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Two Sounds Meet, and One of Them Changes
संधि is the sound change that happens when the last letter of one word meets the first letter of the next and the two fuse into a single word: विद्या + आलय = विद्यालय. Pulling the joined word back apart is संधि-विच्छेद, and that is what papers actually ask for.
The distinction that decides the most marks: संधि joins वर्ण (letters); समास joins शब्द (whole words). In sandhi the letters themselves change — देव + इन्द्र becomes देवेन्द्र, and a brand-new ए appears that was in neither word. In samas nothing changes: राजपुत्र is simply राजा and पुत्र set side by side.
There are exactly three families:
Name the family first. The rule follows almost automatically.
1. What is the correct sandhi-viched (split) of महेश?
2. सूर्योदय का संधि-विच्छेद है
3. अत्यधिक का संधि-विच्छेद है
4. नायक का संधि-विच्छेद है
5. मनोरथ का संधि-विच्छेद है
6. उद्धार का संधि-विच्छेद है
7. एकैक (एक + एक) is an example of which sandhi?
8. Which of the following is a समास, not a संधि?