IT &computer MCQ section 7 MCQ Questions & Answers Detailed Explanation

Answer: (b)

Token is an efficient form of message passing frequently used in ring networks. It consists of a very short message that circulates around the ring in a logical direction when devices are idle. To transmit, the device must seize the token. Token provides fair access for all stations, and eliminates the collisions of contention-based access methods.

Answer: (c)

A local area network (LAN) is a computer network that interconnects computers in a limited area such as a home, school, computer laboratory, or office building using network media.

The defining characteristics of LANs, in contrast to wide area networks (WANs), include their usually higher data-transfer rates, smaller geographic area, and lack of a need for leased telecommunication lines.

Answer: (a)

The process is known as index definition. The order in which columns are listed in the index definition is important. A database index is a data structure that improves the speed of data retrieval operations on a database table at the cost of slower writes and increased storage space. Indices can be created using one or more columns of a database table, providing the basis for both rapid random lookups and efficient access of ordered records.

Answer: (b)

Primary Key is a column or a combination of columns that uniquely identify a record. Only one Candidate Key can be Primary Key. For a Candidate Key to qualify as a Primary Key, it should be unique and non-null. So, basically a primary key is just one of the candidate keys, which is a just a minimal super key.

Answer: (b)

LOGO is a computer programming language used for functional programming, and is used for generating basic shapes using a turtle cursor. It was developed for children experimenting their first programming steps. It guides kids step by step with the basics of computers programming.

Answer: (a)

ODBC : Open Database Connectivity