Home > Class 12 Physics > Quizzes > Class 12 Physics Practice Test: Alternating Current
Class 12 Physics Practice Test: Alternating Current
Fast practice, instant feedback. Timer auto-submits when time’s up.
Avg score: 60% • Most missed: “Which among the following is true about transformers?”
Class 12 Physics Practice Test: Alternating Current
Time left 00:00
10 Questions

1. A transformer is used to light 100 W 25 volt lamp from 250 Volt ac mains. The current in the main cable is 0.5 A. Calculate the efficiency of the transformer.
2. In a step-down transformer, the number of turns in the secondary coil is 20 and the number of turns in the primary coil is 100. If the voltage applied to the primary coil is 120 V, then what is the voltage output from the secondary coil?
3. Current remains unchanged in a transformer.
4. Pick out the correct combination for a step-up transformer.
5. Identify the correct combination for a step-down transformer.
6. The efficiency of a transformer is the ratio of output power to input power.
7. Identify the expression for transformation ratio from the following.
8. Which among the following is true about transformers?
9. A transformer has an efficiency of 60% and works at 5kW. If the secondary voltage is 150 V, then what is the secondary current?
10. Which of the following is usually taken to make the core of a transformer?

⚡ Recently practiced quizzes in this topic
Live quiz activity
Class 12 Physics Practice Test: Ampere's Circuital Law Class 12 Physics Practice Test: Coulomb's Law Class 12 Physics Practice Test: Magnetism and Gauss's Law Class 12 Physics: Electrostatic Potential and Capacitance Class 12 Physics Practice Test: Combination of Capacitors Class 12 Physics Practice Test: Cells, EMF and Internal Resistance Class 12 Physics Practice Test: Motional Electromotive Force Class 12 Physics Practice Test: Torque on Current Loop & Magnetic Dipole Class 12 Physics: Current Electricity Class 12 Physics: Charges and Fields
 
❤ If you liked Fatskills, consider supporting us by checking out The Life Manuals You Never Got.

🌈  Our mission is to help improve your scores in any subject and exam withonline quizzes, practice tests, study guides, & advice for students. Since 2018.
About | Explore | User Guide | Topics | Subjects | Doubt Solver | Career Aptitude Test | Answers | Free Tools | OSHA Basics Quiz | What Should We Know?
Privacy | Terms |
Without work one finishes nothing. - Ralph Waldo Emerson
© 2026 Fatskills.com

All trademarks, logos and brand names are the property of their respective owners. All company, product and service names used in this website are for identification purposes only. Use of these names, trademarks and brands does not imply endorsement.