Question

In domestic Indian house, the values of AC electrical power and frequency we receive are __________.

• A. 220 V and 50 Hz
• B. 240 V and 60 Hz
• C. 240 V and 50 Hz
• D. 220 V and 60 Hz

Hint:

Remember the standard Indian rating:
Voltage = \(220\text{ V}\) AC.
Frequency = \(50\text{ Hz}\).
This is a standard memorization fact for competitive exams.

Answer 1

The Correct Option is A

Step 1: Recognise this as a standard fact.
Every country fixes its own domestic AC supply standard, and this question is simply asking for the value adopted for Indian homes.
Step 2: Recall the Indian standard.
Indian households receive single phase AC supply rated at \(220\) V (RMS) with a frequency of \(50\) Hz, meaning the current reverses direction 100 times every second.
Step 3: Contrast with other systems to avoid mixing them up.
The USA instead uses about \(120\) V at \(60\) Hz, so an option mixing \(240\) V or \(60\) Hz with India is simply blending two different countries standards together.
\[ \boxed{220\text{ V and }50\text{ Hz}} \]