[{"id":17621,"question":"Remak RX 32 three-axis servo robot fits machine up to","choices":[{"text":"100 tons","value":"A"},{"text":"200 tons","value":"B"},{"text":"300 tons","value":"C"},{"text":"400 tons","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":17620,"question":"E-commerce involves:","choices":[{"text":"Electronic funds transfer","value":"A"},{"text":"Orders management","value":"B"},{"text":"Online marketing","value":"C"},{"text":"All of the above","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":17619,"question":"External modems","choices":[{"text":"are expensive","value":"A"},{"text":"Have more operational features","value":"B"},{"text":"Offer high transmission speed","value":"C"},{"text":"All of the above","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":17568,"question":"A modem","choices":[{"text":"Converts analog signals into digital signals","value":"A"},{"text":"Converts  digital signals into analog signals","value":"B"},{"text":"Connects a computer in a LAN","value":"C"},{"text":"Both a and b above","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":17564,"question":"All of the following are true of the simplex mode except","choices":[{"text":"A sender can only send signals","value":"A"},{"text":"It is the most commonly used communication mode","value":"B"},{"text":"Receiver can only receiver signals","value":"C"},{"value":"D"},{"value":"E"}],"correctAnswer":2},{"id":17559,"question":"Propagation of signals across a communication medium is known as","choices":[{"text":"Signaling","value":"A"},{"text":"Transmission","value":"B"},{"text":"Broadcasting","value":"C"},{"text":"Dissemination","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":17554,"question":"In data communication the sender is also called","choices":[{"text":"Object","value":"A"},{"text":"Source","value":"B"},{"text":"Sink","value":"C"},{"text":"Medium","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":17551,"question":"A system in which data can be received and sent simultaneously is called","choices":[{"text":"Simplex","value":"A"},{"text":"Half duplex","value":"B"},{"text":"Full-duplex","value":"C"},{"text":"Multi-duplex","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":17546,"question":"The cables that consists of tubes of glass through which data are transmitted as pulses of light is","choices":[{"text":"Twisted pair","value":"A"},{"text":"Coaxial cable","value":"B"},{"text":"Fiber optic","value":"C"},{"text":"None of the above","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":17541,"question":"The fastest mode of data transmission is","choices":[{"text":"Simplex","value":"A"},{"text":"Half duplex","value":"B"},{"text":"full-duplex","value":"C"},{"text":"None of the above","value":"D"},{"value":"E"}],"correctAnswer":1}]