This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Physics (Part I) Chapter 7 Alternating Current – Quiz 40 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 7 Alternating Current Quiz 40 (16 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which one of the below AC parameters show the effective Dc value? A) Peak Value. B) RMS value. C) Peak to peak value. D) Frequency. Show Answer Correct Answer: B) RMS value. 2. If $E_o$ A) $\frac{E_o}{2}$. B) $\frac{E_o}{\sqrt[]{2}}$. C) $\sqrt[]{\frac{E_o}{2}}$. D) $E_o\sqrt[]{2}$. Show Answer Correct Answer: B) $\frac{E_o}{\sqrt[]{2}}$. 3. An Ac voltmeter connected with 50 Hz AC source it read 200 V, maximum voltage during periodic time will be . A) 28.2 V. B) 2.82 V. C) 282 V. D) 0.282 V. Show Answer Correct Answer: C) 282 V. 4. All of the following are electromagnetic waves EXCEPT A) Light. B) Radio. C) Sound. D) Infra-red. Show Answer Correct Answer: C) Sound. 5. What role does capacitive reactance play in AC circuits? A) Capacitive reactance enhances AC flow and reduces phase differences. B) Capacitive reactance only applies to DC circuits. C) Capacitive reactance opposes AC flow and affects phase relationships in circuits. D) Capacitive reactance has no effect on AC circuits. Show Answer Correct Answer: C) Capacitive reactance opposes AC flow and affects phase relationships in circuits. 6. Which of the following is a disadvantage of DC compared to AC in terms of voltage transformation? A) DC cannot be easily transformed to different voltage levels. B) DC is more expensive to produce. C) DC is less stable than AC. D) DC requires more complex infrastructure. Show Answer Correct Answer: A) DC cannot be easily transformed to different voltage levels. 7. A current is said to be alternating when it changes in A) Magnitude. B) Direction. C) Both 'a' and 'b'. D) None of these. Show Answer Correct Answer: C) Both 'a' and 'b'. 8. An inductance of 1 mH a condenser of 10 mF and a resistance of 50 W are connected in series. The reactances of inductor and condensers are same. The reactance of either of them will be ..... A) 100 W. B) 30 W. C) 3.2 W. D) 10 W. Show Answer Correct Answer: D) 10 W. 9. Which of these answer choices below is an example of how a Direct Current obtains its energy? A) Lights. B) Television. C) Computer. D) Battery. Show Answer Correct Answer: D) Battery. 10. The resistance of the primary coil of a well-designed, 1:10 step-down transformer is 1 W. With the secondary circuit open, the primary is connected to a 12 V ac generator. The primary current is: A) Essentially zero. B) About 12 A. C) About 120 A. D) Depends on the actual number of turns in the primary coil. Show Answer Correct Answer: A) Essentially zero. 11. AC generators used to produce alternating current by converting A) Kinetic energy into potential energy. B) Potential energy into electrical energy. C) Kinetic energy into electrical energy. D) Electrical energy into kinetic energy. Show Answer Correct Answer: C) Kinetic energy into electrical energy. 12. The alternating current can be measured with the help of A) Hot wire ammeter. B) Hot wire voltmeter. C) Moving magnet galvanometer. D) Suspended coil type galvanometer. Show Answer Correct Answer: A) Hot wire ammeter. 13. A series LCR circuit connected to an AC source is shown. Write the expression for the impedance offered by this circuit. A) $Z = R + (X_L-X_C)$. B) $Z = \sqrt{R^2 + (X_L-X_C)^2}$. C) $Z = \sqrt{R^2 + X_L^2 + X_C^2}$. D) $Z = R$. Show Answer Correct Answer: B) $Z = \sqrt{R^2 + (X_L-X_C)^2}$. 14. What is the function of a fuse in an AC household circuit? A) To increase current. B) To protect against overload. C) To store energy. D) To convert AC to DC. Show Answer Correct Answer: B) To protect against overload. 15. A power supply has a peak value of 433 Volts sine wave, what is the effective dc voltage of this power supply? A) 306 V. B) 433 V. C) 612 V. D) 220 V. Show Answer Correct Answer: A) 306 V. 16. Find the power loss in the line as heat A) 700 kW. B) 600 kW. C) 650 kW. D) 550 kW. Show Answer Correct Answer: B) 600 kW. ← PreviousRelated 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