-
question_answer1)
\[_{95}A{{m}^{241}}\] and \[_{90}T{{h}^{234}}\] belong respectively to [MP PMT 1999]
A)
\[4n\] and \[4n+1\] radioactive disintegration series done
clear
B)
\[4n+1\] and \[4n+2\] radioactive disintegration series done
clear
C)
\[4n+1\] and \[4n+3\] radioactive disintegration series done
clear
D)
\[4n+1\] and \[4n\] radioactive disintegration series done
clear
View Solution play_arrow
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question_answer2)
Group displacement law states that the emission of \[\alpha \] or \[\beta \] particles results in the daughter element occupying a position, in the periodic table, either to the left or right of that of the parent element. Which one of the following alternatives gives the correct position of the daughter element
A)
On emission of \[\alpha \] particles -2 groups to the right On emission of \[\beta \] particles-1 group to the right done
clear
B)
On emission of \[\alpha \] particles -2 groups to the right On emission of \[\beta \] particles-1 group to the left done
clear
C)
On emission of \[\alpha \] particles - 2 groups to the left On emission of \[\beta \] particles-1 group to the left done
clear
D)
On emission of \[\alpha \] particles -2 groups to the left On emission of \[\beta \] particles-1 group to the right done
clear
View Solution play_arrow
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question_answer3)
The nuclides (A nuclide is the general name for any nuclear species) \[_{6}{{C}^{12}}{{,}_{26}}F{{e}^{56}}\] and \[_{92}{{U}^{238}}\] have 12, 56 and 238 nucleons respectively in the nuclei. The total number of nucleons in a nucleus is equal to [NCERT 1975]
A)
The total number of neutrons in the nucleus done
clear
B)
The total number of neutrons in the atom done
clear
C)
The total number of protons in the nucleus done
clear
D)
The total number of protons and neutrons in the nucleus done
clear
View Solution play_arrow
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question_answer4)
Radioactivity is due to [DPMT 1983, 89; AIIMS 1988]
A)
Stable electronic configuration done
clear
B)
Unstable electronic configuration done
clear
C)
Stable nucleus done
clear
D)
Unstable nucleus done
clear
View Solution play_arrow
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question_answer5)
Radioactive disintegration differs from a chemical change in being [MNR 1991]
A)
An exothermic change done
clear
B)
A spontaneous process done
clear
C)
A nuclear process done
clear
D)
A unimolecular first order reaction done
clear
View Solution play_arrow
-
question_answer6)
\[_{92}^{238}U\] emits 8 a-particles and 6 b-particles. The neutron/proton ratio in the product nucleus is [AIIMS 2005]
A)
60/41 done
clear
B)
61/40 done
clear
C)
62/41 done
clear
D)
61/42 done
clear
View Solution play_arrow
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question_answer7)
The element with atomic number 84 and mass number 218 change to other element with atomic number 84 and mass number 214. The number of \[\alpha \] and \[\beta \]-particles emitted are respectively [CPMT 1989]
A)
1, 3 done
clear
B)
1, 4 done
clear
C)
1, 2 done
clear
D)
1, 5 done
clear
View Solution play_arrow
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question_answer8)
A radium \[_{88}R{{a}^{224}}\] isotope, on emission of an \[\alpha \]-particle gives rise to a new element whose mass number and atomic number will be [CPMT 1980; EAMCET 1985; MP PMT 1993]
A)
220 and 86 done
clear
B)
225 and 87 done
clear
C)
228 and 88 done
clear
