NEET-UG SERIES Physics
Atoms
40 previous year questions.
Volume: 40 Ques
Yield: High
High-Yield Trend
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2005 3
2003 Chapter Questions 40 MCQs
01
PYQ 1989
easy
physics ID: neet-ug-
The atomic number of silicon is 14. Its ground state electron configuration is
1
2
3
4
02
PYQ 1989
medium
physics ID: neet-ug-
Curie is a unit of
1
energy of gamma rays
2
half-life
3
radioactivity
4
intensity of gamma rays
03
PYQ 1991
medium
physics ID: neet-ug-
In the nucleus of , the number of protons, neutrons and electrons are
1
11,12,0
2
23,12,11
3
12,11,0
4
23,11,12
04
PYQ 1992
medium
physics ID: neet-ug-
In terms of Bohr radius a0, the radius of the second Bohr orbit of a hydrogen atom is given by
1
2
3
4
05
PYQ 1993
easy
physics ID: neet-ug-
Energy released in the fission of a single nucleus is 200 MeV. The fission rate of filled reactor operating at a power level of 5 W is
1
2
3
4
06
PYQ 1993
medium
physics ID: neet-ug-
Which source is associated with a line emission spectrum?
1
Electric fire
2
Neon street sign
3
Red traffic light
4
Sun
07
PYQ 1997
medium
physics ID: neet-ug-
When hydrogen atom is in its first excited level, its radius, is
1
twice
2
half
3
same
4
four times
08
PYQ 1997
medium
physics ID: neet-ug-
Due to earth's magnetic field, the charged cosmic rays particles
1
can never reach the pole
2
can never reach the equator
3
require greater kinetic energy to reach the equator than pole
4
require less kinetic energy to reach the equator than pole.
09
PYQ 1998
medium
physics ID: neet-ug-
Complete the equation for the following fission process
1
2
3
4
10
PYQ 2000
medium
physics ID: neet-ug-
For the given reaction, the particle is:
1
Neutron
2
Anti neutrino
3
Neutrino
4
Proton
11
PYQ 2000
medium
physics ID: neet-ug-
When an electron does transition from to , then emitted line spectrum will be
1
first line of Lyman series
2
second line of Balmer series
3
first line of Paschen series
4
second line of Paschen series.
12
PYQ 2001
hard
physics ID: neet-ug-
If the energy of a hydrogen atom in nth orbit is , then energy in the nth orbit of a singly ionized helium atom will be
1
2
3
4
13
PYQ 2001
medium
physics ID: neet-ug-
Energy is released in nuclear fission is due to
1
Few mass is converted into energy
2
total binding energy of fragments is more than the binding energy of parental element
3
total binding energy of fragments is less than the binding energy of parental element
4
total binding energy of fragments is equal to the binding energy of parental element.
14
PYQ 2003
medium
physics ID: neet-ug-
J.J. Thomson's cathode-ray tube experiment demonstrated that
1
cathode rays are streams of negatively charged ions
2
all the mass of an atom is essentially in the nucleus
3
the of electrons is much greater than the of protons
4
the ratio of the cathode ray particles changes when a different gas is placed in the discharge tube
15
PYQ 2003
easy
physics ID: neet-ug-
The volume occupied by an atom is greater than the volume of the nucleus by a factor of about
1
2
3
4
16
PYQ 2003
hard
physics ID: neet-ug-
A sample of radioactive element has a mass of at an instant The approximate mass of this element in the sample after two mean lives is
1
1.35 g
2
2.50 g
3
3.70 g
4
6.30 g
17
PYQ 2005
medium
physics ID: neet-ug-
In any fission process the ratio
1
equal to 1
2
greater than 1
3
less than 1
4
depends on the mass of the parent nucleus.
18
PYQ 2005
medium
physics ID: neet-ug-
The total energy of an electron in the first excited state of hydrogen is about -3.4eV. Its kinetic energy in this state is:
1
- 3.4 eV
2
- 1.7 eV
3
1.7 eV
4
3.4 eV
19
PYQ 2005
medium
physics ID: neet-ug-
Energy levels A,B and C of a certain atom correspond to increasing values of energy i.e., EABC. If and are wavelengths of radiations corresponding to transitions C to B,B to A and C to A respectively, which of the following relations is correct ?
