-
question_answer1)
Nucleons are [CPMT 1982]
A)
Protons and electrons done
clear
B)
Protons and neutrons done
clear
C)
Electrons and neutrons done
clear
D)
Electrons, protons and neutrons done
clear
View Solution play_arrow
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question_answer2)
A deutron contains [NCERT 1982; CPMT 1994]
A)
A neutron and a positron done
clear
B)
A neutron and a proton done
clear
C)
A neutron and two protons done
clear
D)
A proton and two neutrons done
clear
View Solution play_arrow
-
question_answer3)
The nucleus of radioactive element possesses
A)
Low binding energy done
clear
B)
High binding energy done
clear
C)
Zero binding energy done
clear
D)
High potential energy done
clear
View Solution play_arrow
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question_answer4)
On bombarding \[_{7}{{N}^{14}}\] with \[\alpha \]-particles, the nuclei of the product formed after the release of a proton will be or In nuclear reaction \[_{7}{{N}^{14}}+{{\,}_{2}}H{{e}^{4}}{{\to }_{Z}}{{X}^{A}}{{+}_{1}}{{H}^{1}}\], the term \[_{Z}{{X}^{A}}\] represents [NCERT 1979; MP PMT 1989; MNR 1995; MP PET 1996; BHU 1996]
A)
\[_{8}{{O}^{17}}\] done
clear
B)
\[_{9}{{F}^{18}}\] done
clear
C)
\[_{9}{{F}^{17}}\] done
clear
D)
\[_{8}{{O}^{18}}\] done
clear
View Solution play_arrow
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question_answer5)
Nuclear energy is based on the conversion of
A)
Protons into neutrons done
clear
B)
Mass into energy done
clear
C)
Neutrons into protons done
clear
D)
Uranium into radium done
clear
View Solution play_arrow
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question_answer6)
Positron has nearly the same weight as that of [NCERT 1975; JIPMER 1991; BHU 1995]
A)
\[\alpha \]-particle done
clear
B)
Proton done
clear
C)
Neutron done
clear
D)
Electron done
clear
View Solution play_arrow
-
question_answer7)
In the reaction \[_{3}L{{i}^{6}}+(?)\to {{\ }_{2}}H{{e}^{4}}+{{\ }_{1}}{{H}^{3}}\]. The missing particle is [CPMT 1983, 84]
A)
Electron done
clear
B)
Neutron done
clear
C)
Proton done
clear
D)
Deutron done
clear
View Solution play_arrow
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question_answer8)
The \[_{6}{{C}^{14}}\] in upper atmosphere is generated by the nuclear reaction [MP PET 1993]
A)
\[_{7}{{N}^{14}}+{{\ }_{1}}{{H}^{1}}\xrightarrow{{}}{{\ }_{6}}{{C}^{14}}+{{\ }_{+1}}{{e}^{0}}+{{\ }_{1}}{{H}^{1}}\] done
clear
B)
\[_{7}{{N}^{14}}\xrightarrow{{}}{{\ }_{6}}{{C}^{14}}+{{\ }_{+1}}{{e}^{0}}\] done
clear
C)
\[_{7}{{N}^{14}}+{{\ }_{0}}{{n}^{1}}\xrightarrow{{}}{{\ }_{6}}{{C}^{14}}+{{\ }_{1}}{{H}^{1}}\] done
clear
D)
\[_{7}{{N}^{14}}+{{\ }_{1}}{{H}^{3}}+{{\ }_{0}}{{n}^{1}}\xrightarrow{{}}{{\ }_{6}}{{C}^{14}}+{{\ }_{2}}H{{e}^{4}}\] done
clear
View Solution play_arrow
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question_answer9)
Deuterons when bombarded on a nuclide produce \[_{18}A{{r}^{38}}\] and neutrons. The target is [CPMT 1982, 87]
A)
\[_{17}C{{l}^{35}}\] done
clear
B)
\[_{19}{{K}^{27}}\] done
clear
C)
\[_{17}C{{l}^{37}}\] done
clear
D)
\[_{19}{{K}^{39}}\] done
clear
View Solution play_arrow
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question_answer10)
Which can be used for carrying out nuclear reaction [AFMC 2003]
A)
Uranium ? 238 done
clear
B)
Neptunium ? 239 done
clear
C)
Thorium ? 232 done
clear
D)
Plutonium ? 239 done
clear
View Solution play_arrow
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question_answer11)
On comparing chemical reactivity of \[{{C}^{12}}\] and \[{{C}^{14}}\], it is revealed that
A)
\[{{C}^{12}}\] is more reactive done
clear
B)
\[{{C}^{14}}\] is more reactive done
clear
C)
Both are inactive done
clear
D)
Both are equally active done
