NEET UG Physics Atom and Nucleus MCQs

(ii) statement-I 1 amu=931.48 MeV
     statement-II It follows form E=mc2

(iii) statement -I:-half life time of tritium is 12.5 years
      statement-II :- The fraction of tritium that remains after 50 years is 6.25%

(iv) statement-I:- Nuclei of different atoms have same size
      state ment-I I :- R=Ro(A)^1/3

(45) 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

(46) 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 thean x
(B) x will decay faster then 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.

(47) 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

(48) 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°

(84) The ionigation energy of hydrogen atom is 13.6 eV. The ionigation energy of helium atom would be
(A) 27.2 eV
(B) 13.6 eV
(C) 54.4 eV
(D) 6.8 eV

(85) 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

(86) The masses of netron and Proton are 1.0087 amu and 1.0073 amu respectively. It the neufron and Protons combins to form binding energy of the helium nucleus will be
(A) 14.2 MeV
(B) 28.4 MeV
(C) 27.3 MeV
(D) 20.8 MeV

(87) 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 norThomson modal