Capacitance Quiz - CBSE Class 12 Physics

Free practice quiz: Capacitance (CBSE Class 12 Physics). 19 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. What is capacitance?

   1. The ability of a capacitor to store charge
   2. The rate of flow of charge
   3. The force exerted on a charge
   4. The resistance to the flow of charge
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   Answer: A. The ability of a capacitor to store charge

   Capacitance is the ability of a capacitor to store electrical energy in an electric field.

2. What is the effect on the capacitance of a parallel plate capacitor if the distance between the plates is doubled?

   1. Capacitance is doubled
   2. Capacitance is halved
   3. Capacitance remains unchanged
   4. Capacitance is quadrupled
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   Answer: B. Capacitance is halved

   The capacitance of a parallel plate capacitor is inversely proportional to the distance between the plates. Doubling the distance halves the capacitance.

3. A capacitor is charged to a potential difference of 100V and stores 200 μJ of energy. What is its capacitance?

   1. 0.4 μF
   2. 2.5 μF
   3. 40 μF
   4. 25 μF
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   Answer: A. 0.4 μF

   The energy stored in a capacitor is given by U = (1/2)CV². Therefore, C = 2U/V² = 2(200 x 10⁻⁶ J) / (100 V)² = 0.4 x 10⁻⁶ F = 0.4 μF

4. Explain the concept of dielectric breakdown.

   1. The process where a dielectric material becomes a conductor
   2. The process where a dielectric material loses its insulating properties under a high electric field
   3. The process where a dielectric material becomes magnetized
   4. None of the above
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   Answer: B. The process where a dielectric material loses its insulating properties under a high electric field

   Dielectric breakdown is the phenomenon where a dielectric material, under a sufficiently strong electric field, loses its insulating properties and becomes conductive.

5. Compare and contrast the behavior of capacitors and inductors in AC circuits.

   1. Capacitors impede AC current while inductors facilitate it; inductors store energy in a magnetic field while capacitors store energy in an electric field
   2. Both impede AC current; both store energy in a magnetic field
   3. Both facilitate AC current; both store energy in an electric field
   4. Capacitors facilitate AC current while inductors impede it; both store energy in an electric field
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   Answer: A. Capacitors impede AC current while inductors facilitate it; inductors store energy in a magnetic field while capacitors store energy in an electric field

   Capacitors oppose changes in voltage, leading to impedance of AC current, while inductors oppose changes in current. Capacitors store energy in an electric field, and inductors in a magnetic field.

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