Question # 1

_______is a control that enables users to select one option from an associated list; users can also type an option.

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Combo box

Button

Text box

Static area

Which of the following is NOT a feature of Context DFD?

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one process (which represents the entire system)

all sources/sinks (external entities)

data flows linking the process to the sources and sinks (external entities)

sub-processes (which explain and decomposed the major process into small processes)

A ____ relationship exists when an association is maintained within a single entity.

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unary

ternary

binary

weak

A superkey that does not contain a subset of attributes that is itself a superkey is called a ____.

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candidate key

primary key

superkey

secondary key

A collection of concepts that can be used to describe the structure of a database

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Database

DBMS

Data model

Data

Which of the following is NOT a feature of Indexed sequential files?

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Records are stored in sequence and index is maintained

Dense and nondense types of indexes are maintained

Track overflows and file overflow areas can not be ensured.

Cylinder index increases the efficiency

Identify which of the above statements is/are correct.

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Only A

Only B

Only B and C

Only A and B

Laser records data by burning microscopic holes in the surface of the disk with a

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Hard disk

RAM

Optical disk

Floppy disk

Which of the following is not a feature of TRANSACTION?

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Users should be able to regard the execution of each transaction as atomic

Each transaction, run by itself

must preserve the consistency of the database

dependant on other concurrent transactions

The ____ constraint specifies whether each entity supertype occurrence must also be a member of at least one subtype

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specialization

uniqueness

inheritance

completeness

A super key that does not contain a subset of attributes that is itself a super key is called a ____.

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candidate key

primary key

superkey

secondary key

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