angular momentum of an electron in the nth orbit is quantized as
A. nh/2π
B. h/n
C. n^2h
D. nh
12. The energy of the emitted photon in the hydrogen atom when the electron jumps from n=2 to n=1 is
A. 13.6 eV
B. 2.55 eV
C. 1.51 eV
D. 0.85 eV
13. The half-life of a radioactive substance is 10 years. After how much time will it decay to one-eighth of its initial quantity?
A. 30 years
B. 40 years
C. 50 years
D. 20 years
14. The radius of the nth orbit of an electron in a hydrogen atom is proportional to
A. n^2
B. n
C. 1/n
D. 1/n^2
15. In a nuclear fission reaction, the energy is released due to
A. Mass defect
B. Neutron bombardment
C. Nuclear fusion
D. Electron emission
16. The primary reason for the emission of radiation in the Bohr model is
A. Electron transition between energy levels
B. Electron moving in fixed orbits
C. Electron gaining energy
D. Electron emitting a photon
17. The ionization energy of hydrogen in its ground state is
A. 13.6 eV
B. 3.6 eV
C. 6.8 eV
D. 0 eV
18. In the Bohr model, the angular momentum of an electron in the nth orbit is quantized as
A. nh/2π
B. h/n
C. n^2h
D. n
19. The concept of nuclear fission is associated with the release of energy due to
A. Mass defect
B. Fusion of heavy nuclei
C. Alpha decay
D. Electron capture
20. The binding energy of a nucleus is the energy required to
A. Break a nucleus into its constituent nucleons
B. Increase the size of the nucleus
C. Break the nucleus into protons and neutrons
D. Ionize the atom
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