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question_answer1)
The particles which can be added to the nucleus of an atom without changing its chemical properties are called
A)
Electrons done
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B)
Protons done
clear
C)
Neutrons done
clear
D)
None of the above done
clear
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question_answer2)
The masses of neutron and proton are 1.0087 a.m.u. and 1.0073 a.m.u. respectively. If the neutrons and protons combine to form a helium nucleus (alpha particles) of mass 4.0015 a.m.u. The binding energy of the helium nucleus will be (1 a.m.u.= 931MeV)
A)
28.4 MeV done
clear
B)
20.8 MeV done
clear
C)
27.3 MeV done
clear
D)
14.2 MeV done
clear
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question_answer3)
In \[_{88}R{{a}^{226}}\]nucleus, there are
A)
138 protons and 88 neutrons done
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B)
138 neutrons and 88 protons done
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C)
226 protons and 88 electrons done
clear
D)
226 neutrons and 138 electrons done
clear
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question_answer4)
If the binding energy per nucleon in \[L{{i}^{7}}\]and \[H{{e}^{4}}\] nuclei are respectively 5.60 MeV and 7.06 MeV, then energy of reaction \[L{{i}^{7}}+p\to 2{{\ }_{2}}H{{e}^{4}}\] is
A)
19.6 MeV done
clear
B)
2.4 MeV done
clear
C)
8.4 MeV done
clear
D)
17.3 MeV done
clear
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question_answer5)
\[{{M}_{n}}\] and \[{{M}_{p}}\] represent mass of neutron and proton respectively. If an element having atomic mass M has N-neutron and Z-proton, then the correct relation will be
A)
\[M<[N{{M}_{n}}+Z{{M}_{P}}]\] done
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B)
\[M>[N{{M}_{n}}+Z{{M}_{P}}]\] done
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C)
\[M=[N{{M}_{n}}+Z{{M}_{P}}]\] done
clear
D)
\[M=N[{{M}_{n}}+{{M}_{P}}]\] done
clear
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question_answer6)
Energy generation in stars is mainly due to
A)
Chemical reactions done
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B)
Fission of heavy nuclei done
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C)
Fusion of light nuclei done
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D)
Fusion of heavy nuclei done
clear
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question_answer7)
200 MeV of energy may be obtained per fission of \[{{U}^{235}}\]. A reactor is generating 1000 kW of power. The rate of nuclear fission in the reactor is
A)
1000 done
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B)
\[2\times {{10}^{8}}\] done
clear
C)
\[3.125\times {{10}^{16}}\] done
clear
D)
931 done
clear
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question_answer8)
Nuclear fission was discovered by
A)
Auto Hahn and F. strassmann done
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B)
Fermi done
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C)
Bethe done
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D)
Rutherford done
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question_answer9)
In the following reaction the value of X is \[_{7}{{N}^{14}}{{+}_{2}}H{{e}^{4}}\,\to \,X{{+}_{1}}{{H}^{1}}\]
A)
\[_{8}{{N}^{17}}\] done
clear
B)
\[_{8}{{O}^{17}}\] done
clear
C)
\[_{7}{{O}^{16}}\] done
clear
D)
\[_{7}{{N}^{16}}\] done
clear
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question_answer10)
1 atomic mass unit is equal to
A)
\[\frac{1}{25}\] (mass of \[{{F}_{2}}\] molecules) done
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B)
\[\frac{1}{14}\] (mass of \[{{N}_{2}}\] molecules) done
clear
C)
\[\frac{1}{12}\] (mass of one C-atom) done
clear
D)
\[\frac{1}{16}\] (mass of \[{{O}_{2}}\] molecules) done
clear
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question_answer11)
In the reaction \[_{1}^{2}H+_{1}^{3}H\to _{2}^{4}He+_{0}^{1}n\]. If the tending energies of \[_{1}^{2}H,\text{ }_{1}^{3}H\text{ and }_{2}^{4}He\] are respectively \[a,\text{ b and }c\] (in MeV), then the energy (in MeV) released in this reaction is
A)
\[c+a-b\] done
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B)
\[c-a-b\] done
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C)
\[a+b+c\] done
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D)
\[a+b-c\] done
clear
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question_answer12)
Some radioactive nucleus may emit
A)
Only one \[-13.6\ eV\] or \[\gamma \]at a time done
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B)
All the three \[_{92}{{U}^{238}}\] and \[\gamma \] one after another done
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C)
All the three \[\alpha ,\ \beta \] and \[\gamma \] simultaneously done
clear
D)
Only\[\alpha \] and \[\beta \] simultaneously done
clear
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question_answer13)
Which of the following is in the increasing order for penetrating power
A)
\[\alpha ,\ \beta ,\ \gamma \] done
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B)
\[\beta ,\ \alpha ,\ \gamma \] done
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C)
\[\gamma ,\ \alpha ,\ \beta \] done
clear
D)
\[\gamma ,\ \beta ,\ \alpha \] done
clear
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question_answer14)
A sample contains 16 gm of a radioactive material, the half-life of which is two days. After 32 days, the amount of radioactive material left in the sample is
A)
Less than 1 mg done
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B)
