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Physics M.C.Q (1 Marks)

Electric Charges and Fields · Gujarat Board (GSEB) STD 12 Science (GSEB - English Medium). 34 questions.

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M.C.Q (1 Marks)

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34 questions · auto-graded multiple-choice test.

MCQ 11 Mark
The value of dielectric strength for air is:
  • ✓
    $3 \times 10^6 V / m$
  • B
    $3 \times 10^8 V / m$
  • C
    Zero
  • D
    Infinity
Answer
Correct option: A.
$3 \times 10^6 V / m$
(a)$3 \times 10^6 V / m$
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MCQ 21 Mark
The electric flux on a Gaussian spherical surface of radius 15 cm, drawn with a point charge as the centre, is ф. If the radius of this surface is tripled, then the electric flux passing through the surface will be:
  • A
    Zero
  • B
    Infinity
  • C
    3ф
  • ✓
    ф
Answer
Correct option: D.
ф
(d)ф
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MCQ 31 Mark
The SI value of electrical conductivity of free space or vacuum is:
  • A
    $9 \times 10^{\circ} Nm ^2 / C ^2$
  • B
    $-9 \times 10^{\circ} Nm ^2 / C ^2$
  • ✓
    $8.854 \times 10^{-12} C ^2 N^{-1} m^{-2}$
  • D
    $8.854 \times 10^{12} C ^2 N^{-1} m^{-2}$
Answer
Correct option: C.
$8.854 \times 10^{-12} C ^2 N^{-1} m^{-2}$
(c )$8.854 \times 10^{-12} C ^2 N^{-1} m^{-2}$
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MCQ 41 Mark
The SI unit of electric flux is:
  • ✓
    $NC ^{-1} m^2$
  • B
    $NC ^{-1} m^-2$
  • C
    $N ^{-1} C ^{-1} m^{-2}$
  • D
    $N ^{-1} C ^{1} m^{2}$
Answer
Correct option: A.
$NC ^{-1} m^2$
(a)$NC ^{-1} m^2$
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MCQ 51 Mark
The magnitude of the electric field due to a point charge at a distance of 4.0 m is 9 N/C. Distance of this point charged substance due to electric field of magnitude 16 N/C will be:
  • A
    1 m
  • B
    2 m
  • ✓
    3 m
  • D
    6 m
Answer
Correct option: C.
3 m
(c )3 m
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MCQ 61 Mark
If an electric dipole is placed in a non-uniform electric field then :
  • A
    only torque will be applied on it
  • B
    no torque will act on it
  • ✓
    resultant force and torque will be applied on it
  • D
    only one force will act on it
Answer
Correct option: C.
resultant force and torque will be applied on it
(c) resultant force and torque will be applied on it
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MCQ 71 Mark
The state of charge inside a closed surface is changed in such a way that total charge remains constant, the flow of electric flux from the closed surface:
  • A
    increases
  • B
    decreases
  • C
    changes randomly
  • ✓
    remains unchanhed
Answer
Correct option: D.
remains unchanhed
(d)remains unchanhed
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MCQ 81 Mark
A charged conducting sphere does not produce an electric field:
  • ✓
    at some interior point
  • B
    at some external point
  • C
    at a distance of more than 2 meters
  • D
    at a distance of more than 10 meters
Answer
Correct option: A.
at some interior point
(a)at some interior point
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MCQ 101 Mark
Gauss's law in dielectric medium:
  • ✓
    $\oint \epsilon_1 E d s=\frac{q}{\epsilon_0}$
  • B
    $\oint E d s=\frac{q}{\epsilon_0}$
  • C
    $\oint \frac{E d s}{\epsilon_1}=\frac{q}{\epsilon_0}$
  • D
    $\oint E d s=0$
Answer
Correct option: A.
$\oint \epsilon_1 E d s=\frac{q}{\epsilon_0}$
(a)$\oint \epsilon_1 E d s=\frac{q}{\epsilon_0}$
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MCQ 111 Mark
Due to a dipole, the field at a distance r on its axial line and the field at a distance r on its perpendicular bise- ctor (non-axis line) will be produced:
  • A
    4:1
  • B
    1:4
  • ✓
    2:1
  • D
    1:2
Answer
Correct option: C.
