-
question_answer1)
The age of most ancient geological formation is estimated by [NCERT 1981; MP PET/PMT 1988; CBSE 1989; MP PET 1997; MP PMT 2002]
A)
Potassium ? Argon method done
clear
B)
Carbon ? 14 dating method done
clear
C)
Radium ? Silicon method done
clear
D)
Uranium ? Lead method done
clear
View Solution play_arrow
-
question_answer2)
The equation \[_{3}L{{i}^{6}}{{+}_{1}}{{H}^{2}}\xrightarrow{{}}{{2}_{2}}H{{e}^{4}}+\] energy represents
A)
Synthesis of helium done
clear
B)
Transmutation of element done
clear
C)
Fusion reaction done
clear
D)
Nuclear fission done
clear
View Solution play_arrow
-
question_answer3)
The phenomenon of radioactivity arises from the [Kerala (Med.) 2002]
A)
Binary fission done
clear
B)
Nuclear fusion done
clear
C)
Stable nuclei done
clear
D)
Decay of unstable nuclei done
clear
View Solution play_arrow
-
question_answer4)
The first artificial disintegration of an atomic nucleus was achieved by [Kerala (Engg.) 2002]
A)
Geiger done
clear
B)
Wilson done
clear
C)
Madame curie done
clear
D)
Rutherford done
clear
E)
Soddy done
clear
View Solution play_arrow
-
question_answer5)
Artificial elements have been prepared by bombardment reactions in high energy accelerators. What is the mass number of the element X produced in the following nuclear reaction \[_{95}^{249}Cf+_{7}^{15}N{{\to }_{105}}X+4_{0}^{1}n\] [AMU (Engg.) 2002]
A)
261 done
clear
B)
264 done
clear
C)
260 done
clear
D)
257 done
clear
View Solution play_arrow
-
question_answer6)
Radioactive carbon dating was discovered by [MP PET 2001]
A)
W.F. Libby done
clear
B)
G.N. Lewis done
clear
C)
J. Willard Gibbs done
clear
D)
W. Nernst done
clear
View Solution play_arrow
-
question_answer7)
The nuclear reaction \[_{29}^{63}Cu+_{2}^{4}He\to _{17}^{37}Cl+14_{1}^{1}H+16_{0}^{1}n\] is referred to as [MP PET 2002]
A)
Spallation reaction done
clear
B)
Fusion reaction done
clear
C)
Fission reaction done
clear
D)
Chain reaction done
clear
View Solution play_arrow
-
question_answer8)
The carbon dating is based on [MP PMT 2001]
A)
\[_{6}^{15}C\] done
clear
B)
\[_{6}^{14}C\] done
clear
C)
\[_{6}^{13}C\] done
clear
D)
\[_{6}^{11}C\] done
clear
View Solution play_arrow
-
question_answer9)
A possible material for use in the nuclear reactors as a fuel is [DPMT 1986]
A)
Thorium done
clear
B)
Zirconium done
clear
C)
Beryllium done
clear
D)
Plutonium done
clear
View Solution play_arrow
-
question_answer10)
Heavy water freezes at [UPSEAT 2001]
A)
\[0{}^\circ C\] done
clear
B)
\[3.8{}^\circ C\] done
clear
C)
\[38{}^\circ C\] done
clear
D)
\[-\,0.38{}^\circ C\] done
clear
View Solution play_arrow
-
question_answer11)
To determine the masses of the isotopes of an element which of the following techniques is useful [NCERT 1978; MNR 1979]
A)
The acceleration of charged atoms by an electric field and their subsequent deflection by a variable magnetic field done
clear
B)
The spectroscopic examination of the light emitted by vaporised elements subjected to electric discharge done
clear
C)
The photographing of the diffraction patterns which arise when X-rays are passed through crystals done
clear
D)
The bombardment of metal foil with alpha particles done
clear
View Solution play_arrow
-
question_answer12)
