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Physics MCQ

Modern Physics · ICSE STD 10 (ICSE - English Medium). 33 questions.

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33 questions · timed · auto-graded

MCQ 11 Mark
Asertion (A): X-rays are emitted when there is a transition of electrons in the inner orbits of an atom.
Reason (R): Gamma radiations are given out from the nucleus.
  • A
    Both A and R are the true and R is a correct explanation of A .
  • ✓
    Both A and R are the true but R is not a correct explanation of A .
  • C
    Assertion is false and Reason is true.
  • D
    Assertion is true and Reason is false.
Answer
Correct option: B.
Both A and R are the true but R is not a correct explanation of A .
B
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MCQ 21 Mark
Assertion (A): If an atom undergoes a chemical change occurring at a low energy, there is a change in the number of orbital electrons of the atom.
Reason (R): If the atom undergoes a nuclear change which occurs at a high energy, there is a change in the number of nucleons inside the nucleus of the atom.
  • A
    Both A and R are the true and R is a correct explanation of A .
  • ✓
    Both A and R are the true but R is not a correct explanation of A .
  • C
    Assertion is false and Reason is true.
  • D
    Assertion is true and Reason is false.
Answer
Correct option: B.
Both A and R are the true but R is not a correct explanation of A .
B
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MCQ 31 Mark
The reaction which takes place in nuclear reactors is :
  • A
    nuclear fission
  • ✓
    controlled nuclear fission
  • C
    nuclear fusion
  • D
    all of these
Answer
Correct option: B.
controlled nuclear fission
B
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MCQ 41 Mark
When the nucleus of a radioactive element, such as uranium is hit by a slow moving neutron, such that it splits into two almost equal nuclei with the release of more neutrons and energy, then the process is called :
  • A
    nuclear fusion
  • ✓
    nuclear fission
  • C
    chemical reaction
  • D
    none of these
Answer
Correct option: B.
nuclear fission
B
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MCQ 51 Mark
${ }_{92} U^{236} \longrightarrow 56 Ba^x+{ }_\gamma Kr^{92}+3 o^{n^1}+\text { energy }$
In the above nuclear equation, the values of $x$ and $y$ are :
  • A
    $x=141, y=34$
  • B
    $x=139, y=35$
  • ✓
    $x=141, y=36$
  • D
    $x=142, y=37$
Answer
Correct option: C.
$x=141, y=36$
C
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MCQ 61 Mark
${ }_{83} Rn^{222} \longrightarrow{ }_7 Po^x+{ }_{+2}^4 He$
In the above equation the value of $x$ and $y$ are :
  • A
    $x=220, y=84$
  • ✓
    $x=218, y=86$
  • C
    $x=218, y=82$
  • D
    none of these
Answer
Correct option: B.
$x=218, y=86$
B
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MCQ 71 Mark
When a radio element ejects only $\gamma$ radiation :
  • A
    there is no change in its mass number
  • B
    there is no change in its atomic number
  • C
    no new element is formed and its place remains the same in periodic table.
  • ✓
    all of these
Answer
Correct option: D.
all of these
D
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MCQ 81 Mark
When a radioactive element ejects a beta particle its :
  • A
    mass number remains same
  • B
    its atomic number increases by 1
  • C
    the new element occupies one place ahead of its original position in periodic table
  • ✓
    all of these
Answer
Correct option: D.
all of these
D

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MCQ 91 Mark
Symbol ${ }_0 n^1$ represents :
  • A
    a single neutron
  • B
    1 amu mass
  • C
    zero charge
  • ✓
    all of these
Answer
Correct option: D.
all of these
D
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MCQ 101 Mark
Symbol ${ }_{+1} P ^1$ represents
  • A
    a single protons
  • B
    1 amu mass
  • C
    +1 charge
  • ✓
    all of these
Answer
Correct option: D.
all of these
D

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MCQ 111 Mark
Symbol ${ }_{-1} e^0$ represents :
  • A
    a single electron
  • B
    -1 charge
  • C
    zero mass
  • ✓
    all of these
Answer
Correct option: D.
all of these
D

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MCQ 121 Mark
A particle naturally tend to be radionctive if :
  • A
    its atomic number is more than 82
  • B
    it has excess of neutron as compared to protons
  • ✓
    both (a) and (b)
  • D
    none of these
Answer
Correct option: C.
both (a) and (b)
C
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MCQ 131 Mark
The charge on alpha particle is :
  • A
    equal to the charge on beta particle
  • B
    half of the charge on beta particle
  • ✓
    double the charge on beta particle
  • D
    none of these
Answer
Correct option: C.
double the charge on beta particle
C
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MCQ 141 Mark
The radiation which affects the photographic plate most is :
  • A
    alpha radiation
  • ✓
    $\gamma$-radiation
  • C
    beta-radiation
  • D
    X-rays
Answer
Correct option: B.
$\gamma$-radiation
B
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MCQ 151 Mark
Nuclear radiation consisting of alpha, beta and $\gamma$-radiation is subjected to strong magnetic field, then
  • A
    alpha radiations are slightly deflected towards north pole
  • B
    beta radiations are strongly deflected towards south pole
  • C
    gamma radiations are not deflected by magnetic field
  • ✓
    all of these
Answer
Correct option: D.
all of these
D
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MCQ 161 Mark
A beam of beta particles is subjected to a strong magnetic field. The beta particles are :
  • ✓
    strongly deflected towards south pole
  • B
    weakly deflected towards south pole
  • C
    weakly deflected towards north pole
  • D
    not deflected at all
Answer
Correct option: A.
strongly deflected towards south pole
A
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MCQ 171 Mark
A beam of alpha particles is subjected to a strong magnetic field. The alpha particles are :
  • A
    strongly deflected towards north pole
  • ✓
    weakly deflected towards north pole
  • C
    weakly deflected towards south pole
  • D
    not deflected at all
Answer
Correct option: B.
weakly deflected towards north pole
B
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MCQ 181 Mark
Which one is not deflected by electric or magnetic fields?
  • A
    Alpha particles
  • B
    $\gamma$-rays
  • C
    $x$-rays
  • ✓
    Both (b) and (c )
Answer
Correct option: D.
Both (b) and (c )
D
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MCQ 191 Mark
Which one is/are pair of isotopes?
  • A
    ${ }_6^{12} C$ and ${ }_6^{14} C$
  • B
    ${ }_1^{24} Na$ and ${ }_{12} Mg ^{24}$
  • C
    ${ }_8 O ^{17}$ and ${ }_8 O ^{16}$
  • ✓
    Both (a) and (c )
Answer
Correct option: D.
Both (a) and (c )
D
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MCQ 201 Mark
Which is a pair of isobars?
  • ✓
    ${ }_{20}^{40} Ca$ and ${ }_{20}^{40} Ar$
  • B
    ${ }_1^1 H$ and ${ }_1^3 H$
  • C
    ${ }_8^{16} O$ and ${ }_8^{17} O$
  • D
    ${ }_{11}^{23} Na$ and ${ }_{11}^{24} Na$
Answer
Correct option: A.
${ }_{20}^{40} Ca$ and ${ }_{20}^{40} Ar$
A

