The mass density of a nucleus varies with mass number A as [1992]

(1) A2               (2) A              (3) Constant         (4) 1A

Concept Questions :-

Mass-energy equivalent
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Energy released in the fission of a single U23592 nucleus is 200 MeV. The fission rate of a U23592 filled reactor operating at a power level of 5 W is 

(1) 1.56×10-10 s-1                   (2) 1.56×1011 s-1

(3) 1.56×10-16 s-1                   (4) 1.56×10-17 s-1

Concept Questions :-

Nuclear binding energy
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In one α and 2 β-emissions [1999]

(1) mass number reduced by 2

(2) mass number reduces by 6 

(3) atomic number reduces by 2

(4) atomic number remains unchanged

Concept Questions :-

Types of decay
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Which of the following is used as a moderator in nuclear reactors? 

(1) Plutonium        (2) Cadmium          (3) Heavy water         (4) Uranium 

Concept Questions :-

Nuclear reactor
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Heavy water is used as a moderator in a nuclear reactor. The function of the moderator is 

(1) to control energy released in the reactor

(2) to absorb neutrons and stop the chain reaction

(3) to cool the reactor

(4) to slow down the neutrons to thermal energies

Concept Questions :-

Nuclear reactor
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Determine the energy released in the process :

H21+H21H2e4+Q

Given :M H21= 2.01471 amu

           MH2e4= 4.00388 amu

(1) 3.79 MeV              (2) 13.79 MeV               (3) 0.79 MeV           (4) 23.79 MeV

Concept Questions :-

Mass-energy equivalent
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The binding energy per nucleon of deuterium and helium atom is 1.1 MeV and 7.0 MeV. If two deuterium nuclei fuse to form a helium atom, the energy released is 

(1) 19.2 MeV            (2) 23.6 MeV             (3) 26.9 MeV                (4) 13.9 MeV

Concept Questions :-

Nuclear binding energy
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In a fission reaction,

U92236X117+Y117+n+n

the binding energy per nucleon of X and Y is 8.5 MeV whereas of U236 is 7.6 MeV. The total energy liberated will be about [1997]

(1) 2000 MeV          (2) 200 MeV               (3) 2 MeV            (4) 1 keV

Concept Questions :-

Nuclear binding energy
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A nuclear reaction along with the masses of the particle taking part in it is as follows;

   A  +  B    C  +  D  +  Q MeV1.002  1.004   1.001  1.003amu     amu     amu   amu

The energy Q liberated in the reaction is

(1) 1.234 MeV                         (2) 0.931 MeV

(3) 0.465 MeV                         (4) 1.862 MeV

Concept Questions :-

Mass-energy equivalent
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A nuclear decay is expressed as 

C116B115+β++X

Then the unknown particle X is:

(1) Neutron          (2) antineutrino             (3) proton               (4) neutrino

Concept Questions :-

Types of decay
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