Which one of the following search engines is considered the first web search engine in the World Wide Web?

Direction: Consider the following statements about Fibre Optics-
1. Optical fibres are a fine strand of high-quality glass, in which information is transmitted with the help of a light beam.
2. Light is kept in the core of the fibre by total internal reflection.
3. BSNL has the largest optical fibre cable network in India.
4. Fibre-to-Home refers to the optical fibre cable that replaces the standard copper wire of the local Telco.
Which of the statements given above is/are correct?

Direction: Consider the following statements-
1. Ethernet is a family of computer networking technologies for Wide Area Networks (WANs).
2. Besides computers, ethernet can be used to interconnect other appliances and personal devices.
Which of the statements given above is/are correct?

Direction: Match List I (Radio spectrum) with List-II (Frequency Band) and select the correct answer using the codes given below the lists.
List $I$                     List $II$
A. VLF      1. $300$Hz to $3$kHz
B. VHF      2. $3$kHz to $30$kHz
C. ULF      3. $300$ MHz to $3$ GHz
D. UHF      4. $30$ MHz to $300$ MHz

Direction: Consider the following statements-
1. Extranet is a public network that uses Internet protocols network connectivity.
2. Business to Consumer (B2C) is the integral purpose of the extranet private network.
Which of the statements given above is/are correct?

Direction: Consider the following statements-
1. Multi-mode optical fibres are used for long-distance communication links.
2. Single-mode optical fibres are used for most communication links longer less than $500$ metres.
Which of the statements given above is/are correct?

Direction: Match List $I$ (Microwave Bands) with List $II$ (Frequency Ranges) and select the correct answer using the codes given below the lists-
 List $I$                         List $II$

A. C-band                  1. $12$ to$18$ GHz

B. $0$-band                  2. $4$ to $8$ GHz

C. E-band                  3. $60$ to $90$ GHz

D. Ku-band                4. $110$ to $170$ GHz