UPSC CSE Prelims
Question 9
Consider the following communication technologies :
- Closed-circuit Television
- Radio Frequency Identification
- Wireless Local Area Network
Which of the above are considered Short-Range devices/technologies ?
View correct answer and explanation
Correct answer: D
Correct Option: D (1, 2 and 3)
Explanation: All three can qualify as short-range technologies: local CCTV links, near-field RFID and Wi-Fi/WLAN typically work within confined premises.
Statement / Pair / Item-wise Analysis:
1. True / qualifies - CCTV transmits video over a limited local/campus network, often via cable or short-range radio.
2. True / qualifies - RFID interrogates tags at short distances depending on frequency and antenna design.
3. True / qualifies - Wi-Fi-based WLANs are designed for local coverage.
Option-wise Analysis:
A. Incorrect-omits 3 even though Wi-Fi-based WLANs are designed for local coverage.
B. Incorrect-omits 1 even though CCTV transmits video over a limited local/campus network, often via cable or short-range radio.
C. Incorrect-omits 2 even though RFID interrogates tags at short distances depending on frequency and antenna design.
D. Correct-selects exactly the correct statements/items identified above.