Q.1
9) which of the following can not be emitted in radioactive decay of the substance?
  • a) Helium-nucleus
  • b) Electrons
  • c)Neutrions
  • d)Proton.
Q.2
0) If the radius of 27 13 Al nucleus is 3.6 fm the radius of 125 52 Te nucleus is nearly equal to
  • a) 8 fm
  • b) 6 fm
  • c) 4 fm
  • d) 5 fm
Q.3
) which of the following atom has the lowest ionization potentical?
  • a) 147 N
  • b) 4018 Ar
  • c)13355 Cs
  • d)168 O
Q.4
) If the binding energy of electron in a hydrogen atom is 13.6 eV, the energy required to remove the elecron form the first state of Li2+ is.
  • a) 13.6 eV
  • b) 30.6 eV
  • c) 122.4 eV
  • d)3.4 eV
Q.5
) The ionigation Potential of hydrogen atom is 13.6 eV. An electron in the ground state absords Photon of energy 12.75 eV. How many dirrerent spectral lines can one expect when electron make a down ward transition
  • a) 1
  • b)2
  • c)6
  • d)4
Q.6
) A radio-active nucleus A Z X emits 3α -particles and 2 Positrions. the ratio of number of neuleuons to that of Protons in the final nucleus will be
  • a)( A - Z - 8 ) / Z - 4
  • b) ( A + Z - 12 ) / Z - 4
  • c) (A - Z - 4 ) / Z - 8
  • d) ( A - Z - 4 ) / Z - 2
Q.7
) An α-particle of energy ½ mv2 bombards by a heavy nuclear target of charge .Thenthe distance of closest approach for the alpha nucleus will be Proportional to
  • a)1/Z3
  • b) 1/ v4
  • c)1 / m
  • d)1 / v2
Q.8
6) when 73 Li nucler are bombarded by Proton and the resultant nuclei are 84 Be, then emitted particle will be
  • a) neutron
  • b) gamma
  • c) alpha
  • d)Beta
Q.9
) starting with a sample of Puer cu-66, 7/8 of its decays into Zn in 15 min. The corresponding half-life is
  • a)5 min
  • b)7.5 min
  • c)10 min
  • d) 15 min
Q.10
) An α -particle of energy 5 MeV is scattered though 180 by a fixed uranium nucleus. The distance of the closest approach nucleus The distance of the closest approach is of the order of
  • a) 10-8 cm
  • b) 10-12 cm
  • c) 10-10 cm
  • d) 10-15 cm
Q.11
The binding energy Per nucleon of deutron (2 1H) and Lielium nucleus (4 2He ) 1.1 MeV and 7.0 MeV.respectively. If two beutron nucler react to form a singlehelium nucleus, the energy released is
  • a) 23.6 MeV
  • b) 26.9 MeV
  • c)13.9 MeV
  • d)19.2 MeV
Q.12
) The nucleus at rest disintegrate into two nuclear parts which have their velocities in the ratio 2:1 The ratio of their nuclar sizes will be
  • a) 3√2 :1
  • b) 1 : 3 √2
  • c) 3 : 1
  • d)1 : 3
Q.13
) A radiation of energy E falls normally on a Pertect reflecting surface. The momentum transferred to the surtace is.
  • a) E / c
  • b) 2E / c
  • c)E / c2
  • d)Ec
Q.14
) In the following nuclear fusion reaction the repalsive potential energy between the two fusing nucler is 7.7× 10-14 J The Temperature to which the gas must be heated is nearly (Boltzman constmt K=1.38 × 10 -23 J / K )
ch-19_que_no-132_img_no1.png
  • a) 103K
  • b) 105K
  • c) 107K
  • d) 109K
Q.15
) If the binding energy Per nucleon in 73 Li and 42 He nucler is 5.6 MeV and 7.06 MeV respectively, then in the reaction (P here retrent Proton)energy of Protpn must be
ch-19_que_no-133_img_no1.png
  • a) 1.46 MeV
  • b) 39.2 MeV
  • c) 17.28 MeV
  • d)17.28 MeV
Q.16
) In gamma ray emission form a nucleus
  • a) there is no change in the proton-number and neutron number
  • b) Both the number are changes
  • c)only Proton number change
  • d)only neutron number change
Q.17
) The half life time of a radidactive elements of x is the same as the mean life of another radioactive element Y. Initially they have same number of atoms, then
  • a) y will decay faster than x
  • b) x will decay faster than y
  • c) x and y will decay at the same rate at all time
  • d)x and y will decay at the same rate intially
Q.18
) which of the following transition in hydrogen atoms emits Photon of highest frequengy?
