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Physics M.C.Q (1 Marks)

Atoms · Gujarat Board (GSEB) STD 12 Science (GSEB - English Medium). 24 questions.

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M.C.Q (1 Marks)

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24 questions · auto-graded multiple-choice test.

MCQ 11 Mark
The value of scattering angle of alpha particle for maximum value of impact parameter is :
  • ✓
    $90^{\circ}$
  • B
    $60^{\circ}$
  • C
    $45^{\circ}$
  • D
    $0^{\circ}$
Answer
Correct option: A.
$90^{\circ}$
(A) - $90^{\circ}$
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MCQ 21 Mark
The value of excitation energy required to bring an electron to the first excited state in hydrogen atom is :
  • A
    13.6 Ev
  • ✓
    10.2 eV
  • C
    3.4 eV
  • D
    $-3,4 eV$
Answer
Correct option: B.
10.2 eV
(B) - 10.2 Ev
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MCQ 31 Mark
Radius of first orbit of hydrogen atom is $0.53\ Å$, radius of fourth orbit will be :
  • A
    $0.193 \ Å $
  • B
    $4.24 \ Å$
  • C
    $2.12 \ Å$
  • ✓
    $8.48 \ Å$
Answer
Correct option: D.
$8.48 \ Å$
(D) - $8.48 \ Å$
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MCQ 41 Mark
The total energy of electron in $n^{\text {th }}$ orbit, according to Bohr's theory :
  • ✓
    $E _n=\frac{-13.6}{n^2} eV$
  • B
    136 eV
  • C
    $E _n=13.6 n^2 eV$
  • D
    None of these
Answer
Correct option: A.
$E _n=\frac{-13.6}{n^2} eV$
(A) - $E _n=\frac{-13.6}{n^2} eV$
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MCQ 51 Mark
According to Bohr's theory, if angular momentum of electron in excited hydrogen atom is $\left(\frac{2 h}{2 \pi}\right)$, then the energy will be :
  • ✓
    -3.4 Ev
  • B
    +3.4 eV
  • C
    -13.6 eV
  • D
    +13.6 eV
Answer
Correct option: A.
-3.4 Ev
(A) - $-3.4 eV$
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MCQ 61 Mark
In scattering experiment, $\alpha$-particles scattered due to which force :
  • A
    Nuclear force
  • ✓
    Coulomb's force
  • C
    (a) and (b)
  • D
    Gravitational force
Answer
Correct option: B.
Coulomb's force
(B) - Coulomb's force
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MCQ 71 Mark
According to Bohr's Model, which is not possible energy value of emitted photon by hydrogen atom :
  • A
    1.9 eV
  • ✓
    11.1 eV
  • C
    13.6 Ev
  • D
    0.65 eV
Answer
Correct option: B.
11.1 eV
(B) - 11.1 Ev
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MCQ 81 Mark
If ionisation energy of hydrogen atom in ground state is 13.6 eV , then ionisation energy of first excited state will be :
  • A
    Zero
  • B
    6.8 eV
  • C
    10.2 eV
  • ✓
    3.4 Ev
Answer
Correct option: D.
3.4 Ev
(D) - 3.4 Ev
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MCQ 91 Mark
According to classical theory, path of electron in Rutherford model :
  • A
    Circular
  • B
    In straight line
  • C
    Parabolic
  • ✓
    Spinal curve
Answer
Correct option: D.
Spinal curve
(D) - Spinal curve
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MCQ 101 Mark
In Rutherford's $\alpha$-scattering experiment, if atomic number increases with thin metal foil then scattering angle is :
  • A
    remains unchange
  • B
    decreases
  • ✓
    increases
  • D
    None of these
Answer
Correct option: C.
increases
(c) - increases
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MCQ 111 Mark
Relation between principal quantum number ' $n$ ' and radius $r_n$ of Bohr's orbit is:
  • A
    $r_n \propto n^{1 / 2}$
  • ✓
    $r_n \propto n^2$
  • C
    $r_n \propto n^2$
  • D
    $r_n \propto n$
Answer
Correct option: B.
$r_n \propto n^2$
(B) - $r_n \propto n^2$
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MCQ 121 Mark
In H -atom the radius of electron's first orbit in A will be :
  • ✓
    0.529
  • B
    1.046
  • C