2:1
(c )2:1
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MCQ 121 Mark
For which regions is Gauss' law true?
  • A
    For uniform regions
  • B
    For all regions
  • ✓
    For regions following the inverse square law
  • D
    Rule has nothing to do with region
Answer
Correct option: C.
For regions following the inverse square law
(c )For regions following the inverse square law
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MCQ 131 Mark
If the dipole with charges $\pm q$ are kept perpendicular to each other inside a closed cube, then the total electric flux emerging out of the cube will be:
  • A
    $\frac{q}{\epsilon_0}$
  • B
    $\frac{2 q}{\epsilon_0}$
  • C
    $\frac{4 q}{\epsilon_0}$
  • ✓
    zero
Answer
Correct option: D.
zero
(d)zero
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MCQ 141 Mark
An electric dipole placed in a uniform elecrtric field exepriences:
  • ✓
    only moment
  • B
    only one force
  • C
    force and moment
  • D
    none of these
Answer
Correct option: A.
only moment
(a)only moment
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MCQ 151 Mark
If an electric dipole is placed in an electric field, then the value of the torque acting on it will be:
  • A
    $p E \cos \theta$
  • ✓
    $p E \sin \theta$
  • C
    $p E(1-\cos \theta)$
  • D
    zero
Answer
Correct option: B.
$p E \sin \theta$
(b)$p E \sin \theta$
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MCQ 161 Mark
If the distance between H and Cl in HCl molecule is 1.28 A, then the value of electric dipole moment of this molecule will be (in Coulomb-meter):
  • A
    $1.6 \times 10^{-29}$
  • B
    $1.28 \times 10^{-29}$
  • C
    $2.05 \times 10^{-19}$
  • ✓
    $2.05 \times 10^{-29}$
Answer
Correct option: D.
$2.05 \times 10^{-29}$
(d)$2.05 \times 10^{-29}$
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MCQ 171 Mark
The formula of torque due to electric dipole is:
  • ✓
    $\vec{\tau}=\vec{p} \times \vec{E}$
  • B
    $\vec{\tau}=\overrightarrow{ E } \times \vec{p}$
  • C
    $\vec{\tau}=\frac{1}{4 \pi \epsilon_0} \vec{p} \times \vec{E}$
  • D
    $\vec{\tau}=\vec{p} \cdot \overrightarrow{ E }$
Answer
Correct option: A.
$\vec{\tau}=\vec{p} \times \vec{E}$
(a)$\vec{\tau}=\vec{p} \times \vec{E}$
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MCQ 181 Mark
The unit of dipole moment is:
  • A
    volt
  • B
    joule
  • C
    coulomb/meter
  • ✓
    coulomb- meter
Answer
Correct option: D.
coulomb- meter
(d)coulomb- meter
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MCQ 191 Mark
The intensity of the field generated at a point due to an electric dipole is directly proportional to:
  • A
    $r^2$
  • B
    $r^-2$
  • ✓
    $r^-3$
  • D
    $r^3$
Answer
Correct option: C.
$r^-3$
(c )$r^-3$
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MCQ 201 Mark
Charges of + 10 Coulombs are placed at both corners of one diagonal of a square and charges of -10 coulomb are placed at the other two corners, then at the centre of the square:
  • ✓
    E = 0, V = 0
  • B
    E≠ 0, V≠0
  • C
    E≠ 0 but V≠0
  • D
    E≠ 0, V = 0
Answer
Correct option: A.
E = 0, V = 0
(a)E = 0, V = 0
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MCQ 211 Mark
Two charged spheres of radii R, and R2 are connected by a wire. The ratio of the electric fields of the spheres is:
  • A
    $R _2^2 / R _1^2$
  • B
    $R _1{ }^2 / R _2{ }^2$
  • ✓
    $R _2 / R _1$
  • D
    $R _1 / R _2$
Answer
Correct option: C.
