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Oscillations kept going by an external periodic agency are described as:

AFolded
BForced
CFormed
DFramed
Answer & Solution
Correct answer: B. Forced
1. Left alone, a real oscillator gradually stops. 2. An outside driver can keep it going indefinitely. 3. They can be forced to remain oscillating by means of some external periodic agency. 4. So such oscillations are called forced. _Source: syllabus Physics Part II, Ch 13 'Oscillations'_
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