.................. means sending a digital signal over a channel without changing the digital signal to an analog signal.
Baseband transmission
Broadband transmission
Digital transmission
Analog transmission
Correct Answer :
A. Baseband transmission
Related Questions
Which of the following Key is used to represent relationship between the tables?
Primary key
Secondary Key
Foreign Key
None of these
Functional dependencies are generalization of
Relation dependencies
Data dependencies
key dependencies
none of the above
An operation that will increase the length of a list is
insert
modify
lookup
none of the above
Which of the following is a classical approach to database design?
Left Right approach
Right Left approach
Top Down approach
Bottom Up approach
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
Electromagnetic spectrum included in radiowaves are
i) Super High Frequency (SHF)
ii) Very High Frequency (VHF)
iii) Ultra High Frequency (UHF)
iv) High Frequencies (HF)
i, ii and iii only
i, ii and iv only
ii, iii and iv only
i, iii and iv only
A fragmentation is categorized in
1 part
2 part
3 part
4 part
The class based addressing is known as
Classless addressing
Classful addressing
Classified addressing
Classical addressing
Select the incorrect statement
BCNF is stronger than 3NF
Relational algebra is a non-procedural language
Every conflict serializable schedule is view serializable.
none of the above
RAID
Redundant Arrays of Independent Disks
Redundant Arrays of Independent Drives
Redundant Arrays of Interconnected Drives
Redundant Arrays of Interconnected Disks
Tertiary storage
magnetic tape
juke box
optical disk
All of the above
A data manipulation command the combines the records from one or more tables is called
SELECT
PROJECT
JOIN
PRODUCT
Only one communication channel is needed rather than n channels to transmit data between two communicating devices
parallel
serial
analog
digital
A data dictionary contains:
i) The name of all fields in all files.
ii) The data type of all fields in all files.
iii) The width of all fields in all files.
only i)
only i) and ii)
only ii) and iii)
i) ii) iii)
Radio frequencies below ............. are more suitable for omnidirectional applications.
300MHz
1GHz
5GHz
10 GHz
What is the result of the following SQL statement ?
SELECT A.emp_Name, B.ph_num
FROM emp A LEFT OUTER JOIN phone B
ON A. emp_ID = B.emp_ID
A list of employees phone number
A list of all employees that have spouses, with phone number included in the list
A list of all employees names, including the phone number if they have one
Two lists : One list of employees, the other of phone numbers
The statement
Every foreign-key value must match a primary-key value in an associated table
Is related to
View
Cursor defination
Referential intergrity
Trigger
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
The host part in a class A type of an IP address has
12 bits
16 bits
24 bits
28 bits
In this data model each record can hae more than one parent
Hierarchical model
E-R model
Network based model
none of these
Related fields in a database are grouped to form a
data file.
data record.
menu.
bank.
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
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
In an Entity-Relationship Diagram Ellipses represents
Attributes
Weak entity set
Relationship sets
Multi-valued attributes
Which of the following aggregate function doesnt ignore NULLs in its results?
COUNT
COUNT(*)
MAX
none of these
Technique used in log based recovery
Immediate database modification
Graph-based recovery
key dependencies
none of the above
Mail services are available to network users through the
Session layer
Presentation layer
Application layer
Transport layer
A relation is said to be in ………. If it doesnt contain partial dependency
1NF
2NF
3NF
BCNF
Symbol to represent weak entity set in ER Model
Dotted rectangle
Square
Doubly outlined rectangle
Diamond
The maximum number of children in a B-tree of order m is
m+1
m
m-1
m/2