$R _2 / R _1$
(c )$R _2 / R _1$
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MCQ 221 Mark
Two charges of $+2 \mu C$ and $+8 \mu C$ are located at a distance of one meter. At what distance from a $2 \mu C$ charge will the electric field be zero on the line joining them?
  • A
    $\frac{1}{8}$ meter
  • B
    $\frac{1}{4}$ meter
  • ✓
    $\frac{1}{3}$ meter
  • D
    $\frac{1}{2}$ meter
Answer
Correct option: C.
$\frac{1}{3}$ meter
(c )$\frac{1}{3}$ meter
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MCQ 231 Mark
The force between point charges kept in vacuum is 18 Newton. If a glass plate of dielectric constant 6 is placed between these charges, then the value of force will be:
  • A
    108 Newton
  • B
    18 Newton
  • ✓
    Newton
  • D
    Zero
Answer
Correct option: C.
Newton
(c )Newton
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MCQ 241 Mark
The force between two charges is F. If the distance between them is tripled, the electric force between these charges wll be:
  • A
    F
  • B
    $\frac{1}{3} F$
  • ✓
    $\frac{1}{9} F$
  • D
    $\frac{1}{27} F$
Answer
Correct option: C.
$\frac{1}{9} F$
(c )$\frac{1}{9} F$
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MCQ 251 Mark
Compared to the electric force between two elec- trons, the electrostatic force between two protons is:
  • A
    more
  • B
    less
  • C
    zero
  • ✓
    is the same
Answer
Correct option: D.
is the same
(d)is the same
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MCQ 261 Mark
Indirect method of charging is:
  • ✓
    charging by induction
  • B
    to charge by physical contact
  • C
    charging by friction
  • D
    none of these
Answer
Correct option: A.
charging by induction
(a)charging by induction
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MCQ 271 Mark
The unit of electric field intensity is:
  • A
    Volt meter
  • ✓
    Newton per Coulomb
  • C
    Newton-Coulomb
  • D
    Newton per Volt
Answer
Correct option: B.
Newton per Coulomb
(b)Newton per Coulomb
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MCQ 281 Mark
Which of the following statements related to static electricity is not true?
  • A
    Charge is conserved
  • B
    Charge is quantized
  • C
    Line of force shows the direction of the field
  • ✓
    Electrons are produced due to friction
Answer
Correct option: D.
Electrons are produced due to friction
(d)Electrons are produced due to friction
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MCQ 291 Mark
How many electrons will there be in one coulomb of charge?
  • A
    $5.46 \times 10^{29}$
  • ✓
    $6.25 \times 10^{18}$
  • C
    $1.6 \times 10^{19}$
  • D
    $9\times 10^{11}$
Answer
Correct option: B.
$6.25 \times 10^{18}$
(b)$6.25 \times 10^{18}$
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MCQ 301 Mark
The force between unlike charges is:
  • A
    Gravitational force
  • B
    Magnetic force
  • C
    Nuclear attraction
  • ✓
    Coulomb's attraction
Answer
Correct option: D.
Coulomb's attraction
(d)Coulomb's attraction
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MCQ 311 Mark
The reason for the energy associated with a moving charge is:
  • ✓
    electric field
  • B
    magnetic field
  • C
    both electric and magnetic fields
  • D
    none of these
Answer
Correct option: A.
electric field
(a)electric field
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MCQ 321 Mark
One conducting sphere has 50e charge and the other identical sphere has + 20e charge. If both the sphere are touched and separated, then the charge on each will be:
  • ✓
    -15e
  • B
    + 15e
  • C
    10e
  • D
    25e
Answer
Correct option: A.
-15e
(a)-15e
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MCQ 331 Mark
When a soap bubble is negatively charged, its radius is:
  • A
    will decrease
  • ✓
    will increase
  • C
    will remain unchanged
  • D
    initially it will decrrase, then it will increase and the bubble will burst
Answer
Correct option: B.
will increase
(b)will increase
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MCQ 341 Mark
An object can be negatively charged by:
  • ✓
    by giving it extra electrons
  • B
    by removing some electrons from it
  • C
    by giving it some protons
  • D
    by removing some neutrons from it
Answer
Correct option: A.
by giving it extra electrons
(a)by giving it extra electrons
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