12583 + Mcqs in Physics Page 87 McqOptions

4301.	In nuclear reactions, we have the conservation of [CPMT 1990; AIIMS 1997]
A.	Mass only
B.	Energy only
C.	Momentum only
D.	Mass, energy and momentum
Answer» E.

Discussion

4302.	Fusion reaction takes place at high temperature because [CPMT 1980; SCRA 1996; RPET 1999]
A.	Atoms are ionised at high temperature
B.	Molecules break-up at high temperature
C.	Nuclei break-up at high temperature
D.	Kinetic energy is high enough to overcome repulsion between nuclei
Answer» E.

Discussion

4303.	In a working nuclear reactor, Cadmium rods, (control rods) are used to [CPMT 2003; MP PMT 2004]
A.	Speed up neutrons
B.	Slow down neutrons
C.	Absorb some neutrons
D.	Absorb all neutrons
Answer» D. Absorb all neutrons

Discussion

4304.	During the nuclear fusion reaction [IIT 1987]
A.	A heavy nucleus breaks into two fragments by itself
B.	A light nucleus bombarded by thermal neutrons breaks up
C.	A heavy nucleus bombarded by thermal neutrons breaks up
D.	Two light nuclei combine to give a heavier nucleus and possibly other products
Answer» E.

Discussion

4305.	Most suitable element for nuclear fission is the element with atomic number near [CPMT 1982]
A.	11
B.	21
C.	52
D.	92
Answer» E.

Discussion

4306.	Atom bomb consists of two pieces of \[_{92}{{U}^{235}}\] and a source of [MP PET/PMT 1988]
A.	Proton
B.	Neutron
C.	Meson
D.	Electron
Answer» C. Meson

Discussion

4307.	When a \[_{4}B{{e}^{9}}\] atom is bombarded with \[\alpha -\] particles, one of the product of nuclear transmutation is\[_{6}{{C}^{12}}\]. The other is [CPMT 1982]
A.	\[_{-1}{{e}^{0}}\]
B.	\[X-\]
C.	\[_{1}{{D}^{2}}\]
D.	\[_{0}{{n}^{1}}\]
Answer» E.

Discussion

4308.	If the binding energy of the deutrium is 2.23 MeV. The mass defect given in a.m.u. is [MP PET 1993]
A.	? 0.0024
B.	? 0.0012
C.	0.0012
D.	0.0024
Answer» E.

Discussion

4309.	Fusion reaction is initiated with the help of [DPMT 2002]
A.	Low temperature
B.	High temperature
C.	Neutrons
D.	Any particle
Answer» C. Neutrons

Discussion

4310.	If the speed of light were 2/3 of its present value, the energy released in a given atomic explosion will be decreased by a fraction [Kerala PET 2002]
A.	2/3
B.	4/9
C.	3/4
D.	5/9
Answer» C. 3/4

Discussion

4311.	Which of the following is the fusion reaction [MP PET 1993]
A.	\[_{1}{{H}^{2}}{{+}_{1}}{{H}^{2}}{{\to }_{2}}H{{e}^{4}}\]
B.	\[_{0}{{n}^{1}}{{+}_{7}}{{N}^{14}}{{\to }_{6}}{{C}^{14}}{{+}_{1}}{{H}^{1}}\]
C.	\[_{0}{{n}^{1}}{{+}_{92}}{{U}^{238}}{{\to }_{93}}N{{p}^{239}}+{{\beta }^{-1}}+\gamma \]
D.	\[_{1}{{H}^{3}}{{\to }_{2}}H{{e}^{3}}+{{\beta }^{-1}}+\gamma \]
Answer» B. \[_{0}{{n}^{1}}{{+}_{7}}{{N}^{14}}{{\to }_{6}}{{C}^{14}}{{+}_{1}}{{H}^{1}}\]

Discussion

4312.	Energy generation in stars is mainly due to [DCE 1999, 2000]
A.	Chemical reactions
B.	Fission of heavy nuclei
C.	Fusion of light nuclei
D.	Fusion of heavy nuclei
Answer» D. Fusion of heavy nuclei

