
IIT JEE : Electromagnetic Induction Electromagnetic Waves QUESTIONS AND ANSWERS :: part4 : 1 to 5
Following IIT JEE Entrance Multiple choice objective type questions and answers will help you in Maths, Physics and Chemistry 2024 examinations :
1.The frequency of ac in India is |
| 50 Hz |
| 50 kHz |
| 1420 MHz |
| 60 kHz |
2.The alternating voltage which we use in house has a peak value of nearly |
| 220 V |
| 280 V |
| 311 V |
| 300 V |
3.A step down transformer reduces 200 V to 110 V. The primary draws 5 amp. of current and secondary supplies 9 ampere. The efficiency of transformer is |
| 90% |
| 80% |
| 60% |
| 70% |
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