वॉकी-टॉकी (Walkie-talkie) किस प्रकार के संचार चैनल का एक उदाहरण है?

Which of the following signals/waves is used for short-range communication in a closed area using line-of-sight propagation?

Which error detection mechanism uses a single extra bit added to data to detect single-bit errors?

The process of transmitting information simultaneously from a single source to multiple specific internet-connected devices or recipients is known as:

Which switching technique establishes a dedicated physical path between source and destination nodes through intermediate nodes of a communication network?

Which of the following statements is/are correct regarding the structure of a Quick Response (QR) code? (i) Position Markers (Finder Patterns): Located in three corners of the QR code. (ii) Alignment Markers: Smaller squares with a central dot, used to correct distortions. (iii) Quiet Zone: A white border surrounding the QR code. (iv) Version Information: Found near the top-right and bottom-left of the QR code.