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Physics M.C.Q (1 Marks)

Moving Charges and Magnetism · Rajasthan Board (RBSE) STD 12 Science (Rajasthan - English Medium). 27 questions.

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M.C.Q (1 Marks)

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27 questions · auto-graded multiple-choice test.

MCQ 11 Mark
The magnetic dipole moment of a current carrying coil does not depend upon :
  • A
    number of turns of the coil
  • B
    cross-sectional area of the coil
  • C
    current flowing in the coil
  • ✓
    material of the turns of the coil
Answer
Correct option: D.
material of the turns of the coil
D
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MCQ 21 Mark
An electron of charge e moves parallel to uniform lines of force in magnetic field B with velocity v. Force acting on electron is :
  • A
    evB
  • B
    $ev/B$
  • ✓
    zero
  • D
    $Bv/e$
Answer
Correct option: C.
zero
C
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MCQ 31 Mark
The value of $(\mu_{0}\in_{0})^{-1/2}$ is :
  • A
    $3\times10^{8}$ cm/second
  • ✓
    $3\times10^{10}$ cm/second
  • C
    $3\times10^{9}$ cm/second
  • D
    $3\times10^{8}$ km/second
Answer
Correct option: B.
$3\times10^{10}$ cm/second
B
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MCQ 41 Mark
The value of torque ($\vec{\tau}$) experienced by current loop of magnetic moment $(\vec{m})$ placed in magnetic field ($\vec{B}$) is :
  • ✓
    $\vec{\tau}=\vec{m}\times\vec{B}$
  • B
    $\vec{\tau}=\vec{B}\times\vec{m}$
  • C
    $\vec{\tau}=\frac{\vec{m}}{\vec{B}}$
  • D
    $\vec{\tau}=\frac{\vec{B}}{\vec{m}}$
Answer
Correct option: A.
$\vec{\tau}=\vec{m}\times\vec{B}$
A
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MCQ 51 Mark
The energy density of magnetic field $\vec{B}$ is :
  • ✓
    $\frac{B^{2}}{2\mu_{0}}$
  • B
    $\frac{B^{2}}{\mu_{0}}$
  • C
    $\frac{B^{2}}{4\mu_{0}}$
  • D
    $\frac{B^{2}}{3\mu_{0}}$
Answer
Correct option: A.
$\frac{B^{2}}{2\mu_{0}}$
A
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MCQ 61 Mark
Which one of the following is not a unit of magnetic field ?
  • A
    tesla
  • B
    weber/$metre^{2}$
  • C
    newton/ampere-metre
  • ✓
    newton/ampere²
Answer
Correct option: D.
newton/ampere²
D
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MCQ 71 Mark
The magnetic field produced at the centre of current carrying circular coil is :
  • A
    on the plane of coil
  • ✓
    perpendicular to the plane of coil
  • C
    at $45^{\circ}$ to the plane of coil
  • D
    at $180^{\circ}$ to the plane of coil
Answer
Correct option: B.
perpendicular to the plane of coil
B
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MCQ 81 Mark
A galvanometer is converted into ammeter by adding :
  • ✓
    low resistance in parallel
  • B
    high resistance in series
  • C
    low resistance in series
  • D
    high resistance in parallel
Answer
Correct option: A.
low resistance in parallel
A
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MCQ 101 Mark
A magnet is situated near a closed conductor. Current can be produced in the conductor, If :
  • A
    only magnet is in motion
  • B
    only conductor is in motion
  • C
    both magnet and conductor are in motion
  • ✓
    there is relative motion between magnet and conductor
Answer
Correct option: D.
there is relative motion between magnet and conductor
D
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MCQ 111 Mark
When an ammeter is shunted, its measuring range :
  • ✓
    Increases
  • B
    Decreases
  • C
    Remains constant
  • D
    None of these
Answer
Correct option: A.
Increases
A
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MCQ 121 Mark
The torque ($\vec{\tau}$) experienced by a current loop of magnetic momvent $(\overrightarrow{ M })$ placed in magnetic field $\vec{B}$ is :
  • ✓
    $\vec{\tau}=\vec{M}\times\vec{B}$
  • B
    $\vec{\tau}=\vec{B}\times\vec{M}$
  • C
    $\vec{\tau}=\frac{\vec{M}}{\vec{B}}$
  • D
    $\vec{\tau}=\vec{M}.\vec{B}$
Answer
Correct option: A.
$\vec{\tau}=\vec{M}\times\vec{B}$
A
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MCQ 131 Mark
Lorentz force is given by :
  • A
    $q(\vec{E}+\vec{B})$
