The nuclear reaction H 1 2 + H 1 2 → He 2 4 (mass of deuteron = 2.0141 a.m.u. and mass of He = 4.0024 a.m.u.) is

Fusion reaction releasing 24 MeV energy

Fusion reaction absorbing 24 MeV energy

Fission reaction releasing 0.0258 MeV energy

Fission reaction absorbing 0.0258 MeV energy

Compound of deuterium and oxygen

Compound of heavy oxygen and heavy hydrogen

Water in which soap does not lather

Physics - Nuclei - Quiz-7

During the nuclear fusion reaction

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A heavy nucleus breaks into two fragments by itself
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A light nucleus bombarded by thermal neutrons breaks up
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A heavy nucleus bombarded by thermal neutrons breaks up
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Two light nuclei combine to give a heavier nucleus and possibly other products

A gamma ray photon creates an electron- positron pair. If the rest mass energy of an electron is 0.5 MeV and the total K.E. of the electron- positron pair is 0.78 MeV, then the energy of the gamma ray photon must be

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0.78 MeV
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1.78 MeV
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1.28 MeV
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0.28 MeV

Which of the following statement is true

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${}_{78}{Pt}_{192}$ has 78 neutrons
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${}_{84}{Po}_{214} \to {}_{82}{Pb}_{210} + β^{-}$
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${}_{92}U_{238} \to {}_{90}{Th}_{234} + {}_{2}{He}_{4}$
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${}_{90}{Th}_{234} \to {}_{91}{Pa}_{234} + {}_{2}{He}_{4}$

Fast neutrons can easily be slowed down by

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The use of lead shielding
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Passing them through heavy water
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Elastic collisions with heavy nuclei
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Applying a strong electric field

When ${}_{92}U_{235}$ undergoes fission, 0.1% of its original mass is changed into energy. How much energy is released if 1kg of ${}_{92}U_{235}$ undergoes fission

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$9 \times 10^{10} J$
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$9 \times 10^{11} J$
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$9 \times 10^{12} J$
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$9 \times 10^{13} J$

$γ$ -rays radiation can be used to create electron-positron pair. In this process of pair production, $γ$ -rays energy cannot be less than

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5.0 MeV
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4.02 MeV
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15.0 MeV
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1.02 MeV

A reaction between a proton and ${}_{8}O_{18}$ that produces ${}_{9}F_{18}$ must also liberate

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

In the nuclear reaction ${}_{92}U_{238} \to {}_{z}{Th}_{A} + {}_{2}{He}_{4}$ , the values of A and Z are

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A = 234, Z = 94
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A = 234, Z = 90
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A = 238, Z = 94
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A = 238, Z = 90

If 200 MeV energy is released in the fission of a single $U^{235}$ nucleus, the number of fissions required per second to produce 1 kilowatt power shall be (Given

$1 eV = 1.6 \times 10^{- 19} J$ )

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$3.125 \times 10^{13}$
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$3.125 \times 10^{14}$
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$3.125 \times 10^{15}$
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$3.125 \times 10^{16}$

In nuclear fission, the fission reactions proceeds with a projectile. Which of the following suits the best

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Slow proton
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Fast neutron
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Slow neutron
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None of these

In the nuclear reaction ${}_{85}^{297}X \to Y + 4 α$ , Y is

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${}_{76}Y_{287}$
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${}_{77}Y_{285}$
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${}_{77}Y_{281}$
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${}_{77}Y_{289}$

Thermal neutrons can cause fission in

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$U^{235}$
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$U^{238}$
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${Pu}^{238}$
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${Th}^{232}$

When neutrons are bombarded on nucleus of ${}_{92}U_{235}$ , the number of emitted neutrons will be

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1
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2
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3
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4

The energy released in a typical nuclear fusion reaction is approximately

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25 MeV
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200 MeV
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800 MeV
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1050 MeV