D)
224 and 86 done
clear
View Solution play_arrow
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question_answer9)
\[_{89}A{{c}^{231}}\] gives \[_{82}P{{b}^{207}}\] after emission of some \[\alpha \]and \[\beta \]-particles. The number of such \[\alpha \] and \[\beta \]-particles are respectively [MP PMT 1993; UPSEAT 2001]
A)
5, 6 done
clear
B)
6, 5 done
clear
C)
7, 5 done
clear
D)
5, 7 done
clear
View Solution play_arrow
-
question_answer10)
The number of \[\alpha \] and \[\beta \]- particles emitted in the nuclear reaction \[_{90}T{{h}^{228}}{{\to }_{83}}B{{i}^{212}}\] are respectively [MNR 1992; MP PMT 1993; AFMC 1998, 2001; MH CET 1999; UPSEAT 2000, 01; AMU 2001; CPMT 2002]
A)
4, 1 done
clear
B)
3, 7 done
clear
C)
8, 1 done
clear
D)
4, 7 done
clear
View Solution play_arrow
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question_answer11)
The number of neutrons in the parent nucleus which gives \[{{N}^{14}}\] on \[\beta \]-emission and the parent nucleus is [EAMCET 1985; MNR 1992; Kurukshetra CEE 1998; UPSEAT 2000, 01]
A)
\[8,\,{{C}^{14}}\] done
clear
B)
\[6,\,{{C}^{12}}\] done
clear
C)
\[4,\,{{C}^{13}}\] done
clear
D)
None of these done
clear
View Solution play_arrow
-
question_answer12)
After the emission of \[\alpha \]-particle from the atom \[_{92}{{X}^{238}}\], the number of neutrons in the atom will be [MNR 1993; UPSEAT 1999, 2001, 02]
A)
138 done
clear
B)
140 done
clear
C)
144 done
clear
D)
150 done
clear
View Solution play_arrow
-
question_answer13)
When a radioactive element emits an electron the daughter element formed will have [EAMCET 1988; MP PET 1994]
A)
Mass number one unit less done
clear
B)
Atomic number one unit less done
clear
C)
Mass number one unit more done
clear
D)
Atomic number one unit more done
clear
View Solution play_arrow
-
question_answer14)
If the amount of radioactive substance is increased three times, the number of atoms disintegrated per unit time would [MP PMT 1994]
A)
Be double done
clear
B)
Be triple done
clear
C)
Remain one third done
clear
D)
Not change done
clear
View Solution play_arrow
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question_answer15)
\[\beta \]-particles are emitted from the atom
A)
Due to disintegration of neutron done
clear
B)
Due to disintegration of proton done
clear
C)
Due to removal of electron from \[K\] shell done
clear
D)
Due to removal of electron from outermost orbit done
clear
View Solution play_arrow
-
question_answer16)
\[Nd\,(Z=60)\] is a member of group -3 in periodic table. An isotope of it is \[\beta \]-active. The daughter nuclei will be a member of
A)
Group -3 done
clear
B)
Group - 4 done
clear
C)
Group -1 done
clear
D)
Group ? 2 done
clear
View Solution play_arrow
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question_answer17)
Number of neutrons in a parent nucleus \[X\], which gives \[_{7}{{N}^{14}}\] nucleus after two successive \[\beta \] emissions would be [CBSE PMT 1998; MP PMT 2003]
A)
9 done
clear
B)
8 done
clear
C)
7 done
clear
D)
6 done
clear
View Solution play_arrow
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question_answer18)
The disintegration of an isotope of sodium. \[_{11}N{{a}^{24}}{{\to }_{12}}M{{g}^{24}}{{+}_{-1}}{{e}^{0}}\] shown is due to [AMU (Engg.) 2000]
A)
The emission of b-radiation done
clear
B)
The formation of a stable nuclide done
clear
C)
The fall in the neutron : proton ratio done
clear
D)
None of these done
clear
View Solution play_arrow
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question_answer19)
