CBSE Questions for Class 12 Medical Physics Nuclei Quiz 6 - MCQExams.com

From the following equations, pick out the possible nuclear reactions.
  • $${ { _{ 6 }{ C } } }^{ 13 }\quad +\quad { { _{ 1 }{ H } } }^{ 1 }\quad \rightarrow \quad { { _{ 6 }{ C } } }^{ 14 }\quad +\quad 4.3\quad MeV$$
  • $${ { _{ 6 }{ C } } }^{ 12 }\quad +\quad { { _{ 1 }{ H } } }^{ 1 }\quad \rightarrow \quad { { _{ 7 }{ N } } }^{ 13 }\quad +\quad 2\quad MeV$$
  • $${ { _{ 7 }{ N } } }^{ 14 }\quad +\quad { { _{ 1 }{ H } } }^{ 1 }\quad \rightarrow \quad { { _{ 8 }{ O } } }^{ 15 }\quad +\quad 7.3\quad MeV$$
  • $${ { _{ 92 }U } }^{ 235 }\quad +\quad { { _{ 0 }{ n } } }^{ 1 }\quad \rightarrow \quad { { _{ 54 }{ X } } }^{ 140 }\quad +\quad { { _{ 38 }Si } }^{ 94 }\quad +\quad { { _{ 20 }n } }^{ 1 }\quad +\quad \gamma \quad +\quad 200\quad MeV$$
Statement-I : Energy is released when heavy nuclei undergo fission or light nuclei undergo fusion and 
Statement-11: For heavy nuclei, binding energy per nucleon increases with increasing Z. while for light nuclei it decreases with increasing Z.      
  • Both the statements are true and Statement 2 is the correct explanation for Statement 1.
  • Both the statements are true but Statement 2 is not the correct explanation for Statement 1.
  • Statement 1 is true but Statement 2 is false.
  • Statement 1 is false but Statement 2 is true.
Which statement about nuclear fusion is false?
  • Nuclear fusion happens in the sun
  • Nuclear fusion is the joining of the nuclei of atoms
  • Nuclear fusion is currently used to generate electrical energy
  • Nuclear fusion can use hydrogen as fuel.
Consider the nuclear change
$$^{237}_{93}X\, \xrightarrow{- \alpha}\, A\, \xrightarrow{- \beta}\, B\xrightarrow{- \alpha}\,C$$
Which of the following statements is not correct?
  • Mass number of B is 233
  • Atomic number of A is 91
  • C is an isotope of A
  • B is an isobar of A
Radioactivity is generally does not found in :
  • light nuclei
  • stable nuclei
  • heavy nuclie
  • nuclei of intermediate mass
Hydrogen has________ isotopes. 
  • 2
  • 3
  • 4
  • 5
Modern atomic mass scale is based on the mass of:
  • $$H - 1$$
  • $$C - 12$$
  • $$C - 14$$
  • $$C - 16$$
Which of the following statements about radioactivity is/are true ?
  • It involves outer electrons activity
  • It is not affected by temperature or pressure
  • It is an exothermic process
  • The radioactivity of an element is not affected by any other element compounded by it
Atomic mass of an element is:
  • actual mass of one atom of the element
  • average mass of an atom of different atoms of the element
  • always a whole number
  • None of these
 Which of the following change the  activity of radioisotope ?
  • Temperature
  • Pressure
  • Chemical environment
  • None of the above
Which of the following isotopes is likely to be most stable ?
  • $$^{71}_{30}Zn$$
  • $$^{66}_{30}Zn$$
  • $$^{40}_{20}Ca$$
  • None of these
As compared to $$^{12}C$$ atom, $$^{14}C$$ atom has 
  • Two extra protons and two extra electrons.
  • Two extra protons and no extra electron.
  • Two extra neutrons and no extra electron.
  • Two extra neutrons and two extra electrons.
The reaction $$^2_1H\, +\, ^2_1H\, \rightarrow\, ^3_2He\, +\, ^1_0n$$ is called
  • Fusion
  • Fission
  • Endothermic reaction
  • Spontaneous reaction
Which of the following is an example of nuclear fusion reaction?
  • $$^{233}_{90}TH\, +\, ^1_0n\, \rightarrow\, ^{234}_{90}TH$$
  • $$^{113}_{48}Cd\, +\, ^1_0n\, \rightarrow\, ^{114}_{48}Cd\, +\, \gamma\, -ray$$
  • $$^3_1H\, +\, ^1_1H\, \rightarrow\, ^4_2He$$
  • $$^{239}_{92}U\, \rightarrow\, ^{239}_{93}Np\, +\, ^0_{-1}e$$
Which of the following is used in cancer treatment ?
  • $$^{131}_{53}I$$
  • $$^{32}_{15}P$$
  • $$^{60}_{27}Co$$
  • $$^{2}_{1}H$$
$$^{23}Na$$ is the more stable isotope of $$Na$$. By which process $$^{24}_{11}Na$$ can undergo radioactive decay?