1
=
2
=
3
= 0
4
=
20
PYQ 2006
medium
physics ID: neet-ug-
In a discharge tube ionization of enclosed gas is produced due to collisions between :
1
positive ions and neutral atoms / molecules
2
negative electrons and neutral atoms / molecules
3
photons and neutral atoms / molecules
4
neutral gas atoms / molecules
21
PYQ 2006
medium
physics ID: neet-ug-
Ionization potential of hydrogen atom is 13.6 eV. Hydrogen atoms in the ground state are excited by monochromatic radiation of photon energy 12.1 eV. According to Bohr's theory, the spectral lines emitted by hydrogen will be :
1
two
2
three
3
four
4
one
22
PYQ 2008
easy
physics ID: neet-ug-
The ground state energy of hydrogen atom is -13.6 eV. When its electron is in the first excited state, its excitation energy is
1
10.2eV
2
0
3
3.4eV
4
6.8eV
23
PYQ 2009
easy
physics ID: neet-ug-
In a Rutherford scattering experiment when a projectile of charge and mass approaches a target nucleus of charge and mass , the distance of closest approach is . The energy of the projectile is :
1
Directly proportional to
2
Inversely proportional to
3
Directly proportional to mass
4
Directly proportional to
24
PYQ 2009
medium
physics ID: neet-ug-
In the nuclear decay given below the particles emitted in the sequence are
1
2
3
4
25
PYQ 2011
medium
physics ID: neet-ug-
An electron in the hydrogen atom jumps from excited state n to the ground state. The wavelength so emitted illuminates a photosensitive material having work function . If the stopping potential of the photoelectron is , then the value of is
1
2
2
3
3
4
4
5
26
PYQ 2012
medium
physics ID: neet-ug-
An electron of a stationary hydrogen atom passes from the fifth energy level to the ground level. The velocity that the atom acquired as a result of photon emission will be ( is the mass of the electron, , Rydberg constant and Planck's constant)
1
2
3
4
27
PYQ 2012
hard
physics ID: neet-ug-
Electron in hydrogen atom first jumps from third excited state to second excited state and then from second excited to the first excited state.
The ratio of the wavelengths emitted in the two cases is:
The ratio of the wavelengths emitted in the two cases is:
1
2
3
4
28
PYQ 2014
medium
physics ID: neet-ug-
Hydrogen atom in ground state is excited by a monochromatic radiation of = 975 . Number of spectral lines in the resulting spectrum emitted will be
1
3
2
2
3
6
4
10
29
PYQ 2015
medium
physics ID: neet-ug-
Consider orbit of (Helium), using non-relativistic approach, the speed of electron in this orbit will be [given constant, Z = 2 and h (Planck's Constant) = ]
1
0.73 m/s
2
3.0 m/s
3
2.92 m/s
4
1.46 m/s
30
PYQ 2015
medium
physics ID: neet-ug-
The number of d-electrons in is not equal to the number of electrons in which one of the following?
1
d-electrons in Fe (Z=26)
2
p-electrons in Ne (Z=10)
3
s-electrons in Mg (Z=12)
4
p-electrons in Cl (Z=17)
31
PYQ 2015
medium
physics ID: neet-ug-
In the spectrum of hydrogen, the ratio of the longest wavelength in the Lyman series to the longest wavelength in the Balmer series is
1
2
3
4
32
PYQ 2016
medium
physics ID: neet-ug-
Given the value of Rydberg constant is , the wave number of the last line of the Balmer series in hydrogen spectrum will be :
1
2
3
4
33
PYQ 2019
medium
physics ID: neet-ug-
-particle consists of:
1
2electrons and 4 protons only
2
2 protons only
3
2 protons and 2 neutrons only
4
2 electrons, 2 protons and 2 neutrons
34
PYQ 2019
medium
physics ID: neet-ug-
The total energy of an electron in an atom in an orbit is . Its kinetic and potential energies arc, respectively:
1
3.4 eV, -6.8 eV
2
3.4 eV. 3.4 eV
3
-3.4 eV, - 3.4 eV
4
-3.4 eV, -6.8 eV
35
PYQ 2020
medium
physics ID: neet-ug-
The total energy of an electron in the stationary orbit of the hydrogen atom can be obtained by
1
2
3
4
36
PYQ 2020
medium
physics ID: neet-ug-
For which one of the following, Bohr model is not valid?
1
Hydrogen atom
2
Singly ionised helium atom
3
Deuteron atom
4
Singly ionised neon atom
37
PYQ 2021
easy
physics ID: neet-ug-
Polar molecules are the molecules:
1
having zero dipole moment
2
acquire a dipole moment only in the presence of electric field due to displacement of charges
3
acquire a dipole moment only when magnetic field is absent
4
having a permanent electric dipole moment
38
PYQ 2021
medium
physics ID: neet-ug-
Polar molecules are the molecules :
1
having a permanent electric dipole moment
2
having zero dipole moment
3
acquire a dipole moment only in the presence of electric field due to displacement of charges
4
acquire a dipole moment only when magnetic field is absent
39
PYQ 2023
easy
physics ID: neet-ug-
The radius of innermost orbit of a hydrogen atom is 5.3x10-11 m. What is the radius of the third allowed orbit of the hydrogen atom?
1
1.06Å
2
1.59Å
3
4.77Å
4
0.53Å
40
PYQ 2024
medium
physics ID: neet-ug-
The spectral series which corresponds to the electronic transition from the levels n2 = 5, 6,… to the level n1 = 4 is
1
Pfund series
2
Brackett series
3
Lyman series
4
Balmer series
About Atoms - NEET-UG
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