Which technique describes a tremolo-like effect on two adjacent strings?

• A. ondule
• B. detache
• C. sul ponticello
• D. martele

Answer: (A)

Ondule describes a tremolo-like effect produced by rapidly alternating the bow between two neighboring strings, creating a continuous, shimmering texture. By moving the bow back and forth across those two strings in quick, even pulses, the sound remains smooth and sustained rather than forming discrete notes. This contrasts with detache, which uses separate bow strokes on a single string and yields distinct notes; sul ponticello, played near the bridge, changes tone quality to a brighter, glassier sound; and martele, a hammered, heavy stroke often on one string, emphasizes strong attacks. So the technique that produces a tremolo-like effect across two adjacent strings is ondule.