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A deutron is bombarded on ${}_{8}^{16}O$ nucleus and $α$ -particle is emitted. The product nucleus is

${}_{7}^{13}N$

${}_{5}^{10}B$

${}_{4}^{9}{Be}$

${}_{7}^{14}N$

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Explanation

(d) ${}_{8}^{16}O + {}_{1}^{2}H \to {}_{7}^{14}N + {}_{2}^{4}{He}$

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A nuclear reaction given by
${}_{Z}^{A}X \to {}_{Z + 1}^{A}Y + {}_{- 1}^{0}e + \bar{p}$ represents

$γ$ -decay

Fusion

Fission

$β$ -decay

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Explanation

(d) It is a $β$ -decay

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The binding energy of nucleus is a measure of its

Charge

Mass

Momentum

Stability

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Explanation

(d) B.E. per nucleon ∝ stability.

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Heavy water is

Water at 4 $° C$

Compound of deuterium and oxygen

Compound of heavy oxygen and heavy hydrogen

Water, in which soap does not lather

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Explanation

(b) Heavy water is deuterium oxide ${}^{2}H_{2} O$

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If M is the atomic mass and A is the mass number, packing fraction is given by

$\frac{A}{M - A}$

$\frac{A - M}{A}$

$\frac{M}{M - A}$

$\frac{M - A}{A}$

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Explanation

(d) Packing fraction = $\frac{M - A}{A}$

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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 B, contains Z protons and N neutrons. The mass M(N, Z) of the nucleus is given by (c is the velocity of light)

$M (N, Z) = {NM}_{n} + {ZM}_{p} - {Bc}^{2}$

$M (N, Z) = {NM}_{n} + {ZM}_{p} + {Bc}^{2}$

$M (N, Z) = {NM}_{n} + {ZM}_{p} - B / c^{2}$

$M (N, Z) = {NM}_{n} + {ZM}_{p} + B / c^{2}$

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Explanation

$\Rightarrow M (N, Z) = {ZM}_{p} + {NM}_{n} - B / c^{2}$

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Complete the reaction
$n + {}_{92}^{235}U \to {}_{56}^{144}{Ba} + . . . + 3 n$

${}_{36}^{89}{Kr}$

${}_{36}^{90}{Kr}$

${}_{36}^{91}{Kr}$

${}_{36}^{92}{Kr}$

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Explanation

(a) ${}_{0}^{1}n + {}_{92}^{235}U \to {}_{56}^{144}{Ba} + {}_{36}^{89}{Kr} + 3 {}_{0}^{1}n$

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1 atomic mass unit is equal to

$\frac{1}{25}$ (mass of $F_{2}$ molecules)

$\frac{1}{14}$ (mass of $N_{2}$ molecules)

$\frac{1}{12}$ (mass of one C-atom)

$\frac{1}{16}$ (mass of $O_{2}$ molecules)

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Explanation

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The nucleus ${}_{92}^{234}U$ splits exactly in half in a fission reaction in which two neutrons are released. The resultant nuclei are

${}_{46}^{116}{Pd}$

${}_{45}^{117}{Rh}$

${}_{45}^{116}{Rh}$

${}_{46}^{117}{Pd}$

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Explanation

(a) ${}_{92}U^{234} \to {}_{46}X^{116} + {}_{46}X^{116} + (2 {OH}^{1}) {}_{46}X^{116} is {}_{46}{Pd}^{116}$

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Which of the following cannot cause fission in a heavy nucleus

$α$ -particle

Proton

Deutron

Laser rays

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Explanation

(d) Laser rays can not cause fission in heavy nucleus as they are combination of photons.

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