The radioisotope, tritium \[(_{1}^{3}H)\] has a half-life of 12.3 years. If the initial amount of tritium is 32 mg. How many milligrams of it would remain after 49.2 years [CBSE 2003]
A)
8 mg done
clear
B)
1 mg done
clear
C)
2 mg done
clear
D)
4 mg done
clear
View Solution play_arrow
-
question_answer13)
Neutron is used as a [CPMT 1988]
A)
Reducing agent done
clear
B)
Moderator done
clear
C)
Tracer done
clear
D)
In biological programmer done
clear
View Solution play_arrow
-
question_answer14)
Hydrogen bomb is based on the phenomenon of [EAMCET 1980; CPMT 1984, 96; MP PMT 1993, 95, 2002; RPET 1999]
A)
Nuclear fission done
clear
B)
Nuclear fusion done
clear
C)
Nuclear explosion done
clear
D)
Disintegration done
clear
View Solution play_arrow
-
question_answer15)
In the nuclear reactors the speed of the neutrons is slowed down by [CPMT 1983, 84]
A)
Heavy water done
clear
B)
Ordinary water done
clear
C)
Zinc rods done
clear
D)
Molten caustic soda done
clear
View Solution play_arrow
-
question_answer16)
By which law, energy produced in nuclear reaction is given [MP PET 2000]
A)
Graham?s law done
clear
B)
Charle?s law done
clear
C)
Gas Lussac?s Law done
clear
D)
Einstein?s law done
clear
View Solution play_arrow
-
question_answer17)
If two light nuclei are fused together in nuclear reaction the average energy per nucleon [Pb. PMT 2001]
A)
Increases done
clear
B)
Cannot be determined done
clear
C)
Remains same done
clear
D)
Decreases done
clear
View Solution play_arrow
-
question_answer18)
A wood piece is 11460 years old. What is the fraction of \[^{14}C\] activity left in the piece? (Half-life period of \[^{14}C\] is 5730 years) [MP PMT 2000]
A)
0.12 done
clear
B)
0.25 done
clear
C)
0.50 done
clear
D)
0.75 done
clear
View Solution play_arrow
-
question_answer19)
When nuclear energy is intended to be harnessed for generation of electricity, potentially destructive neutron released in a nuclear reactor are absorbed by [MH CET 2001]
A)
Long rods of Cd done
clear
B)
Heavy water done
clear
C)
Cubical blocks of steel done
clear
D)
Both A and C done
clear
View Solution play_arrow
-
question_answer20)
The proper rays for radiocarbon dating are [MP PET 2002]
A)
UV-rays done
clear
B)
IR-rays done
clear
C)
Cosmic rays done
clear
D)
X-rays done
clear
View Solution play_arrow
-
question_answer21)
\[_{1}{{H}^{2}}+{{\,}_{1}}{{H}^{2}}\to {{\,}_{2}}H{{e}^{3}}+{{\,}_{0}}{{n}^{1}}\]. Above nuclear reaction is called [UPSEAT 2001]
A)
Nuclear fission done
clear
B)
Nuclear fusion done
clear
C)
Artificial transmutation done
clear
D)
Spontaneous disintegration done
clear
View Solution play_arrow
-
question_answer22)
Which of the following is used as a moderator in a nuclear reactor [AIIMS 2001]
A)
\[{{D}_{2}}O\] done
clear
B)
\[{{N}_{2}}O\] done
clear
C)
\[{{H}_{2}}O\] done
clear
D)
\[NaOH\] done
clear
View Solution play_arrow
-
question_answer23)
The fuel of atomic pile is [NCERT 1973; AFMC 1989]
A)
Thorium done
clear
B)
Sodium done
clear
C)
Uranium done
clear
D)
Petroleum done
clear
View Solution play_arrow
-
question_answer24)
Atom bomb is based on the principle of [CPMT 1982; BHU 1985]
A)
Nuclear fusion done
clear
B)
Nuclear fission done
clear
C)
Radioactivity done
clear
D)
Fusion and fission both done
clear
View Solution play_arrow
-
question_answer25)