Discussion

4313.	The explosion of the atomic bomb takes place due to [CPMT 1984, 86; BHU 2001]
A.	Nuclear fission
B.	Nuclear fusion
C.	Scattering
D.	Thermionic emission
Answer» B. Nuclear fusion

Discussion

4314.	The process by which a heavy nucleus splits into light nuclei is known as [MP PET 1996]
A.	Fission
B.	\[\alpha -\]decay
C.	Fusion
D.	Chain reaction
Answer» B. \[\alpha -\]decay

Discussion

4315.	The control rod in a nuclear reactor is made of [EAMCET (Med.) 1995]
A.	Uranium
B.	Cadmium
C.	Graphite
D.	Plutonium
Answer» C. Graphite

Discussion

4316.	On the bombardment of neutron with Boron. a-particle is emitted and product nuclei formed is [RPMT 2000]
A.	\[_{6}{{C}^{12}}\]
B.	\[_{3}L{{i}^{6}}\]
C.	\[_{3}L{{i}^{7}}\]
D.	\[_{4}B{{e}^{9}}\]
Answer» D. \[_{4}B{{e}^{9}}\]

Discussion

4317.	Which of the following statement(s) is/(are) correct [IIT 1994]
A.	The rest mass of a stable nucleus is less than the sum of the rest masses of its separated nucleons
B.	The rest mass of a stable nucleus is greater than the sum of the rest masses of its separated nucleons.
C.	In nuclear fusion, energy is released by fusing two nuclei of medium mass (approximately 100 a.m.u.)
D.	In nuclear fission, energy is released by fragmentation of a very heavy nucleus
Answer» E.

Discussion

4318.	The mass defect in a particular nuclear reaction is 0.3 grams. The amount of energy liberated in kilowatt hours is (Velocity of light = \[3\times {{10}^{8}}\,m/s\]) [EAMCET 2003]
A.	\[1.5\times {{10}^{6}}\]
B.	\[2.5\times {{10}^{6}}\]
C.	\[3\times {{10}^{6}}\]
D.	\[7.5\times {{10}^{6}}\]
Answer» E.

Discussion

4319.	If m, mn and mp are the masses of \[_{Z}{{X}^{A}}\]nucleus, neutron and proton respectively [KCET 2003; CPMT 2003]
A.	\[m<{{(A-Z)}_{{{m}_{n}}}}+Z{{m}_{p}}\]
B.	\[m=(A-Z){{m}_{n}}+Z{{m}_{p}}\]
C.	\[m=(A-Z){{m}_{p}}+Z{{m}_{n}}\]
D.	\[m>(A-Z){{m}_{n}}+Z{{m}_{p}}\]
Answer» B. \[m=(A-Z){{m}_{n}}+Z{{m}_{p}}\]

Discussion

4320.	Two protons exerts a nuclear force on each other, the distance between them is [CPMT 2002]
A.	\[{{10}^{-14}}m\]
B.	\[{{10}^{-10}}m\]
C.	\[{{10}^{-12}}m\]
D.	\[{{10}^{-8}}m\]
Answer» B. \[{{10}^{-10}}m\]

Discussion

4321.	As compared 12C atom, 14C atom has [MP PMT 2002]
A.	Two extra protons and two extra electrons
B.	Two extra protons but no extra electrons
C.	Two extra neutrons and no extra electrons
D.	Two extra neutrons and two extra electrons
Answer» D. Two extra neutrons and two extra electrons

Discussion

4322.	The sodium nucleus \[_{11}^{23}Na\] contains [MP PET 2001]
A.	11 electrons
B.	12 protons
C.	23 protons
D.	12 neutrons
Answer» E.