Which one of the following nuclear reactions is a source of energy in the sun

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${}_{4}^{9}{Be} + {}_{2}^{4}{He} \to {}_{6}^{12}C + {}_{0}^{- 1}n$
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${}_{2}^{3}{He} + {}_{2}^{3}{He} \to {}_{2}^{4}{He} + {}_{1}^{1}H + {}_{1}^{1}H$
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${}_{56}^{144}{Ba} + {}_{56}^{92}{Kr} \to {}_{92}^{235}U + {}_{0}^{- 1}n$
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${}_{26}^{56}{Fe} + {}_{48}^{112}{Ca} \to {}_{74}^{167}W + {}_{0}^{- 1}n$

Which of these is a fusion reaction

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${}_{1}^{3}H + {}_{1}^{2}H \to {}_{2}^{4}{He} + {}_{0}^{1}n$
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${}_{92}^{238}U \to {}_{82}^{206}{Pb} + 8 ({}_{2}^{4}{He}) + 6 ({}_{- 1}^{0}β)$
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${}_{7}^{12}C \to {}_{6}^{12}C + β^{+} + γ$
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None of these

In a nuclear fission reaction

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Two light nuclei combine to produce a heavier nucleus
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A light nucleus bombarded by thermal neutrons breaks up
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A heavy nucleus bombarded by thermal neutrons breaks up
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A heavy nucleus breaks up by itself

Hydrogen bomb is based on which of the following phenomenon

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Nuclear fission
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Nuclear fusion
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Radioactive decay
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None of these

The number of neutrons released when ${}_{92}U_{235}$ undergoes fission by absorbing ${}_{0}^{1}n$ and $({}_{56}^{144}{Ba} + {}_{36}^{89}{Kr})$ are formed, is

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0
0%

1
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2
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3

Which of the following particle has similar mass to electron

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Proton
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Neutron
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Positron
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Neutrino

Neutrino is a particle, which is

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Charged and has spin
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Charged and has no spin
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Charge less and has spin
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Charge less and has no spin

To generate a power of 3.2 mega watt, the number of fissions of $U^{235}$ per minute is
(Energy released per fission = 200MeV, $1 eV = 1.6 \times 10^{- 19} J$

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$6 \times 10^{18}$
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$6 \times 10^{17}$
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$10^{17}$
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$6 \times 10^{16}$

The average number of prompt neutrons produced per fission of $U^{235}$ is

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More than 5
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3 to 5
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2 to 3
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1 to 2

In an atomic bomb, the energy is released due to

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Chain reaction of neutrons and ${}_{92}^{235}U$
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Chain reaction of neutrons and ${}_{92}^{288}U$
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Chain reaction of neutrons and ${}_{92}^{240}P$
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Chain reaction of neutrons and ${}_{92}^{286}U$

If an electron and a positron annihilate, then the energy released is:

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$3.2 \times 10^{- 13} J$
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$1.6 \times 10^{- 13} J$
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$4.8 \times 10^{- 13} J$
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$6.4 \times 10^{- 13} J$

The nuclear reaction ${}_{1}^{2}H + {}_{1}^{2}H \to {}_{2}^{4}{He}$ (mass of deuteron = 2.0141 a.m.u. and mass of He = 4.0024 a.m.u.) is

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Fusion reaction releasing 24 MeV energy
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Fusion reaction absorbing 24 MeV energy
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Fission reaction releasing 0.0258 MeV energy
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Fission reaction absorbing 0.0258 MeV energy

In the following reaction the value of ‘X’ is
${}_{7}^{14}N + {}_{2}^{4}{He} \to X + {}_{1}^{1}H$

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${}_{8}^{17}N$
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${}_{8}^{17}O$
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${}_{7}^{16}O$
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${}_{7}^{16}N$

The binding energy of nucleus is a measure of its

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Charge
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Mass
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Momentum
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Stability

Heavy water is

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Water at 4 $° C$
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Compound of deuterium and oxygen
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Compound of heavy oxygen and heavy hydrogen
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Water in which soap does not lather

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

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

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Practice Physics Quiz Questions and Answers

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Practice Physics Quiz Questions and Answers

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