Q. What is the role of a bypass capacitor in a series circuit with an op-amp?
A.
To increase gain
B.
To filter out noise
C.
To decrease output impedance
D.
To stabilize voltage
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Solution
A bypass capacitor is used to filter out noise in a series circuit with an op-amp, improving the stability and performance of the circuit.
Correct Answer:
B
— To filter out noise
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Q. What is the role of a capacitor in an integrated circuit?
A.
To amplify signals
B.
To store electrical energy
C.
To provide a path for current
D.
To regulate voltage
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Solution
Capacitors in integrated circuits are used to store electrical energy temporarily, smoothing out voltage fluctuations.
Correct Answer:
B
— To store electrical energy
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Q. What is the role of a coupling capacitor in amplifier circuits?
A.
To block DC and allow AC signals
B.
To amplify the signal
C.
To provide feedback
D.
To increase bandwidth
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Solution
A coupling capacitor blocks DC while allowing AC signals to pass, which is essential in amplifier circuits.
Correct Answer:
A
— To block DC and allow AC signals
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Q. What is the role of a data mart in a data warehousing environment?
A.
To store all enterprise data
B.
To provide a subset of data for specific business areas
C.
To manage data integrity
D.
To perform data cleansing
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Solution
A data mart provides a subset of data tailored for specific business areas or departments.
Correct Answer:
B
— To provide a subset of data for specific business areas
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Q. What is the role of a database management system (DBMS)?
A.
To create hardware for data storage
B.
To manage data and provide an interface for users
C.
To perform data analysis only
D.
To ensure data is stored in a non-volatile manner
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Solution
A DBMS manages data and provides an interface for users to interact with the database.
Correct Answer:
B
— To manage data and provide an interface for users
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Q. What is the role of a dimension table in a data warehouse?
A.
To store transactional data
B.
To provide context to fact data
C.
To manage user access
D.
To perform data cleansing
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Solution
Dimension tables provide context to the fact data, allowing users to analyze the facts in relation to various attributes.
Correct Answer:
B
— To provide context to fact data
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Q. What is the role of a distributed transaction manager?
A.
To manage data replication
B.
To ensure ACID properties across distributed transactions
C.
To optimize query performance
D.
To handle user authentication
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Solution
A distributed transaction manager ensures that ACID properties are maintained across transactions that span multiple nodes in a distributed database.
Correct Answer:
B
— To ensure ACID properties across distributed transactions
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Q. What is the role of a FET in a series-parallel circuit?
A.
To provide high input impedance
B.
To amplify AC signals only
C.
To act as a current source only
D.
To rectify AC signals
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Solution
FETs are known for their high input impedance, making them suitable for various applications in series-parallel circuits.
Correct Answer:
A
— To provide high input impedance
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Q. What is the role of a foreign key in a relational database?
A.
To uniquely identify a record
B.
To establish a relationship between two tables
C.
To enforce data integrity
D.
To improve query performance
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Solution
A foreign key is used to establish a relationship between two tables by referencing the primary key of another table.
Correct Answer:
B
— To establish a relationship between two tables
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Q. What is the role of a fuse in a programmable logic device?
A.
To amplify signals
B.
To store data
C.
To create permanent connections
D.
To rectify AC signals
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Solution
Fuses in PLDs are used to create permanent connections in the logic array after programming.
Correct Answer:
C
— To create permanent connections
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Q. What is the role of a multiplexer in MSI circuits?
A.
To perform addition
B.
To select data from multiple sources
C.
To store data
D.
To amplify signals
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Solution
A multiplexer selects data from multiple input sources and forwards it to a single output line.
Correct Answer:
B
— To select data from multiple sources
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Q. What is the role of a routing protocol?
A.
To encrypt data packets
B.
To determine the best path for data
C.
To manage user authentication
D.
To provide a physical connection
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Solution
Routing protocols determine the best path for data packets to travel through a network.
Correct Answer:
B
— To determine the best path for data
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Q. What is the role of a switch in a WAN environment?
A.
To connect multiple networks
B.
To filter and forward data packets within a network
C.
To provide internet access
D.
To manage IP addresses
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Solution
In a WAN environment, switches connect multiple networks and facilitate communication between them.
Correct Answer:
B
— To filter and forward data packets within a network
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Q. What is the role of a transaction in a database?
A.
To group multiple operations
B.
To create a backup
C.
To optimize queries
D.
To enforce data types
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Solution
A transaction groups multiple operations into a single unit of work, ensuring all or none are executed.
Correct Answer:
A
— To group multiple operations
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Q. What is the role of a transaction in an Object-Oriented Database?
A.
To define the structure of objects
B.
To ensure data consistency and integrity
C.
To create indexes
D.
To manage user permissions
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Solution
Transactions ensure data consistency and integrity by grouping operations that must all succeed or fail together.
Correct Answer:
B
— To ensure data consistency and integrity
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Q. What is the role of a transaction manager in a distributed database?
