Final answer:
Flexible appliance connectors should not be cut as it may compromise their safety; this is false. High-voltage wires are not insulated; this is false. Tension in a connector being a result of opposite forces is true, and refraction is useful in fiber optic cables for signal transmission; this is true.
Step-by-step explanation:
To answer the question about flexible appliance connectors: they often have a specific length and are manufactured to meet safety standards, which includes having the proper insulation and connections to prevent gas leaks or electrical fires. As such, cutting a flexible appliance connector could compromise its integrity and is therefore typically not recommended. The answer to the question, 'A flexible appliance connector can be cut?' is b. False.
Another point to clarify is the statement about high-voltage wires. High-voltage wires seen on tall metal-frame towers are indeed held aloft by insulating connectors, but they are not wrapped in an insulating material; instead, they are bare to allow for less impedance to the flow of electricity. So the answer to the statement would be b. False. Tension in a connector, as in a string, rope, chain, or cable, is a force that acts along the length of the connector and is responsible for the transmission of force. Tension is indeed a result of opposite forces pulling each point of a connector apart in a direction parallel to its length. Therefore, the answer is a. True.
Lastly, refraction, which is the bending of light as it passes from one medium to another, is indeed useful in fiber optic cables for transmitting signals. So, the answer to whether refraction is useful in fiber optic cables is b. True. Refraction allows signals to be transmitted with low loss and high speed over great distances.