clear
View Solution play_arrow
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question_answer12)
The radionucleide \[_{90}^{234}Th\] undergoes two successive \[\beta \]-decays followed by one \[\alpha \]-decay. The atomic number and the mass number respectively of the resulting radionucleide are [AIEEE 2003]
A)
92 and 234 done
clear
B)
94 and 230 done
clear
C)
90 and 230 done
clear
D)
92 and 230 done
clear
View Solution play_arrow
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question_answer13)
Hydrogen and deuterium differ in [CPMT 1980]
A)
Reactivity with oxygen done
clear
B)
Reactivity with chlorine done
clear
C)
Melting point done
clear
D)
Reducing action done
clear
View Solution play_arrow
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question_answer14)
A nuclear reaction must be balanced in terms of
A)
Only energy done
clear
B)
Only mass done
clear
C)
Mass and energy done
clear
D)
None of these done
clear
View Solution play_arrow
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question_answer15)
In the following nuclear reaction, the other product is \[_{52}T{{e}^{130}}{{+}_{1}}{{H}^{2}}{{\xrightarrow{{}}}_{53}}{{I}^{131}}+?\] [MP PET 1991]
A)
Positron done
clear
B)
Alpha particle done
clear
C)
One neutron done
clear
D)
Proton done
clear
View Solution play_arrow
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question_answer16)
The reaction \[_{5}{{B}^{8}}{{\to }_{4}}B{{e}^{8}}{{+}_{1}}{{e}^{0}}\] is due to [MP PMT 1991]
A)
Loss of \[\alpha \]-particles done
clear
B)
Loss of \[\beta \]-particles done
clear
C)
Loss of positron done
clear
D)
Electron loss done
clear
View Solution play_arrow
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question_answer17)
Positronium is the name given to an atom-like combination formed between [NCERT 1980; JIPMER 1991]
A)
A positron and a proton done
clear
B)
A positron and a neutron done
clear
C)
A positron and \[\alpha \]-particle done
clear
D)
A positron and an electron done
clear
View Solution play_arrow
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question_answer18)
An electrically charged atom or a group of atoms is known as [BHU 1979]
A)
A meson done
clear
B)
A proton done
clear
C)
An ion done
clear
D)
A cyclotron done
clear
View Solution play_arrow
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question_answer19)
The charge on positron is equal to the charge on which one of the following [NCERT 1977]
A)
Proton done
clear
B)
Electron done
clear
C)
\[\alpha \]-particle done
clear
D)
Neutron done
clear
View Solution play_arrow
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question_answer20)
In the nuclear reaction \[_{12}M{{g}^{24}}{{+}_{2}}H{{e}^{4}}{{=}_{0}}{{n}^{1}}+?\] The product nucleus is [BHU 1987]
A)
\[_{13}A{{l}^{27}}\] done
clear
B)
\[_{14}S{{i}^{27}}\] done
clear
C)
\[_{13}A{{l}^{28}}\] done
clear
D)
\[_{12}M{{g}^{25}}\] done
clear
View Solution play_arrow
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question_answer21)
\[_{6}{{C}^{14}}\] is formed from \[_{7}{{N}^{14}}\] in the upper atmosphere by the action of the fundamental particle [Orissa JEE 2002]
A)
Positron done
clear
B)
Neutron done
clear
C)
Electron done
clear
D)
Proton done
clear
View Solution play_arrow
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question_answer22)
In the nuclear reaction \[_{92}{{U}^{238}}{{\to }_{82}}P{{b}^{206}}+x{{\,}_{2}}H{{e}^{4}}+y{{\,}_{-1}}{{\beta }^{0}}\] the value of x and y are respectively ??.. [Orissa JEE 2002]
A)
8, 6 done
clear
B)
6, 4 done
clear
C)
6, 8 done
clear
D)
8, 10 done
clear
View Solution play_arrow
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question_answer23)
