Binary addition & Binary Subtraction

Binary addition:

The rules for binary addition are the same as those for any positional number system. One adds the digits column-wise from the right. If the sum is greater than B–1 for base B, a carry into the next column is generated. In the case of binary numbers, a sum greater than one generates a carry. Here is the binary addition table:

List six major steps that you would take in setting up a database for a particular enterprise.

Answer: Six major steps in setting up a database for a particular enterprise are:

•  Define the high level requirements of the enterprise (this step generates a document known as the system requirements specification.)


•  Define a model containing all appropriate types of data and data relationships.

Signed and Unsigned numbers

In mathematics, negative numbers in any base are represented in the usual way, by prefixing them with a "−" sign. However, on a computer, there are various ways of representing a number's sign. Now we discuss the following methods for representing signed numbers in a computer.

Sign-and-magnitude

The first approach for representing a number's sign

List five responsibilities of a database management system.

Q) List five responsibilities of a database management system. For each responsibility, explain the problems that would arise if the responsibility were not discharged.

Answer: A general purpose database manager (DBM) has five responsibilities:

a. interaction with the file manager.

b. integrity enforcement.

c. security enforcement.

d. backup and recovery.

e. concurrency control.

If these responsibilities were not met by a given DBM

List four significant differences between a file-processing system and a DBMS.

Answer: Some main differences between a database management system and a file-processing system are:

• Both systems contain a collection of data and a set of programs which access that data. A database management system coordinates both the physical and the logical access to the data, whereas a file-processing system coordinates only the physical

A.P History for APPSC Exams

Political History of the Satavahanas

The vague, disputed and uncorroborated doubtful evidences form the basis for the history of the Satavahanas. The Jain sources mention Satavahana as the first king in the family. The Kathasaritsagara also contains a story about Satavahana. The Kondapur coins bear the legend 'Sadvahana'. On scriptal grounds this Satavahana is placed close to (either before or contemporaneous with) Simuka, the first