Who observed that when the nucleus of uranium atom was bombarded with fast moving neutrons, it becomes so very unstable that it is immediately broken into two nuclei of nearly equal mass besides other fragments
A)
J.J. Thomson done
clear
B)
Chadwick done
clear
C)
Einstein done
clear
D)
Hahn and Strassmann done
clear
View Solution play_arrow
-
question_answer26)
When a radioactive substance is subjected to vacuum, the rate of disintegration per second [DPMT 1985; NCERT 1972]
A)
Increases considerably done
clear
B)
Increases only if the products are gaseous done
clear
C)
Is not affected done
clear
D)
Suffers a slight decrease done
clear
View Solution play_arrow
-
question_answer27)
A radio isotope will not emit [KCET 2002]
A)
Gamma and alpha rays simultaneously done
clear
B)
Gamma rays only done
clear
C)
Alpha and beta rays simultaneously done
clear
D)
Beta and gamma rays simultaneously done
clear
View Solution play_arrow
-
question_answer28)
What is the packing fraction of \[_{26}^{56}Fe\] (Isotopic mass = 55.92066) [JIPMER 2002]
A)
\[-14.167\] done
clear
B)
\[173.90\] done
clear
C)
\[-14.187\] done
clear
D)
\[-73.90\] done
clear
View Solution play_arrow
-
question_answer29)
The energy released in an atom bomb explosion is mainly due to [BVP 2003]
A)
Release of neutrons done
clear
B)
Release of electrons done
clear
C)
Greater mass of products than initial material done
clear
D)
Lesser mass of products than initial material done
clear
View Solution play_arrow
-
question_answer30)
\[{{C}^{14}}\] is [KCET 2002]
A)
A natural radioactive isotope done
clear
B)
A natural non-radioactive isotope done
clear
C)
An artificial radioactive isotope done
clear
D)
An artificial non-radioactive isotope done
clear
View Solution play_arrow
-
question_answer31)
A radioactive isotope has a half-life of 10 years. What percentage of the original amount of it remain after 20 years [KCET 2001]
A)
0 done
clear
B)
12.5 done
clear
C)
8 done
clear
D)
25 done
clear
View Solution play_arrow
-
question_answer32)
In a chain reaction, uranium atom gets fissioned forming two different materials. The total weight of these put together is [EAMCET 1986]
A)
More than the weight of parent uranium atom done
clear
B)
Less than the weight of parent uranium atom done
clear
C)
More or less depends upon experimental conditions done
clear
D)
Neither more nor less done
clear
View Solution play_arrow
-
question_answer33)
A substance used as a moderator in nuclear reactors is [MP PET 1995]
A)
Cadmium done
clear
B)
Uranium-235 done
clear
C)
Lead done
clear
D)
Heavy water done
clear
View Solution play_arrow
-
question_answer34)
Equation \[_{17}C{{l}^{37}}+{{\,}_{1}}{{H}^{2}}\to {{\,}_{18}}A{{r}^{38}}+{{\,}_{0}}{{n}^{1}}\] is [MP PMT 1989]
A)
Nuclear fission done
clear
B)
Nuclear fusion done
clear
C)
Transformation of chlorin done
clear
D)
Synthesis of argon done
clear
View Solution play_arrow
-
question_answer35)
\[1.0\,gm\] radioactive sodium on decay becomes \[0.25\,gm\] in 16 hours. How much time \[48\,gm\] of same radioactive sodium will need to become \[3.0\,gm\]
A)
48 hours done
clear
B)
32 hours done
clear
C)
20 hours done
clear
D)
16 hours done
clear
View Solution play_arrow
-
question_answer36)
Large energy released in an atomic bomb explosion is mainly due to [CPMT 1972, 73, 81, 90]
A)