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MCQ 211 Mark
Which is a pair of isotones?
  • ✓
    ${ }_{11} Na ^{23}$ and ${ }_{12} Mg ^{24}$
  • B
    ${ }_7 N^{15}$ and ${ }_7 N^{14}$
  • C
    ${ }_{17} Cl ^{35}$ and ${ }_{17} CP ^{37}$
  • D
    ${ }_{20} Ca ^{40}$ and ${ }_{18} Ar ^{40}$
Answer
Correct option: A.
${ }_{11} Na ^{23}$ and ${ }_{12} Mg ^{24}$
A
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MCQ 221 Mark
Atoms of different elements having same number of neutrons, but different atomic numbers are called:
  • A
    isotopes
  • B
    isobars
  • ✓
    isotones
  • D
    none of these
Answer
Correct option: C.
isotones
C
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MCQ 231 Mark
Which of the following radiations gets deflected most in electric or magnetic field?
  • A
    $\alpha$-narticles
  • ✓
    B-onarticles
  • C
    $y$-radiation
  • D
    X-rays
Answer
Correct option: B.
B-onarticles
B
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MCQ 241 Mark
Which of the following radiations is most penetrating?
  • A
    $\alpha$-narticles
  • B
    B-onarticles
  • ✓
    $y$-radiation
  • D
    X-rays
Answer
Correct option: C.
$y$-radiation
C
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MCQ 251 Mark
Which of the following radiations is most ionising?
  • ✓
    $\alpha$-narticles
  • B
    B-onarticles
  • C
    $y$-radiation
  • D
    X-rays
Answer
Correct option: A.
$\alpha$-narticles
A
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MCQ 261 Mark
During $\beta$-emission an electron is ejected from the atom of radioactive substance. The electron is ejected from the:
  • A
    outermost orbit of atom
  • B
    innermost orbit of atom
  • ✓
    nucleus of the atom
  • D
    none of these
Answer
Correct option: C.
nucleus of the atom
C
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MCQ 271 Mark
During $\beta$-emission:
  • ✓
    the mass number remains unchanged, but atomic number increases by 1 amu .
  • B
    the mass number remains unchanged, but atomic number decreases by 1 amu.
  • C
    the mass number increases by 1 amm, but atomic number remains same.
  • D
    the mass number and atomic number decrease by 1 amu.
Answer
Correct option: A.
the mass number remains unchanged, but atomic number increases by 1 amu .
A
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MCQ 281 Mark
During $\alpha$-emission :
  • A
    the mass number and atomic number of an atom decrease by 2 amu .
  • ✓
    the mass number decreases by 4 amu and atomic number decreases by 2 amu .
  • C
    the mass number remains unchanged, but atomic number decreases by 2 amu.
  • D
    the mass number decreases by 4 amu and atomic number remains unchanged.
Answer
Correct option: B.
the mass number decreases by 4 amu and atomic number decreases by 2 amu .
B
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MCQ 291 Mark
A radioactive substance emits :
  • ✓
    simultaneously $\alpha, \beta$ and $\gamma$ radiations
  • B
    $\alpha$-radiations or $\beta$-radiations
  • C
    in the order of $\alpha, \beta$ and $\gamma$ particles
  • D
    X -rays and $\gamma$-rays
Answer
Correct option: A.
simultaneously $\alpha, \beta$ and $\gamma$ radiations
A
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MCQ 301 Mark
The radiations given out by radioactive elements :
  • A
    affect photographic plates
  • B
    ionise the gases
  • C
    are affected by electrostatic and magnetic fields
  • ✓
    all of these
Answer
Correct option: D.
all of these
D
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MCQ 311 Mark
The atoms of different elements having same mass number, but different atomic numbers are called:
  • A
    isotopes
  • B
    isotones
  • ✓
    isobars
  • D
    none of these
Answer
Correct option: C.
isobars
C
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MCQ 321 Mark
When an element gives out high energy radiations on its own, the change which takes place is :
  • A
    physical change
  • B
    chemical change
  • ✓
    nuclear change
  • D
    none of these
Answer
Correct option: C.
nuclear change
C

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MCQ 331 Mark
The atoms of same element having same atomic number, but different atomic masses are called :
  • ✓
    isotopes
  • B
    isobars
  • C
    isotones
  • D
    both (a) and (b)
Answer
Correct option: A.
isotopes
A
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