In which of the following transmissions, we can send data by grouping n bits at a time instead of a single bit?
parallel
serial
analog
digital
Correct Answer :
A. parallel
Related Questions
Full form of CIDR
Classful Inter Domain Routing
Classless International Domain Routing
Classless Inter Domain Routing
none of these
A table that displays data redundancies yields ____________ anomalies
Insertion
Deletion
Update
All of the above
Select the correct
i) A timestamp-based scheduler cant produce live lock
ii) Aggregate functions cant appear with HAVING clause.
iii) Isolation is a property of database transaction.
i and ii only
ii and iii only
i and iii only
i only
.................. occurs due to velocity of propagation the frequency varies. Thus various frequency components of a signal arrive at the receiver at different times.
Noise
Delay distortion
Attenuation distortion
Dispersion
The types of noiseless channels are
i) Selective Reject ARQ
ii) simplest protocol
iii) Go-Back-N ARQ
iv) Stop-and-Wait Protocol
i, ii only
ii and iv only
ii and iv only
i, iv only
An association of several structure of a data base can be expressed graphically by?
Tuple
Record
Relationship
Field
Primary storage
magnetic disk
magnetic tape
juke box
cache
Relational Algebra is
Data Definition Language.
Data Manipulation Language
Procedural query Language
None of the above
Generalization is a
top-down approach.
bottom-up approach.
left-right approach.
none of the above
Event condition action model is related to
Views
Cursors
Triggers
None of these.
A relation is said to be in ………. If it doesnt contain partial dependency
1NF
2NF
3NF
BCNF
EEPROM
Electrically Extractable Programmable Read Only Memory
Electrically Erasable Programmable Read Only Memory
Electronically Erasable Programmable Read Only Memory
Electrically Erasable Programmable Read Only Memory
Which of the following are the properties of entities?
Groups
Table
Attributes
Switchboards
Symbol to represent weak entity set in ER Model
Dotted rectangle
Square
Doubly outlined rectangle
Diamond
The degree of the table with 500 rows and 7 columns is
500
7
3500
none of these
Attenuation can be also expressed in decibel dB) and commonly used because.
i) Signal strengths often fall off logarithmically
ii) Cascade losses and gains can be calculated with simple additions and subtractions
i only
ii only
Both A and B
None of the above
The exists construct returns the value true, if the argument subquery is
empty
nonempty
contains null values
none of the above
FDDI protocol operates in
i) Transport layer
ii) Network layer
iii) Datalink layer
iv) Physical layer
i and ii only
ii and iii only
i and iii only
iii and iv only
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
Which of the following is true statement ?
SQL permits attribute names to be repeated in the same relation.
a SQL query automatically eliminates duplicates.
a SQL query will not work if there are no indexes on the relations
None of these
The index table has …… Columns.
1
2
3
4
The access protocol used by traditional Ethernet
CSMA/CA
CSMA/CD
CSMA
Token ring
In case of entity integrity, the primary key may be
not Null
Null
both Null & not Null.
any value.
Which of the following layer uses trailer of the frame for error detection?
Transport layer
Network layer
Datalink layer
None of these
In an Entity-Relationship Diagram Diamonds represents
Attributes
Multi-valued attributes
Weak entity set
Relationship sets
Size of source and destination address in IP header
4 bits
8 bits
12 bits
32 bits
In ………… paging we make copy of the current page table.
physical
logical
shadow
duplicate
Multivalued dependency is removed in
4 NF
3 NF
2 NF
1 NF
Transaction access data using two operations
read(), print()
read(), write()
scan(), write()
none of the above
By default a user who has been granted some form of authorization
is allowed to pass them to others
is not allowed to pass them to others
may be or may not be allowed to pass them to others
none