Suppose a disk has 201 cylinders, numbered from 0 to 200. At some time the disk arm is at cylinder 100, and there is a queue of disk access requests for cylinders 30, 85, 90, 100, 105, 110, 135 and 145. If Shortest-Seek Time First (SSTF) is being used for scheduling the disk access, the request for cylinder 90 is serviced after servicing ____________ number of requests.

An operating system uses the Banker’s algorithm for deadlock avoidance when managing the allocation of three resource types X, Y, and Z to three processes P0, P1, and P2. The table given below presents the current system state. Here, the Allocation matrix shows the current number of resources of each type allocated to each process and the Max matrix shows the maximum number of resources of each type required by each process during its execution. There are 3 units of type X, 2 units of type Y and 2 units of type Z still available. The system is currently in a safe state. Consider the following independent requests for additional resources in the current state:

REQ1: P0 requests 0 units of X, 0 units of Y and 2 units of Z
REQ2: P1 requests 2 units of X, 0 units of Y and 0 units of Z

Which one of the following is TRUE?

Consider the following program in C language:

#include < stdio.h >
main()
{
int i;
int *pi = &i;
scanf("%d", pi);
printf("%d\n", i + 5);
}

Which one of the following statements is TRUE?

Match the following:
$$1)$$ Waterfall model
$$2)$$ Evolutionary model
$$3)$$ Component-based software engineering
$$4)$$ Spiral development

$$a)$$ Specifications can be developed incrementally
$$b)$$ Requirements compromises are inevitable
$$c)$$ Explicit recognition of risk
$$d)$$ Inflexible partitioning of the project into