If an isotope of hydrogen has two neutrons in its atom, its atomic number and atomic mass number will respectively be [CBSE 1992]
A)
2 and 1 done
clear
B)
3 and 1 done
clear
C)
1 and 1 done
clear
D)
1 and 3 done
clear
View Solution play_arrow
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question_answer24)
Which one of the following nuclear transformation is (n, p ) type [AIIMS 1980, 83]
A)
\[_{3}L{{i}^{7}}+{{\,}_{1}}{{H}^{1}}\xrightarrow{{}}{{\,}_{4}}B{{e}^{7}}+{{\,}_{0}}{{n}^{1}}\] done
clear
B)
\[_{33}A{{s}^{75}}+{{\,}_{2}}H{{e}^{4}}\xrightarrow{{}}{{\,}_{35}}B{{r}^{78}}+{{\,}_{0}}{{n}^{1}}\] done
clear
C)
\[_{83}B{{i}^{209}}+{{\,}_{1}}{{H}^{2}}\xrightarrow{{}}{{\,}_{84}}P{{o}^{210}}+{{\,}_{0}}{{n}^{1}}\] done
clear
D)
\[_{21}S{{c}^{45}}+{{\,}_{0}}{{n}^{1}}\xrightarrow{{}}{{\,}_{20}}C{{a}^{45}}+{{\,}_{1}}{{H}^{1}}\] done
clear
View Solution play_arrow
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question_answer25)
What is X in the following nuclear reaction \[_{7}{{N}^{14}}+{{\ }_{1}}{{H}^{1}}{{\xrightarrow{{}}}_{8}}{{O}^{15}}+X\] [AIIMS 1983; MP PET 1997]
A)
\[_{+1}{{e}^{0}}\] done
clear
B)
\[_{0}{{n}^{1}}\] done
clear
C)
\[\gamma \] done
clear
D)
\[_{-1}{{e}^{0}}\] done
clear
View Solution play_arrow
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question_answer26)
In the reaction \[_{93}N{{p}^{239}}{{\xrightarrow{{}}}_{94}}P{{u}^{239}}\] + (?), the missing particle is [MNR 1987]
A)
Proton done
clear
B)
Positron done
clear
C)
Electron done
clear
D)
Neutron done
clear
View Solution play_arrow
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question_answer27)
According to the nuclear reaction \[_{4}Be{{+}_{2}}H{{e}^{4}}{{\to }_{6}}{{C}^{12}}{{+}_{0}}n{{}^{1}}\], mass number of \[(Be)\] atom is [AFMC 2002]
A)
4 done
clear
B)
9 done
clear
C)
7 done
clear
D)
6 done
clear
View Solution play_arrow
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question_answer28)
Which of the following nuclides has the magic number of both protons and neutrons [EAMCET 1989]
A)
\[_{50}S{{n}^{115}}\] done
clear
B)
\[_{82}P{{b}^{206}}\] done
clear
C)
\[_{82}P{{b}^{208}}\] done
clear
D)
\[_{50}S{{n}^{118}}\] done
clear
View Solution play_arrow
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question_answer29)
In the carbon cycle, from which hot stars obtain their energy, the \[_{6}{{C}^{14}}\] nucleus is
A)
Completely converted into energy done
clear
B)
Regenerated at the end of the cycle done
clear
C)
Combined with oxygen to form carbon monoxide done
clear
D)
Broken up into its constituents protons and neutrons done
clear
View Solution play_arrow
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question_answer30)
The atomic mass of lead is 208 and atomic number is 82. The atomic mass of bismuth is 209 and atomic number is 83. The ratio of n/p in the atom is [EAMCET 1982]
A)
Higher of lead done
clear
B)
Higher of bismuth done
clear
C)
Same done
clear
D)
None of these done
clear
View Solution play_arrow
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question_answer31)
Which of the following is an \[n,\,p\] reaction [BHU 1995]
A)
\[_{5}{{C}^{13}}+{{\,}_{1}}{{H}^{1}}\xrightarrow{{}}{{\,}_{6}}{{C}^{14}}\] done
clear
B)
\[_{7}{{N}^{14}}+{{\,}_{1}}{{H}^{1}}\xrightarrow{{}}{{\,}_{8}}{{O}^{15}}\] done
clear
C)
\[_{13}A{{l}^{27}}+{{\,}_{0}}{{n}^{1}}\xrightarrow{{}}{{\,}_{12}}M{{g}^{27}}+{{\,}_{1}}{{H}^{1}}\] done
clear
D)
\[_{92}{{U}^{235}}+{{\,}_{0}}{{n}^{1}}\xrightarrow{{}}{{\,}_{54}}X{{e}^{140}}+{{\,}_{38}}S{{r}^{93}}+3{{\,}_{0}}{{n}^{1}}\] done
clear
View Solution play_arrow
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question_answer32)
Which one of the following statements is incorrect [MP PET 1997]
A)
