Q.1
) The ratio of atomic volume of nucleas to volume is of the order of
  • a)10-15
  • b) 10-10
  • c)1015
  • d)1010
Q.2
) Nucleon is common name for
  • a) electron and neutron
  • b) Proton and neutron
  • c) neutron and Positron
  • d)neufrom and neurtino
Q.3
) The nucler 7 N 14 and 6 C 13 can be desribed as
  • a)Isotones
  • b)Isobars
  • c)Isotope
  • d)Isomer
Q.4
) Plutonium decays with half life time 24000 yrs. if Plutonium is stored after 72000 yrs,the fraction of it that remain
  • a) 1/2
  • b) 1/9
  • c) 1/12
  • d) 1/8
Q.5
) The ratio of minimum to maximum wave length in Balmer series is
  • a)1 / 4
  • b) 5 / 36
  • c)3 / 4
  • d)5 / 9
Q.6
) If the binding energy of electron in a hydrogen atom is 13.6 eV , the energy required to remove the electron from the second excited state of Li ++ is
  • a) 13.6 eV
  • b) 3.4 eV
  • c)30.6 eV
  • d)122.4 eV
Q.7
) A radioactive substance decays to(1 /16) th of its initial activity in 40 days. the half life of the radioactive substance expressed in day is
  • a)20
  • b) 5
  • c)10
  • d)4
Q.8
) A complete the reaction
ch-19_que_no-168_img_no1.png
  • a) 36 Kr 90
  • b) 36 Kr 89
  • c) 36 Kr 91
  • d) 36 Kr 92
Q.9
) 6 C12 absorbs an energetic neutron and emits a β Partical. The resulting nucleus is
  • a)7 N13
  • b)7 N14
  • c)6 N 13
  • d)6 C12
Q.10
) Two deutrons each of mass m fuse to form helium resulting in release of energy E the mass of helium formed is
  • b) E / mc2
  • a) m + E /c²
  • c)2m - E / c²
  • d)2m + E / c²
Q.11
) what Percent of original radio active substans is left after 5 half life time
  • a) 3 %
  • b) 5%
  • c)6%
  • d)12%
Q.12
) In which region of eletromagnetic spectum does the Lyman series of hydrogen atom like
  • a) x-ray
  • b) Intrared
  • c) visible
  • d) ultraviolet
Q.13
) In terms of Rydergi constent R. The wave number of first Balmer line is
  • a)5R / 36
  • b) 8R / 9
  • c) R
  • d)8R / 20
Q.14
) The hydrogen atom can give spectral lines in the series Lyman, Balmer and Paschen. which of the following statement is correct
  • a) Lyman series is in the intrared region
  • b) Balmer series is in the ultravioet region
  • c)Balmer series is in the visible region
  • d)Paschen series is in the visible region
Q.15
) The ionization energy of hydrogen atom is 13.6 eV. The ionization energy of helium atom would be
  • a) 27.2 eV
  • b) 13.6 eV
  • c)54.4 eV
  • d)6.8 eV
Q.16
) A gamma ray photon creates an electon- Positon Pair. If the rest mass energy of an electron is 0.5 MeV. and the total kinetrc energy 0.7 MeV, then the energy of the gamma ray Photon must be
  • a) 3.9 MeV
  • b) 1.78 MeV
  • c) 0.78 MeV
  • d) 0.16 MeV
Q.17
) The masses of netron and Proton are 1.0087 amu and 1.0073 amu respectively. It the neutron and Protons combins to form binding energy of the helium nucleus will be (Mass of Helium = 4.0015amu
  • a)14.2 MeV
  • b) 28.4 MeV
  • c)27.3 MeV
  • d)20.8 MeV
Q.18
) Large angle scattering of α - particle could not be explained by
  • a) Thomson modal
  • b) Ruther Rutherford and Thpmoson modal
  • c)Both rutherford and Thomoson modal
  • d) Neither Ruthorford modal nor Thomson modal
Q.19
) The energy of an elecorn in nth orbit of hydrogen is 13.6 /n 2 eV. Energy required to exite the electron form the first orbit 4th orbit is
  • a)13.6
  • b) 3.4 eV
  • c)0.85 eV
  • d)1.5 eV
Q.20
) The activity of a radioactive sample is measured as no conuts per minute at t=o and No counts per minute t=5 min. The time (in min) at which activity reduces to half its value is
  • a) log e(2/5)
  • b) 5 log 10 2
  • c) 5 log e 2
  • d) log 10 (2/5)
Q.21
) A heavy nuecleus at least breaks into two frigments which fly off with velocities in the ratio 8:1 The ratio of radil of the frigments is
  • a)1 : 2
  • b) 4 : 1
  • c)1 : 4
  • d)2 : 1
Q.22
) The binding energy Per nucleon of 8 O 16 is 7.97 MeV and that of 8 O 17 is 7.75 MeV The energy (in-MeV) required to remove a neutrom from 8 O 17 is
  • a) 3.65
  • b) 7.86
  • c)3.52
  • d)4.23
Q.23
) The shape of the graph lnI → t is
  • a)stright Line
  • b)Parabolic curve
  • c) Hyberbole curve
  • d) random shape curve
Q.24
) The Probability of survival of a radioactive nucleus for one mean life time is
  • a) 1 - 1 /e
  • b) 1 /e
  • c) 2 / e
  • d) 3 / e
Q.25
) As the electron in Bohr is orbit of hydrogen atom passes from state n=2 to n=1, the K.E. and Potential energy changes as
  • a)Two fold , also two fold
  • b) four fold , two fold
  • c)four fold , also four fold
  • d) two fold , four fold
Q.26
)The wave lenght of the first line of Lyman series for hydrogen atom is equal to that of hydrogen atom is equal to that of second line of Balmar series for a hydrogen like ion. The atomic number Z of hydrogen like ion is
  • a) 1
  • b) 2
  • c)3
  • d)4
Q.27
) the nuclear decay below z X A → z+1 Y A → z-1 B A-4 → z-1 B A-4
  • a)β , α γ
  • b)α,β , γ
  • c)γ , β , α
  • d)β , γ α
Q.28
) A nucleus n X m emmits one α -particle and two β particle. The resulting nucleus is
  • a) n-2 Y m-4
  • b) n Y m-6
  • c) n Y m-4
  • d) n-4 Y m-6
Q.29
) At a certain time, a radio active sample contains 2× 1020 atoms and disintegration rate is 3× 1010 atom per sec. when 2 × 1015 atoms are Left to decay its disintegationrate will be
  • a)3 × 105atoms / s
  • b) 3 × 1010 atoms / s
  • c)6.6 × 101atoms / s
  • d)2 × 102 atoms / s
Q.30
) The radius of Ge nuclide is measured to be twice the radius of 4 Be 9 The number of nucleons in Ge are
  • a) 72
  • b) 78
  • c)65
  • d)80
0 h : 0 m : 1 s