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The average kinetic energy of the thermal neutrons is of the order of

0.03 eV

3 eV

3 KeV

3 MeV

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Explanation

(a)

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Which of the following isotopes is normally fissionable ?

${}_{92}U_{238}$

${}_{93}{Np}_{239}$

${}_{92}U_{235}$

${}_{2}{He}_{4}$

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Explanation

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The process by which a heavy nucleus splits into light nuclei is known as

Fission

$α$ -decay

Fusion

Chain reaction

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Explanation

(a) The process is known as fission reaction.

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The explosion of the atomic bomb takes place due to

Nuclear fission

Nuclear fusion

Scattering

Thermionic emission

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Explanation

(a) In atom bomb nuclear fission takes place with huge temperature.

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In nuclear reaction ${}_{2}{He}_{4} + {}_{Z}X_{{}_{A}} \to {}_{z + 2}Y_{A + 3} + A$ , A denotes

Electron

Positron

Proton

Neutron

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Explanation

(d) The given equation is ${}_{2}{He}_{4} + {}_{Z}X_{{}_{A}} \to {}_{z + 2}Y_{A + 3} + A$
Applying charge and mass conservation

4+A=A+3+x $\Rightarrow$ x = 1 $\Rightarrow$ 2+z = z+2+n $\Rightarrow$ n = 0

Hence A is a neutron.

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Energy generation in stars is mainly due to

Chemical reactions

Fission of heavy nuclei

Fusion of light nuclei

Fusion of heavy nuclei

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Explanation

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Fusion reaction is initiated with the help of

Low temperature

High temperature

Neutrons

Any particle

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Explanation

(b) Fusion reaction requires a very high temperature =(10⁷ K).

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When a ${}_{4}{Be}_{9}$ atom is bombarded with $α$ particles, one of the product of nuclear transmutation is ${}_{6}C_{12}$ . The other is

${}_{- 1}e_{0}$

${}_{1}H_{1}$

${}_{1}D_{2}$

${}_{0}n_{1}$

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Explanation

(d) ${}_{4}{Be}_{9} + {}_{2}{He}_{4} \to {}_{6}C_{12} + {}_{0}n_{1}$

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During the nuclear fusion reaction

A heavy nucleus breaks into two fragments by itself

A light nucleus bombarded by thermal neutrons breaks up

A heavy nucleus bombarded by thermal neutrons breaks up

Two light nuclei combine to give a heavier nucleus and
possibly other products

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Explanation

(d) During the nuclear fusion reaction two light nuclei combine to give a heavy nuclei and possible other products.

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The main source of solar energy is

Fission reactions

Fusion reactions

Chemical reactions

Combustion reactions

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Explanation

(b) The main source of solar energy is fusion reactions of hydrogen atoms.

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