Mass defect is related with binding energy done
clear
B)
?Meson? was discovered by Yukawa done
clear
C)
The size of the nucleus is of the order of \[{{10}^{-12}}-{{10}^{-13}}cm\] done
clear
D)
Magnetic quantum number is a measure of ?orbital angular momentum? of the electron done
clear
View Solution play_arrow
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question_answer33)
In the sequence of following nuclear reactions \[_{92}{{X}^{238}}\xrightarrow{-\alpha }Y\xrightarrow{-\beta }Z\xrightarrow{-\beta }L{{\xrightarrow{-n\alpha }}_{84}}{{M}^{218}}\] The value of \[n\] will be [MP PMT 1999]
A)
3 done
clear
B)
4 done
clear
C)
5 done
clear
D)
6 done
clear
View Solution play_arrow
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question_answer34)
The introduction of a neutron into the nuclear composition of an atom would lead to a change in [MNR 1995]
A)
The number of the electrons also done
clear
B)
The chemical nature of the atom done
clear
C)
Its atomic number done
clear
D)
Its atomic weight done
clear
View Solution play_arrow
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question_answer35)
The composition of tritium (\[_{1}{{H}^{3}}\]) is [Manipal MEE 1995; DPMT 1982,96]
A)
1 electron, 1 proton, 1 neutron done
clear
B)
1 electron, 2 protons, 1 neutron done
clear
C)
1 electron, 1 proton, 2 neutrons done
clear
D)
1 electron, 1 proton, 3 neutrons done
clear
View Solution play_arrow
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question_answer36)
Identify \['X'\] in \[_{16}{{S}^{32}}+X\to {{\,}_{15}}{{P}^{30}}+{{\,}_{2}}H{{e}^{4}}\]
A)
\[_{1}{{H}^{1}}\] done
clear
B)
\[_{1}{{D}^{2}}\] done
clear
C)
\[_{0}{{n}^{1}}\] done
clear
D)
\[{{e}^{-}}\] done
clear
View Solution play_arrow
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question_answer37)
In terms of energy 1 a. m.u. is equal to [MP PET/PMT 1998]
A)
100 J done
clear
B)
931.1 MeV done
clear
C)
931.1 kcal done
clear
D)
\[{{10}^{7}}\]erg done
clear
View Solution play_arrow
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question_answer38)
Positron is [AIIMS 1997]
A)
Electron with +ve charge done
clear
B)
A helium nucleus done
clear
C)
A nucleus with two protons done
clear
D)
A nucleus with one neutron and one proton done
clear
View Solution play_arrow
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question_answer39)
\[X\xrightarrow{-\alpha }Y\xrightarrow{-\beta }Z\xrightarrow{-\beta }W\] In the above sequence of reaction, the elements which are isotopes of each other are [JIPMER 1997]
A)
\[X\] and \[W\] done
clear
B)
\[Y\] and \[Z\] done
clear
C)
\[X\] and \[Z\] done
clear
D)
None of these done
clear
View Solution play_arrow
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question_answer40)
Stable nuclides are those whose n/p ratio is [MP PMT 1993]
A)
\[n/p=1\] done
clear
B)
\[n/p=2\] done
clear
C)
\[n/p>1\] done
clear
D)
\[n/p<1\] done
clear
View Solution play_arrow
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question_answer41)
Neutrino has [NCERT 1981]
A)
Charge +1, mass 1 done
clear
B)
Charge 0, mass 0 done
clear
C)
Charge ? 1, mass 1 done
clear
D)
Charge 0 , mass 1 done
clear
View Solution play_arrow
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question_answer42)
Which one of the following nuclear reaction is correct [CPMT 1997]
A)
\[_{6}{{C}^{13}}{{+}_{1}}{{H}^{1}}{{\to }_{7}}{{N}^{13}}+{{\beta }^{-}}+{{v}^{-}}\] done
clear
B)
\[_{11}N{{a}^{23}}{{+}_{1}}{{H}^{1}}\to {{\ }_{10}}N{{e}^{20}}+{{\ }_{2}}H{{e}^{4}}\] done
clear
C)
\[_{13}A{{l}^{23}}+{{\ }_{0}}{{n}^{1}}\to {{\ }_{11}}N{{a}^{23}}+{{e}^{0}}\] done
clear
D)
None of these done
clear
View Solution play_arrow
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question_answer43)
