Piezoelectric materials serve as a source of A) Resonant waves B) Musical waves C) Microwaves D) Ultrasonic waves Related MCQs: The …….. perspective draws on the ways in which human mental abilities serve adaptive purposes. Spark plug makes use of which of the following materials for insulation Materials for rain proof coats and tents owe their water proof properties to? Tests involving the construction of certain patterns or solving problems in terms of concrete materials are called?