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Physics M.C.Q (1 Marks)

Nuclei · Gujarat Board (GSEB) STD 12 Science (GSEB - English Medium). 23 questions.

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M.C.Q (1 Marks)

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23 questions · timed · auto-graded

MCQ 11 Mark
Those atoms which have the same atomic number but different mass number are called :
  • A
    isobars
  • B
    isotones
  • ✓
    isotopes
  • D
    isomers
Answer
Correct option: C.
isotopes
(c) - isotopes
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MCQ 21 Mark
For the stability of radiated nucleus:
  • ✓
    The binding energy per nucleon should be high.
  • B
    The binding energy per nucleon should be low.
  • C
    The number of electrons should be more.
  • D
    None of the above
Answer
Correct option: A.
The binding energy per nucleon should be high.
(a) - The binding energy per nucleon should be high.
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MCQ 31 Mark
I a.m.u. is equivalent to the energy of :
  • A
    1 eV
  • B
    14.2 MeV
  • ✓
    931 MeV
  • D
    0.693 MeV
Answer
Correct option: C.
931 MeV
(c) - 931 MeV
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MCQ 41 Mark
The energy generated in nuclear fusion is called :
  • A
    Mechanical energy
  • B
    Nuclear energy
  • ✓
    Thermonuclear energy
  • D
    Electromagnetic energy.
Answer
Correct option: C.
Thermonuclear energy
(c) - Thermonuclear energy
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MCQ 51 Mark
The Sun receives its radiation energy from :
  • A
    Through fission process
  • B
    Through decomposition process
  • C
    By photoelectric effect
  • ✓
    Through fusion process
Answer
Correct option: D.
Through fusion process
(d) - Through fusion process
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MCQ 61 Mark
One of the specialties of nuclear reactions is that in their disintegrated or fused part :
  • A
    The total charge number remains constant.
  • ✓
    The total charge number changes.
  • C
    The total mass number changes.
  • D
    None of the above
Answer
Correct option: B.
The total charge number changes.
(b) - The total charge number changes.
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MCQ 71 Mark
The binding energy per nucleon for the parent nucleus is $E _1$ and for the decayed nuclei is $E _2$. Then :
  • A
    $E _1=2 E _2$
  • B
    $E _1> E _2$
  • ✓
    $E _2> E$
  • D
    $E _2=2 E _1$
Answer
Correct option: C.
$E _2> E$
(c) - $E _2> E$
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MCQ 81 Mark
Fusion process takes place at high temperature because at high temperature :
  • A
    Atoms become ionized.
  • B
    Molecules disintegrate.
  • C
    Nuclei disintegrate.
  • ✓
    The nuclei get so much energy that they can overcome the repulsion force between the nuclei,
Answer
Correct option: D.
The nuclei get so much energy that they can overcome the repulsion force between the nuclei,
(d) - The nuclei get so much energy that they can overcome the repulsion force between the nuclei,
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MCQ 91 Mark
Size of nucleus:
  • A
    The mass of the atom is proportional to the number $( A )$.
  • B
    The mass of the atom is proportional to the square root of the number (A).
  • ✓
    The mass of the atom is proportional to the cube root of number (A).
  • D
    Is proportional to the atomic number $( Z )$ of the atom.
Answer
Correct option: C.
The mass of the atom is proportional to the cube root of number (A).
(c) - The mass of the atom is proportional to the cube root of number (A).
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MCQ 101 Mark
Which scientist discovered the neutron?
  • A
    Rutherford
  • B
    Fermi
  • ✓
    Chadwick
  • D
    Poly
Answer
Correct option: C.
Chadwick
(c) - Chadwick
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MCQ 111 Mark
The size of the nucleus is approximately :
  • A
    $10^{-10}$ meters
  • ✓
    $10^{-15}$ meters
  • C
    $10^{-5}$ meter
  • D
    $10^{-18}$ meters
Answer
Correct option: B.
$10^{-15}$ meters
(b) - $10^{-15}$ meters
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MCQ 121 Mark
For which nucleus will the value of binding energy per nucleon be maximum?
  • ✓
    $_{26} Fe ^{56}$
  • B
    $_8 O ^{16}$
  • C
    $ _2 He ^4$
  • D
    $_{92} U ^{238}$
Answer
Correct option: A.
$_{26} Fe ^{56}$
(a) - $_{26} Fe ^{56}$
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MCQ 131 Mark
The binding energy per nucleon of the nucleus from mass number 40 to 120 is :
  • A
    1.2 MeV
  • B
    2.4 MeV
  • C
    6.8 MeV
  • ✓
    8.5 MeV
Answer
Correct option: D.
8.5 MeV
(d) - 8.5 MeV
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MCQ 141 Mark
The binding energy per nucleon of helium is :
  • A
    8 MeV
  • ✓
    7.0 MeV
  • C
    11 MeV
  • D
    4.0 MeV
Answer
Correct option: B.
7.0 MeV
(b) - 7.0 MeV
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MCQ 151 Mark
The binding energy per nucleon in a nucleus shows:
  • ✓
    its stability
  • B
    its size
  • C
    its mass
  • D
    none of these
Answer
Correct option: A.
its stability
(a) - its stability
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MCQ 161 Mark
The binding energy of a nucleus is equal to :
  • A
    the mass of the nucleus
  • B
    the mass of the proton
  • ✓
    mass loss of nucleus
  • D
    mass of neutron
Answer
Correct option: C.
mass loss of nucleus
(c) - mass loss of nucleus
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MCQ 171 Mark
An atomic mass unit $($amu$)$ will be equal to :
  • ✓
    $12^{th}$ part of the mass of carbon atom
  • B
    $12^{th}$ part of the mass of oxygen atom
  • C
    One $16^{th}$ of the mass of the hydrogen atom
  • D
    One $16^{th}$ of the mass of a helium atom
Answer
Correct option: A.
$12^{th}$ part of the mass of carbon atom
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MCQ 181 Mark
There is a relation between the radius $(R)$ of the nucleus of an atom and the mass number $(A)$ of the atom :
  • A
    $R=R_0 A^{2 / 3}$
  • ✓
    $R = R _0 A^{1 / 3}$
  • C
    $R=R_0 A^{1 / 2}$
  • D
    $R=R_0 \cdot A$
Answer
Correct option: B.
$R = R _0 A^{1 / 3}$
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MCQ 191 Mark
The nature of effective nuclear forces is :
  • A
    Strong electrical repulsion
  • B
    Strong electric attraction
  • ✓
    Strong force of attraction
  • D
    Like Van der Waals forces
Answer
Correct option: C.
Strong force of attraction
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MCQ 201 Mark
The mean age of neutron is :
  • A
    About 100 seconds
  • ✓
    About 1000 seconds
  • C
    About 10 seconds
  • D
    About 1 second
Answer
Correct option: B.
About 1000 seconds
(b) - About 1000 seconds
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MCQ 211 Mark
The fundamental particles of the nucleus of an atom are :
  • ✓
    Neutron and proton
  • B
    Proton and electron
  • C
    Neutron and electron
  • D
    Neutron, proton and electron
Answer
Correct option: A.
Neutron and proton
(a) - Neutron and proton
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MCQ 231 Mark
Rutherford proved the existence of nucleus in atom by scattering of $\alpha$-particles from gold foil. On the nucleus was :
  • ✓
    Positive charge
  • B
  • C
    No charge
  • D
    Both positive and negative charges
Answer
Correct option: A.
Positive charge
(a) - Positive charge
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M.C.Q (1 Marks) - Physics STD 12 Science Questions - Vidyadip