Step 1: Understanding the Concept:
The objective is to identify a Tala (rhythmic cycle) from the provided choices where the initial beat (matra) is designated as 'Khali' (unaccented, indicated by a hand wave) rather than 'Sam' (the primary, accented beat).
Step 2: Detailed Explanation:
Analysis of the given Talas' structures:
- Jhaptal (10 beats): Structure: 2-3-2-3. Accents (Taali) on beats 1, 3, 8. Unaccented beat (Khali) on beat 6. Beat 1 is the accented Sam.
- Rupak (7 beats): Structure: 3-2-2. This is a distinctive and common Tala where the first beat is the Khali. Accents (Taalis) are on beats 4 and 6.
- Dadra (6 beats): Structure: 3-3. Accent (Taali) on beat 1. Unaccented beat (Khali) on beat 4. Beat 1 is the accented Sam.
- Keharwa (8 beats): Structure: 4-4. Accent (Taali) on beat 1. Unaccented beat (Khali) on beat 5. Beat 1 is the accented Sam.
Step 3: Final Answer:
Rupak is the sole Tala among the given options that commences with a Khali on its first beat.