Q23. Define Base.

Ans. The number of symbols in a number system. Also, one of the three regions in a BJT.



Q22. Define Backplane.

Ans. Electrical connection common to all segments of the LCD.

Functions Performed By An Operating System As Memory Manager

Q16. Explain briefly the functions performed by an operating system as memory manager?

Ans. In the working of a modern computer system, memory plays a central role. Both CPU and Input/output system interact with memory. Memory is a large array of words or bytes, each with its own address. The CPU reads from and writes to specific memory addresses.


Memory Plays a central role in Computer System


Figure: Memory plays a central role in Computer System

A program must be assigned some memory area and loaded into memory in order to be executed. As the program executes, it accesses program instructions and data from memory by generating addresses of the allocated memory. When the program terminates, its memory space is declared free, and the next program may be given the same memory area. There can be many user programs loaded in the memory along with system programs and operating system.



Functions Performed By An Operating System As Processor Manager

Q15.Explain briefly the functions performed by an operating system as processor manager?

Ans. As the name itself suggests, Processor Management means managing the process or processor that is, the CPU. Therefore, this very function is also termed as CPU Scheduling.

Multiprogramming, undoubtedly, improves the overall efficiency of the computer system by getting more work done in less time as the CPU may be shared among a number of active programs which are present in the memory at the same time. While CPU is executing a job, it has to wait for the job; if the job requires certain Input/output operation, the CPU waits for the Input/output operation to get over and that wait time is CPU’s idle time. In place of making CPU sit idle, another job takes over the use of CPU, increasing efficiency thereby and reducing CPU idle time.

The benefits of multiprogramming are as follow:

  • Increased CPU utilization
  • Higher total job throughput