JEE Questions for Physics Atoms And Nuclei Quiz 4 - MCQExams.com


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  • Physics-Atoms and Nuclei-62514.png
  • 2)
    Physics-Atoms and Nuclei-62515.png

  • Physics-Atoms and Nuclei-62516.png
  • None of these
The transition from the state n = 4 to n = 3 in a hydrogen like atom results in ultraviolet radiation. Infrared radiation will be obtained in the transition from
  • 2 → 1
  • 3 → 2
  • 4 → 2
  • 5 → 3
For hydrogen atom electron in n th Bohr orbit, the ratio of radius of orbit to its de-Broglie wavelength is

  • Physics-Atoms and Nuclei-62517.png
  • 2)
    Physics-Atoms and Nuclei-62518.png

  • Physics-Atoms and Nuclei-62519.png

  • Physics-Atoms and Nuclei-62520.png
The shortest wavelength which can be obtained in hydrogen spectrum is (R = 107 m-1)
  • 100 Å
  • 800 Å
  • 1300 Å
  • 2100 Å
In a hydrogen atom, the electron is making 6.6 × 1015 rev s-1 around the nucleus in an orbit of radius 0.528 Å . The magnetic moment (A – m2) will be
  • 1 × 10-15 unit
  • 1 × 10-10 unit
  • 1 × 10-23 unit
  • 1 × 10-27 unit
Hydrogen atom from excited state comes to the ground state by emitting a photon of wavelength λ . If R is the Rydberg constant, the principal quantum number n of the excited state is

  • Physics-Atoms and Nuclei-62522.png
  • 2)
    Physics-Atoms and Nuclei-62523.png

  • Physics-Atoms and Nuclei-62524.png

  • Physics-Atoms and Nuclei-62525.png
In the Bohr's model of the hydrogen atom, the lowest orbit corresponds to
  • infinite energy
  • maximum energy
  • minimum energy
  • zero energy
In a hydrogen atom, the electron moves around the nucleus in a circular orbit of radius 5 ×10-11 m. Its time period is 1.5 × 10-16 s. The current associated with the electron motion (charge of electron is 1.6 × 10-19 C)
  • 1.00 A
  • 1.066 × 10-3 A
  • 1.81 × 10-3 A
  • 1.66 × 10-3 A
If the radii of nuclei of 13Al27 and 30Zn64 and R1 and R2 respectively, then R1/R2 is equal to
  • 27/64
  • 64/27
  • 4/3
  • 3/4
What is the difference of angular momenta of an electron in two consecutive orbits in hydrogen atom?
  • h/2
  • h/π
  • 2π/h
  • h/2π

Physics-Atoms and Nuclei-62527.png

  • Physics-Atoms and Nuclei-62528.png
  • 2)
    Physics-Atoms and Nuclei-62529.png

