Which waveform has rapid rise followed by linear decay?

• A. Triangle Wave
• B. Sawtooth Wave
• C. Sine Wave
• D. Pulse Wave

Answer: (B)

Understanding how the edge shape of a waveform reveals its identity helps you distinguish common signals. The rapid rise followed by a linear decay describes a waveform that jumps up quickly and then falls at a constant rate back to its starting level. That quick ascent and straight-line downward ramp is the hallmark of a sawtooth pattern. The other waveforms don’t match this combination: a triangle wave has linear ramps both up and down with no abrupt jump, a sine wave changes curvature smoothly rather than in straight-line segments, and a pulse wave features abrupt transitions with flat top/bottom rather than a steady linear decay. So the waveform that fits a fast rise then linear fall is the sawtooth.