  • $$\beta^--emission$$
  • $$\alpha-emission$$
  • $$\beta^+-emission$$
  • None of these
In the nuclear reaction
$$^{14}_7N\, +\, _2^4He\, \rightarrow\, ^{17}_8O\, +\, ...............$$
What is the missing particle ?
  • $$_2^4He$$
  • $$_1^1H$$
  • $$_0^1n$$
  • $$\gamma$$
Which bomb works on the principle of Nuclear fusion ?
  • Atom bomb
  • Hydrogen bomb
  • Neutron bomb
  • Nuclear reactor
Fusion reaction is also known as ..........
  • Chemical reaction
  • Elastic reaction
  • Thermonuclear reaction
  • Photonuclear reaction
Pick out the isoelectronic species from the following :
$$(I)\, {CH_{3}}^{+}\, \quad\, (II)\, H_3O^+\, \quad\, (III)\, NH_3\, \quad\, (IV)\, {CH_{3}}^{-}$$
  • I and II
  • III and IV only
  • I and III
  • II, III, IV
Biding energy is equal to: (m is the mass defect in amu)
  • $$\Delta m \times 931 MeV$$
  • $$\Delta m \times 831 MeV$$
  • $$\Delta m \times 1031 MeV$$
  • $$\Delta m \times 731 MeV$$
When a hydrogen bomb explodes, which of the following is used?
  • Fission
  • Fussion
  • Both
  • None of these
A natural phenomenon that supports the experimental conclusion that atoms are divisible is :
  • allotropy
  • radioactivity
  • cracking
  • none of these
Two atoms of the same element are found to have different number of neutrons in their nuclei. These two atoms are :
  • Isomers
  • lsotopes
  • Isobars
  • Allotropes
Which atom contains exactly 15 neutrons?
  • $$P^{32}$$ (atomic number $$= 17$$)
  • $$S^{32}$$ (atomic number $$= 16$$)
  • $$O^{15}$$ (atomic number $$= 8$$)
  • $$N^{15}$$ (atomic number $$= 7$$)
Mass number is denoted by:
  • D
  • S
  • A
  • Z
The difference between the sum of the masses of the constituent particles and the mass of an atom is called ___________.
  • Mass number
  • Mass defect
  • Binding energy
  • None of these
$${ _{ 7 }{ { N }^{ 14 } }_{  } }$$ is bombarded with an $$\left(\alpha\right)$$ alfa particle to produce a proto and an unknown nucleus $$'X', $$ 
$${ _{ 7 }{ { N }^{ 14 } }_{  } } + \alpha$$ (particle)  $$\longrightarrow X + p$$
Then $$'X'$$ stands for
  • $${ _{ 7 }{ { N }^{ 15 } }_{ } }$$
  • $${ _{ 8 }{ { N }^{ 14 } }_{ } }$$
  • $${ _{ 8 }{ { O }^{ 17 } }_{ } }$$
  • $${ _{ 8 }{ { O }^{ 16 } }_{ } }$$
Artificial radioactivity was discovered by:
  • Rontegen
  • Becquerel
  • Marie Curie
  • Irene Joliot Curie
One atomic mass unit is equivalent to
  • $$1.67\times 10^{-27} g$$
  • $$1.66\times 10^{-27} kg$$
  • $$1.67\times 10^{-27} mg$$
  • $$1.6\times 10^{-24} g$$
What are the different isotopes formed when protons combine to form a $$_{2}{He}^{4}$$ nucleus ?
  • $$_{1}{H}^{1}$$, $$_{2}{He}^{3}$$
  • $$_{2}{He}^{3}$$, $$_{2}{He}^{3}$$
  • $$_{1}{H}^{1}$$, $$_{1}{He}^{1}$$
  • $$_{2}{H}^{3}$$, $$_{1}{H}^{2}$$
An atom bomb works on :
  • Electrical energy
  • Heat energy
  • Mechanical energy
  • Atomic energy
What is the mass defect and the binding energy of $$_{27}{Co}^{59}$$ which has a nucleus of mass of $$58.933  u$$ ? $$\left({m}_{p} = 1.0078  u,   {m}_{n} = 1.0087  u \right)$$
  • 517.914 MeV
  • 617.914 MeV
  • 17.914 MeV
  • 717.914 MeV
Find the binding energy per nucleon for lithium nucleus $$_{3}{Li}^{7}$$.
Take mass of $$_{3}{Li}^{7} = 7  u$$, mass of proton $$= 1.007825  u$$ and mass of neutron $$= 1.008665  u$$.
Take $$1  u = 931.5  MeV$$.
  • $$3.7 MeV$$
  • $$4.9 MeV$$
  • $$1.7 MeV$$
  • $$7.736 MeV$$
Calculate the binding energy per nucleon for Beryllium $$_{4}{Be}^{9}$$, its mass being $$9.012 \ u$$. The masses of proton and neutron are $$1.008  u$$ and $$1.009  u$$. (Take $$1  u = 931.5  MeV$$)
  • 8.3636  MeV
  • 7.2828 MeV
  • 9.4444 MeV
  • 6.7275 MeV
If the binding energy per nucleon for $$_{3}{Li}^{7}$$ is $$5.6  MeV$$, the total binding energy of a lithium nucleus is?