Discussion

4323.	The mass and energy equivalent to 1 a.m.u. respectively [CPMT 2000; MP PET/PMT 2001]
A.	\[1.67\times {{10}^{-27}}\,gm,\,\,9.30\,\,MeV\]
B.	\[1.67\times {{10}^{-27}}\,kg,\,\,930\,\,MeV\]
C.	\[1.67\times {{10}^{-27}}kg,\,\,1\,\,MeV\]
D.	\[1.67\times {{10}^{-34}}\,kg,\,\,1\,\,MeV\]
Answer» C. \[1.67\times {{10}^{-27}}kg,\,\,1\,\,MeV\]

Discussion

4324.	If a \[{{H}_{2}}\] nucleus is completely converted into energy, the energy produced will be around [Kerala (Engg.) 2001]
A.	1 MeV
B.	938 MeV
C.	9.38 MeV
D.	238 MeV
Answer» C. 9.38 MeV

Discussion

4325.	The radius of a nucleus of a mass number A is directly proportional to [MH CET 1999; AMU (Engg.) 2001; UPSEAT 2004]
A.	\[{{A}^{3}}\]
B.	A
C.	\[{{A}^{2/3}}\]
D.	\[{{A}^{1/3}}\]
Answer» E.

Discussion

4326.	The energy equivalent of 1 kilogram of matter is about [MP PET/PMT 1988; MNR 1987]
A.	\[{{10}^{-15}}\]J
B.	1 J
C.	\[{{10}^{-12}}\]J
D.	\[{{P}_{0}}\]J
Answer» E.

Discussion

4327.	\[{{M}_{n}}\] and \[{{M}_{p}}\] represent mass of neutron and proton respectively. If an element having atomic mass M has N-neutron and Z-proton, then the correct relation will be [CBSE PMT 2001]
A.	\[M<[N{{M}_{n}}+Z{{M}_{P}}]\]
B.	\[M>[N{{M}_{n}}+Z{{M}_{P}}]\]
C.	\[M=[N{{M}_{n}}+Z{{M}_{P}}]\]
D.	\[M=N[{{M}_{n}}+{{M}_{P}}]\]
Answer» B. \[M>[N{{M}_{n}}+Z{{M}_{P}}]\]

Discussion

4328.	Two nucleons are at a separation of \[1\times {{10}^{-15}}m\]. The net force between them is \[{{F}_{1}}\], if both are neutrons, \[{{F}_{2}}\] if both are protons and \[{{F}_{3}}\] if one is a proton and other is a neutron. In such a case [KCET (Med.) 2000, 05; UPSEAT 2005]
A.	\[{{F}_{2}}>{{F}_{1}}>{{F}_{3}}\]
B.	\[{{F}_{1}}={{F}_{2}}={{F}_{3}}\]
C.	\[{{F}_{1}}={{F}_{2}}>{{F}_{3}}\]
D.	\[{{F}_{1}}={{F}_{3}}>{{F}_{2}}\]
Answer» C. \[{{F}_{1}}={{F}_{2}}>{{F}_{3}}\]

Discussion

4329.	The force acting between proton and proton inside the nucleus is [RPET 1999]
A.	Coulombic
B.	Nuclear
C.	Both
D.	None of these
Answer» D. None of these

Discussion

4330.	For a nucleus to be stable, the correct relation between neutron number N and Proton number Z is [RPET 1999]
A.	\[N>Z\]
B.	\[N=Z\]
C.	\[N<Z\]
D.	\[N\ge Z\]
Answer» E.

Discussion

4331.	The a-particle is the nucleus of an atom of [MP PET 2003]
A.	Neon
B.	Hydrogen
C.	Helium
D.	Deuterium
Answer» D. Deuterium

Discussion

4332.	Atomic number of a nucleus is Z and atomic mass is M. The number of neutron is [CPMT 1997; RPMT 1999; BHU 1999]
A.	\[M-Z\]
B.	M
C.	Z
D.	\[M+Z\]
Answer» B. M

Discussion

4333.	In a fission reaction \[_{92}^{236}U{{\to }^{117}}X{{+}^{117}}Y+n+n\], the binding energy per nucleon of X and Y is 8.5 MeV whereas of \[^{236}U\]is 7.6 MeV. The total energy liberated will be about [CBSE PMT 1997]
A.	200 KeV
B.	2 MeV
C.	200 MeV
D.	2000 MeV
Answer» D. 2000 MeV