A.
To manage data replication
B.
To ensure ACID properties across distributed transactions
C.
To handle user authentication
D.
To optimize query performance
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Solution
The transaction manager in a distributed database ensures that ACID properties (Atomicity, Consistency, Isolation, Durability) are maintained across distributed transactions.
Correct Answer:
B
— To ensure ACID properties across distributed transactions
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Q. What is the role of a voltage divider in interfacing?
A.
To increase voltage levels
B.
To decrease voltage levels
C.
To filter noise
D.
To convert AC to DC
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Solution
A voltage divider is used to decrease voltage levels to a desired value suitable for interfacing with other components.
Correct Answer:
B
— To decrease voltage levels
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Q. What is the role of a Zener diode in a circuit?
A.
To rectify AC signals
B.
To regulate voltage
C.
To amplify signals
D.
To switch circuits
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Solution
Zener diodes are used for voltage regulation, allowing current to flow in the reverse direction when a specific voltage is reached.
Correct Answer:
B
— To regulate voltage
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Q. What is the role of an attribute in an ER model?
A.
To represent a relationship
B.
To define the properties of an entity
C.
To serve as a primary key
D.
To enforce data integrity
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Solution
An attribute defines the properties or characteristics of an entity in an ER model.
Correct Answer:
B
— To define the properties of an entity
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Q. What is the role of an ER model in distributed databases?
A.
To define the physical storage of data
B.
To represent the logical structure of the database
C.
To manage user access and permissions
D.
To optimize query performance
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Solution
The ER model represents the logical structure of the database, which is essential for designing distributed databases.
Correct Answer:
B
— To represent the logical structure of the database
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Q. What is the role of an FET in a series-parallel circuit?
A.
To provide high input impedance
B.
To increase current flow
C.
To decrease voltage levels
D.
To act as a voltage regulator
Show solution
Solution
FETs are known for their high input impedance, making them suitable for various applications in circuits.
Correct Answer:
A
— To provide high input impedance
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Q. What is the role of an index in a database?
A.
To store XML data
B.
To speed up data retrieval
C.
To enforce data integrity
D.
To manage transactions
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Solution
An index is used to speed up data retrieval operations on a database table.
Correct Answer:
B
— To speed up data retrieval
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Q. What is the role of an operational amplifier (op-amp) in a memory circuit?
A.
To store data
B.
To amplify voltage signals
C.
To rectify AC signals
D.
To provide a reference voltage
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Solution
Op-amps are used in memory circuits primarily to amplify voltage signals, which is crucial for signal processing.
Correct Answer:
B
— To amplify voltage signals
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Q. What is the role of an operational amplifier (op-amp) in memory circuits?
A.
To store data
B.
To amplify voltage signals
C.
To rectify AC signals
D.
To switch between memory states
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Solution
Op-amps are used in memory circuits primarily to amplify voltage signals, which is crucial for signal processing.
Correct Answer:
B
— To amplify voltage signals
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Q. What is the role of an operational amplifier in a parallel circuit configuration?
A.
To increase voltage
B.
To amplify current
C.
To provide feedback
D.
To act as a switch
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Solution
An operational amplifier in a parallel circuit configuration is often used to provide feedback, which can stabilize and control the circuit's behavior.
Correct Answer:
C
— To provide feedback
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Q. What is the role of attributes in an ER model?
A.
To define relationships
B.
To provide additional information about entities
C.
To serve as primary keys
D.
To represent constraints
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Solution
Attributes provide additional information about entities in an ER model.
Correct Answer:
B
— To provide additional information about entities
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Q. What is the role of indexing in a data warehouse?
A.
To ensure data integrity
B.
To speed up query performance
C.
To normalize data
D.
To manage user access
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Solution
Indexing in a data warehouse is used to speed up query performance by allowing faster data retrieval.
Correct Answer:
B
— To speed up query performance
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Q. What is the role of Java Server Pages (JSP) in web applications?
A.
To manage database connections
B.
To create dynamic web content
C.
To handle server-side scripting
D.
To store data in a database
Show solution
Solution
Java Server Pages (JSP) are used to create dynamic web content by embedding Java code in HTML pages.
Correct Answer:
B
— To create dynamic web content
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Q. What is the role of the base-emitter junction in a BJT?
A.
To provide thermal stability
B.
To allow current flow when forward-biased
C.
To block current flow when reverse-biased
D.
To amplify the output signal
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Solution
The base-emitter junction allows current flow when forward-biased, enabling the transistor to operate.
Correct Answer:
B
— To allow current flow when forward-biased
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Q. What is the role of the Bridge Protocol Data Unit (BPDU) in STP?
A.
To carry user data
B.
To manage routing tables
C.
To share information about the network topology
D.
To encrypt data
Show solution
Solution
BPDUs are used by STP to share information about the network topology and help in loop prevention.
Correct Answer:
C
— To share information about the network topology
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