Products having a lesser mass than initial substance done
clear
B)
Conversion of heavier to lighter atoms done
clear
C)
Release of neutrons done
clear
D)
Release of electrons done
clear
View Solution play_arrow
-
question_answer37)
The reaction \[_{1}{{H}^{2}}+{{\,}_{1}}{{H}^{3}}\to {{\,}_{2}}H{{e}^{4}}+{{\,}_{0}}{{n}^{1}}+\]energy represents [MP PMT 1990; CPMT 1990; KCET 1992]
A)
Nuclear fission done
clear
B)
Nuclear fusion done
clear
C)
Artificial disintegration done
clear
D)
Transmutation of element done
clear
View Solution play_arrow
-
question_answer38)
Carbon-14 dating method is based on the fact that [CBSE 1997]
A)
Carbon-14 fraction is the same in all objects done
clear
B)
Carbon-14 is highly insoluble done
clear
C)
Ratio of carbon-14 and carbon-12 is constant done
clear
D)
All of these done
clear
View Solution play_arrow
-
question_answer39)
Half-life period of a radioactive element is 10.6 yrs. How much time will it take in its 99% decomposition [RPET 1999]
A)
7046 yrs done
clear
B)
7.046 yrs done
clear
C)
704.6 yrs done
clear
D)
70.4 yrs done
clear
View Solution play_arrow
-
question_answer40)
Deuterium resembles hydrogen in chemical properties but reacts [JIPMER 2001]
A)
More vigorously than hydrogen done
clear
B)
Faster than hydrogen done
clear
C)
Slower than hydrogen done
clear
D)
Just as hydrogen done
clear
View Solution play_arrow
-
question_answer41)
Which of the following is heavy water [AFMC 1997]
A)
\[{{H}_{2}}{{O}_{18}}\] done
clear
B)
\[{{H}_{2}}{{O}_{16}}\] done
clear
C)
\[{{H}_{2}}{{O}_{3}}\] done
clear
D)
\[{{D}_{2}}O\] done
clear
View Solution play_arrow
-
question_answer42)
\[{{D}_{2}}O\] is used in [CPMT 1997]
A)
Industry done
clear
B)
Nuclear reactor done
clear
C)
Medicine done
clear
D)
Insecticide done
clear
View Solution play_arrow
-
question_answer43)
India conducted an underground nuclear test at [KCET 1998]
A)
Tarapur done
clear
B)
Narora done
clear
C)
Pokhran done
clear
D)
Pushkar done
clear
View Solution play_arrow
-
question_answer44)
Energy required to separate neutron and proton from the nucleus is called [RPMT 1999]
A)
Bond energy done
clear
B)
Nuclear energy done
clear
C)
Chemical energy done
clear
D)
Radiation energy done
clear
View Solution play_arrow
-
question_answer45)
Liquid sodium finds use in nuclear reactors. Its function is
A)
To collect the reaction products done
clear
B)
To act as a heat exchanger or coolant done
clear
C)
To absorb the neutrons in order to control the chain reaction done
clear
D)
To act as a moderator which slows down the neutrons done
clear
View Solution play_arrow
-
question_answer46)
Which is least effective for artificial transmutation [DPMT 2000]
A)
Deuterons done
clear
B)
Neutrons done
clear
C)
a-particles done
clear
D)
Protons done
clear
View Solution play_arrow
-
question_answer47)
A piece of wood was found to have \[{{C}^{14}}/{{C}^{12}}\] ratio 0.7 times that in a living plant. The time period when the plant died is (Half-life of \[{{C}^{14}}=5760\,yrs)\] [Pb. PMT 1999]
A)
2770 yrs done
clear
B)
2966 yrs done
clear
C)
2980 yrs done
clear
D)
3070 yrs done
clear
View Solution play_arrow
-
question_answer48)
When a slow neutron goes sufficiently close to a \[{{U}^{235}}\] nucleus, then the process which takes place is [AFMC 2000]
A)
