Assertion and Reason (a) If both assertion and reason are true and reason is the correct explanation of the assertion. (b) If both assertion and reason are true but reason is not correct explanation of the assertion. (c) If assertion is true, but reason is false. (d) If both assertion and reason are false. (e) If reason is true, but assertion is false. Assertion: A charge, whether stationary or in motion produces a magnetic field around it. Reason: Moving charges produce only electric field in the surrounding space.
  • (a)
  • (b)
  • (c)
  • (d)
  • (e)
The unit of permittivity of free space ($\epsilon _0$) is
  • $CN^{-1}m^{-1}$
  • $Nm^2C^{-2}$
  • $C^2N^{-1}m^{-2}$
  • $C^2N^{-2}m^{-2}$
A charge Q is placed at the corner of a cube. The electric flux through all the six faces of the cube is
  • $\frac {Q}{\epsilon _0}$
  • $\frac {Q}{6 \epsilon _0}$
  • $\frac {Q}{8 \epsilon _0}$
  • $\frac {Q}{4 \epsilon _0}$
A body can be negatively charged by
  • adding some protons
  • removing neutrons
  • adding electrons
  • removing electrons
A electric dipole placed in a non-uniform electric field experiences
  • no torque and no net force.
  • only a torque but no net force
  • both a torque and a net force
  • only a force but no torque
A point charge +q is placed at the midpoint of a cube of length a. The electric flux emerging from the cube is
  • 0
  • $\frac {6q a^2}{\epsilon _0}$
  • $\frac {q}{6a^2 \epsilon _0}$
  • $\frac {q}{ \epsilon _0}$
Which of the following is correct for Charge (i) Charge is conserved (ii) Charge is quantised (iii) Charge is non transferable (iv) Charge is additive
  • (i) ,(ii) and (iv)
  • (ii) and (iv)
  • (i) and (ii)
  • All are correct
The Electric flux through the surface
electric-field-and-charges-class12-mcq-1.png
  • (i) > (ii) > (iii) > (iv)
  • (i) > (ii)
  • (i) = (ii)= (iii) = (iv)
  • (iii) > (ii)
Match the column
electric-field-and-charges-class12-mcq-2.png
  • p -> i, q -> ii, r -> ii , s-> ii
  • p -> i, q -> ii, r -> i , s-> ii
  • p -> i, q -> i, r -> ii , s-> ii
  • p -> ii, q -> i, r -> i , s-> ii
A metallic spherical shell has an inner radius a and outer radius b. A charge Q is placed at the centre of the spherical cavity, then (i) Surface charge density on the inner surface is $ \frac {-Q}{4  \pi a^2}$ (ii) Surface charge density on the inner surface is $ \frac {Q}{4  \pi b^2}$ (iii) Electric Field inside the spherical cavity at a distance r is given by  $\frac {Q}{4 \pi r^2}$ (iv) Electric Field inside the spherical shell is 0 Which of the following is correct?
  • (i) and (ii)
  • (i) and (iv)
  • (ii) and (iii)
  • All are correct
When air is replaced by a dielectric medium of dielectric constant K, the maximum force of attraction between two charges separated by a distance
  • increases $K^{–1}$ time
  • increases K times
  • decreases K times
  • remains constant
Assertion and Reason (a) If both assertion and reason are true and reason is the correct explanation of the assertion. (b) If both assertion and reason are true but reason is not correct explanation of the assertion. (c) If assertion is true, but reason is false. (d) If both assertion and reason are false. Assertion: Gauss’s law can’t be used to calculate electric field near an electric dipole. Reason: Electric dipole don’t have symmetrical charge distribution.
  • (a)
  • (b)
  • (c)
  • (d)
Assertion and Reason (a) If both assertion and reason are true and reason is the correct explanation of the assertion. (b) If both assertion and reason are true but reason is not correct explanation of the assertion. (c) If assertion is true, but reason is false. (d) If both assertion and reason are false. (e) If reason is true, but assertion is false. Assertion: In a nonuniform electric field, a dipole will have translatory as well as rotatory motion. Reason: In a nonuniform electric field, a dipole experiences a force as well as torque
  • (a)
  • (b)
  • (c)
  • (d)
  • (e)
Assertion and Reason (a) If both assertion and reason are true and reason is the correct explanation of the assertion. (b) If both assertion and reason are true but reason is not correct explanation of the assertion. (c) If assertion is true, but reason is false. (d) If both assertion and reason are false. (e) If reason is true, but assertion is false. Assertion: The electric field is zero inside the cavity within a conductor Reason: Charges in a conductor reside only at its surface.
  • (a)
  • (b)
  • (c)
  • (d)
  • (e)
Assertion and Reason (a) If both assertion and reason are true and reason is the correct explanation of the assertion. (b) If both assertion and reason are true but reason is not correct explanation of the assertion. (c) If assertion is true, but reason is false. (d) If both assertion and reason are false. (e) If reason is true, but assertion is false. Assertion: Electrostatic field does not form closed loops Reason: Electrostatic field is a non-conservative force
  • (a)
  • (b)
  • (c)
  • (d)
  • (e)
The electric field in XYZ region is given as $E_x= \alpha \sqrt x$ $E_y=0$ $E_=0$ A cube is placed in the XYZ region as shown below Calculate the Flux through the cube
electric-field-and-charges-class12-mcq-3.png
  • $\alpha a^{5/2} ( \sqrt 2 -1)$
  • $\alpha a^{3/2} ( \sqrt 2 -1)$
  • $\alpha a^{5/2} ( \sqrt 2 +1)$
  • $\alpha a^{3/2} ( \sqrt 2 +1)$
The charge within the cube is
  • $\epsilon_0 \alpha a^{3/2} \sqrt 2$
  • $\epsilon_0 \alpha a^{5/2} ( \sqrt 2 -1)$
  • $\epsilon_0 \alpha a^{5/2} ( \sqrt 2 +1)$
  • $\epsilon_0 \alpha a^{5/2} \sqrt 2$
A and B are two concentric spheres enclosing charges 2Q and 5Q respectively as shown below What is the ratio of electric flux through B and A
electric-field-and-charges-class12-mcq-4.png
  • 5 : 2
  • 2 : 5
  • 2 : 7
  • 7 : 2
How will the electric flux through the sphere A change if a medium of dielectric constant K is introduced in the space inside A ?
  • Flux will remain same
  • Flux will decrease by K times
  • Flux will increase by K times
  • None of these
How will the electric flux through A changes if the medium of dielectric constant K is introduced in space inside B
  • increase by K times
  • decrease by K times
  • Remains Same
  • none of these
0 h : 0 m : 1 s

Answered Not Answered Not Visited Correct : 0 Incorrect : 0