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UPSC 2004: Assertion (A): In our houses, the current in AC electricity line changes direction 60 times per second. Reason (R): The frequency of alternating voltage supplied is 60 hertz.
(a)Both A and R are individually true and R is the correct explanation of A
(b)Both A and R are individually true but R is not the correct explanation of A
(c)A is true but R is false
(d)A is false but R is true
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Not attemptedCorrect Answer: (a) Both A and R are individually true and R is the correct explanation of A
Under the convention followed in the question, a 60-hertz (Hz) alternating-voltage supply reverses its polarity 60 times every second; hence the current in the domestic line also reverses 60 times per second. Because R states the same fact and directly explains A, both statements are taken as true and R is the correct explanation of A. (Although India actually uses 50 Hz mains power, the UPSC key treats 60 Hz as the assumed standard for this item). ([scribd.com](https://www.scribd.com/document/732020719/2004-GS1-Set-A-With-Answers))
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Frequently Asked Questions
What is the correct answer to this UPSC 2004 Science & Technology question?▼
The correct answer is option (a): Both A and R are individually true and R is the correct explanation of A. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Physics question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2004, GS Paper 1, as Question 72. It falls under Science & Technology > Physics.
What is the difficulty level of this UPSC question?▼
This question is rated "moderate". It requires sound conceptual understanding of the topic.
How many UPSC Prelims questions have been asked from Physics?▼
UPSC has asked 104 questions from Physics (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.