Quiz for Capacitors

Q1: What is the SI unit of capacitance?

A. Farad B. Coulomb C. Volt D. Ohm

Q2: Capacitance of a parallel plate capacitor is directly proportional to?

A. Area of plates B. Distance between plates C. Charge stored D. Electric field

Q3: What happens to the capacitance when dielectric is inserted?

A. Increases B. Decreases C. Remains same D. Becomes zero

Q4: Formula for capacitance of parallel plate capacitor?

A. C = ε₀A/d B. C = d/ε₀A C. C = Aε₀d D. C = ε₀/dA

Q5: When two capacitors are connected in parallel, the equivalent capacitance is?

A. Sum of individual capacitances B. Reciprocal of sum C. Product over sum D. Zero

Q6: When two capacitors are connected in series, the equivalent capacitance is?

A. 1/C = 1/C₁ + 1/C₂ B. C = C₁ + C₂ C. C = C₁C₂ D. None of these

Q7: A capacitor blocks?

A. DC current B. AC current C. Both AC and DC D. None

Q8: Which quantity is same for capacitors in series?

A. Charge B. Voltage C. Capacitance D. Resistance

Q9: Dielectric constant is always?

A. > 1 B. < 1 C. = 1 D. Negative

Q10: Inserting dielectric slab in charged capacitor does?

A. Reduces voltage B. Increases voltage C. No change D. Discharges it

Q11: If plate separation increases, capacitance?

A. Decreases B. Increases C. Remains same D. Becomes infinite

Q12: Capacitor is used to?

A. Store energy B. Produce current C. Increase resistance D. Convert energy

Q13: Capacitance of an isolated spherical conductor of radius R is?

A. 4πε₀R B. ε₀R C. 4πR D. πR/ε₀

Q14: Dielectric strength is measured in?

A. V/m B. C/m C. F/m D. J/m

Q15: What happens to energy when plates are separated in isolated capacitor?

A. Increases B. Decreases C. Constant D. Zero

Q16: A capacitor is fully charged when?

A. Current becomes zero B. Voltage is zero C. Resistance is zero D. Temperature is max

Q17: Energy density in capacitor is?

A. ½ε₀E² B. ε₀E² C. ½E/ε₀ D. ε₀/2E²

Q18: Capacitor stores?

A. Electric charge and energy B. Only current C. Only voltage D. Resistance

Q19: Capacitor is charged to V and disconnected. Inserting dielectric?

A. Decreases voltage B. Increases voltage C. No change D. Charges plates more