Computer science – Online Exam

Welcome to your Computer Science

A computer virus that actively attacks an anti-virus program or programs in an effort to prevent detection is:

Worm

Retrovirus

Trojan

Ghost virus

What is the purpose of CSS?

To define the style and appearance of a web page.

To define the structure and content of a web page.

To add interactivity to a web page.

To connect a web page to a database.

What is the primary purpose of HTML?

To define the structure and content of a web page.

To define the style and appearance of a web page.

To add interactivity to a web page.

To connect a web page to a database.

What are the four pillars of object-oriented programming?

Encapsulation, abstraction, inheritance, and polymorphism.

Abstraction, inheritance, polymorphism, and composition.

Encapsulation, abstraction, polymorphism, and aggregation.

Encapsulation, inheritance, composition, and polymorphism.

What is the difference between a stack and a queue?

A stack is a last-in-first-out (LIFO) data structure, while a queue is a first-in-first-out (FIFO) data structure.

A stack is a data structure that is used to store data in a reverse order, while a queue is a data structure that is used to store data in the order in which they are added.

A stack is a data structure that is used to store data in a temporary way, while a queue is a data structure that is used to store data in a permanent way.

A stack is a data structure that is used to store data that is frequently accessed, while a queue is a data structure that is used to store data that is infrequently accessed.

What are the three main types of database models?

Relational, hierarchical, and network.

Relational, NoSQL, and object-relational.

Object-oriented, entity-relationship, and NoSQL.

Document, graph, and key-value.

What are the three main types of algorithms?

Greedy algorithms, dynamic programming algorithms, and backtracking algorithms.

Sorting algorithms, searching algorithms, and graph algorithms.

Divide-and-conquer algorithms, brute-force algorithms, and randomized algorithms.

Sorting algorithms, searching algorithms, and hashing algorithms.

What is the primary function of the central processing unit (CPU)?

To perform arithmetic and logical operations.

To control the flow of data within the computer system.

To store data and instructions.

To connect the different components of the computer system.

What is the difference between a process and a thread?

A process is a running program, while a thread is a lightweight process.

A process is a static entity, while a thread is a dynamic entity.

A process is a single unit of execution, while a thread is a multiple unit of execution.

A process is a visible entity, while a thread is not visible.

10.

What is the difference between a primary key and a foreign key?

A primary key is a column that uniquely identifies each row in a table, while a foreign key is a column that references the primary key of another table.

A primary key is a column that is required in each row of a table, while a foreign key is a column that can be null.

A primary key is a column that has a unique value in each row of a table, while a foreign key is a column that can have multiple values in each row of a table.

A primary key is a column that is used to index a table, while a foreign key is used to enforce referential integrity between tables.

11.

What is the time complexity of a linear search algorithm?

O(1)

O(log n)

O(n)

O(n^2)

12.

What is the difference between a class and an object?

A class is a blueprint for creating objects, while an object is an instance of a class.

A class is a collection of data and code, while an object is a physical realization of a class.

A class is a static entity, while an object is a dynamic entity.

A class is a theoretical concept, while an object is a concrete entity.

13.

What is a variable?

A named location in computer memory that can store a value.

A sequence of instructions that a computer follows to perform a task.

A set of data that is used by a computer program.

A program that is used to create other programs.

14.

What is the term for a temporary storage area that compensates for differences in data rate and data flow between devices?

Buffer

Bus

Channel

Modem

15.

What is a data type?

A way to classify data in a computer program.

A specific value that can be stored in a variable.

A variable that can store multiple values.

A function that can be used to manipulate data.

16.

What is the purpose of a router in a computer network?

To connect different networks together.

To forward packets of data between networks.

To filter traffic between networks.

To provide security for networks.

17.

What is the difference between a firewall and an intrusion detection system (IDS)?

A firewall is a network security device that monitors and controls incoming and outgoing network traffic, while an IDS is a network security device that monitors network traffic for suspicious activity.

A firewall is a preventative security device, while an IDS is a detective security device.

A firewall is a hardware device, while an IDS can be a hardware or software device.

A firewall is used to protect a network from external threats, while an IDS is used to protect a network from internal threats.

18.

What are the three main phases of the software development life cycle (SDLC)?

Requirements gathering, analysis, and design; implementation and testing; deployment and maintenance.

Requirements gathering, analysis, and design; implementation and testing; deployment and support.

Requirements gathering, analysis, and design; implementation and testing; operation and maintenance.

Requirements gathering, analysis, and design; implementation and testing; operation and support.

19.

What are the two main types of memory in a computer system?

Main memory and secondary memory.

Primary memory and secondary memory.

Internal memory and external memory.

Cache memory and main memory.

20.

What are the two main types of operating systems?

General-purpose operating systems and special-purpose operating systems.

Single-user operating systems and multi-user operating systems.

Single-task operating systems and multi-task operating systems.

Real-time operating systems and non-real-time operating systems.

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