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

Subtopic:  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

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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

Subtopic:  Types of Decay |
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The rate of disintegration of a fixed quantity of a radioactive substance can be increased by

(1) increasing the temperature

(2) increasing the pressure

(3) chemical reaction

(4) it is not possible 

Subtopic:  Radioactivity (OLD NCERT) |
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The energy released by the fission of one  uranium atom is 200 MeV. The number of fission per second required to produce 3.2 W of power is (Take, 1 eV = 1.6×10-19 J) [WB JEE 2010]

(1) 107           (2) 1010         (3) 1015          (4) 1011

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Half-life of a radioactive substance is 12.5 h and its mass is 256 g. After what time, the amount of remaining substance is 1 g? [2001]

(1) 75 h          (2) 100 h            (3) 125 h          (4) 150 h

Subtopic:  Radioactivity (OLD NCERT) |
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A radioactive nucleus undergoes a series of decay according to the scheme 

AαA1βA2αA3γA4

If the mass number and atomic number of A are 180 and 72 respectively, then what are these number for A4?

(1) 172 and 69                         (2) 174 and 70

(3) 176 and 69                         (4) 176 and 70

Subtopic:  Radioactivity (OLD NCERT) |
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The radioactivity of an element becomes 164th of its original value in 60 seconds. Then the half value period is

(1) 5 sec              (2) 10 sec            (3) 20 sec            (4) 30 sec

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A and B are two radioactive substances whose half-lives are 1 and 2 years respectively. Initially 10 g of A and 1 g of B is taken. The time (approximate) after which they will have the same quantity remaining is

(1) 6.62 yr                (2) 5 yr                (3) 3.2 yr                   (4) 7 yr

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Complete the equation for the following fission process-

U92235+n01Sr3890+........  

(1) Xe54143+3 n01                      (2) Xe54145

(3) Xe57142                                   (4) Xe54142+n01

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