Formation of nucleus from its nucleons is accompanied by [NCERT 1975; RPET 2000]
A)
Decrease in mass done
clear
B)
Increase in mass done
clear
C)
No change of mass done
clear
D)
None of them done
clear
View Solution play_arrow
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question_answer44)
A particle having the same charge and 200 times greater mass than that of electron is
A)
Positron done
clear
B)
Proton done
clear
C)
Neutrino done
clear
D)
Meson done
clear
View Solution play_arrow
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question_answer45)
The positron is [AFMC 1997]
A)
\[_{-1}{{e}^{0}}\] done
clear
B)
\[_{+1}{{e}^{0}}\] done
clear
C)
\[_{1}{{H}^{1}}\] done
clear
D)
\[_{0}{{n}^{1}}\] done
clear
View Solution play_arrow
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question_answer46)
Which of the following is the most stable atom [AFMC 1997]
A)
\[Bi\] done
clear
B)
\[Al\] done
clear
C)
\[U\] done
clear
D)
\[Pb\] done
clear
View Solution play_arrow
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question_answer47)
The positron is discovered by [RPMT 1997]
A)
Pauling done
clear
B)
Anderson done
clear
C)
Yukawa done
clear
D)
Segar done
clear
View Solution play_arrow
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question_answer48)
The nucleus of an atom is made up of X protons and Y neutrons. For the most stable and abundant nuclei [NCERT 1980]
A)
X and Y are both even done
clear
B)
X and Y are both odd done
clear
C)
X is even and Y is odd done
clear
D)
X is odd and Y is even done
clear
View Solution play_arrow
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question_answer49)
Atom A possesses higher values of packing fraction than atom B. The relative stabilities of A and B are
A)
A is more stable than B done
clear
B)
B is more stable than A done
clear
C)
A and B both are equally stable done
clear
D)
Stability does not depend on packing fraction done
clear
View Solution play_arrow
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question_answer50)
How many neutrons are present in the nucleus of \[Ra\] [CPMT 1980]
A)
88 done
clear
B)
226 done
clear
C)
140 done
clear
D)
138 done
clear
View Solution play_arrow
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question_answer51)
In a nuclear explosion, the energy is released in the form of [CPMT 1994]
A)
Kinetic energy done
clear
B)
Electrical energy done
clear
C)
Potential energy done
clear
D)
None of these done
clear
View Solution play_arrow
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question_answer52)
In equation \[_{11}N{{a}^{23}}{{+}_{1}}{{H}^{1}}{{\to }_{12}}M{{g}^{23}}+x\], \[x\] represents [MP PMT 1990; MP PET 1999]
A)
Neutron done
clear
B)
Deutron done
clear
C)
\[\alpha \]-particle done
clear
D)
Positron done
clear
View Solution play_arrow
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question_answer53)
Which of the following atomic mass of uranium is the most radioactive [AFMC 1997]
A)
238 done
clear
B)
235 done
clear
C)
226 done
clear
D)
248 done
clear
View Solution play_arrow
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question_answer54)
Which of the following particle is emitted in the reaction \[_{13}A{{l}^{27}}{{+}_{2}}H{{e}^{4}}{{\to }_{14}}{{P}^{30}}+.....\] [DCE 1999]
A)
\[_{0}{{n}^{1}}\] done
clear
B)
\[_{-1}{{e}^{0}}\] done
clear
C)
\[_{1}{{H}^{1}}\] done
clear
D)
\[_{1}{{H}^{2}}\] done
clear
View Solution play_arrow
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question_answer55)
Which of the following sub-atomic particles is not present in an atom [JIPMER 1999]
A)
Neutron done
clear
B)
Proton done
clear
C)
Electron done
clear
D)
Positron done
clear
View Solution play_arrow