Discussion

4334.	Energy of 1g uranium is equal to [CPMT 1996]
A.	\[9.0\times {{10}^{13}}J\]
B.	\[9.0\times {{10}^{19}}J\]
C.	\[3.0\times {{10}^{16}}J\]
D.	\[3.0\times {{10}^{17}}J\]
Answer» B. \[9.0\times {{10}^{19}}J\]

Discussion

4335.	A nucleus ruptures into two nuclear parts which have their velocity ratio equal to 2 : 1. What will be the ratio of their nuclear size (nuclear radius) [CBSE PMT 1996]
A.	\[{{2}^{1/3}}:1\]
B.	\[1:{{2}^{1/3}}\]
C.	\[{{3}^{1/2}}:1\]
D.	\[1:{{3}^{1/2}}\]
Answer» C. \[{{3}^{1/2}}:1\]

Discussion

4336.	The mass number of He is 4 and that for sulphur is 32. The radius of sulphur nucleus is larger than that of helium, by times [CBSE PMT 1994]
A.	\[\sqrt{8}\]
B.	4
C.	2
D.	8
Answer» D. 8

Discussion

4337.	The mass number of a nucleus is [IIT 1986; ISM Dhanbad 1994; MP PMT 1997; CBSE PMT 2003; MH CET (Med.) 2001]
A.	Always less than its atomic number
B.	Always more than its atomic number
C.	Always equal to its atomic number
D.	Sometimes more than and sometimes equal to its atomic number
Answer» E.

Discussion

4338.	If the binding energy per nucleon in \[L{{i}^{7}}\]and \[H{{e}^{4}}\] nuclei are respectively 5.60 MeV and 7.06 MeV, then energy of reaction \[L{{i}^{7}}+p\to 2{{\ }_{2}}H{{e}^{4}}\] is [CBSE PMT 1994; JIPMER 2000]
A.	19.6 MeV
B.	2.4 MeV
C.	8.4 MeV
D.	17.3 MeV
Answer» E.

Discussion

4339.	The mass of an a-particle is [CBSE PMT 1992]
A.	Less than the sum of masses of two protons and two neutrons
B.	Equal to mass of four protons
C.	Equal to mass of four neutrons .
D.	Equal to sum of masses of two protons and two neutrons
Answer» B. Equal to mass of four protons

Discussion

4340.	Isotopes are atoms having [KCET 1994; BHU 2001]
A.	Same number of protons but different number of neutrons
B.	Same number of neutrons but different number of protons
C.	Same number of protons and neutrons
D.	None of the above
Answer» B. Same number of neutrons but different number of protons

Discussion

4341.	The binding energy per nucleon is maximum in the case of [CBSE PMT 1993; JIPMER 2001, 02]
A.	\[_{4}^{2}He\]
B.	\[_{26}^{56}Fe\]
C.	\[_{56}^{141}Ba\]
D.	\[_{92}^{235}U\]
Answer» C. \[_{56}^{141}Ba\]

Discussion

4342.	Antiparticle of electron is [RPMT 1997]
A.	\[_{0}{{n}^{1}}\]
B.	\[_{1}{{H}^{1}}\]
C.	Positron
D.	Neutrino
Answer» D. Neutrino

Discussion

4343.	In helium nucleus, there are [RPET 1997]
A.	2 protons and 2 electrons
B.	2 neutrons, 2 protons and 2 electrons
C.	2 protons and 2 neutrons
D.	2 positrons and 2 protons
Answer» D. 2 positrons and 2 protons

Discussion

4344.	\[\pi \]mesons can be [RPET 1997]
A.	\[{{\pi }^{+}}\]or \[{{\pi }^{-}}\]
B.	\[{{\pi }^{+}}\]or \[{{\pi }^{0}}\]
C.	\[{{\pi }^{-}}\]or \[{{\pi }^{0}}\]
D.	\[{{\pi }^{+}},\ {{\pi }^{-}}\]or \[{{\pi }^{0}}\]
Answer» E.

