A ________ sound often occurs when metal has been softened by high heat and pressure

A ________ sound often occurs when metal has been softened by high heat and pressure

• A. Buzzing
• B. Squealing
• C. Pinging
• D. Tapping

Answer: (C)

When metal is heated to high temperatures, it becomes softer and more malleable. As it expands, contracts, or relieves internal stresses, it can vibrate briefly and produce a sharp, high-pitched metallic sound—like a ping. That ping is the clearest cue among the options that the metal has been heated enough to soften, which can mean reduced strength and potential failure. The other sounds describe different situations: buzzing is usually electrical or mechanical vibration, squealing comes from friction or bearings, and tapping is a dull, repetitive percussive noise.

When metal is heated to high temperatures, it becomes softer and more malleable. As it expands, contracts, or relieves internal stresses, it can vibrate briefly and produce a sharp, high-pitched metallic sound—like a ping. That ping is the clearest cue among the options that the metal has been heated enough to soften, which can mean reduced strength and potential failure. The other sounds describe different situations: buzzing is usually electrical or mechanical vibration, squealing comes from friction or bearings, and tapping is a dull, repetitive percussive noise.