    2.052
  • D
    2.068
Answer
Correct option: A.
0.529
(A) - 0.529
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MCQ 131 Mark
The ratio of kinetic energy to total energy in Bohr's Model of $n$ quantum level of electron in hydrogen atom will be :
  • A
    1
  • ✓
    - 1
  • C
    2
  • D
    - 2
Answer
Correct option: B.
- 1
(B) - $- 1$
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MCQ 141 Mark
Transition of electron is from energy level $n=4$ to $n=1$ in hydrogen atom. The maximum numbers of photon to be emitted will be :
  • A
    1
  • B
    2
  • C
    3
  • ✓
    6
Answer
Correct option: D.
6
(D) - 6
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MCQ 151 Mark
The energy of hydrogen atom is $E _n$ in $n^{\text {th }}$ orbit. Energy of single ionised helium atom will be :
  • ✓
    $4 E _n$
  • B
    $\frac{E_n}{4}$
  • C
    $2 E _n$
  • D
    $\frac{E_n}{2}$
Answer
Correct option: A.
$4 E _n$
(A) - $4 E _n$
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MCQ 161 Mark
If ionisation potential of hydrogen atom is 13.6 eV , then its energy at $n=3$ :
  • A
    -1.14 eV
  • ✓
    -1.51 eV
  • C
    -3.4 eV
  • D
    -4.53 eV
Answer
Correct option: B.
-1.51 eV
(B) - 1.51 eV
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MCQ 171 Mark
The kinetic energy of revolving electron in hydrogen of radius ' $r$ ' will be :
  • ✓
    $\frac{e^2}{2 r}$
  • B
    $\frac{e^2}{r^2}$
  • C
    $\frac{e^2}{r}$
  • D
    $\frac{e^2}{2 r^2}$
Answer
Correct option: A.
$\frac{e^2}{2 r}$
(A) - $\frac{e^2}{2 r}$
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MCQ 181 Mark
The value of emitted frequency is maximum, while transition of electron :
  • A
    $n=5$ to $n=3$
  • B
    $n=6$ to $n=2$
  • ✓
    $n=2$ to $n=0$
  • D
    $n=0$ to $n=2$
Answer
Correct option: C.
$n=2$ to $n=0$
(C) - $n=2$ to $n=0$
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MCQ 191 Mark
Relation between radius of Bohr's orbit ' $r$ ', integer ' $n$ ' and constant K :
  • ✓
    $r=n^2 K$
  • B
    $r=n K$
  • C
    $r=\frac{n}{K^2}$
  • D
    $r=\frac{n}{K}$
Answer
Correct option: A.
$r=n^2 K$
(A) - $r=n^2 K$
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MCQ 201 Mark
Ionisation energy of 10 times ionised sodium atom will be :
  • A
    $\frac{13.6}{11} eV$
  • B
    $\frac{13.6}{112} eV$
  • ✓
    $13.6 \times(11)^2 eV$
  • D
    13.6 Ev
Answer
Correct option: C.
$13.6 \times(11)^2 eV$
(C) - $13.6 \times(11)^2 eV$
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MCQ 211 Mark
If radius of Bohr's first orbit is ' $r$ ' then radius of second orbit will be :
  • A
    $\frac{r}{2}$
  • B
    $\sqrt{2} r$
  • C
    $2 r$
  • ✓
    $4 r$
Answer
Correct option: D.
$4 r$
(D) - $4 r$
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MCQ 221 Mark
According to Bohr, only those states are stable, in which angular momentum of electron will be :
  • ✓
    $\frac{n h}{2 \pi}$
  • B
    $\frac{n h}{\pi}$
  • C
    $\frac{2 n h}{\pi}$
  • D
    $\frac{n}{2 \pi h}$
Answer
Correct option: A.
$\frac{n h}{2 \pi}$
(A) - $\frac{n h}{2 \pi}$
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MCQ 231 Mark
In hydrogen atom, if transition of electron from third orbit to second orbit, then wavelength of emitted radiation will be :
  • A
    $\frac{5 R}{6}$
  • B
    $\frac{R}{6}$
  • ✓
    $\frac{36}{5 R}$
  • D
    $\frac{5}{R}$
Answer
Correct option: C.
$\frac{36}{5 R}$
(C) - $\frac{36}{5 R}$
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MCQ 241 Mark
Energy of electron in excited hydrogen atom is -3.4 eV. According to Bohr's theory, its angular momentum will be:
  • A
    $\frac{h}{2 \pi}$
  • ✓
    $\frac{2 h}{2 \pi}$
  • C
    $\frac{3 h}{2 \pi}$
  • D
    $\frac{4 h}{2 \pi}$
Answer
Correct option: B.
$\frac{2 h}{2 \pi}$
(B) - $\frac{2 h}{2 \pi}$
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