After losing a number of a and b-particles. \[_{92}{{U}^{238}}\] is changed to \[_{82}P{{b}^{206}}\]. The total number of a-particles lost in this process is [UPSEAT 1999, 2000]
A)
10 done
clear
B)
5 done
clear
C)
8 done
clear
D)
32 done
clear
View Solution play_arrow
-
question_answer20)
Which element is the end product of each natural radioactive series [MP PMT 1996; MP PET/PMT 1998]
A)
\[Sn\] done
clear
B)
\[Bi\] done
clear
C)
\[Pb\] done
clear
D)
\[C\] done
clear
View Solution play_arrow
-
question_answer21)
\[_{13}^{27}Al\] is a stable isotope. \[_{13}^{29}Al\] is expected to disintegrate by [IIT 1996; UPSEAT 2001]
A)
\[\alpha \]-emission done
clear
B)
\[\beta \]-emission done
clear
C)
Positron emission done
clear
D)
Proton emission done
clear
View Solution play_arrow
-
question_answer22)
An isotope \[_{Y}{{A}^{X}}\] undergoes a series of \[m\] alpha and \[n\] beta disintegration to form a stable isotope \[_{Y-10}{{B}^{X-32}}\]. The values of \[m\] and \[n\] are respectively [MP PET 1995]
A)
6 and 8 done
clear
B)
8 and 10 done
clear
C)
5 and 8 done
clear
D)
8 and 6 done
clear
View Solution play_arrow
-
question_answer23)
During a \[\beta \]-decay the mass of the atomic nucleus [MP PET 1996]
A)
Decreases by one unit done
clear
B)
Increases by one unit done
clear
C)
Decreases by two units done
clear
D)
Remains unaffected done
clear
View Solution play_arrow
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question_answer24)
Which one of the following notations shows the product incorrectly [MP PET/PMT 1998]
A)
\[_{96}^{242}Cm\,(\alpha ,\,2n)\,_{97}^{243}Bk\] done
clear
B)
\[_{5}^{10}B\,(\alpha ,\,n)\,_{7}^{13}N\] done
clear
C)
\[_{7}^{14}N\,(n,\,p)\,_{6}^{14}C\] done
clear
D)
\[_{14}^{28}Si\,(d,\,n)\,_{15}^{29}P\] done
clear
View Solution play_arrow
-
question_answer25)
An atom has mass number 232 and atomic number 90. How many \[\alpha \]-particles should it emit after emission of two \[\beta \]-particles, so that the new element's atom has mass number 212 and atomic number 82
A)
4 done
clear
B)
5 done
clear
C)
6 done
clear
D)
3 done
clear
View Solution play_arrow
-
question_answer26)
After the emission of one \[\alpha \]-particle followed by one \[\beta -\]particle from the atom of \[_{92}{{X}^{238}}\], the number of neutrons in the atom will be [CBSE PMT 1995]
A)
142 done
clear
B)
146 done
clear
C)
144 done
clear
D)
143 done
clear
View Solution play_arrow
-
question_answer27)
A nuclide of an alkaline earth metal undergoes radioactive decay by emission of the \[\alpha -\]particles in succession. The group of the periodic table to which the resulting daughter element would belong is [CBSE PMT 2005]
A)
Gr.14 done
clear
B)
Gr.16 done
clear
C)
Gr.4 done
clear
D)
Gr.6 done
clear
View Solution play_arrow
-
question_answer28)
Which one of the following is not correct [MP PMT 1997]
A)
\[_{3}L{{i}^{7}}+{{\,}_{1}}{{H}^{1}}\to {{\,}_{4}}B{{e}^{7}}+{{\,}_{0}}{{n}^{1}}\] done
clear
B)
\[_{21}S{{c}^{45}}+{{\,}_{0}}{{n}^{1}}\to {{\,}_{20}}C{{a}^{45}}+{{\,}_{0}}{{n}^{1}}\] done
clear
C)
\[_{33}A{{s}^{75}}+{{\,}_{2}}H{{e}^{4}}\to {{\,}_{35}}B{{r}^{78}}+{{\,}_{0}}{{n}^{1}}\] done
clear
D)
\[_{83}B{{i}^{209}}+{{\,}_{1}}{{H}^{2}}\to {{\,}_{84}}P{{o}^{210}}+{{\,}_{0}}{{n}^{1}}\] done
clear
View Solution play_arrow
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question_answer29)
The end product of \[(4n+2)\] radioactive disintegration series is [MP PET 1997; Pb. PMT 1998; BHU 2000]
A)
\[_{82}P{{b}^{208}}\] done
clear
B)
\[_{82}P{{b}^{206}}\] done
clear
C)
