JEE PHYSICS UNIT 18
QUIZ NO 1
TOTAL QUESTIONS = 20
1. The energy of an electron in the nth orbit of a hydrogen atom is given by
A. E = -13.6/n^2 eV
B. E = 13.6/n^2 eV
C. E = -13.6n^2 eV
D. E = 13.6n^2 eV
2. The value of the ground state energy of hydrogen atom is
A. -13.6 eV
B. 13.6 eV
C. 0 eV
D. 1.6 eV
3. The radius of a hydrogen atom in the ground state is given by
A. 5.29 x 10^-11 m
B. 5.29 x 10^-10 m
C. 5.29 x 10^-12 m
D. 5.29 x 10^-13 m
4. The binding energy of a nucleus is
A. The energy required to break a nucleus into its constituent nucleons
B. The total energy of the nucleus
C. The energy of the proton
D. The energy of the neutron
5. The angular momentum of an electron in the Bohr model of the atom is quantized as
A. nh/2π
B. nh
C. h/n
D. n^2h
6. What is the primary reason for the emission of radiation in the Bohr model of the atom?
A. Electron transition between energy levels
B. Electron gaining energy
C. Electron remaining in a fixed orbit
D. Proton emission
7. The half-life of a radioactive substance is 10 years. After how much time, the substance decays to one-sixteenth of its initial quantity?
A. 40 years
B. 20 years
C. 30 years
D. 10 years
8. In the Bohr model of the hydrogen atom, the electron transitions from n=2 to n=1. The wavelength of the emitted radiation corresponds to
A. Lyman series
B. Balmer series
C. Paschen series
D. Brackett series
9. What is the energy of a photon in the visible region of the spectrum emitted by a hydrogen atom?
A. Depends on the transition between energy levels
B. Fixed value for all transitions
C. Depends on the temperature
D. Varies inversely with the wavelength
10. In a nuclear fission reaction, energy is released due to
A. Mass defect
B. Nuclear fusion
C. Neutron bombardment
D. Electron emission
11. The mass defect of a nucleus is the difference between
A. The mass of the nucleus and the sum of the masses of its constituent nucleons
B. The mass of the electron and the proton
C. The mass of the proton and the neutron
D. The mass of the nucleus and its electrons
12. The radius of a nucleus is proportional to
A. A^1/3
B. A^1/2
C. A
D. A^2
13. What happens when an electron in a hydrogen atom jumps from the higher orbit to a lower orbit?
A. Energy is emitted
B. Energy is absorbed
C. No energy is emitted
D. The electron is ejected from the atom
14. Which of the following phenomena occurs in both fission and fusion reactions?
A. Release of energy
B. Absorption of energy
C. No change in mass
D. Neutron capture
15. In an alpha decay, the emitted particle consists of
A. 2 protons and 2 neutrons
B. 1 proton and 1 neutron
C. 1 proton
D. 1 neutron
16. What is the maximum number of electrons that can occupy the n=4 energy level in a hydrogen atom?
A. 32
B. 8
C. 18
D. 2
17. The ionization energy of the hydrogen atom is equal to
A. 13.6 eV
B. 3.6 eV
C. 6.8 eV
D. 1.6 eV
18. The process of electron capture in a nucleus results in
A. The conversion of a proton into a neutron
B. The emission of a beta particle
C. The formation of an electron
D. The emission of an alpha particle
19. The radius of an atom is proportional to
A. Z^2
B. Z
C. 1/Z
D. 1/Z^2
20. The binding energy per nucleon is maximum for
A. Iron-56
B. Uranium-238
C. Oxygen-16
D. Hydrogen-1
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