This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Physics (Part I) Chapter 7 Alternating Current – Quiz 35 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 7 Alternating Current Quiz 35 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. How do inductors and capacitors store energy differently in AC circuits? A) Inductors and capacitors both store energy in electric fields. B) Inductors store energy in an electric field; capacitors store energy in a magnetic field. C) Inductors store energy as heat; capacitors store energy in a magnetic field. D) Inductors store energy in a magnetic field; capacitors store energy in an electric field. Show Answer Correct Answer: D) Inductors store energy in a magnetic field; capacitors store energy in an electric field. 2. At resonance, inductive reactance is: A) Greater than capacitive. B) Less than capacitive. C) Equal to capacitive. D) Zero. Show Answer Correct Answer: C) Equal to capacitive. 3. A pure capacitor in an ac circuit A) Stores energy in its electrostatic field. B) Stores energy in its magnetic field. C) Does not store energy. D) Dissipates energy. Show Answer Correct Answer: A) Stores energy in its electrostatic field. 4. Which type of current is used in a battery-powered flashlight? A) Fuel cell current. B) Solar current. C) Direct current. D) Alternating current. Show Answer Correct Answer: C) Direct current. 5. What is meant by rms current? A) Steadyvoltage which delivers the same average power as the a.c. to aresistive load. B) Steadycurrent which delivers the same average power as the a.c. to aresistive load. C) Alternating converted tod.c. D) The square root of the mean of the squares of all values of voltage in one full cycle. Show Answer Correct Answer: B) Steadycurrent which delivers the same average power as the a.c. to aresistive load. 6. In rectification, what is the purpose of a smoothing capacitor? A) To convert AC to DC. B) To reduce the ripple in the output voltage. C) To store energy for later use. D) To increase the peak voltage. Show Answer Correct Answer: B) To reduce the ripple in the output voltage. 7. How does the inductive reactance change with frequency in an AC circuit? A) Inductive reactance decreases with increasing frequency. B) Inductive reactance increases with increasing frequency. C) Inductive reactance is not affected by frequency. D) Inductive reactance remains constant regardless of frequency. Show Answer Correct Answer: B) Inductive reactance increases with increasing frequency. 8. What happens to the electromotive force (EMF) in alternating current (a.c.)? A) It periodically reverses its direction. B) It remains constant. C) It increases over time. D) It decreases over time. Show Answer Correct Answer: A) It periodically reverses its direction. 9. What are the common applications of AC? A) Powering homes and businesses, operating electric motors, supplying electricity to appliances and lighting systems. B) Heating water in boilers. C) Charging electric vehicles. D) Transmitting data over the internet. Show Answer Correct Answer: A) Powering homes and businesses, operating electric motors, supplying electricity to appliances and lighting systems. 10. Impedance of the circuit is A) 21.13 $\Omega$. B) 42.26 $\Omega$. C) 15 $\Omega$. D) 30 $\Omega$. Show Answer Correct Answer: A) 21.13 $\Omega$. 11. What is the phase angle between the voltages of the inductor and capacitor in a RLC series circuit? A) Zero. B) 90$^\circ$. C) 180$^\circ$. D) 270$^\circ$. Show Answer Correct Answer: C) 180$^\circ$. 12. Jika Nilai XL = XC, maka rangkaian tersebut bersifat ..... A) Kapasitif Murni. B) Induktif Murni. C) Resistif. D) Induktif. E) Kapasitif. Show Answer Correct Answer: C) Resistif. 13. What is the formula for impedance in an RL circuit? A) $Z=R+X_L$. B) $Z=\sqrt{R+X_L}$. C) $Z=\sqrt{R^2+X_L^2}$. D) None of the above. Show Answer Correct Answer: C) $Z=\sqrt{R^2+X_L^2}$. 14. If a conductor 0.2m long moves with a velocity of 0.3m/s in a magnetic field of 5T, calculate the emf induced. A) 0.3 V. B) 0.03 V. C) 30 V. D) 3 V. Show Answer Correct Answer: A) 0.3 V. 15. The period of an ac waveform is A) The same as frequency. B) Time required to complete one cycle. C) Expressed in amperes. D) None of the above. Show Answer Correct Answer: B) Time required to complete one cycle. 16. What is the primary advantage of A.C. over D.C.? A) Lower efficiency. B) Higher danger level. C) Easier transmission over long distances. D) More complex circuitry. Show Answer Correct Answer: C) Easier transmission over long distances. 17. The rms value of an ac current is: A) Its peak value. B) Its average value. C) That steady current that produces the same rate of heating in a resistor. D) That steady current that will charge a battery at the same rate. Show Answer Correct Answer: C) That steady current that produces the same rate of heating in a resistor. 18. If frequency becomes zero, AC circuit behaves like: A) Inductive circuit. B) Capacitive circuit. C) DC circuit. D) Resonant circuit. Show Answer Correct Answer: C) DC circuit. 19. When A.C. pass through an inductor, voltage leads the current by: A) Half cycle. B) Quarter cycle. C) Full cycle. D) None of these. Show Answer Correct Answer: B) Quarter cycle. 20. Root Mean Square Value means A) The root of average of square of a quantity. B) The Average of root of square of a quantity. C) The root of Square of Average of a quantity. D) $\sqrt{2}$. Show Answer Correct Answer: A) The root of average of square of a quantity. 21. An alternating current with 200 V voltage and 25 Hz frequency is flowing through a 200 $\Omega$ resistor and $\frac{100}{\pi}\mu F$ A) $\frac{1}{2}\sqrt{2}$. B) $\frac{1}{2}\sqrt{3}$. C) $\frac{1}{2}$. D) -$\frac{1}{2}\sqrt{2}$. E) $\frac{1}{4}\sqrt{3}$. Show Answer Correct Answer: A) $\frac{1}{2}\sqrt{2}$. 22. Basic Electrical system consists of: A) Source, voltage, load. B) Switch, fuse, load. C) Source, conductor, load. D) Source, switch, conductor. Show Answer Correct Answer: C) Source, conductor, load. 23. The relationship between the capacitive reactance of a capacitor is A) Directly proportional to the frequency of the AC source. B) Inversely proportional to the frequency of the AC source. C) Directly proportional to the capacitance of the capacitor. D) None of the above. Show Answer Correct Answer: B) Inversely proportional to the frequency of the AC source. 24. An alternating current of rms value 10 A is passed through a 12 $\Omega$ A) 20 V. B) 90 V. C) 169.7 V. D) None of these. Show Answer Correct Answer: C) 169.7 V. 25. The total capacitance of two 5$\mu$F capacitors and one 10$\mu$F capacitor connected in parallel is ..... A) 5$\mu$F. B) 20$\mu$F. C) 15$\mu$F. D) 25$\mu$F. Show Answer Correct Answer: B) 20$\mu$F. ← 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