Top 15 Computer Science Interview Question & Answers - Part 2 | textpound

Top Computer Science Interview Questions & Answers

 computer science interview questions 

 Most commonly asked computer science interview questions and answers

13. What is memory?

The feature of computer to store data and programs temporary and permanently is called memory. Modern computer can store data in digital form for example in the form of 0s and 1s.

14. What is memory cell?

Memory cell is the smallest unit of memory.In digital memory,memory cell is called Bit.

15. What is memory Word?

Memory word is the combination or group of cells in which data is transferred towards CPU.It is also called Byte.

16. what is Byte?

Byte is the standard unit of digital memory capable of storing eight bits.One byte can store one character.

17. what is the difference between Access time and Cycle time?

Access time is the time required for memory device to perform read operation.Cycle time is the time required for memory device to perform both read write operation and then return to its original state ready for the next operation.It always greater than the access time.

18. what is Read Operation?

Read operation is the operation in which data in a specific memory location is sensed and transferred to another location.It is also called fetch operation.

19. what is the difference between RAM and ROM?

RAM
It stands for Random Access Memory.
It can state data and instructions temporary.
We can perform both read and write operations.
It is volatile memory.
The access mechanism is random.
It is a semi conductor chip.


ROM
It stands for Read Only Memory.
It is programmed during manufacturing time and program resides permanently.
We can perform read operation only.
It is a non volatile memory.

20. What are registers?

The small storage areas inside the CPU that hold frequently used data temporarily are called registers.These are high speed and used to store data and instructions during program execution.

21. What is Program Counter?

Program Counter controls the sequence in which the instructions are fetched from the memory. It stores the address of the next instruction to be fetched for execution.

22. What are Buses?

These are set of parallel wires to transfer data, addresses and control signals among parts of
computer system.

23. What is Data Bus?

Data Bus is used to transfer data between parts of computer.It connects CPU ,memory unit and other parts on the motherboard.Data Bus has different bus width.Each line can carry only one bit at a time. A 64 data line bus can transfer 64 bit data.

24. What is Address Bus?

It is used to carry address information from CPU to memory to read and write data. These are uni directional buses.

25. What are Control Unit?

It is the most important part of CPU.It acts as supervisor of the computer.It controls all the parts and coordinates the activities in the computer. The CU also controls the execution of the instructions.It fetches the instructions and data from memory,decodes them and executes the instructions one by one.

26.What are printers?

Printers are output devices which are used to produce hard-copy output.There are two main categories of printers

• Impact printers
• Non-Impact Printers

27. What is the impact printer?

An impact printer is a type printers which works by creating a direct contact between ink ribbon and paper.The ink ribbon is pressed against the paper, marking the page with the appropriate character, dot, line, or symbol.Common examples of impact printers include dot matrix, daisy-wheel printers, and ball printers. Impact printers are most functional in specialized environments where low-cost printing is essential.