\[_{82}P{{b}^{207}}\] done
clear
D)
\[_{83}B{{i}^{210}}\] done
clear
View Solution play_arrow
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question_answer30)
The element 90Th232 belongs to thorium series. Which of the following will act as the end product of the series [BHU 2005]
A)
82Pb208 done
clear
B)
82Bi209 done
clear
C)
82Pb206 done
clear
D)
82Pb207 done
clear
View Solution play_arrow
-
question_answer31)
On bombarding \[_{8}{{O}^{16}}\] with deutrons, the nuclei of the product formed will be [NCERT 1978]
A)
\[_{9}{{F}^{18}}\] done
clear
B)
\[_{9}{{F}^{17}}\] done
clear
C)
\[_{8}{{O}^{17}}\] done
clear
D)
\[_{7}{{N}^{14}}\] done
clear
View Solution play_arrow
-
question_answer32)
An element with atomic number 84 and mass number 218 loses one \[\alpha \]-particle and two \[\beta \]-particles in three successive stages, the resulting element will have [NCERT 1979; CPMT 1990]
A)
At. no. 84 and mass number 214 done
clear
B)
At. no. 82 and mass number 214 done
clear
C)
At. no. 84 and mass number 218 done
clear
D)
At. no. 82 and mass number 218 done
clear
View Solution play_arrow
-
question_answer33)
Group displacement law was given by [DPMT 1984]
A)
Becquerel done
clear
B)
Rutherford done
clear
C)
Soddy and Fajan done
clear
D)
Madam Curie done
clear
View Solution play_arrow
-
question_answer34)
How many alpha particles are emitted in the nuclear transformation \[_{84}P{{o}^{215}}{{\xrightarrow{{}}}_{82}}P{{b}^{211}}\] [CPMT 1993]
A)
0 done
clear
B)
1 done
clear
C)
2 done
clear
D)
3 done
clear
View Solution play_arrow
-
question_answer35)
If uranium (mass no. 238 and atomic no. 92) emits \[\alpha \]-particle, the product has mass number and atomic number [CPMT 1984, 90, 93, 94; MNR 1991; IIT 1981]
A)
234, 90 done
clear
B)
236, 92 done
clear
C)
238, 90 done
clear
D)
236, 90 done
clear
View Solution play_arrow
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question_answer36)
Initial mass of a radioactive element is 40 g. How many grams of it would be left after 24 years, if its half-life period is 8 years [MP PMT 1985]
A)
2 done
clear
B)
5 done
clear
C)
10 done
clear
D)
20 done
clear
View Solution play_arrow
-
question_answer37)
What is the symbol for the nucleus remaining after \[_{20}C{{a}^{42}}\] undergoes \[\beta \]-emission [MNR 1987; UPSEAT 2000, 02]
A)
\[_{21}C{{a}^{42}}\] done
clear
B)
\[_{20}S{{c}^{42}}\] done
clear
C)
\[_{21}S{{c}^{42}}\] done
clear
D)
\[_{21}S{{c}^{41}}\] done
clear
View Solution play_arrow
-
question_answer38)
When a radioactive nucleus emits an \[\alpha \]-particle, the mass of the atom [NCERT 1973, 82]
A)
Increases and its at. number decreases done
clear
B)
Decreases and its at. number decreases done
clear
C)
Decreases and its at. number increases done
clear
D)
Remains same and its at. number decreases done
clear
View Solution play_arrow
-
question_answer39)
A photon of hard gamma radiation knocks a proton out of \[_{12}^{24}Mg\] nucleus to form [AIEEE 2005]
A)
The isotope of parent nucleus done
clear
B)
The isobar of parent nucleus done
clear
C)
The nuclide \[_{11}^{23}Na\] done
clear
D)
The isobar of \[_{11}^{23}Na\] done
clear
View Solution play_arrow
-
question_answer40)
\[_{84}P{{b}^{210}}{{\xrightarrow{{}}}_{82}}P{{b}^{206}}{{+}_{2}}H{{e}^{4}}\]. From the above equation, deduce the position of polonium in the periodic table (lead belongs to group IV A) [AIIMS 1980]
A)
II A done
clear
B)
IV B done
clear
C)
VI B done
clear
D)
VI A done
clear
View Solution play_arrow
-
question_answer41)