  • B
    $q(\vec{E}+\frac{\vec{v}}{\vec{B}})$
  • C
    $q(\vec{E}+\vec{B}\times\vec{v})$
  • ✓
    $q(\vec{E}+\vec{v}\times\vec{B})$
Answer
Correct option: D.
$q(\vec{E}+\vec{v}\times\vec{B})$
D
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MCQ 141 Mark
A bar magnet of magnetic moment M is cut into two parts of equal length. The magnetic moment of either part is :
  • A
    M
  • ✓
    $M/2$
  • C
    2M
  • D
    Zero
Answer
Correct option: B.
$M/2$
B
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MCQ 151 Mark
Dimension of magnetic field is :
  • ✓
    $I^{-1}ML^{0}T^{-2}$
  • B
    $I^{0}MLT^{-2}$
  • C
    $IMLT^{-1}$
  • D
    $IM^{-1}L^{-1}T^{-2}$
Answer
Correct option: A.
$I^{-1}ML^{0}T^{-2}$
(A) $I^{-1}ML^{0}T^{-2}$
[Hint : $F =q v B \Rightarrow B = F / q_V $
$ {[B] } =\frac{[ F ]}{[q][v]} $
$ =\frac{\left[ MLT ^{-2}\right]}{[ IT ]\left[ LT ^{-1}\right]}= I ^{-1} ML ^0 T^{-2}$
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MCQ 161 Mark
Dimensions of permeability is :
  • ✓
    $MLT^{-2}A^{-2}$
  • B
    $MLT^{2}A^{-2}$
  • C
    MLT $^2 A^2$
  • D
    $MLT^{-2}A$
Answer
Correct option: A.
$MLT^{-2}A^{-2}$
A
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MCQ 171 Mark
A moving charge produces :
  • A
    only electric field
  • B
    only magnetic field
  • ✓
    both electric and magnetic field
  • D
    none of electric and magnetic field
Answer
Correct option: C.
both electric and magnetic field
C
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MCQ 181 Mark
If the velocity of a charged particle is made twice and that of magnetic field is made half then the radius of the circular path of the charged particle in the magnetic field will become :
  • A
    8 times
  • ✓
    4 times
  • C
    3 times
  • D
    2 times
Answer
Correct option: B.
4 times
B
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MCQ 191 Mark
The value of $(\mu_{0}\in_{0})^{-1/2}$ is :
  • A
    $3\times10^{7}m/s$
  • ✓
    $3\times10^{8}m/s$
  • C
    $3\times10^{9}m/s$
  • D
    $3\times10^{10}m/s$
Answer
Correct option: B.
$3\times10^{8}m/s$
B
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MCQ 201 Mark
An electron (charge 'e') travels with constant velocity v parallel to a homogeneous magnetic field B. The force acting on the electron will be :
  • A
    Bev
  • B
    $Be/v$
  • C
    $B/ev$
  • ✓
    Zero
Answer
Correct option: D.
Zero
D
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MCQ 211 Mark
A particle of mass 'm' and charge 'q' enters in an uniform magnetic field B perpendicularly. The radius of its path will be :
  • A
    $m/qB$
  • B
    $m/qvB$
  • C
    $2m/qB$
  • ✓
    $mv/qB$
Answer
Correct option: D.
$mv/qB$
D
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MCQ 221 Mark
A magnetic field can be produced by :
  • A
    moving charge only
  • B
    varrying electric field
  • ✓
    (a) and (b) both
  • D
    None of these
Answer
Correct option: C.
(a) and (b) both
C
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MCQ 231 Mark
An electron enters perpendicular to a uniform magnetic field. The path of the electron will be :
  • ✓
    circular
  • B
    parabolic
  • C
    linear
  • D
    spiral
Answer
Correct option: A.
circular
A
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MCQ 251 Mark
A current carrying conductor produces :
  • A
    Only electric field
  • B
    Only magnetic field
  • ✓
    Electric and magnetic field both
  • D
    None of these
Answer
Correct option: C.
Electric and magnetic field both
C
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MCQ 261 Mark
According to Biot-Savart's law magnetic field at a point due to a current carrying elements depends upon distance of the point from the element as :
  • A
    $B \propto r$
  • B
    $B \propto 1 / r$
  • C
    $B \propto r ^2$
  • ✓
    $B \propto 1 / r^2$
Answer
Correct option: D.
$B \propto 1 / r^2$
D
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MCQ 271 Mark
If the number of turns in a moving coil galvanometer is increased its sensitivity :
  • ✓
    increases
  • B
    decreases
  • C
    remains the same
  • D
    may increase or decrease
Answer
Correct option: A.
increases
A
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