The physical path over which a message travels
Thermal
Medium
Protocol
Impulse
Correct Answer :
B. Medium
Related Questions
Which of the following operator preserves unmatched rows of the relations being joined?
Inner join
Outer join
union
Intersect
Tertiary storage
magnetic tape
juke box
optical disk
All of the above
The method by which the structure of the database is modified to eliminate hidden dependencies and replacing groups is
Normalization
Indexing
Enforcing referential integrity
Enforcing data integrity
An operation that will increase the length of a list is
insert
modify
lookup
none of the above
The left outer join takes all tuples
in the left relation which didnt match with any tuple in right relation
in the left relation which matched with a tuple in right relation
in the right relation which didnt match with any tuple in left relation
in the right relation which matched with a tuple in left relation
DBMS helps achieve
Data independence
Centralized control of data
Neither A) nor B)
both A) and B)
Repeaters operate in
i) Physical layer
ii) Datalink layer
iii) Transport layer
iv) Network layer
i and ii only
ii and iii only
ii only
i only
Triggers are also called
active rules
passive rules
inferences
none of the above
An advantage of the database management approach is
data is dependent on programs.
data redundancy increases.
data is integrated and can be accessed by multiple programs.
none of the above.
Disk storage is referred to as
sequential access storage
direct access storage
random access storage
none of the above
Unwanted energy from source other than the transmitter.
Attenuation
Distortion
Delay
Noise
Database locking concept is used to solve the problem of
Lost Update
Uncommitted Dependency
Inconsistent Data
All of the above
Encoding method which does not provide for synchronization
B8ZS
Manchester
RZ
NRZ-L
Which of the following is also known as Offline storage ?
primary storage
secondary storage
tertiary storage
none of the above
Which of the following is/are error-free channel(s)
i) Noisy channel
ii) Noiseless channel
i only
ii only
Both
None of these
The output of the Data Definition Language is stored in the
view table
schema
metadata
all of the above.
In the architecture of a database system external level is the
physical level.
logical level.
conceptual level
view level.
In an object oriented model, one object can access data of another object by passing?
Instance variable
Variable
Message
Function
A composite attribute is converted to individual attributes in which of the following normal form ?
first
Second
third
fourth
The ________ states that a foreign key must either match a primary key value in another relation or it must be null.
entity integrity rule
referential integrity constraint
composite attribute
action assertion
A transaction which may not complete its execution successfully is termed as
Failed
Aborted
Blocked
Finished
A relation is said to be in ………. If it doesnt contain partial dependency
1NF
2NF
3NF
BCNF
Which of the following is not a constraint on a single relation?
check
unique
not null
is duplicate
Authorization command in SQL
Allow
Access
Grant
none of the above
DECLARE is a(an)
executable statement.
declarative statement.
Ordered file
none of the above
The raw facts and figures are:
Data
Data field
DBMS
DBASE
The union of primary keys of a related entity becomes …………. Of a relation.
primarykey
superkey
candidatekey
foreignkey
Range variables are designed using the
TO clause
FROM clause
RANGE clause
none of the above
Which of the following works as a filter?
UPDATE
DROP
ALTER
SELECT
Radio frequencies below ............. are more suitable for omnidirectional applications.
300MHz
1GHz
5GHz
10 GHz