Whenever the parent nucleus emits a b-particle, the daughter element is shifted in the periodic table [NCERT 1984]
A)
One place to the right done
clear
B)
One place to the left done
clear
C)
Two places to the right done
clear
D)
Two places to the left done
clear
View Solution play_arrow
-
question_answer42)
In the nuclear reaction \[_{92}{{U}^{238}}{{\to }_{82}}P{{b}^{206}}\], the number of alpha and beta particles decayed are [DPMT 1983; MNR 1985; Roorkee Qualifying 1998]
A)
\[4\alpha ,\,3\beta \] done
clear
B)
\[8\alpha ,\,6\beta \] done
clear
C)
\[6\alpha ,\,4\beta \] done
clear
D)
\[7\alpha ,\,5\beta \] done
clear
View Solution play_arrow
-
question_answer43)
Atomic number after a \[\beta \]-emission from a nucleus having atomic number 40, will be [BHU 1981]
A)
36 done
clear
B)
39 done
clear
C)
41 done
clear
D)
44 done
clear
View Solution play_arrow
-
question_answer44)
A certain nuclide has a half-life period of 30 minutes. If a sample containing 600 atoms is allowed to decay for 90 minutes, how many atoms will remain [NCERT 1978]
A)
200 atoms done
clear
B)
450 atoms done
clear
C)
75 atoms done
clear
D)
500 atoms done
clear
View Solution play_arrow
-
question_answer45)
The reaction which disintegrates neutron is or neutron is emitted (which completes first) [IIT 1988; MP PMT 1991; KCET 2005]
A)
\[_{96}A{{m}^{240}}{{+}_{2}}H{{e}^{4}}\to {{}_{97}}B{{k}^{244}}+{{}_{+1}}{{e}^{0}}\] done
clear
B)
\[_{15}{{P}^{30}}\to {{\ }_{14}}S{{i}^{30}}+{{\ }_{1}}{{e}^{0}}\] done
clear
C)
\[_{6}{{C}^{12}}+{{\ }_{1}}{{H}^{1}}\to {{\ }_{7}}{{N}^{13}}\] done
clear
D)
\[_{13}A{{l}^{27}}+{{\ }_{2}}H{{e}^{4}}\to {{\ }_{15}}{{P}^{30}}\] done
clear
View Solution play_arrow
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question_answer46)
If \[_{92}{{U}^{236}}\] nucleus emits one \[\alpha \]-particle, the remaining nucleus will have [MP PMT 1976, 80; BHU 1985; CPMT 1980]
A)
119 neutrons and 119 protons done
clear
B)
142 neutrons and 90 protons done
clear
C)
144 neutrons and 92 protons done
clear
D)
146 neutrons and 90 protons done
clear
View Solution play_arrow
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question_answer47)
\[\alpha \]-rays have high ionization power because they possess [CPMT 1982]
A)
Lesser kinetic energy done
clear
B)
Higher kinetic energy done
clear
C)
Lesser penetrating power done
clear
D)
Higher penetrating power done
clear
View Solution play_arrow
-
question_answer48)
When radium atom which is placed in II group, loses an \[\alpha \]- particle, a new element is formed which should be placed in group [CPMT 1979, 80, 94; NCERT 1979, 82]
A)
Second done
clear
B)
First done
clear
C)
Fourth done
clear
D)
Zero done
clear
View Solution play_arrow
-
question_answer49)
Starting from radium, the radioactive disintegration process terminates when the following is obtained [CPMT 1979]
A)
Lead done
clear
B)
Radon done
clear
C)
Radium A done
clear
D)
Radium B done
clear
View Solution play_arrow
-
question_answer50)
The appreciable radioactivity of uranium minerals is mainly due to [NCERT 1980]
A)
An uranium isotope of mass number 235 done
clear
B)
A thorium isotope of mass number 232 done
clear
C)
Actinium done
clear
D)
Radium done
clear
View Solution play_arrow
-
question_answer51)
After losing a number of \[\alpha \]and \[\beta \]-particles, \[_{92}{{U}^{238}}\] changed to \[_{82}P{{b}^{206}}\]. The total number of particles lost in this process is [MNR 1985]
A)
14 done
clear
B)
5 done
clear
C)
8 done
clear
D)
32 done
clear
View Solution play_arrow
-
question_answer52)
