Which of the following pairs is an isobar 
(a) H11 and H21                (b) H21 and H31
(c) C126 and C136              (d) P3015 and Si3014

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Mass-energy equivalent
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Equivalent energy of mass equal to 1 a.m.u. is

(a) 931 KeV                (b) 931 eV
(c) 931 MeV                (d) 9.31 MeV

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The binding energies per nucleon for a deuteron and an particle are x1 and x2 respectively. What will be the energy Q released in the reaction H21+H21He42+Q

(a) 4x1+x2             (b) 4x2-x1
(c) 2x1+x2             (d) 2x2-x1

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Nuclear binding energy
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The mass number of a nucleus is equal to the number of

(a) Electrons it contains           (b) Protons it contains
(c) Neutrons it contains           (d) Nucleons it contains

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The rest energy of an electron is

(a) 510 KeV            (b) 931 KeV
(c) 510 MeV            (d) 931 MeV

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In Ra22688 nucleus, there are 
(a) 138 protons and 88 neutrons
(b) 138 neutrons and 88 protons
(c) 226 protons and 88 electrons
(d) 226 neutrons and 138 electrons

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Outside a nucleus 
(a) Neutron is stable
(b) Proton and neutron both are stable
(c) Neutron is unstable
(d) Neither neutron nor proton is stable

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Order of magnitude of density of uranium nucleus is (mP=1.67×10-27 kg)
(a) 1020 kg/m3           (b) 1017 kg/m3
(c) 1014 kg/m3           (d) 1011 kg/m3

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Radius of He24 nucleus is 3 Fermi. The radius of Pb82206 nucleus will be 
(a) 5 Fermi                 (b) 6 Fermi
(c) 11.16 Fermi           (d) 8 Fermi

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Nucleus of an atom whose atomic mass is 24 consists of

(a) 11 electrons, 11 protons and 13 neutrons
(b) 11 electrons, 13 protons and 11 neutrons
(c) 11 protons and 13 neutrons
(d) 11 protons and 13 electrons

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