A
1 and 2 only
B
2 and 3 only
C
1 and 3 only
D
1, 2 and 3
Correct answer: (d) 1, 2 and 3
Explanation
- A
1 and 2 only
1 and 2 only. WLAN is also a short-range radio technology.
- B
2 and 3 only
2 and 3 only. CCTV in the SRD/low-power sense is counted here.
- C
1 and 3 only
1 and 3 only. RFID is the classic short-range device.
- D
1, 2 and 3
All three. CCTV, RFID and WLAN are all treated as short-range devices/technologies in this item.
Summary. Official key is (d) all three. Short-range devices cover low-power radio uses: RFID, WLAN, and closed-circuit video links as framed in the question.
PYQ trend
When UPSC asked this
Related PYQs from other years, newest first. Open a question to read it.
-
2020 · Q39 · General Studies · 2 marks
With reference to Visible Light Communication (VLC) technology, which of the following statements are correct? 1. VLC uses electromagnetic spectrum wavelengths 375 to 780 nm. 2. VLC is known as long-range optical wireless communication. 3. VLC can transmit large amounts of data faster than Bluetooth. 4. VLC has no electromagnetic interference. Select the correct answer using the code given below: -
2019 · Q95 · General Studies · 2 marks
In the context of wearable technology, which of the following tasks is/are accomplished by wearable devices? 1. Location identification of a person 2. Sleep monitoring of a person -
2015 · Q32 · General Studies · 2 marks
With reference to 'Near Field Communication (NFC) Technology', which of the following statements is/are correct? 1. It is a contactless communication technology that uses electromagnetic radio fields. 2. NFC is designed for use by devices which can be at a distance of even a metre from each other. 3. NFC can use encryption when sending sensitive information. Select the correct answer using the codes given below