Fusion of \[{{U}^{235}}\] done
clear
B)
Fission of \[{{U}^{235}}\] done
clear
C)
Fusion of neutron done
clear
D)
First A then B done
clear
View Solution play_arrow
-
question_answer49)
\[_{13}A{{l}^{28}}\] when radiated by suitable projectile gives \[_{15}{{P}^{31}}\] and neutron. The projectile used is [MP PMT/PET 1988; CPMT 1985, 82]
A)
Proton done
clear
B)
Neutron done
clear
C)
Alpha particle done
clear
D)
Deuteron done
clear
View Solution play_arrow
-
question_answer50)
Which of the following statements about radioactivity of an element is incorrect
A)
It is a nuclear property done
clear
B)
It does not involve any rearrangement of electrons done
clear
C)
Its rate is affected by change in temperature and/or pressure done
clear
D)
It remains unaffected by the presence of other element or elements chemically combined with it done
clear
View Solution play_arrow
-
question_answer51)
Radioactive iodine is being used to diagnose the disease of [MP PET 1996]
A)
Bones done
clear
B)
Kidneys done
clear
C)
Blood cancer done
clear
D)
Thyroid done
clear
View Solution play_arrow
-
question_answer52)
\[C-14\] is used in carbon dating of dead objects because [DPMT 1996]
A)
Its half-life is \[{{10}^{3}}\] years done
clear
B)
Its half-life is \[{{10}^{4}}\] years done
clear
C)
It is found in nature abundantly and in definite ratio done
clear
D)
It is found in dead animals abundantly done
clear
View Solution play_arrow
-
question_answer53)
A radioactive element resembling iodine in properties is [Kurukeshetra CEE 1998]
A)
Astatine done
clear
B)
Lead done
clear
C)
Radium done
clear
D)
Thorium done
clear
View Solution play_arrow
-
question_answer54)
For artificial transmutation of nuclei, the most effective one is [MP PMT 1996]
A)
Proton done
clear
B)
Deuteron done
clear
C)
Helium nuclei done
clear
D)
Neutron done
clear
View Solution play_arrow
-
question_answer55)
Which of the following cannot be accelerated [KCET 2005]
A)
\[\alpha \]-particle done
clear
B)
\[\beta \]-particle done
clear
C)
Protons done
clear
D)
Neutrons done
clear
View Solution play_arrow
-
question_answer56)
For the fission reaction \[_{92}{{U}^{235}}+{{\,}_{0}}{{n}^{1}}\to {{\,}_{56}}B{{a}^{140}}+{{\,}_{y}}{{E}^{x}}+2{{\,}_{0}}{{n}^{1}}\] The value of \[x\] and \[y\] will be
A)
\[x=93\] and \[y=34\] done
clear
B)
\[x=92\] and \[y=35\] done
clear
C)
\[x=89\] and \[y=44\] done
clear
D)
\[x=94\] and \[y=36\] done
clear
View Solution play_arrow
-
question_answer57)
Heavy water is used as [Bihar MEE 1996; UPSEAT 1999, 2000, 02]
A)
Control rods done
clear
B)
Moderator done
clear
C)
Fuel done
clear
D)
Coolant done
clear
E)
None of these done
clear
View Solution play_arrow
-
question_answer58)
Unit for radioactive constant is [MP PET 1990]
A)
\[Tim{{e}^{\text{-1}}}\] done
clear
B)
Time done
clear
C)
\[Mole-tim{{e}^{-1}}\] done
clear
D)
\[Time-mol{{e}^{-1}}\] done
clear
View Solution play_arrow
-
question_answer59)
Which of the following is used in dating archeological findings or In a method of absolute dating of fossils a radioactive element is used. It is [CPMT 1983, 85; NCERT 1978; BHU 1981; MP PMT 1993; AFMC 1997]
A)
\[_{92}{{U}^{235}}\] done
clear
B)
\[_{6}{{C}^{14}}\] done
clear
C)
\[_{6}{{C}^{12}}\] done
clear
D)
\[_{20}C{{a}^{40}}\] done
clear
View Solution play_arrow
-
