Total Questions:50 Total Time: 75 Min
Remaining:
Question:In the nuclear reactors the speed of the neutrons is slowed down by
Heavy water
Ordinary water
Zinc rods
Molten caustic soda
Question:By which law, energy produced in nuclear reaction is given
Graham’s law
Charle’s law
Gas Lussac’s Law
Einstein’s law
Question:A radioactive isotope has a half-life of 10 years. What percentage of the original amount of it remain after 20 years
0
12.5
8
25
Question:In a chain reaction, uranium atom gets fissioned forming two different materials. The total weight of these put together is
More than the weight of parent uranium atom
Less than the weight of parent uranium atom
More or less depends upon experimental conditions
Neither more nor less
Question: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 \({C^{14}}=5760\,yrs)\)
2770 yrs
2966 yrs
2980 yrs
3070 yrs
Question:When a slow neutron goes sufficiently close to a \({U^{235}}\) nucleus, then the process which takes place is
Fusion of \({U^{235}}\)
Fission of \({U^{235}}\)
Fusion of neutron
First (1) then (2)
Question:The huge amount of energy which is released during atomic fission is due to
Loss of mass
Loss of electrons
Loss of protons
Loss of \(\alpha\)-particles
Question:The measure of binding energy of a nucleus is the
Mass defect
Energy of protons
Energy of neutrons
Total energy of nucleons
Question:The first controlled artificial disintegration of an atomic nucleus was achieved by
Geiger
Wilson
Cockcroft
Rutherford
Question:Which of the following is an example of nuclear fission
\(_1{H^2}+{\,_1}{H^2}\to{\,_2}H{e^4}+\gamma\)
\(A+B\toC+\)energy
\(_{92}{U^{235}}+{\,_0}{n^1}\to{\,_{56}}B{a^{141}}+{\,_{36}}K{r^{92}}+3{\,_0}{n^1}+\)energy
\(_{13}A{l^{27}}+{\,_2}H{e^4}\to{\,_{15}}{P^{30}}+{\,_0}{n^1}\)
Question: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
16989 years
16858 years
15675 years
17700 years
Question:Hydrogen bomb is based on the principle of
Nuclear fission
Natural radioactivity
Nuclear fusion
Artificial radioactivity
Question:\(\beta\)-particles are emitted from the atom
Due to disintegration of neutron
Due to disintegration of proton
Due to removal of electron from \(K\) shell
Due to removal of electron from outermost orbit
Question:\(Nd\,(Z=60)\) is a member of group -3 in periodic table. An isotope of it is \(\beta\)-active. The daughter nuclei will be a member of
Group -3
Group – 4
Group -1
Group - 2
Question:On bombarding \(_8{O^{16}}\) with deutrons, the nuclei of the product formed will be
\(_9{F^{18}}\)
\(_9{F^{17}}\)
\(_8{O^{17}}\)
\(_7{N^{14}}\)
Question: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
At. no. 84 and mass number 214
At. no. 82 and mass number 214
At. no. 84 and mass number 218
At. no. 82 and mass number 218
Question:\(\alpha\)-rays have high ionization power because they possess
Lesser kinetic energy
Higher kinetic energy
Lesser penetrating power
Higher penetrating power
Question:When radium atom which is placed in II group, loses an \(\alpha\)- particle, a new element is formed which should be placed in group
Second
First
Fourth
Zero
Question:All the nuclei from the initial element to the final element constitute a series which is called
g-series
b-series
b-g series
Disintegration series
Question:The number of neutrons in the parent nucleus which gives \({N^{14}}\) on \(\beta \) – emission is
7
14
6
Question:Isotopes are atoms having the same
Atomic mass
Mass number
Atomic number
Number of neutrons
Question:Successive emission of an \(\alpha\)-particle and two \(\beta\)-particles by an atom of an element results in the formation of its
Isobar
Isomorph
Isotope
Isomer
Question:Isobaric atoms may contain
Same number of \({p^+}\) and different number of \({n^0}\)
Same number of \({n^0}\) and different number of \({p^+}\)
Same number of both \({p^+}\) and \({n^0}\)
Different numbers of both \({p^+}\) and \({n^0}\)
Question:\(_{20}{X^{40}}\) and \(_{21}{X^{40}}\) are
Isobars
Isotopes
Isotones
Isostereomers
Question:The symbol of an isotope is \(_{32}{X^{65}}\), this reveals that
Its atomic number is 32 and atomic weight is 65
Its atomic number is 65
It has 65 electrons
It has 32 neutrons
Question:Two atoms have the same atomic mass but different atomic numbers. Such atoms are called as
Isoelectronic