\[\frac{1}{4}gm\] done
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C)
\[\frac{1}{2}gm\] done
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D)
1 gm done
clear
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question_answer15)
Unit of radioactivity is Rutherford. Its value is
A)
\[3.7\times {{10}^{10}}\]disi tegrations/sec done
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B)
\[3.7\times {{10}^{6}}\]disintegrations/sec done
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C)
\[1.0\times {{10}^{10}}\] disintegrations/sec done
clear
D)
\[1.0\times {{10}^{6}}\] disintegrations/sec done
clear
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question_answer16)
Decay constant of radium is\[\lambda \]. By a suitable process its compound radium bromide is obtained. The decay constant of radium bromide will be
A)
\[\lambda \] done
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B)
More than \[\lambda \] done
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C)
Less than \[\lambda \] done
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D)
Zero done
clear
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question_answer17)
In the given nuclear reaction A, B, C, D, E represents \[_{92}{{U}^{238}}{{\xrightarrow{\alpha }}_{B}}T{{h}^{A}}{{\xrightarrow{\beta }}_{D}}P{{a}^{C}}{{\xrightarrow{E}}_{92}}{{U}^{234}}\]
A)
A = 234, B = 90, C = 234, D = 91, E = \[\beta \] done
clear
B)
A = 234, B = 90, C = 238, D = 94, E = \[\alpha \] done
clear
C)
A = 238, B = 93, C = 234, D = 91, E = \[\beta \] done
clear
D)
A = 234, B = 90, C = 234, D = 93, E = \[\alpha \] done
clear
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question_answer18)
The activity of a radioactive sample
A)
Can be increased by heating it done
clear
B)
Is independent of physical parameter done
clear
C)
Cannot be increased by any method done
clear
D)
Both [b] and [c] done
clear
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question_answer19)
99% of a radioactive element will decay between
A)
6 and 7 half lives done
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B)
7 and 8 half lives done
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C)
8 and 9 half lives done
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D)
9 half lives done
clear
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question_answer20)
Nucleus produced due to a-decay of the nucleus \[_{Z}{{X}^{A}}\] is
A)
\[_{Z+2}{{Y}^{A+4}}\] done
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B)
\[_{Z}{{Y}^{A}}\] done
clear
C)
\[_{Z-2}{{Y}^{A-4}}\] done
clear
D)
\[_{Z-4}{{Y}^{A-2}}\] done
clear
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question_answer21)
The half-life of a sample of a radioactive substance is 1 hour. If \[8\times {{10}^{10}}\] atoms are present at \[t=0\], then the number of atoms decayed in the duration \[t=2\] hour to \[t=4\] hour will be
A)
\[2\times {{10}^{10}}\] done
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B)
\[1.5\times {{10}^{10}}\] done
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C)
Zero done
clear
D)
Infinity done
clear
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question_answer22)
A nucleus decays by \[{{\beta }^{+}}\] emission followed by a gamma emission. If the atomic and mass numbers of the parent nucleus are Z and A respectively, the corresponding numbers for the daughter nucleus are respectively.
A)
\[Z-1\] and \[A-1\] done
clear
B)
\[Z+1\] and \[A\] done
clear
C)
\[Z-1\] and \[A\] done
clear
D)
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question_answer23)
Consider two nuclei of the same radioactive nuclide. One of the nuclei was created in a supernova explosion 5 billion years ago. The other was created in a nuclear reactor 5 minutes ago. The probability of decay during the next time is
A)
Different for each nuclei done
clear
B)
Nuclei created in explosion decays first done
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C)
Nuclei created in the reactor decays first done
clear
D)
Independent of the time of creation done
clear
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question_answer24)
Size of nucleus is of the order of
A)
\[{{10}^{-10}}m\] done
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B)
\[{{10}^{-15}}m\] done
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C)
\[{{10}^{-12}}m\] done
clear
D)
\[{{10}^{-19}}m\] done
clear
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question_answer25)
One requires energy \[{{E}_{n}}\]to remove a nucleon from a nucleus and an energy \['{{E}_{e}}'\]to remove an electron from the orbit of an atom. Then
A)
\[{{E}_{n}}={{E}_{e}}\] done
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B)
\[{{E}_{n}}<{{E}_{e}}\] done
clear
C)
\[{{E}_{n}}>{{E}_{e}}\] done
clear
D)
\[{{E}_{n}}\ge {{E}_{e}}\] done
clear
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question_answer26)
Nucleus of an atom whose atomic mass is 24 consists of
A)
11 electrons, 11 protons and 13 neutrons done
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B)
11 electrons, 13 protons and 11 neutrons done
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C)
11 protons and 13 neutrons done
clear
D)
11 protons and 13 electrons done
clear
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question_answer27)
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
A)
200 KeV done
clear
B)
2 MeV done
clear
C)
200 MeV done
clear
D)
2000 MeV done
clear
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question_answer28)
Which of the following isotopes is normally fissionable?