When an radioactive element emits an alpha particle, the daughter element is placed in the periodic table [MP PET 1991; MADT Bihar 1981]
A)
Two positions to the left of the parent element done
clear
B)
Two positions to the right of the parent element done
clear
C)
One position to the right of the parent element done
clear
D)
In the same position as the parent element done
clear
View Solution play_arrow
-
question_answer53)
If the quantity of a radioactive element is doubled, then its rate of disintegration per unit time will be [NCERT 1972, 92; MP PET 1989]
A)
Unchanged done
clear
B)
Reduced to half done
clear
C)
Increased by \[\sqrt{2}\]times done
clear
D)
Doubled done
clear
View Solution play_arrow
-
question_answer54)
The number of a and b -particles emitted during the transformation of \[_{90}T{{h}^{232}}\] to \[_{82}{{P}^{208}}\] are respectively [MNR 1978; NCERT 1984;CPMT 1989; RPET 1999; MP PMT 2001; KCET 2003]
A)
4, 2 done
clear
B)
2, 2 done
clear
C)
8, 6 done
clear
D)
6, 4 done
clear
View Solution play_arrow
-
question_answer55)
The atomic number of a radioactive element increases by one unit in [EAMCET 1997]
A)
Alpha emission done
clear
B)
Beta emission done
clear
C)
Gamma emission done
clear
D)
Electron capture done
clear
View Solution play_arrow
-
question_answer56)
The end product of \[(4n+1)\] radioactive disintegration series is [MP PMT 1999]
A)
\[_{83}B{{i}^{209}}\] done
clear
B)
\[_{84}P{{o}^{210}}\] done
clear
C)
\[_{82}P{{b}^{208}}\] done
clear
D)
\[_{82}P{{b}^{207}}\] done
clear
View Solution play_arrow
-
question_answer57)
When a \[\beta \]-particle emits from the atom of an element, then [MP PET 1990]
A)
Atomic number increases by two units done
clear
B)
Atomic number increases by three units done
clear
C)
Atomic number decreases by one unit done
clear
D)
Atomic number increases by one unit done
clear
View Solution play_arrow
-
question_answer58)
The number of b-particles emitted in radioactive change \[_{92}{{U}^{238}}{{\to }_{82}}P{{b}^{206}}{{+}_{2}}H{{e}^{4}}\] is [KCET 2000]
A)
2 done
clear
B)
4 done
clear
C)
6 done
clear
D)
10 done
clear
View Solution play_arrow
-
question_answer59)
If half-life of a certain radioactive nucleus is \[1000\,s,\] the disintegration constant is [MP PET 2001]
A)
\[6.93\times {{10}^{2}}{{s}^{-1}}\] done
clear
B)
\[6.93\times {{10}^{-4}}s\] done
clear
C)
\[6.93\times {{10}^{-4}}{{s}^{-1}}\] done
clear
D)
\[6.93\times {{10}^{3}}s\] done
clear
View Solution play_arrow
-
question_answer60)
Radioactivity of naptunium stops when it is converted to [JIPMER 2001]
A)
Bi done
clear
B)
Rn done
clear
C)
Th done
clear
D)
Pb done
clear
View Solution play_arrow
-
question_answer61)
The highest binding energy per nucleon will be for [AIIMS 2001]
A)
Fe done
clear
B)
\[{{H}_{2}}\] done
clear
C)
\[{{O}_{2}}\] done
clear
D)
U done
clear
View Solution play_arrow
-
question_answer62)
In the Thorium series, \[_{90}Th{{}^{232}}\] loses total of 6 a-particles and 4 b-particles in ten stages. The final isotope produced in the series is [MP PET 2001]
A)
\[_{82}P{{b}^{209}}\] done
clear
B)
\[_{83}B{{i}^{209}}\] done
clear
C)
\[_{82}P{{b}^{208}}\] done
clear
D)
\[_{82}P{{b}^{206}}\] done
clear
View Solution play_arrow
-
question_answer63)
All the nuclei from the initial element to the final element constitute a series which is called [Kerala (Med.) 2002]
A)
g-series done
clear
B)
b-series done
clear
C)
b-g series done
clear
D)
Disintegration series done
clear
View Solution play_arrow
-
question_answer64)
