Which of the following statements is true about impulse or impact noise?

The statement that impulse or impact noise comes in very loud and short bursts is accurate because this type of noise results from a sudden release of energy. Examples include sounds generated from actions like hammering, slamming doors, or explosions. These noises are brief and often characterized by a high peak sound level that occurs over a very short duration, making them distinct from continuous noise types that maintain a steady volume over time. Understanding this characteristic is crucial when addressing noise control measures and protecting hearing, especially in work environments where such bursts can be frequent.

The other statements do not accurately describe the nature of impulse or impact noise; for example, it does not maintain a consistent volume level, cannot always be easily measured by standard sound meters due to its briefness, nor is it exclusively produced by heavy machinery, as many impulse noises can arise from everyday activities.