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Electrostatic Potential and Capacitance Quiz Set-2 MCQ Online Practice Test | Class 12 | Quiz Tweek

Electrostatic Potential and Capacitance Quiz Set-2

Practice Important MCQs for Electrostatic Potential and Capacitance — Physics, Class 12.

This quiz provides 20 purely conceptual and theoretical Multiple Choice Questions (MCQs) for Class 12 Physics, Chapter 2: Electrostatic Potential and Capacitance. Designed for students who want to strengthen their understanding of definitions, derivations, graphs, and physical laws without the burden of complex calculations. It covers essential topics like the properties of conductors, behavior of dielectrics, equipotential surfaces, and the relationship between Electric Field and Potential. These questions are curated based on NCERT guidelines and frequent theoretical questions found in CBSE Board exams and Previous Year Questions (PYQs), making it an excellent resource for quick revision and concept checking.

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Q1. Which of the following quantities is a scalar?

(A)

Electric field intensity

(B)

Electric flux

(C)

Electric potential

(D)

Electric dipole moment

Q2. The electric potential inside a conducting sphere of radius $R$ carrying a charge $Q$ is:

(A)

Zero

(B)

Same as that on the surface

(C)

Inversely proportional to distance from center

(D)

Directly proportional to distance from center

Q3. Work done in moving a positive charge on an equipotential surface is:

(A)

Finite and positive

(B)

Finite and negative

(C)

Zero

(D)

Infinite

Q4. A capacitor is connected to a battery. If a dielectric slab of dielectric constant $K$ is inserted between the plates while the battery remains connected, which quantity remains constant?

(A)

Charge

(B)

Potential difference

(C)

Capacitance

(D)

Energy stored

Q5. The electrostatic potential on the perpendicular bisector of an electric dipole is:

(A)

Zero

(B)

$\frac{1}{4\pi\epsilon_0} \frac{p}{r^2}$

(C)

$\frac{1}{4\pi\epsilon_0} \frac{p}{r}$

(D)

Infinite

Q6. Which of the following graphs correctly represents the variation of electric potential $V$ with distance $r$ for a point charge?

(A)

$V \propto r$

(B)

$V \propto r^2$

(C)

$V \propto 1/r$

(D)

$V \propto 1/r^2$

Q7. A proton moves from a region of higher potential to a region of lower potential. Its electric potential energy:

(A)

Increases

(B)

Decreases

(C)

Remains the same

(D)

Becomes zero

Q8. The energy stored per unit volume (energy density) in a parallel plate capacitor is given by:

(A)

$\frac{1}{2} \epsilon_0 E^2$

(B)

$\frac{1}{2} \epsilon_0^2 E$

(C)

$\epsilon_0 E^2$

(D)

$\frac{E^2}{2\epsilon_0}$

Q9. Two conducting spheres of radii $r_1$ and $r_2$ are charged to the same potential. The ratio of their surface charge densities $\sigma_1 / \sigma_2$ is:

(A)

$r_1 / r_2$

(B)

$r_2 / r_1$

(C)

$r_1^2 / r_2^2$

(D)

$r_2^2 / r_1^2$

Q10. If the distance between the plates of a parallel plate capacitor is increased, its capacitance:

(A)

Increases

(B)

Decreases

(C)

Remains same

(D)

Becomes zero

Q11. The electric field at the surface of a charged conductor is:

(A)

Zero

(B)

Parallel to the surface

(C)

Normal to the surface

(D)

Inclined at $45^\circ$ to the surface

Q12. A bird sitting on a high power electric line is safe because:

(A)

Bird is a non-conductor.

(B)

The potential difference between the feet of the bird is very small.

(C)

The current flows only through the wire.

(D)

The feet of the bird are good insulators.

Q13. What is the geometrical shape of the equipotential surfaces due to a single isolated point charge?

(A)

Concentric spheres

(B)

Parallel planes

(C)

Cylindrical

(D)

Ellipsoidal

Q14. The dimension of capacitance is:

(A)

$[M^{-1} L^{-2} T^4 A^2]$

(B)

$[M L^2 T^{-4} A^{-2}]$

(C)

$[M L^{-2} T^4 A^2]$

(D)

$[M^0 L^0 T^0 A^0]$

Q15. When a dielectric is inserted into a capacitor which is isolated (battery disconnected), the potential difference between the plates:

(A)

Increases

(B)

Decreases

(C)

Remains same

(D)

Becomes zero

...and 5 more challenging questions available in the interactive simulator.

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Frequently Asked Questions

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