The number of neutrons in the parent nucleus which gives \[{{N}^{14}}\] on b ? emission is [Pb.CET 2004]
A)
7 done
clear
B)
14 done
clear
C)
6 done
clear
D)
8 done
clear
View Solution play_arrow
-
question_answer65)
The nuclear binding energy for \[Ar\](39.962384 amu) is: (given mass of proton and neutron are 1.007825 amu and 1.008665 amu respectively) [Pb.CET 2002]
A)
\[343.81\ MeV\] done
clear
B)
\[0.369096\ MeV\] done
clear
C)
\[931\ MeV\] done
clear
D)
None of these done
clear
View Solution play_arrow
-
question_answer66)
The number \[\alpha -\]and \[\beta \]- particles emitted respectively during the transformation of \[_{90}^{232}Th\ \text{to}\ _{82}^{208}Pb\]is [Kerala PMT 2004]
A)
3, 6 done
clear
B)
6, 3 done
clear
C)
4, 6 done
clear
D)
6, 4 done
clear
E)
6, 8 done
clear
View Solution play_arrow
-
question_answer67)
Consider the following nuclear reactions, \[_{92}^{238}M\to \,_{y}^{x}N+2\,_{2}^{4}He\] \[_{y}^{x}N\to \,_{B}^{A}L+2{{\beta }^{+}}\] The number of neutrons in the element L is [AIEEE 2004]
A)
140 done
clear
B)
144 done
clear
C)
142 done
clear
D)
146 done
clear
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question_answer68)
The number of \[\alpha -\]and \[\beta -\]particles emitted when a radioactive element \[_{90}{{E}^{232}}\] changes into \[_{86}{{G}^{220}}\] will be [MP PET 2004]
A)
5 and 4 done
clear
B)
2 and 3 done
clear
C)
3 and 2 done
clear
D)
4 and 1 done
clear
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question_answer69)
The disintegration constant of radium with half-life 1600 years is [MHCET 2004]
A)
\[2.12\times {{10}^{-4}}yea{{r}^{-1}}\] done
clear
B)
\[4.33\times {{10}^{-4}}yea{{r}^{-1}}\] done
clear
C)
\[3.26\times {{10}^{-3}}yea{{r}^{-1}}\] done
clear
D)
\[4.33\times {{10}^{-12}}yea{{r}^{-1}}\] done
clear
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question_answer70)
The number of \[\alpha \] and \[\beta -\]particles emitted in the nuclear reaction \[_{92}{{U}^{238}}{{\to }_{90}}T{{h}^{234}}{{\to }_{91}}P{{a}^{234}}\]are respectively [Pb.CET 2001]
A)
1 and 1 done
clear
B)
1 and 2 done
clear
C)
2 and 1 done
clear
D)
2 and 2 done
clear
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question_answer71)
In which radiation mass number and atomic number will not change [JEE Orissa 2004]
A)
\[\alpha \] done
clear
B)
\[\beta \] done
clear
C)
\[\gamma \] done
clear
D)
\[\alpha \] and \[2\beta \] done
clear
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question_answer72)
Disintegration constant for a radioactive substance is 0.58\[h{{r}^{-1}}\]. Its half-life period [BHU 2004]
A)
8.2 hr done
clear
B)
5.2 hr done
clear
C)
1.2 hr done
clear
D)
2.4 hr done
clear
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question_answer73)
A radioactive nucleus will not emit [DPMT 2005]
A)
Alpha and beta rays simultaneously done
clear
B)
Beta and gamma rays simultaneously done
clear
C)
Gamma and alpha rays done
clear
D)
Gamma rays only done
clear
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question_answer74)
\[_{72}^{180}X\xrightarrow{2\alpha }\xrightarrow{\beta }\xrightarrow{\gamma }\,_{Z}^{A}{X}'\].\[Z\] and \[A\]are [DPMT 2005]
A)
69, 172 done
clear
B)
172, 69 done
clear
C)
180, 70 done
clear
D)
182, 68 done
clear
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question_answer75)
Loss of a beta particle is equivalent to [J & K 2005]
A)
Increase of one neutron only done
clear
B)
Decrease of one neutron only done
clear
C)
Both A and B done
clear
D)
None of these done
clear
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