question_answer60)
A radioactive isotope has a half-life of 20 days. If 100 gm of the substance is taken, the weight of the isotope remaining after 40 days is [NCERT 1979]
A)
25 gm done
clear
B)
2.5 gm done
clear
C)
60 gm done
clear
D)
40 gm done
clear
View Solution play_arrow
-
question_answer61)
In a fission reaction the nucleus of an element [NCERT 1977]
A)
Loses only some elementary nuclear particles from another nucleus done
clear
B)
Captures some elementary nuclear particles from another nucleus done
clear
C)
Breaks up into several smaller nuclei done
clear
D)
Breaks up into two smaller nuclei with the loss of same elementary nuclear particles done
clear
View Solution play_arrow
-
question_answer62)
The huge amount of energy which is released during atomic fission is due to [CPMT 1990]
A)
Loss of mass done
clear
B)
Loss of electrons done
clear
C)
Loss of protons done
clear
D)
Loss of \[\alpha \]-particles done
clear
View Solution play_arrow
-
question_answer63)
The measure of binding energy of a nucleus is the [CPMT 1982; Kurukshetra CEE 1998]
A)
Mass defect done
clear
B)
Energy of protons done
clear
C)
Energy of neutrons done
clear
D)
Total energy of nucleons done
clear
View Solution play_arrow
-
question_answer64)
The first controlled artificial disintegration of an atomic nucleus was achieved by [BHU 1987]
A)
Geiger done
clear
B)
Wilson done
clear
C)
Cockcroft done
clear
D)
Rutherford done
clear
View Solution play_arrow
-
question_answer65)
Artificial radioactivity was first discovered by [CPMT 1972; BHU 1984; KCET 1999]
A)
Seaberg done
clear
B)
Rutherford done
clear
C)
Einstein done
clear
D)
Irene Curie & Juliot done
clear
View Solution play_arrow
-
question_answer66)
The half-life period of a radioactive element is 140 days. After 560 days, one gram of the element will reduce to [CPMT 1989; IIT 1986; EAMCET 1992; MP PET 1997; UPSEAT 1999]
A)
\[1/2\,g\] done
clear
B)
\[1/4\,g\] done
clear
C)
\[1/8\,g\] done
clear
D)
\[1/16\,g\] done
clear
View Solution play_arrow
-
question_answer67)
A device used for the measurement of radioactivity is [BHU 1979]
A)
Mass spectrometer done
clear
B)
Cyclotron done
clear
C)
Nuclear reactor done
clear
D)
G.M. counter done
clear
View Solution play_arrow
-
question_answer68)
In a nuclear reactor, chain reaction is controlled by introducing [EAMCET 1984]
A)
Iron rod done
clear
B)
Cadmium rod done
clear
C)
Graphite rod done
clear
D)
Platinum rod done
clear
View Solution play_arrow
-
question_answer69)
In atomic reactors, graphite is used as a [NCERT 1980; MP PET 1989]
A)
Lubricant done
clear
B)
Moderator to slow down neutrons done
clear
C)
Fuel done
clear
D)
Liner of the reactor done
clear
View Solution play_arrow
-
question_answer70)
The modern basis of atomic weight is [MP PET 1989; CPMT 1993]
A)
Isotope \[{{H}^{1}}=1.000\] done
clear
B)
Oxygen = 16.000 done
clear
C)
Isotope \[{{O}^{16}}=16.000\] done
clear
D)
Isotope \[{{C}^{12}}=12.000\] done
clear
View Solution play_arrow
-
question_answer71)
Which radioactive carbon has been helpful in understanding the mechanism of photosynthesis in plants
A)
\[_{6}{{C}^{14}}\] done
clear
B)
\[_{6}{{C}^{13}}\] done
clear
C)
\[_{6}{{C}^{12}}\] done
clear
D)
\[_{6}{{C}^{15}}\] done
clear
View Solution play_arrow
-
question_answer72)
