ITPEC IP April 2019 Question 12

Topic: Computer Component

Among the interface standards (i) through (iv), which of the following contains all and only the standards that do not need a physical connection with cables and the like?

(i)Bluetooth(ii)IEEE 1394(iii)IrDA(iv)USB 3.0

Explanation

(i) Bluetooth and (iii) IrDA — the two wireless interfaces: Bluetooth uses radio waves, IrDA infrared light.

Classify each standard:

  • •(i) Bluetooth: short-range radio communication, about 10 m, no line of sight needed; wireless
  • •(ii) IEEE 1394: a serial bus connecting devices such as video cameras by cable; wired
  • •(iii) IrDA: infrared communication over a short distance, the devices facing each other; wireless
  • •(iv) USB 3.0: a serial bus connecting peripherals by cable; wired

Answer (b)

Why not others:

  • •(a) — includes (ii) IEEE 1394, a wired serial interface
  • •(c) — includes (ii) IEEE 1394 and leaves out Bluetooth
  • •(d) — includes (iv) USB 3.0, a wired serial interface, and leaves out Bluetooth

Key rule: Wireless interfaces: Bluetooth (radio), IrDA (infrared), NFC; wired serial interfaces: USB, IEEE 1394, HDMI.

Computer Component · AI-written, may contain errors

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