Discussion

4345.	Nuclear forces are [EAMCET (Engg.) 1995; CPMT 1999; AMU 2001]
A.	Short ranged attractive and charge independent
B.	Short ranged attractive and charge dependent
C.	Long ranged repulsive and charge independent
D.	Long ranged repulsive and charge dependent
Answer» B. Short ranged attractive and charge dependent

Discussion

4346.	The mass defect per nucleon is called [EAMCET 1994; MP PMT 2002; MP PMT 2002]
A.	Binding energy
B.	Packing fraction
C.	Ionization energy
D.	Excitation energy
Answer» C. Ionization energy

Discussion

4347.	The mass of a neutron is the same as that of [KCET 1994]
A.	A proton
B.	A meson
C.	An epsilon
D.	An electron
Answer» B. A meson

Discussion

4348.	The neutron was discovered by [MP PMT 1992; RPMT 1996]
A.	Marie Curie
B.	Pierre Curie
C.	James Chadwick
D.	Rutherford
Answer» D. Rutherford

Discussion

4349.	Atomic weight of boron is 10.81 and it has two isotopes \[_{5}{{B}^{10}}\]and \[_{5}{{B}^{11}}\]. Then ratio of \[_{5}{{B}^{10}}{{:}_{5}}{{B}^{11}}\]in nature would be [CBSE PMT 1998; JIPMER 2001, 02]
A.	19 : 81
B.	10 : 11
C.	15 : 16
D.	81 : 19
Answer» B. 10 : 11

Discussion

4350.	Radius of \[_{2}^{4}He\]nucleus is 3 Fermi. The radius of \[3\to 2\]nucleus will be [CPMT 1999]
A.	5 Fermi
B.	6 Fermi
C.	11.16 Fermi
D.	8 Fermi
Answer» D. 8 Fermi

Discussion

Explore topic-wise MCQs in Joint Entrance Exam - Main (JEE Main).

In nuclear reactions, we have the conservation of [CPMT 1990; AIIMS 1997]

Fusion reaction takes place at high temperature because [CPMT 1980; SCRA 1996; RPET 1999]

In a working nuclear reactor, Cadmium rods, (control rods) are used to [CPMT 2003; MP PMT 2004]

During the nuclear fusion reaction [IIT 1987]

Most suitable element for nuclear fission is the element with atomic number near [CPMT 1982]

Atom bomb consists of two pieces of \[_{92}{{U}^{235}}\] and a source of [MP PET/PMT 1988]

When a \[_{4}B{{e}^{9}}\] atom is bombarded with \[\alpha -\] particles, one of the product of nuclear transmutation is\[_{6}{{C}^{12}}\]. The other is [CPMT 1982]

If the binding energy of the deutrium is 2.23 MeV. The mass defect given in a.m.u. is [MP PET 1993]

Fusion reaction is initiated with the help of [DPMT 2002]

If the speed of light were 2/3 of its present value, the energy released in a given atomic explosion will be decreased by a fraction [Kerala PET 2002]

Which of the following is the fusion reaction [MP PET 1993]

Energy generation in stars is mainly due to [DCE 1999, 2000]

The explosion of the atomic bomb takes place due to [CPMT 1984, 86; BHU 2001]

The process by which a heavy nucleus splits into light nuclei is known as [MP PET 1996]

The control rod in a nuclear reactor is made of [EAMCET (Med.) 1995]

On the bombardment of neutron with Boron. a-particle is emitted and product nuclei formed is [RPMT 2000]

Which of the following statement(s) is/(are) correct [IIT 1994]

The mass defect in a particular nuclear reaction is 0.3 grams. The amount of energy liberated in kilowatt hours is (Velocity of light = \[3\times {{10}^{8}}\,m/s\]) [EAMCET 2003]

If m, mn and mp are the masses of \[_{Z}{{X}^{A}}\]nucleus, neutron and proton respectively [KCET 2003; CPMT 2003]