Artificial transmutation was discovered by [Pb.CET 2003]
A)
Pauli done
clear
B)
Rutherford done
clear
C)
Soddy done
clear
D)
Curie done
clear
View Solution play_arrow
-
question_answer73)
Which of the following is an example of nuclear fusion [MP PMT 1989; DCE 2004]
A)
\[_{1}{{H}^{2}}+{{\,}_{1}}{{H}^{2}}\to {{\,}_{2}}H{{e}^{4}}+\]energy done
clear
B)
\[_{92}{{U}^{235}}+{{\,}_{o}}{{n}^{1}}\to {{\,}_{56}}B{{a}^{141}}+{{\,}_{36}}K{{r}^{92}}+{{\,}_{30}}{{n}^{1}}+\]energy done
clear
C)
\[_{13}A{{l}^{27}}+{{\,}_{1}}{{H}^{1}}\to {{\,}_{12}}M{{g}^{24}}+{{\,}_{2}}H{{e}^{4}}\] done
clear
D)
None of these done
clear
View Solution play_arrow
-
question_answer74)
The radioactivity isotope \[_{27}^{60}Co\] which is used in the treatment of cancer can be made by (n, p) reaction. For this reaction the target nucleus is [CBSE PMT 2004]
A)
\[_{28}^{60}Ni\] done
clear
B)
\[_{27}^{60}Co\] done
clear
C)
\[_{28}^{59}Ni\] done
clear
D)
\[_{27}^{59}Co\] done
clear
View Solution play_arrow
-
question_answer75)
Fusion bomb involves [AFMC 2004]
A)
Combination of lighter nuclei into bigger nucleus done
clear
B)
Destruction of heavy nucleus into smaller nuclei done
clear
C)
Combustion of oxygen done
clear
D)
Explosion of TNT done
clear
View Solution play_arrow
-
question_answer76)
The element used for dating the ancient remains is [AFMC 2004]
A)
Ni done
clear
B)
C-14 done
clear
C)
C-12 done
clear
D)
Rd done
clear
View Solution play_arrow
-
question_answer77)
If radium and chlorine combine to from radium chloride the compound is [Kerala PMT 2004]
A)
No longer radioactive done
clear
B)
Twice as radioactive as radium done
clear
C)
Half as radioactive as radium done
clear
D)
As radioactive as radium done
clear
E)
Thrice as radioactive as radium done
clear
View Solution play_arrow
-
question_answer78)
Which of the following is an example of nuclear fission [Pb. CET 2002]
A)
\[_{1}{{H}^{2}}+{{\,}_{1}}{{H}^{2}}\to {{\,}_{2}}H{{e}^{4}}+\gamma \] done
clear
B)
\[A+B\to C+\]energy done
clear
C)
\[_{92}{{U}^{235}}+{{\,}_{0}}{{n}^{1}}\to {{\,}_{56}}B{{a}^{141}}+{{\,}_{36}}K{{r}^{92}}+3{{\,}_{0}}{{n}^{1}}+\]energy done
clear
D)
\[_{13}A{{l}^{27}}+{{\,}_{2}}H{{e}^{4}}\to {{\,}_{15}}{{P}^{30}}+{{\,}_{0}}{{n}^{1}}\] done
clear
View Solution play_arrow
-
question_answer79)
The \[{{C}^{14}}\]to \[{{C}^{12}}\] ratio in a wooden article is 13% that of the fresh wood. Calculate the age of the wooden article. Given that the half-life of \[{{C}^{14}}\] is 5770 years [Pb.CET 2004]
A)
16989 years done
clear
B)
16858 years done
clear
C)
15675 years done
clear
D)
17700 years done
clear
View Solution play_arrow
-
question_answer80)
Hydrogen bomb is based on the principle of [AIEEE 2005]
A)
Nuclear fission done
clear
B)
Natural radioactivity done
clear
C)
Nuclear fusion done
clear
D)
Artificial radioactivity done
clear
View Solution play_arrow
-
question_answer81)
Match List ?I and List-II and choose right one by using code given in list [Kerala CET 2005] List ? I List ?II Nuclear reactor Used substance Component 1. Moderator A Uranium 2. Control rods B Graphite 3. Fuel rods C Boron 4. Coolent D Lead E Sodiu
A)
1-B 2-A 3-C 4-E done
clear
B)
1-B 2-C 3-A 4-E done
clear
C)
1-C 2-B 3-A 4-E done
clear
D)
1-C 2-D 3-A 4-B done
clear
E)
1-D 2-C 3-B 4-A done
clear
View Solution play_arrow