Question

Choose only incorrect statement out of the following

• A. In our houses, we receive AC electric power at 200V and 50 Hz.
• B. Electric power as an AC can be easily transmitted over long distances without much loss of energy.
• C. In India, the AC changes direction after every 1/50 second.
• D. In India, the AC changes direction after every 1/100 second.

Answer 1

The correct option is C

In India, the AC changes direction after every 1/50 second.

The explanation for the correct answer:

1. AC is a current that changes continuously in magnitude and periodically in direction.
2. In India, we receive AC power at a frequency of 50 Hz i.e., 50 complete oscillations per second.
3. In one complete oscillation, the direction changes two times.
4. Thus for 50Hz frequency, the direction of current changes 100 times a second. i.e., after every 1/100 s.
5. Hence the statement that In India, the AC changes direction after every 1/50 second is incorrect.

The explanation for the incorrect answer:

All the other statements A, B, and D are correct.

Hence the answer to our question is option (C).