Two protons exerts a nuclear force on each other, the distance between them is [CPMT 2002]

As compared 12C atom, 14C atom has [MP PMT 2002]

The sodium nucleus \[_{11}^{23}Na\] contains [MP PET 2001]

The mass and energy equivalent to 1 a.m.u. respectively [CPMT 2000; MP PET/PMT 2001]

If a \[{{H}_{2}}\] nucleus is completely converted into energy, the energy produced will be around [Kerala (Engg.) 2001]

The radius of a nucleus of a mass number A is directly proportional to [MH CET 1999; AMU (Engg.) 2001; UPSEAT 2004]

The energy equivalent of 1 kilogram of matter is about [MP PET/PMT 1988; MNR 1987]

\[{{M}_{n}}\] and \[{{M}_{p}}\] represent mass of neutron and proton respectively. If an element having atomic mass M has N-neutron and Z-proton, then the correct relation will be [CBSE PMT 2001]

Two nucleons are at a separation of \[1\times {{10}^{-15}}m\]. The net force between them is \[{{F}_{1}}\], if both are neutrons, \[{{F}_{2}}\] if both are protons and \[{{F}_{3}}\] if one is a proton and other is a neutron. In such a case [KCET (Med.) 2000, 05; UPSEAT 2005]

The force acting between proton and proton inside the nucleus is [RPET 1999]

For a nucleus to be stable, the correct relation between neutron number N and Proton number Z is [RPET 1999]

The a-particle is the nucleus of an atom of [MP PET 2003]

Atomic number of a nucleus is Z and atomic mass is M. The number of neutron is [CPMT 1997; RPMT 1999; BHU 1999]

In a fission reaction \[_{92}^{236}U{{\to }^{117}}X{{+}^{117}}Y+n+n\], the binding energy per nucleon of X and Y is 8.5 MeV whereas of \[^{236}U\]is 7.6 MeV. The total energy liberated will be about [CBSE PMT 1997]

Energy of 1g uranium is equal to [CPMT 1996]

A nucleus ruptures into two nuclear parts which have their velocity ratio equal to 2 : 1. What will be the ratio of their nuclear size (nuclear radius) [CBSE PMT 1996]

The mass number of He is 4 and that for sulphur is 32. The radius of sulphur nucleus is larger than that of helium, by times [CBSE PMT 1994]

The mass number of a nucleus is [IIT 1986; ISM Dhanbad 1994; MP PMT 1997; CBSE PMT 2003; MH CET (Med.) 2001]

If the binding energy per nucleon in \[L{{i}^{7}}\]and \[H{{e}^{4}}\] nuclei are respectively 5.60 MeV and 7.06 MeV, then energy of reaction \[L{{i}^{7}}+p\to 2{{\ }_{2}}H{{e}^{4}}\] is [CBSE PMT 1994; JIPMER 2000]

The mass of an a-particle is [CBSE PMT 1992]

Isotopes are atoms having [KCET 1994; BHU 2001]

The binding energy per nucleon is maximum in the case of [CBSE PMT 1993; JIPMER 2001, 02]

Antiparticle of electron is [RPMT 1997]

In helium nucleus, there are [RPET 1997]

\[\pi \]mesons can be [RPET 1997]

Nuclear forces are [EAMCET (Engg.) 1995; CPMT 1999; AMU 2001]

The mass defect per nucleon is called [EAMCET 1994; MP PMT 2002; MP PMT 2002]

The mass of a neutron is the same as that of [KCET 1994]

The neutron was discovered by [MP PMT 1992; RPMT 1996]

Atomic weight of boron is 10.81 and it has two isotopes \[_{5}{{B}^{10}}\]and \[_{5}{{B}^{11}}\]. Then ratio of \[_{5}{{B}^{10}}{{:}_{5}}{{B}^{11}}\]in nature would be [CBSE PMT 1998; JIPMER 2001, 02]

Radius of \[_{2}^{4}He\]nucleus is 3 Fermi. The radius of \[3\to 2\]nucleus will be [CPMT 1999]