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 :

${}_{1}H_{2}+{}_{1}H_{2}\to {}_{2}H{e}^{4}+Q$

Given :M $\left({}_{1}H_{2}\right)$= 2.01471 amu

M$\left({}_{2}H{e}^{4}\right)$= 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,

${}_{92}{}^{236}U\to {}_{117}X+{}_{117}Y+n+n$

the binding energy per nucleon of X and Y is 8.5 MeV whereas of ${}_{236}U$ 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;

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

${}_{6}C_{11}\to {}_{5}B_{11}+{\beta }^{+}+X$

Then the unknown particle X is:

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

Concept Questions :-

Types of decay
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${m}_{p}$ denotes the mass of a proton and  ${m}_{n}$ that of a neutron. A given nucleus of binding energy BE, contains Z protons and N neutrons. The mass m (N, Z) of the nucleus is given by [2004]

(1) m(N, Z) = N${m}_{n}$+Z${m}_{p}$- BE${c}^{2}$

(2) m(N, Z) = N${m}_{n}$ + Z${m}_{p}$ + BE${c}^{2}$

(3) m(N, Z) = N${m}_{n}$ + Z${m}_{p}$ - BE / ${c}^{2}$

(4) m(N, Z) = N${m}_{n}$ + Z${m}_{p}$ + BE / ${c}^{2}$

Concept Questions :-

Nuclear binding energy
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When a deuterium is bombarded on ${}_{8}O_{16}$ nucleus, an $\alpha$-particle is emitted, then the product nucleus is [2002]

(1) ${}_{7}N_{13}$          (2) ${}_{5}B_{10}$              (3) ${}_{4}B{e}^{9}$                 (4) ${}_{7}N_{14}$

Concept Questions :-

Types of decay
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A nuclear reaction given by    [2003]

(1) fusion         (2) fission           (3) $\beta$-decay         (4) $\gamma$-decay

Concept Questions :-

Types of decay
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