Computer & Information Technology

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Q30. Which data-communication mode permits both directions, but only one direction to transmit at a time?

[RRB JE, 30 August 2019]

1. Simplex
2. Half-duplex
3. Three-quarters duplex
4. All choices

Answer: B. Half-duplex

Explanation: Half-duplex communication allows either endpoint to send data, but the parties take turns rather than transmit simultaneously. A walkie-talkie is a familiar example. Full duplex permits simultaneous two-way transmission; simplex permits communication in a single direction only.

Q29. What is the full form of the computer character code EBCDIC?

[RRB JE, 29 August 2019]

1. Extended Binary Control Decimal Interchange Code
2. Enhanced Binary Control Data Interchange Code
3. Extended Binary Coded Decimal Interchange Code
4. Enhanced Binary Coded Data Integration Code

Answer: C. Extended Binary Coded Decimal Interchange Code

Explanation: Extended Binary Coded Decimal Interchange Code is an eight-bit character-encoding family associated especially with IBM mainframe systems. Its mapping differs from ASCII, so translation may be needed when exchanging data between EBCDIC-based and ASCII-compatible platforms.

Q28. Computers are applied in communication, transportation and simulation. Which option describes the applicable fields?

[Chhattisgarh Teacher SETE, 11 August 2019]

1. Communication only
2. Transportation only
3. Simulation only
4. All of the above

Answer: D. All of the above

Explanation: Computers support communication through networks and messaging, transportation through navigation and booking systems, and simulation through computational models. These varied applications demonstrate their role as general-purpose information-processing machines across industries, education and scientific research.

Q27. What was the standard maximum file attachment size offered directly by Gmail?

[Chhattisgarh Teacher SETE, 11 August 2019]

1. 25 KB
2. 25 MB
3. 15 MB
4. 50 MB

Answer: B. 25 MB

Explanation: Gmail has generally permitted attachments up to 25 MB for ordinary direct sending, with larger files often shared through cloud-storage links. The figure refers to an attachment limit rather than mailbox capacity. Individual providers may impose additional restrictions.

Q26. A dot-matrix printer is an example of what kind of printer?

[Chhattisgarh Teacher SETE, 11 August 2019]

1. Impact printer
2. Page printer
3. Non-impact printer
4. Spray printer

Answer: A. Impact printer

Explanation: Dot-matrix printers produce characters by striking pins against an inked ribbon and paper. The mechanical impact makes them noisy but allows multipart forms to be printed. Laser and inkjet printers instead use non-impact imaging or ink deposition techniques.

Q25. Which component is often referred to as the brain of a computer?

[CG Vyapam Assistant Teacher, 11 August 2019]

1. ALU
2. Keyboard
3. CPU
4. Monitor

Answer: C. CPU

Explanation: The central processing unit fetches, decodes and executes program instructions. It coordinates calculations, control flow and information exchange. Although an ALU performs arithmetic and logic, the CPU as a whole is commonly described as the computer’s brain.

Q24. At which Indian city is C-DAC, known for the PARAM supercomputer series, based?

[Territorial Army Official Paper II, 28 July 2019]

1. Chennai
2. Pune
3. Bengaluru
4. Kolkata

Answer: B. Pune

Explanation: Pune hosts the Centre for Development of Advanced Computing, associated with the PARAM series of Indian high-performance computers. PARAM 8000 marked an early milestone in indigenous supercomputing. Such systems execute highly parallel scientific and engineering workloads.

Q23. Which among the listed frequencies is used by Wi-Fi networks?

[RRB ALP, 23 January 2019, Shift 1]

1. 2.4 MHz
2. 5 MHz
3. 10 GHz
4. 5 GHz

Answer: D. 5 GHz

Explanation: Wi-Fi has long used the 2.4 GHz and 5 GHz radio bands, with newer standards also incorporating 6 GHz. Frequencies measured in MHz in the distractors are far below the usual bands. Wireless routers select channels within their supported bands.

Q22. Which term denotes support for two-way mobile communication?

[RRB ALP, 23 January 2019, Shift 1]

1. Triplexing
2. Duplexing
3. Simplexing
4. Quadraplexing

Answer: B. Duplexing

Explanation: Duplex communication provides transmission in both directions between two endpoints. Frequency-division duplex uses separate frequency bands, while time-division duplex separates directions in time. Simplex communication permits transmission in only one direction. Mobile networks employ duplexing for two-way exchanges.

Q21. In cellular communication, LTE stands for which expression?

[RRB ALP, 23 January 2019, Shift 1]

1. Long Term Evolution
2. Last Time Evolution
3. Least Time Evolution
4. Long Time Evolution

Answer: A. Long Term Evolution

Explanation: Long Term Evolution is a standard family for high-speed cellular communication and a foundation of 4G mobile broadband. Its specifications were developed under the 3GPP partnership. LTE improved spectral efficiency, latency and data throughput compared with many earlier mobile technologies.