  • Physics-Atoms and Nuclei-62530.png

  • Physics-Atoms and Nuclei-62531.png
The ratio of minimum wave lengths of Lyman and Balmer series will be
  • 1.25
  • 0.25
  • 5
  • 10
The ionisation potential of hydrogen atom is 13.6 eV. The energy required to remove an electron from the second orbit of hydrogen will be
  • 27.4 eV
  • 13.6 eV
  • 3.4 eV
  • None of these
The angular momentum (L) of an electron moving in a stable orbit around nucleus is
  • half integral multiple of h/2π
  • integral multiple of h
  • integral multiple of h/2π
  • half integral multiple of h
If λ1 and λ2 are the wave lengths of the first members of the Lyman and Paschen series respectively, then λ1 : λ2 is
  • 1 : 3
  • 1 : 30
  • 7 : 50
  • 7 : 108
The largest wavelength in the ultraviolet region of the hydrogen spectrum is 122 nm. The smallest wavelength in the infrared region of the hydrogen spectrum (to the nearest integer) is
  • 802 nm
  • 823 nm
  • 1882 nm
  • 1648 nm
The diagram shows the energy levels for an electron in a certain atom, which transition shown represents the emission of a photon with the most energy?
Physics-Atoms and Nuclei-62534.png
  • III
  • IV
  • I
  • II
The ionisation energy of Li2+ is equal to
  • 9hcR
  • 6hcR
  • 2hcR
  • hcR
In Raman effect, Stokes's lines are spectral lines having
  • frequency greater than that of the original line
  • wavelength equal to that of the original line
  • wavelength less than that of the original line
  • wavelength greater than that of the original line
If a is radius of first Bohr orbit in hydrogen atom, the radius of the third orbit is
  • 3a
  • 9a
  • 27a
  • 81a
If λ is the wavelength of hydrogen atom from the transition n = 3 to n = 1, then what is the wavelength for doubly ionised lithium ion for same transition?
  • λ/3
  • 3λ
  • λ/9
  • 9λ
Wavelength of light emitted from second orbit to first orbit in a hydrogen atom is
  • 6563 Å
  • 4102 Å
  • 4861 Å
  • 1215 Å
The shortest wavelength in Lyman series is 91.2 nm. The longest wavelength of the series is
  • 121.6 nm
  • 182.4 nm
  • 243.4 nm
  • 364.8 nm
A photon collides with a stationary hydrogen atom in ground state inelastically. Energy of the colliding photon is 10.2 eV. After a time interval of the order of micro second another photon collides with same hydrogen atom inelastically with an energy of 15 eV. What will be observed by the detector?
  • 2 photon of energy 10.2 eV
  • 2 photon of energy of 1.4 eV
  • One photon of energy 10.2 eV and an electron of energy 1.4 eV
  • One photon of energy 10.2 eV and another photon of energy 1.4 eV
Let binding energy per nucleon of nucleus is denoted as Ebm and radius of nucleus is denoted as r. If mass number of nuclei A and B are 64 and 125 respectively, then

  • Physics-Atoms and Nuclei-62536.png
  • 2)
    Physics-Atoms and Nuclei-62537.png

  • Physics-Atoms and Nuclei-62538.png

  • Physics-Atoms and Nuclei-62539.png

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  • Physics-Atoms and Nuclei-62542.png
  • 2)
    Physics-Atoms and Nuclei-62543.png

  • Physics-Atoms and Nuclei-62544.png

  • Physics-Atoms and Nuclei-62545.png

Physics-Atoms and Nuclei-62546.png
  • 5316 ReV
  • 5422 ReV
  • 5707 ReV
  • 5818 ReV

Physics-Atoms and Nuclei-62548.png
  • IV
  • III
  • I
  • II
Two elements A and B with atomic numbers ZA and ZB are used to produce characteristic, X-rays, with frequencies vA and vB respectively. If ZA : ZB = 1 : 2 , then vA : vB will be
  • 1 : √2
  • 1 : 8
  • 4 ; 1
  • 1 : 4
Statement I A nucleus having energy E1 decays be emission to daughter nucleus having energy E2. but. the rays arc emitted with a continuous energy spectrum having end point energy E1 - E2. Statement II To conserve energy and momentum in β- decay at least three particles must take part in the transformation.
  • Statement I is correct. Statement II is incorrect
  • Statement I is incorrect. Statement II is correct
  • Statement I is incorrect. Statement II is incorrect, Statement II is the correct explanation of Statement I
  • Statement I is correct, Statement II is incorrect. Statement II is not the correct explanation of Statement I
After absorbing a slowly moving neutron of mass mN (momentum ~a nucleus of mass Al breaks into two nuclei of masses m1 and 5m1 (6m1 =M + mN respectiveiy. If the de-Broglie wavelength of the nucleus with mass m1 is λ . then the de-Broglie wavelength of the other nucleus will be
  • 25λ
  • 5λ
  • λ/5
  • λ
If the binding energy per nucleon of deutron is 1.115 MeV, its mass defect in atomic mass unit is
  • 0.0048
  • 0.0024
  • 0.0012
  • 0.0006
  • 2.230

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  • Physics-Atoms and Nuclei-62553.png
  • 2)
    Physics-Atoms and Nuclei-62554.png

