Physics Rapid Revision questions for NEET Free download read online
1. For a hydrogen atom, in which of the following transitions will the wavelength
emitted photon be minimum :
(1) n = 5 to n = 4
(2) n = 4 to n = 3
(3) n = 3 to n = 2
(4) n = 2 to n = 1
2. In n the orbit number of the electron in a hydrogen atom, the correct
statement among the following is:
(1) Electron energy increases as n increses
(2) Hydrogen emits infrared rays for the electron transition from n = to
n = 1
(3) Electron energy is zero for n = 1
(4) Electron energy varies as n2
3. The ionization energy of the electron in the hydrogen atom in its ground
state is 13.6 eV. The atoms are excited to higher energy levels to emit
radiations of 6 wavelengths. Maximum wavelength of emitted radiation
corresponds to the transition between :
(1) n = 3 to n = 2 states
(2) n = 3 to n = 1 states
(3) n = 2 to n = 1 states
(4) n = 4 to n = 3 states
4. If a wrie is stretched to make it 0.1% longer, its resistance will :
(1) increase by 0.05%
(2) increase by 0.2%
(3) decrease by 0.2%
(4) decrease by 0.05%
5. Which of the following is true of the Balmer series of the hydrogen spectrum:
(1) The entire series falls in the ultraviolet region
(2) The entire series falls in the infrared region
(3) The series is partly in the visible region and partly in the ultraviolet
region
(4) The series is partily in the visible region and partly in the infrared region
6. The wavelength of the first line of Lyman series for hydrogen atom is equal
to that of the second line of Balmer series for a hydrogen like ion. The atomic
number Z of hydrogen like ion is :
(1) 2
(2) 3
(3) 4
(4) 1
7. What will be ratio of radii of Li7
nucleus for Fe56 nucleus :
(1) 1 : 3
(2) 1 : 2
(3) 1 : 8
(4) 2 : 6
8. As an electron makes a transition from an excited state to the ground state
of a hydrogen-like atom/ion :
(1) Its kinetic energy increases but potential energy and total enegy decrease
(2) Kinetic energy, potential energy and total energy decrease
(3) Kinetic energy decreases, potential energy increases bu total energy
remain same
(4) Kinetic energy and total energy decreases but potential energy
increases.
9. Excitation energy of a hydrogen like ion in its first excitation state is
40.8 eV. Energy needed to remove the electron from the ion in ground state
is :
(1) 54.4 eV
(2) 13.6 eV
(3) 40.8 eV
(4) 27.2 eV
10. A wire of length 5m and radius 1 mm has a resistance of 1 ohm. What length
of the wire of the same material at the same temperature and of radius
2 mm will also have a resistance of 1 ohm:
(1) 1.25 m
(2) 2.5 m
(3) 10 m
(4) 20 m.
