C:-Polyalphabetic substation cipher
D:-None of the above
Correct Answer:- Option-C
Question48:-The following service is not provided by digital signature
A:-Integrity
B:-Authentication
C:-Nonrepudiation
D:-Confidentiality
Correct Answer:- Option-D
Question49:- is a technique of temporarily removing inactive programs from the memory of computer system.
A:-Swapping
B:-Spooling
:-Semaphore
D:-Scheduling
Correct Answer:- Option-A
Question50:-Fence register is used for
A:-CPU protection
B:-Memory protection
-File protection
D:-Processor protection
Correct Answer:- Option-B
Question51:-The clause is used to list the attributes desired in the result of a query.
A:-where
-from
C:-select
D:-having
Correct Answer:- Option-C
Question52:-We express queries in QBE by
A:-Datalog

Skeleton tables
C:-Entity sets
D:-SQL
Correct Answer:- Option-B
Question53:- is a set of permitted values for each attribute.
A:-Domain

-Entity
C:-Constraints
D:-Relationship
Correct Answer:- Option-A
Question54:-Minimal super keys are called
A:-Primary key
B:-Foreign key
C:-Candidate key
D:-Unique
Correct Answer:- Option-C
Question55:-A relation is in , every non-key attribute is irreducibly dependent on the primary key.
A:-1NF
B:-2NF
C:-3NF
D:-4NF
Correct Answer:- Option-B
Question56:-A statement that the system executes automatically when a database related event occurs.
A:-View
-Alter
C:-Assertion
D:-Trigger
Correct Answer:- Option-D
Question57:-An index record appears for every Search key value in the file
A:-Dense index