  • $$139.2 MeV$$
  • $$39.2 MeV$$
  • $$15.8 MeV$$
  • $$115.8 MeV$$
Complete the following reaction.
$$_{13}{Al}^{27} + $$ __________   $$\rightarrow  _{15}{P}^{30} + _{0}{n}^{1}$$
  • $$\alpha$$
  • $$\beta$$
  • $$\gamma$$
  • $$_{ 1 }^{ 1 }{ H }$$
Chlorine has ______isotopes.
  • 1 (one)
  • 2 (two)
  • 3 (three)
  • 4 (four)
What is the atomic mass (u) of chlorine?
  • 34
  • 35.5
  • 33
  • 35
Carbon has __________ isotopes. 
  • 1 (one)
  • 2 (two)
  • 3 (three)
  • 4 (four)
If $$M_0$$ is the mass of an oxygen isotope $$_8O^{17}, M_p$$ and $$M_n$$ are the masses of a proton and a neutron respectively, the nuclear binding energy of the isotope is
  • $$(M_O-8M_p)c^2$$
  • $$(M_O-8M_p-9M_n)c^2$$
  • $$M_Oc^2$$
  • $$(M_O-17M_n)c^2$$
Which scientist proposed the concept of atomic mass?
  • Avogadro
  • Gay Lussac
  • Proust
  • Dalton
$${m}_{p}$$ and $${m}_{n}$$ are masses of proton and neutron respectively. An element of mass $$M$$ has $$Z$$ protons and $$N$$ neutrons then:
  • $$M> Z{m}_{p}+N{m}_{n}$$
  • $$M=Z{m}_{p}+N{m}_{n}$$
  • $$M< Z{m}_{p}+N{m}_{n}$$
  • $$M$$ may be greater than less than or equal to $$Z{m}_{p}+N{m}_{n}$$, depending on nature of element
If $${M}_{0}$$ is the mass of an oxygen isotope $$_{8}{O}^{17},   {M}_{p}$$ and $${M}_{n}$$ are the masses of a proton and a neutron, respectively, then the nuclear binding energy of the isotope is
  • $$\left({M}_{o} - 8{M}_{p}\right) {c}^{2}$$
  • $$\left({M}_{o} - 8{M}_{p} - 9{M}_{n}\right) {c}^{2}$$
  • $${M}_{o}{c}^{2}$$
  • $$\left({M}_{o} - 17{M}_{n}\right) {c}^{2}$$
Fusion reaction takes place at high temperature because
  • KE is high enough to overcome repulsion between nuclei
  • Nuclei are most stable at this temperature
  • Nuclei are unstable at this temperature
  • None of the above
An alpha particle $$(_{  }^{ 4 }{ He })$$ has a mass $$4.00300\ amu$$. A proton has a mass $$1.00783$$ amu and a neutron has a mass $$1.00867\ amu$$ respectively. The binding energy of alpha estimated from these data is closest to:
  • $$27.9\ MeV$$
  • $$22.3\ MeV$$
  • $$35.0\ MeV$$
  • $$20.4\ MeV$$
One atomic mass is equal to
  • $$1.66\times10^{-27}$$ g
  • $$1.66\times10^{-24}$$ g
  • $$1.66\times10^{-23}$$ g
  • $$1.66\times10^{-25}$$ g
When three $$\alpha-particles$$ combined to from a $$^{12}C$$ nucleus, the mass defect is
(atomic mass of $$_{2}He^{4}$$ is $$4.002603\ u$$)
  • $$0.007809\ u$$
  • $$0.002603\ u$$
  • $$4.002603\ u$$
  • $$0.5\ u$$
$${ F }_{ pp },{ F }_{ nn }$$ and $${ F }_{ np }$$ are the nuclear forces between proton-proton, neutron-neutron and neutron-proton respectively. Then relation between them is
  • $${ F }_{ pp }={ F }_{ nn }\neq { F }_{ np }$$
  • $${ F }_{ pp }\neq { F }_{ nn }={ F }_{ np }$$
  • $${ F }_{ pp }={ F }_{ nn }={ F }_{ np }$$
  • $${ F }_{ pp }\neq { F }_{ nn }\neq { F }_{ np }$$
Which of the following is a fusion reaction?
  • $$_{1}H^{2} + _{1}H^{2} \rightarrow _{2}He^{4}$$
  • $$_{1}H^{2} + _{1}H^{2} \rightarrow 2_{1}He^{2}$$
  • $$_{1}H^{1} + _{1}H^{1} \rightarrow _{2}He^{4}$$
  • $$_{1}H^{1} + _{1}H^{2} \rightarrow _{2}He^{4} + n$$
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