  • Physics-Atoms and Nuclei-62555.png

  • Physics-Atoms and Nuclei-62556.png
The above is a plot of binding energy per nucleon Eh, against the nuclear mass M.A.B,C,D,E and F correspond to different nuclei. Consider and four reactions
I. A + B → C + ε
II. C → A + B + ε
III. D + E → F + ε
IV. F → D + E + ε
Physics-Atoms and Nuclei-62557.png
  • I and IV
  • I and III
  • II and IV
  • II and III
Atomic weight of boron is 10.81 and it has two isotopes 5B10 and 5B11. Then, ratio of 5B10 : 5B11 in nature would be
  • 19 : 81
  • 10 : 11
  • 15 : 16
  • 81 : 19
Two lithium nuclei in a lithium vapour at room temperature do not combine to form a carbon nucleus because
  • carbon nucleus is an unstable particle
  • it is not energetically favourable
  • nuclei do not come very close due to Coulombic repulsion
  • lithium nucleus is more tightly bound than a carbon nucleus
Fpp, Fnn and Fnp are the nuclear forces between proton - proton, neutron - neutron and neutron - proton respectively. Then, relation between them is
  • Fpp = Fnn ≠ Fnp
  • Fpp ≠ Fnn = Fnp
  • Fpp = Fnn = Fnp
  • Fpp ≠ Fnn ≠ Fnp
If Mo is the mass of an oxygen isotope BO17, MP and Mn are the masses of a proton and a neutron respectively, the nuclear binding energy of the isotope is
  • (mo – 8mp)C2
  • (mo – 8mp – 9mn)C2
  • moC2
  • (mo – 17mn)C2
What will be ratio of radii of Li7 nucleus to Fe56 nucleus?
  • 1 : 3
  • 1 : 2
  • 1 : 8
  • 2 : 6
The ratio of the nuclear radii of elements with mass numbers 216 and 125 is
  • 216, 125
  • √216, √125
  • 6 : 5
  • None of these
The nuclear radius of a certain nucleus is 7.2 Fm and it has charge of 1.28 × 10-7 C. The number of neutrons inside the nucleus is
  • 136
  • 142
  • 140
  • 132
  • 126

Physics-Atoms and Nuclei-62561.png
  • O2
  • N2
  • He
  • Ar
The nucleus 6C12 absorbs an energetic neutron and emits a β - particle. The resulting nucleus is
  • 7N14
  • 7N13
  • 5B13
  • 6C13
Select the true statement from the following. Nuclear force is
  • strong, short range and charge independent force
  • charge independent, attractive and long range force
  • strong, charge dependent and short range attractive force
  • long range, charge dependent and attractive force

Physics-Atoms and Nuclei-62563.png

  • Physics-Atoms and Nuclei-62564.png
  • 2)
    Physics-Atoms and Nuclei-62565.png

  • Physics-Atoms and Nuclei-62566.png

  • Physics-Atoms and Nuclei-62567.png
If r1 and r2, are the radii of the atomic nuclei of mass numbers 64 and 125 respectively, then the ratio (r1 /r2 ) is
  • 64/125
  • 2)
    Physics-Atoms and Nuclei-62568.png
  • 5/4
  • 4/5
In the options given below, let E denotes the rest mass energy of a nucleus and n a neutron. The correct option is

  • Physics-Atoms and Nuclei-62570.png
  • 2)
    Physics-Atoms and Nuclei-62571.png

  • Physics-Atoms and Nuclei-62572.png

  • Physics-Atoms and Nuclei-62573.png
In γ - rays emission from a nucleus
  • both the neutron number and the proton number change
  • there is no change in the proton number and the neutron number
  • only the neutron number changes
  • only the proton number changes
The volume of a nucleus is directly proportional to
  • A
  • A3
  • √A
  • A1/3
Li nucleus has three protons and four neutrons. Mass of lithium nucleus is 7.016005 amu. Mass of proton is 1.007277 amu and mass of neutron is 1.008665 amu. Mass defect for lithium nucleus in amu is
  • 0.04048 amu
  • 0.04050 amu
  • 0.04052 amu
  • 0.04055 amu
0:0:1


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