  • a) n=2 to n=6
  • b) n=1 to n=2
  • c) n=2 to n=1
  • d) n=6 to n=2
Q.19
) An electron Passing through a Potential diffencne of 4.9 v colides with a mercury atom and trnasfer it to the first excited state what is trnasfer it to the first excited state. what is the wave length of Photon corresponding to the franition of mercury atom to its normal state.
  • a) 2050A
  • b) 2935A
  • c)2525A
  • d)2240A
Q.20
) The binding energy per nucleon for the Parent nucleus is E1 and that for the daughter nuclei is E 2 then
  • a) E 1 < E 2
  • b) E 1 > E 2
  • c) E 1=E 2
  • d) E 1=2 E 2
Q.21
) Light form the discharge tube containing hydrogen atom falls on the surface of a Piece of sodium. The kinetic energy of the fastest photo electrons emitted form sodium is 0.73 eV. The work function for sodium is 1.82 eV. Ionigation Potential of hydrogen is 13.6 v and the mass of hydrogen atom is 1.67× 10-27 kg. The energy of Photon causing the Photo electeic emission is
  • a) 4.08 × 10-19 J
  • b) 2.912 × 10-19
  • c)1.744 × 10-19
  • d)1.168 × 10-19
Q.22
) Light form the discharge tube containing hydrogen atom falls on the surface of a Piece of sodium. The kinetic energy of the fastest photo electrons emitted form sodium is 0.73 eV. The work function for sodium is 1.82 eV. Ionization Potential of hydrogen is 13.6 v and the mass of hydrogen atom is 1.67 × 10-27 kg. The quantum number of the two levels in the emission
  • a) n=1 , n=3
  • b) n=2 , n=4
  • c) n=1 , n=4
  • d) n=3 , n=4
Q.23
) Light form the discharge tube containing hydrogen atom falls on the surface of a Piece of sodium. The kinetic energy of the fastest photo electrons emitted form sodium is 0.73 eV. The work function for sodium is 1.82 eV. Ionigation Potential of hydrogen is 13.6 v and the mass of hydrogen atom is 1.67 × 10-27 kg. In this transition change in the angular momentum of electron is (where h isPlank constanst )
  • a)h / 2π
  • b) h / π
  • c)2h / π
  • d)3h / 2π
Q.24
)Light form the discharge tube containing hydrogen atom falls on the surface of a Piece of sodium. The kinetic energy of the fastest photo electrons emitted form sodium is 0.73 eV. The work function for sodium is 1.82 eV. Ionigation Potential of hydrogen is 13.6 v and the mass of hydrogen atom is 1.67 × 10-27 kg. The recoil speed of emitting atom caussing that is at lest before the transitionis of the order of
  • a) 1 cm /s
  • b) 102 m / s
  • c)104 m / s
  • d)1 m /s
Q.25
) A and B are two radioactive substane whose half lives are 1 and 2 years respectively. Initially 10 g of A and 1 g of B is taken. The time after which they will have same quantity remaining is
  • a) 3.6 years
  • b) 7 years
  • c)6.6 years
  • d)5 years
Q.26
) which of these is a fusion reuction
  • a) 31H + 21H=42 + 10n
  • b) 127C → 126 C + β + + γ
  • c) 23892 → 29882 Pb + 8( 42He) + 6( 10e)
  • d) none of these
Q.27
) The activity of a sample of a radio- active material is at time t1 and A2 at time t 2 (where t2 > t1) if T its mean life is then
  • a)A1t1 A2t2
    ch-19_qn-145choice_img_no2.png
  • b)
  • c)A2 - A1=t2 - t1
  • d)A2=A1 e(t2 / t1)T
Q.28
6) The energy released by the fission of one unanium atom is 200 MeV. The number of fission Per second required to Produce 3.2 w of Power is
  • a) 1010
  • b) 107
  • c) 1012
  • d) 1011
Q.29
) In the following disintegration series 92 U 238 → α→ X → -β → z Y A The value of Z and A respectively will be
  • a)90 , 234
  • b) 92 , 236
  • c)88 , 234
  • d)91 , 234
Q.30
) If 92 U 238 undergoes sucesively 8α decays and 6β decays then resulting nucleus is
  • a) Pb 206
  • b) Pb 208
  • c) Pb 214
  • d) None of these
0 h : 0 m : 1 s