3i Infotech Placement: Sample Questions 208 - 210 of 1245

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Question 208

Edit

Describe in Detail

Essay▾

What is E-R model?

Explanation

  • An entity-relationship model (ER model) is a systematic way of describing and defining a business process.
  • An ER model is typically implemented as a database.
  • The main components of E-R model are: entity set and relationship set.

    The geometric shapes and their meaning in an E-R Diagram -

    • Rectangle: Represents Entity sets.
    • Ellipses: Attribute
    • Diamond: Relationship Set
    • Lines: They link attributes to Entity Sets and Entity sets to Relationship Set
    • Double Ellipses: Multivalued Attributes
    • Dashed Ellipses: Derived Attributes
    • Double Rectangles: Weak Entity Sets
    • Double Lines: Total participation of an entity in a relationship set

A sample E-R Diagram:

The Sample of E-R Diagram

Question 209

Edit

Describe in Detail

Essay▾

List areas where data structures are applied extensively?

Explanation

  • Compiler Design
  • Operating System
  • Database Management System
  • Statistical analysis package
  • Numerical Analysis
  • Graphics
  • Artificial Intelligence
  • Simulation

Question 210

Question

MCQ▾

A software that allows a personal computer to pretend as a computer terminal is

Choices

Choice (4)

a.

bulletin board

b.

terminal emulation

c.

terminal adapter

d.

modem

Answer

b.

Explanation

Define Terminal Emulation
  • A software that allows a personal computer to pretend as a computer terminal is terminal emulation
  • A terminal emulator replicates the functionality of classic computer terminal.
  • Such terminal consists of a monitor and a keyboard, to access another computer, such as a minicomputer or a mainframe.
  • The terminal emulator performs this same functionality in software by providing a separate program with a window to the user.
  • The two systems (local and remote) need not be running the same operating system.

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