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question_answer56)
Electromagnetic radiation with maximum wave length is [DCE 2000; UPSEAT 2000]
A)
Ultraviolet ray done
clear
B)
Radiowave done
clear
C)
X-ray done
clear
D)
Infrared done
clear
View Solution play_arrow
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question_answer57)
Neutrons are obtained by [JIPMER 1999]
A)
Bombardment of Ra with b-particles done
clear
B)
Bombardment of Be with a-particles done
clear
C)
Radioactive disintegration of uranium done
clear
D)
None of these done
clear
View Solution play_arrow
-
question_answer58)
In the reaction, \[Po\xrightarrow{-\alpha }Pb\xrightarrow{-\beta }Bi,\,\] if Bi, belongs to group 15, to which Po belongs [DCE 2000]
A)
14 done
clear
B)
15 done
clear
C)
13 done
clear
D)
16 done
clear
View Solution play_arrow
-
question_answer59)
In the nuclear reaction \[_{4}^{9}Be(p,\,\alpha )\,X,\] the X is [MP PMT 2000]
A)
\[_{2}^{4}He\] done
clear
B)
\[_{3}^{6}Li\] done
clear
C)
\[_{3}^{7}Li\] done
clear
D)
\[_{4}^{8}Be\] done
clear
View Solution play_arrow
-
question_answer60)
Which of the following does not contain number of neutrons equal to that of \[_{18}^{40}Ar\] [MP PMT 2000]
A)
\[_{19}^{41}K\] done
clear
B)
\[_{21}^{43}Sc\] done
clear
C)
\[_{21}^{40}Sc\] done
clear
D)
\[_{20}^{42}Ca\] done
clear
View Solution play_arrow
-
question_answer61)
Nuclear reactivity of Na and \[N{{a}^{+}}\] is same because both have [Pb. PMT 2000]
A)
Same electron and proton done
clear
B)
Same proton and same neutron done
clear
C)
Different electron and proton done
clear
D)
Different proton and neutron done
clear
View Solution play_arrow
-
question_answer62)
Which of the following is the heaviest metal [MH CET 2001]
A)
Hg done
clear
B)
Pb done
clear
C)
Ra done
clear
D)
U done
clear
View Solution play_arrow
-
question_answer63)
In the following reaction, \[x\] will be \[_{29}C{{u}^{64}}{{\to }_{28}}N{{i}^{64}}+x\]
A)
A proton done
clear
B)
An electron done
clear
C)
A neutron done
clear
D)
A positron done
clear
View Solution play_arrow
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question_answer64)
Which one out of the following statements is not correct for ortho and para hydrogen [Orissa JEE 2002]
A)
They have different boiling point done
clear
B)
Ortho form is more stable than para form done
clear
C)
They differ in the spin of their protons done
clear
D)
The ratio of ortho to para hydrogen increases with increase in temperature and finally pure ortho form is obtained done
clear
View Solution play_arrow
-
question_answer65)
For the nuclear reaction, \[_{12}^{24}Mg+{{\,}_{1}}{{D}^{2}}\to \alpha +?\], the missing nucleide is [Kurukshetra CEE 2002]
A)
\[_{11}^{22}Na\] done
clear
B)
\[_{11}^{23}Na\] done
clear
C)
\[_{12}^{23}Mg\] done
clear
D)
\[_{12}^{26}Mg\] done
clear
View Solution play_arrow
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question_answer66)
\[_{Z}{{X}^{M}}{{+}_{2}}H{{e}^{4}}{{\to }_{15}}{{P}^{30}}{{+}_{0}}{{n}^{1}}\]. Then [KCET 2002]
A)
\[Z=12,\,\,M=27\] done
clear
B)
\[Z=13,\,\,M=27\] done
clear
C)
\[Z=12,\,\,M=17\] done
clear
D)
\[Z=13,\,\,M=28\] done
clear
View Solution play_arrow
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question_answer67)
An element \[_{96}{{X}^{227}}\] emits \[4\alpha \] and \[5\beta \] particles to form new element Y. Then atomic number and mass number of Y are [MH CET 2002]
A)
93; 211 done
clear
B)
211; 93 done
clear
C)
212; 88 done
clear
D)
88; 211 done
clear
View Solution play_arrow
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question_answer68)
Meson was discovered [MH CET 2004]
A)
Yukawa done
clear
B)
Austin done
clear
C)
Moseley done
clear
D)
Einstein done
clear
View Solution play_arrow