Question:Which of the following are pairs of isotopes
\(_1^2{H^+}\) and \(_1^3H\)
\(_1^3H\) and \(_2^4{H^-}\)
\(_2^3He\) and \(_2^4He\)
\(_6^{12}C\) and \(_7^{14}{N^+}\)
Question:Which among the following isotope is not found in natural uranium
\(_{92}{U^{234}}\)
\(_{92}{U^{235}}\)
\(_{92}{U^{238}}\)
\(_{92}{U^{239}}\)
Question:A nuclear reaction must be balanced in terms of
Only energy
Only mass
Mass and energy
None of these
Question:In the following nuclear reaction, the other product is \(_{52}T{e^{130}}{+_1}{H^2}{\to_{53}}{I^{131}}+?\)
Positron
Alpha particle
One neutron
Proton
Question: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
Higher of lead
Higher of bismuth
Same
Question:Which of the following is an \(n,\,p\) reaction
\(_5{C^{13}}+{\,_1}{H^1}\to{\,_6}{C^{14}}\)
\({_7}{N^{14}} + {\,_1}{H^1} \to {\,_8}{O^{15}}\)
\(_{13}A{l^{27}}+{\,_0}{n^1}\to{\,_{12}}M{g^{27}}+{\,_1}{H^1}\)
\(_{92}{U^{235}}+{\,_0}{n^1}\to{\,_{54}}X{e^{140}}+{\,_{38}}S{r^{93}}+3{\,_0}{n^1}\)
Question:The nucleus of an atom is made up of X protons and Y neutrons. For the most stable and abundant nuclei
X and Y are both even
X and Y are both odd
X is even and Y is odd
X is odd and Y is even
Question:Atom A possesses higher values of packing fraction than atom B. The relative stabilities of A and B are
A is more stable than B
B is more stable than A
A and B both are equally stable
Stability does not depend on packing fraction
Question:For the nuclear reaction, \(_{12}^{24}Mg+{\,_1}{D^2}\to\alpha+?\), the missing nucleide is
\(_{11}^{22}Na\)
\(_{11}^{23}Na\)
\(_{12}^{23}Mg\)
\(_{12}^{26}Mg\)
Question:\(_Z{X^M}{+_2}H{e^4}{\to_{15}}{P^{30}}{+_0}{n^1}\). Then
\(Z=12,\,\,M=27\)
\(Z=13,\,\,M=27\)
\(Z=12,\,\,M=17\)
\(Z=13,\,\,M=28\)
Question:Radioactivity was discovered by
Henry Becquerel
J. J. Thomson
Madam Curie
Question:Which of the following is radioactive element
Sulphur
Polonium
Tellurium
Selenium
Question:During \(\beta \) -decay
An atomic electron is ejected
An electron which is already present with in the nucleus is ejected
A neutron in the nucleus decays emitting an electron
A part of binding of the nucleus is converted into an electron
Question:The element californium belongs to the family of
Actinide series
Alkali metal family
Alkaline earth family
Lantanide series
Question:\(1.0g\) of a radioactive isotope was found to reduce to \(125\,mg\) after 24 hours. The half-life of the isotope is
8 hours
24 hours
6 hours
4 hours
Question:A radioactive element decays at such a rate that after 15 minutes only 1/10 of the original amount is left. How many more minutes will be needed when only 1/100 of the original amount will be left
1.5 minutes
15.0 mintues
16.5 minutes
30 minutes
Question:If 12 g of sample is taken, and 6 g of a sample decays in 1 hr. The amount of sample showing decay in next hour is
3 g
1 g
2 g
6 g
Question:What will be half-life period of a nucleus if at the end of 4.2 days, \(N=0.798\,{N_0}\)
15 days
10 days
12.83 days
20 days
Question:The half-life of \(C{o^{60}}\) is 7 years. If one \(gm\) of it decays, the amount of the substance remaining after 28 years is
\(0.25\,gm\)
\(0.125\,gm\)
\(0.0625\,gm\)
\(0.50\,gm\)
Question:A radioactive isotope decays at such a rate that after 96 minutes only \(\frac{1}{8}th\) of the original amount remains. The half-life of this nuclide in minutes is
12
24
32
48
Question:A radioactive element has half-life of one day. After three days, the amount of the element left will be
1/2 of the original amount
1/4 of the original amount
1/8 of the original amount
1/16 of the original amount
Question:The radioactivity due to \({C^{14}}\) isotope (half-life 6000 years) of a sample of wood from an ancient tomb was found to be nearly half that of fresh wood, the tomb is therefore about
3000 years old
6000 years old
9000 years old
1200 years old
Question:If the disintegration constant is \(6.93\times{10^{-6}},\) then half-life of \(_6{C^{14}}\) will be
\({10^2}\)yrs
\({10^3}\)yrs
\({10^4}\)yrs
\({10^5}\)yrs
Question:The decay constant of \(R{a^{226}}\) is \(1.37\times{10^{-11}}{\sec^{-1}}\). A sample of \(R{a^{226}}\) having an activity of 1.5 millicurie will contain ...... atoms
\(3.7\times{10^{17}}\)
\(2.05\times{10^{15}}\)
\(4.7\times{10^{10}}\)
\(4.1\times{10^{18}}\)