JEE Questions for Physics Atoms And Nuclei Quiz 23 - MCQExams.com

Which of the following is suitable for the fusion process?
  • Heavy nuclei
  • Light nuclei
  • Atom bomb
  • Radioactive decay
A deutron is bombarded on 8O16 nucleus and α–particleis emitted. The product nucleus is
  • 7N13
  • 5B10
  • 4Be9
  • 7N14

Physics-Atoms and Nuclei-63756.png
  • γ–decay
  • Fusion
  • Fission
  • β–decay
Solar energy is mainly caused due to
  • Fission of uranium present in the sun
  • Fusion of protons during synthesis of heavier elements
  • Gravitational contraction
  • Burning of hydrogen in the oxygen
The binding energy of nucleus is a measure of its
  • Charge
  • Mass
  • Momentum
  • Stability
Mark the correct statement
  • Nuclei of different elements can have the same number of neutrons
  • Every element has only two stable isotopes
  • Only one isotope of each element is stable
  • All isotopes of every element are radioactive
Mp denotes the mass of a proton and Mn that of a neutron. A given nucleus, of binding energy B, contains Z protons and N neutrons. The mass M (N, Z) of the nucleus is given by (c is the velocity of light)
  • M(N, Z) = NMn + ZMp–Bc2
  • M(N, Z) = NMn + ZMp+Bc2
  • M(N, Z) = NMn + ZMp–B/c2
  • M(N, Z) = NMn + ZMp+B/c2
If in a nuclear fusion process the masses of the fusing nuclei be m1 and m2 and the mass of the resultantnucleus be m3, then
  • m3 = m1 + m2
  • m3 = |m1 + m2|
  • m3<(m1 + m2)
  • m3>(m1 + m2)
The principle of controlled chain reaction is used in
  • Atomic energy reactor
  • Atom bomb
  • The core of sun
  • Artificial radioactivity

Physics-Atoms and Nuclei-63760.png

  • Physics-Atoms and Nuclei-63761.png
  • 2)
    Physics-Atoms and Nuclei-63762.png

  • Physics-Atoms and Nuclei-63763.png

  • Physics-Atoms and Nuclei-63764.png

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  • Physics-Atoms and Nuclei-63767.png
  • 2)
    Physics-Atoms and Nuclei-63768.png

  • Physics-Atoms and Nuclei-63769.png

  • Physics-Atoms and Nuclei-63770.png
Nuclear fusion is common to the pair
  • hermonuclear reactor, uranium based nuclear reactor
  • Energy production is sun, uranium based nuclear reactor
  • Energy production is sun, hydrogen bomb
  • Disintegration of heavy nuclei, hydrogen bomb
The energy in MeV is released due to transformation of 1 kg mass completely into energy (c = 3 × 108 m/s)
  • 7.625 × 10 MeV
  • 10.5 × 1029 MeV
  • 2.8 × 10–28 MeV
  • 5.625 × 1029 MeV
Pick out the unmatched pair from the following
  • Moderator – Heavy water
  • Nuclear fuel –92U235
  • Pressurized water reactor – water as the heat exchange system
  • Safety rods – Carbon
  • Reactor is critical – Multiplication factor is unity
The atoms of same element having different masses butsame chemical properties, are called
  • Isotones
  • Isotopes
  • Isobars
  • Isomers
If the mass number of an atom is A = 40 and its electronconfiguration is 1s2, 2s2, 2p6, 3s2, 3p6, the number of neutrons and protons in its nucleus will be
  • 22, 18
  • 18, 22
  • 20, 20
  • 18, 18
Which of the following is most unstable?
  • Electrons
  • Protons
  • Neutrons
  • α–particle

Physics-Atoms and Nuclei-63774.png
  • c + a – b
  • c – a – b
  • a + b + c
  • a + b – c
The nuclei of which of the following pairs of nuclei are isotones
  • 34Se74, 31Ca71
  • 42Mo92, 40Zr92
  • 38Sr81,38Sr86
  • 20Ca40, 16S32

Physics-Atoms and Nuclei-63777.png
  • Less than 1
  • Greater than 1
  • Equal to 1
  • Depends on the mass of the parent nucleus

Physics-Atoms and Nuclei-63778.png
  • 4 Fermi
  • 5 Fermi
  • 6 Fermi
  • 8 Fermi
For the stability of any nucleus
  • Binding energy per nucleon will be more
  • Binding energy per nucleon will be less
  • Number of electrons will be more
  • None of the above
The functions of moderators in nuclear reactor is to
  • Decrease the speed of neutrons
  • Increase the speed of neutrons
  • Decrease the speed of electrons
  • Increase the speed of electrons

