UGC NET COMPUTER SCIENCE

 UGC NET COMPUTER SCIENCE

1.  A  2MB PCM(pulse code modulation) has

31 voice channels & 1 signalling channel.

2. What is Buffering.

Buffering is the process of temporarily storing the data to allow for small variation in device speeds.

3. What is a terminal emulation.

A software that allows a personal computer to pretend as a computer terminal is called as terminal emulation.

4. What is the use of program counter.

A program counter is used to store address of next instruction to be executed.

5. What is the application of FTP.

File Transfer Protocol(FTP) is used to transfer files with user authentication.

6. Piggy backing is a technique used for

Acknowledgement.

7. The 2’s complement of 10 is

10

Reason:

Transform 10 using NOT gate which means 01

Add by 1

 01

+ 1

-----

10

-----

8. Producer consumer problem is an example of

Semaphores

9. What is Agglomeration

Agglomeration is the process of grouping tasks in to larger tasks to improve performance.

10. Cycle stealing is a term related to

DMA(Direct Memory Access).

11. The logic family with least fanout is

RTL

12. IP is presented in which layer of OSI.

Network layer.

13. Context Free Languages are closed under

Union, Kleen, Closure.

14. What is a self join.

A table joined within itself.

15. What is meant by data mining.

Data Mining is the process of extracting previously non known valid and actionable information from large data to make crucial business and strategic decisions.

16. Which error detection method  uses one's complement arithmetic.

Checksum

17. The maximum channel utilization in PURE ALOHA is

18%

18. The maximum channel utilization SLOTTED ALOHA is

36%

19. A mesh topology is characterized by

Highest reliability.

20. The flow of electrons in CRT is controlled by

Control grid

21. The recursively enumerable languages are closed under

Union and intersection

22. What is mono alphabetic substitution.

 A character in the plaintext is always changed to the same character in the ciphertext, regardless of its position in the text.

23. Bresenhan’s line drawing algorithm is most sought because it uses only

Integer Arithmetic.

24. What is meant by critical fusion frequency.

The refresh rate above which a picture stops flickering and fuses into a steady image is called as critical fusion frequency.

25. A network schema allows

Many-Many relationship.