A)
\[_{92}{{U}^{238}}\] done
clear
B)
\[_{93}N{{p}^{239}}\] done
clear
C)
\[\frac{9}{5}\] done
clear
D)
\[\frac{{{n}^{2}}}{Z}\] done
clear
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question_answer29)
During the nuclear fusion reaction
A)
A heavy nucleus breaks into two fragments by itself done
clear
B)
A light nucleus bombarded by thermal neutrons breaks up done
clear
C)
A heavy nucleus bombarded by thermal neutrons breaks up done
clear
D)
Two light nuclei combine to give a heavier nucleus and possibly other products done
clear
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question_answer30)
g-rays radiation can be used to create electron-positron pair. In this process of pair production, g-rays energy cannot be less than
A)
5.0 MeV done
clear
B)
4.02 MeV done
clear
C)
15.0 MeV done
clear
D)
1.02 MeV done
clear
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question_answer31)
\[_{1}{{H}^{1}}{{+}_{1}}{{H}^{1}}{{+}_{1}}{{H}^{2}}\to X+{{\ }_{+1}}{{e}^{0}}+\]energy. The emitted particle is
A)
Neutron done
clear
B)
Proton done
clear
C)
\[\alpha -\]particle done
clear
D)
Neutrino done
clear
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question_answer32)
In an atomic bomb, the energy is released due to
A)
Chain reaction of neutrons and \[_{92}{{U}^{235}}\] done
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B)
Chain reaction of neutrons and \[_{92}{{U}^{238}}\] done
clear
C)
Chain reaction of neutrons and \[_{92}{{P}^{240}}\] done
clear
D)
Chain reaction of neutrons and \[_{92}{{U}^{236}}\] done
clear
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question_answer33)
The principle of controlled chain reaction is used in
A)
Atomic energy reactor done
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B)
Atom bomb done
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C)
The core of sun done
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D)
Artificial radioactivity done
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question_answer34)
The example of nuclear fusion is
A)
Formation of Ba and Kr from U235 done
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B)
Formation of He from H done
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C)
Formation of Pu 235 from U 235 done
clear
D)
Formation of water from hydrogen and oxygen done
clear
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question_answer35)
Beta rays emitted by a radioactive material are
A)
Electromagnetic radiation done
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B)
The electrons orbiting around the nucleus done
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C)
Charged particles emitted by nucleus done
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D)
Neutral particles done
clear
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question_answer36)
The average life T and the decay constant \[\lambda \] of a radioactive nucleus are related as
A)
\[T\lambda =1\] done
clear
B)
\[T=\frac{0.693}{\lambda }\] done
clear
C)
\[\frac{T}{\lambda }=1\] done
clear
D)
\[{{\lambda }_{1}},\ {{\lambda }_{2}},\ {{\lambda }_{3}}\] done
clear
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question_answer37)
An archaeologist analyses the wood in a prehistoric structure and finds that \[{{C}^{14}}\](Half life = 5700 years) to \[{{C}^{12}}\]is only one- fourth of that found in the cells buried plants. The age of the wood is about
A)
5700 years done
clear
B)
2850 years done
clear
C)
11,400 years done
clear
D)
22,800 years done
clear
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question_answer38)
A radioactive nucleus \[_{92}{{X}^{235}}\]decays to \[_{91}{{Y}^{231}}\]. Which of the following particles are emitted
A)
One alpha and one electron done
clear
B)
Two deuterons and one positron done
clear
C)
One alpha and one proton done
clear
D)
One proton and four neutrons done
clear
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question_answer39)
The half life of \[^{131}I\] is 8 days. Given a sample of \[^{131}I\] at time t = 0, we can assert that
A)
No nucleus will decay before t = 4 days done
clear
B)
No nucleus will decay before t = 8 days done
clear
C)
All nuclei will decay before t = 16 days done
clear
D)
A given nucleus may decay at any time after t = 0 done
clear
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question_answer40)
Consider the following two statements |
A. Energy spectrum of \[\alpha \]-particles emitted in radioactive decay is discrete |
B. Energy spectrum of \[\beta \]-particles emitted in radioactive decay is continuous |
A)
Only A is correct done
clear
B)
Only B is correct done
clear
C)
A is correct but B is wrong done
clear
D)
Both A and B are correct done
clear
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