Physics-Atoms and Nuclei-63780.png
  • γ–decay
  • β–decays
  • Fission
  • Fusion
Consider the following statements
S1 The nuclear force is independent of the charge of nucleons.
S2 The number of nucleons in the nucleus of an atom is equal to the number of electrons in the atom.
S3 All nuclei have masses that are less than the sum of the masses of constituent nucleons.
S4 Nucleons belong to the family of leptons while electrons are members of the family of hadrons.
Choose the correct statements (s) from these
  • S1 only
  • S1 and S4
  • S2, S3 and S4
  • S1 and S3
The power obtained in a reactor using U235disintegration is 1000 kW. The mass decay of U235 per hour is
  • 1 microgram
  • 10 microgram
  • 20 microgram
  • 40 microgram
Heavy water is used in nuclear reactors
  • To absorb neutrons to sustain controlled reaction
  • To absorb neutrons to stop the chain reaction
  • To reduce hazardous radiation from nuclear reaction
  • To slow down the neutrons to thermal energies
  • To speed up the nuclear reaction as catalyst
The mass number of a nucleus is
  • Always less than its atomic number
  • Always more than its atomic number
  • Always equal to its atomic number
  • Sometimes more than and sometimes equal to its atomic number
If the nuclear radius of 27Al is 3.6 Fermi, the approximate nuclear radius of 64Cu in Fermi is
  • 2.4
  • 1.2
  • 4.8
  • 3.6
The half life period of radius is 1600 years. The fraction of a sample of radium that would remain after 6400 years is
  • 1/4
  • 1/2
  • 1/8
  • 1/16
During a negative beta decay
  • An atomic electron is ejected
  • An electron which is already present within the nucleus is ejected
  • A neutron in the nucleus decays emitting an electron
  • A part of the binding energy is converted into electron
What percentage of original radioactive atoms is left after five half lives?
  • 0.3%
  • 1%
  • 31%
  • 3.125%
Beta rays emitted by a radioactive material are
  • Electromagnetic radiation
  • The electrons orbiting around the nucleus
  • Charged particles emitted by nucleus
  • Neutral particles
In the given reaction
ZAA → Z–1YA → Z–1KA–4 → Z–1KA–4 radiations are emitted in the sequence
  • α, β, γ
  • β, α, γ
  • γ, α, β
  • β, γ, α
A nucleus of atomic mass A and atomic number Z emits β– particles. The atomic mass and atomic number of the resulting nucleus are
  • A, Z
  • A + 1, Z
  • A, Z + 1
  • A –4, Z –2
If T is the half life of a radioactive material, then the fraction that would remain after a time T/2 is

  • Physics-Atoms and Nuclei-63792.png
  • 2)
    Physics-Atoms and Nuclei-63793.png

  • Physics-Atoms and Nuclei-63794.png

  • Physics-Atoms and Nuclei-63795.png
If the decay or disintegration constant of a radioactive substance is λ, then its half life and mean life are respectively
( loge 2 can be written as In 2)

  • Physics-Atoms and Nuclei-63797.png
  • 2)
    Physics-Atoms and Nuclei-63798.png

  • Physics-Atoms and Nuclei-63799.png

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Which of the following is in the increasing order for penetrating power?
  • α, β, γ
  • β, α, γ
  • γ, α, β
  • γ, β, α
The half life of a radioactive element which has only 1/32 of its original mass left after a lapse of 60 days is
  • 12 days
  • 32 days
  • 60 days
  • 64 days
The half-life of Bi210 is 5 days. What time is taken by (7 /8)th part of the sample to decay
  • 3.4 days
  • 10 days
  • 15 days
  • 20 days

Physics-Atoms and Nuclei-63804.png
  • 172 and 69
  • 174 and 70
  • 176 and 69
  • 176 and 70
If half life of a radio isotope is 2 seconds and number of atoms are only 4, then after one half life remaining (without decay) atoms are probably
  • 1
  • 2
  • 3
  • All of these
Two nuclei have their mass numbers in the ratio of 1 : 3. The ratio of their nuclear densities would be
  • (3)1/3:1
  • 1 : 1
  • 1 : 3
  • 3 : 1
The half life of polonium is 140 days. After how many days, 16 g polonium will be reduced to 1 g (or 15 g will decay)?
  • 700 days
  • 280 days
  • 560 days
  • 420 days
An archaeologist analyses the wood in a prehistoric structure and finds that C14( Half life = 5700 years) to C12 is only one-fourth of that found in the cells of buried plants. The age of the wood is about
  • 5700 years
  • 2850 years
  • 11,400 years
  • 22,800 years
The correct order of ionizing capacity of α, β and γ–rays is
  • α > γ > β
  • α > β > γ
  • α < β < γ
  • γ > α > β
If 20 g of a radioactive substance due to radioactive decay reduces to 10 g in 4 minutes, then in what time 80 g of the same substance will reduce to 10 g
  • In 8 minutes
  • In 12 minutes
  • In 16 minutes
  • In 20 minutes
The count rate of a Geiger- Muller counter for the radiationof a radioactive material of half life of 30 minutes decreases to 5s–1 after 2 hours. The initial count rate was
  • 25s–1
  • 80s–1
  • 625s–1
  • 20s–1
What is the respective number of α and β particles emitted in the following radioactive decay 90X200 → 80Y168
  • 6 and 8
  • 8 and 8
  • 6 and 6
  • 8 and 6
An element used for radioactive carbon dating for more than 5600 years is
  • C–14
  • U – 234
  • U – 238
  • Po – 94
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