Final answer:
The statement is true; disconnecting test leads before changing the function select dial on a multimeter is a crucial safety step to prevent shorts, inaccurate readings, and potential hazards.
Step-by-step explanation:
The statement 'Test leads must be disconnected when changing the function select dial' is true. When using a multimeter to measure electrical values such as voltage, current, or resistance, it is crucial to ensure safety and prevent damage to the equipment.
Changing the function select dial while the test leads are connected can lead to electrical shorts, inaccurate readings, or potentially harmful situations. Therefore, always disconnect the test leads before switching the function of the multimeter. This safety precaution helps to avoid any mishaps that could be caused by a sudden change in measurement modes.