This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Physics (Part I) Chapter 7 Alternating Current – Quiz 31 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 7 Alternating Current Quiz 31 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What is the primary use of choke coils in A.C. circuits? A) Store energy. B) Reduce current without power loss. C) Increase current. D) Increase voltage. Show Answer Correct Answer: B) Reduce current without power loss. 2. Fill in the blank:There is a higher level of regrowth compared with the blend or ..... methods. A) Galvanic. B) Laser. C) Waxing. D) Threading. Show Answer Correct Answer: A) Galvanic. 3. A capacitor acts as an infinite resistance for A) AC. B) DC. C) Both AC and DC. D) Neither AC nor DC. Show Answer Correct Answer: B) DC. 4. Which of the following can provide direct current besides batteries? A) Power plants. B) Outlets. C) Solar cells. D) Light bulbs. Show Answer Correct Answer: C) Solar cells. 5. Complete the sentence:The peak potential difference of the UK mains supply is ..... A) 230 V. B) 240 V. C) 250 V. D) 260 V. Show Answer Correct Answer: B) 240 V. 6. What is the process to reduce the range of the output voltage/current, but does not fall to zero? A) Smoothing. B) Amplification. C) Rectification. D) Oscillation. Show Answer Correct Answer: A) Smoothing. 7. Which of the following does NOT depend on frequency? A) Capacitive reactance. B) Inductive reactance. C) Resistance. D) Impedance. Show Answer Correct Answer: C) Resistance. 8. Radio exploits which property of Alternating Currents? A) Sinusoidally Varying Nature. B) Higher Current compared to Direct Current. C) Resonance property of RC circuit. D) Resonance property of LCR circuit. Show Answer Correct Answer: D) Resonance property of LCR circuit. 9. In AC circuit resonance will take place when induced reactance is A) One third of the capacitive reactance. B) Half the capacitive reactance. C) Double the capacitive reactance. D) Equal to the capacitive reactance. Show Answer Correct Answer: D) Equal to the capacitive reactance. 10. Pada suatu rangkaian AC terdiri atas resistor 15 $\Omega$, induktor 6 $\Omega$, dan kapasitor 26 $\Omega$. Impedansi totalnya rangkaian tersebut adalah ..... A) 13 $\Omega$. B) 17 $\Omega$. C) 18 $\Omega$. D) 20 $\Omega$. E) 25 $\Omega$. Show Answer Correct Answer: E) 25 $\Omega$. 11. As the frequency of an ac circuit increases, the current first increases and then decreases. What combination of circuit elements is most likely to comprise the circuit? A) Resistor and inductor. B) Resistor and capacitor. C) Resistor, inductor and capacitor. D) None of these. Show Answer Correct Answer: C) Resistor, inductor and capacitor. 12. What condition occurs when the inductive reactance equals the capacitive reactance? A) Resonance. B) Dissonance. C) Impedance. D) Reactance. Show Answer Correct Answer: A) Resonance. 13. Coagulation uses a lower intensity of high frequency current. What does this cause? A) Coagulation of the protein within the molecules of the tissues and blood vessels. B) Cooling of the skin. C) Increased hair growth. D) Decreased blood flow. Show Answer Correct Answer: A) Coagulation of the protein within the molecules of the tissues and blood vessels. 14. What causes the movement of electrons in a Direct Current? A) Pulsed electrons on a wire. B) The alternating push of electrons along the wire. C) The steady pull of electrons along the wire. D) None of the above. Show Answer Correct Answer: C) The steady pull of electrons along the wire. 15. A battery makes ..... A) Alternating current. B) Direct current. C) All the above. D) None of the above. Show Answer Correct Answer: B) Direct current. 16. Current that is used by most household appliances A) AC. B) DC. C) BC. D) AC/DC. Show Answer Correct Answer: A) AC. 17. The total capacitance of two 15$\mu$F capacitors connected in parallel is ..... A) 5$\mu$F. B) 10$\mu$F. C) 15$\mu$F. D) 30$\mu$F. Show Answer Correct Answer: D) 30$\mu$F. 18. Power companies supply ac, not dc, because: A) The power station generates AC and not DC because the transmission of alternating current is easier and very efficient. B) There is no longer a need for dc. C) Dc is more dangerous. D) There are not enough batteries. Show Answer Correct Answer: A) The power station generates AC and not DC because the transmission of alternating current is easier and very efficient. 19. The transformer voltage induced in the secondary coil of a transformer is mainly due to A) Varying electric field. B) Varying magnetic field. C) Vibrations of the primary coil. D) Iron core of the transformer. Show Answer Correct Answer: B) Varying magnetic field. 20. What is the Q-factor in resonance? A) Power factor. B) Ratio of resonant frequency to bandwidth. C) Ratio of bandwidth to resonant frequency. D) Voltage ratio. Show Answer Correct Answer: B) Ratio of resonant frequency to bandwidth. 21. Describe the impact of impedance mismatch in an AC circuit. A) Elimination of signal reflections. B) Improved waveform distortion. C) The impact of impedance mismatch in an AC circuit includes signal reflections, reduced power transfer efficiency, and waveform distortion. D) Increased power transfer efficiency. Show Answer Correct Answer: C) The impact of impedance mismatch in an AC circuit includes signal reflections, reduced power transfer efficiency, and waveform distortion. 22. What is the phase angle in a sinusoidal AC waveform? A) The phase angle is the frequency of the waveform. B) The phase angle is the duration of one complete cycle. C) The phase angle is the amplitude of the waveform. D) The phase angle is the measure of the phase difference between the waveform and a reference point, expressed in degrees or radians. Show Answer Correct Answer: D) The phase angle is the measure of the phase difference between the waveform and a reference point, expressed in degrees or radians. 23. In a LCR circuit having L = 8.0 henry, C = 0.5 mF and R = 100 ohm in series. The resonance frequency in per second is A) 600 radian. B) 600 Hz. C) 500 radian. D) 500 Hz. Show Answer Correct Answer: C) 500 radian. 24. What is required for emf to be generated in a conductor? A) There must be relative motion between a conductor and a magnetic field. B) The magnetic field must be stationary. C) The conductor must be insulated. D) The conductor must be stationary. Show Answer Correct Answer: A) There must be relative motion between a conductor and a magnetic field. 25. What are the advantages of using AC over DC for power distribution? A) AC can be easily transformed to different voltages, allowing for efficient long-distance transmission and lower energy losses. B) AC is more dangerous than DC for household use. C) AC requires more maintenance than DC systems. D) DC can be easily transformed to different voltages. Show Answer Correct Answer: A) AC can be easily transformed to different voltages, allowing for efficient long-distance transmission and lower energy losses. ← PreviousNext →Related QuizzesClass 12 Physics (Part I) Chapter 7 Alternating Current Quiz 1Class 12 Physics (Part I) Chapter 7 Alternating Current Quiz 2Class 12 Physics (Part I) Chapter 7 Alternating Current Quiz 3Class 12 Physics (Part I) Chapter 7 Alternating Current Quiz 4Class 12 Physics (Part I) Chapter 7 Alternating Current Quiz 5Class 12 Physics (Part I) Chapter 7 Alternating Current Quiz 6Class 12 Physics (Part I) Chapter 7 Alternating Current Quiz 7Class 12 Physics (Part I) Chapter 7 Alternating Current Quiz 8Class 12 Physics (Part I) Chapter 7 Alternating Current Quiz 9Class 12 Physics (Part I) Chapter 7 Alternating Current Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books