1. Capacitor is a device used to a. store electrical energy c. vary the resistance b. store magnetic energy d. dissipate energy 2. Capacitor blocks after long time. a. alternating current b. both alternating and current c. direct current d. neither alternating nor direct current 3. Which of the following is a passive device? a. Capacitor . Transistor b. Rectifier d. Vacuum tubes 4. For which medium capacitance is high? a. Air b. Metal c. Mica d. Water 5. Which capacitor relatively costly? a. electrolyte capacitor b. air capacitor b. mica capacitor d. Glass capacitor 6. What will happen to the capacitor just after the source is removed? a. It will not remain in its charged state. b. It will remain in its charged state. c. It will start discharging d. It will become zero. 7. What is the value of capacitance of a capacitor which has a voltage of 4V and has 8C of charge? a. 2F b. 4F c. 6F d. 8F 8. When the supply frequency increases, what happens to a capacitive reactance in the circuit? a. increases c. remains the same b. decreases d. becomes zero 9. At the moment the switch closes on this freshly connected RC circuit a. Q = 0, Io = =/R b. Q = C &, Io = 0 0.632CE TORC c. Q = CE, Io = =/R d. Q = 0, Io (2) (b)10. As the capacitor in the RC circuit above reaches its maximum charge: a. the rate at which the current changes decreases and the rate at which the charge changes increase. b. the rate at which the current changes increases and the rate at which the charge changes increase. c. both rates decrease. d. both rates increase. 11. As the capacitor in the RC circuit above reaches its maximum charge, which of the following statements is FALSE? a. the voltage across the capacitor is at its maximum. b. the voltage across the resistor is zero. c. the sum of the voltages across the capacitor and resistor is equal to the initial voltage across the resistor. d. the sum of the voltages across the capacitor and resistor is equal to the initial voltage across the capacitor. 12. A charged 1 mF capacitor is discharged through a 1.0o k-ohm resistor as shown in S the diagram. If the original charge on the capacitor is Q, approximately what is its +Q RS charge 1.00 s after the switch is closed? SOURCE: faculty.polytechnic.org a. 0.632 Q b. 0.500 Q C. 0.368 Q d. 0.000 Q 13. For the circuit shown in number 12, again a 1 mF capacitor is discharged through a 1.0o k-ohm resistor as shown in the diagram. If the original charge on the capacitor is Q, in terms of Q what is the approximate current in the circuit 1 second after the switch is closed? a. 632 Q b. 500 Q C. 368 Q d. o Q 14. You have a 1 mF capacitor with Q's worth of charge on it. A dielectric whose dielectric constant is 5 is carefully slipped between the plate of the capacitor. Which statement is FALSE? a.) the new capacitance will equal 5C. b.) the new charge on the plates is 5Q. c.) the new voltage across the plates is a fifth what it was. d.) the new electric field between the plates is a fifth what it was. 15. To increase the capacitance of a parallel-plate capacitor, you can a. increase the area of the plates. b. increase the distance between the plates. c. all of these choices. d. none of these choices