As compared C12 atom, C14 atom has

(a) Two extra protons and two extra electrons
(b) Two extra protons but no extra electrons
(c) Two extra neutrons and no extra electrons
(d) Two extra neutrons and two extra electrons

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Mass-energy equivalent
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If m, mn and mp are the masses of XAZ nucleus, neutron and proton respectively 
(a) m<A-Zmn+Zmp        (b) m=A-Zmn+Zmp
(c) m=A-Zmp+Zmn        (d) m>A-Zmn+Zmp

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Mass-energy equivalent
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On the bombardment of neutron with Boron. α-particle is emitted and product nuclei formed is
(a) C126          (b) Li63
(c) Li73           (d) Be94

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The average kinetic energy of the thermal neutrons is of the order of 
(a) 0.03 eV         (b) 3 eV 
(c) 3 KeV            (d) 3 MeV

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Mass-energy equivalent
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Which of the following isotopes is normally fissionable ?

(a) U23892              (b) Np23993
(c) U23592              (d) He42

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The process by which a heavy nucleus splits into light nuclei is known as 
(a) Fission            (b) α-decay
(c) Fusion             (d) Chain reaction

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Mass-energy equivalent
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The explosion of the atomic bomb takes place due to

(a) Nuclear fission           (b) Nuclear fusion
(c) Scattering                 (d) Thermionic emission

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In nuclear reaction He42+XAZYA+3z+2+A, A denotes 
(a) Electron            (b) Positron
(c) Proton               (d) Neutron

Concept Questions :-

Types of decay
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Energy generation in stars is mainly due to

(a) Chemical reactions               (b) Fission of heavy nuclei
(c) Fusion of light nuclei             (d) Fusion of heavy nuclei

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Fusion reaction is initiated with the help of 
(a) Low temperature         (b) High temperature
(c) Neutrons                     (d) Any particle

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