What is the main advantage of dictionary-based compression techniques?

It reduces the size of the message significantly.

It eliminates the need for encryption.

It increases the complexity of the message.

It requires more storage space.

What is a key in the context of encryption?

The secret information used to lock or unlock the message

The method used to encrypt data

How does the Caesar cipher work?

By shifting the letters of the alphabet by a given number of characters

By reversing the order of letters

By replacing each letter with a number

By using a complex mathematical algorithm

What is the Vernam cipher known for?

Being the first cipher invented

What is a one-time pad?

An encryption key that is random and used only once

A type of paper used for encryption

A key that is shorter than the plaintext

A method of decrypting messages

What is the main advantage of using symmetric (private key) encryption?

B) The same key is used for both encryption and decryption. Fast and easy to operate

A) It uses two separate keys for encryption and decryption.

C) It is impossible to intercept the key.

D) It does not require key exchange.

Why is a truly random sequence important in cryptanalysis and perfect security?

B) It ensures the key is mathematically impossible to break.

C) It is generated by a computer.

D) It is always the same for every encryption.

What is a potential risk of asymmetric (public key) encryption?

C) A message can be encrypted by a malicious third party.

A) The public key is kept secret.

B) The private key can be easily deduced from the public key.

D) It does not require digital signatures.

What is the primary purpose of a hashing function?

To map an arbitrary length input to a fixed length output

To encrypt data for secure transmission

To compress data for storage efficiency

To generate random numbers for cryptographic use

What is the role of a digital signature in message security?

To verify the sender's identity and ensure message integrity

To compress the message for faster transmission

To generate a checksum for the message

What is a digital certificate used for?

To verify the trustworthiness of a message sender or website

To encrypt data for secure transmission

To compress files for easier storage

Which infrastructure does a digital certificate allow the holder to use?

Public Key Infrastructure (PKI)

What is the purpose of a digital signature in a digital certificate?

To authenticate the certificate as real

To store the certificate's serial number

What is the difference between lossy and lossless data compression?

Lossy compression reduces file size by removing some data, while lossless compression retains all data

Lossy compression retains all data, while lossless compression removes some data

Both lossy and lossless compression remove data

Both lossy and lossless compression retain all data

What is one disadvantage of lossless compression methods for images?

They do not reduce file size as much as lossy methods

They are more complex to implement

They are not suitable for text files

What is meant by symmetric encryption?

The same key is used for both encryption and decryption

Different keys are used for encryption and decryption

It uses a public key for encryption

It uses a private key for decryption

Why is asymmetric encryption considered more secure than symmetric encryption?

It uses different keys for encryption and decryption

It uses the same key for both encryption and decryption

It requires less computational power

What is an entity in the context of database concepts?

A category of object, person, event, or thing of interest

What is a flat file database?

A database consisting of a single file

A database with multiple tables

A database with complex relationships

What is a secondary key used for in a database?

To maintain an index of primary keys

What is a foreign key in a relational database?

An attribute that creates a join between two tables

A unique identifier for each record in a table

A field that stores large amounts of text

A key that is used to encrypt data

What is a composite primary key?

A key that consists of more than one attribute

A key that consists of a single attribute

A key that is used to encrypt data

A key that is used to link two tables

What is the purpose of drawing an entity relationship diagram in a database system?

To show all the relationships between different entities

To create a visual representation of data flow

To design the user interface of a database

To manage database security settings

In the example of a hospital inpatient system, which entities are involved?

Ward, Nurse, Patient, Consultant

Doctor, Patient, Medicine, Room

Hospital, Staff, Equipment, Visitor

What is referential integrity in a relational database?

Ensuring a component is not deleted if it is used in a product

Creating a backup of the database regularly

Optimizing database queries for speed

H446_4_DB_Compression Quiz

Authored by George Dong

Computers

12th Grade

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the primary purpose of file compression?

To increase the file size

To reduce the storage space of files on disk

To enhance the quality of images

To slow down data transmission

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the difference between lossy and lossless compression?

Lossy compression retains all information, lossless removes unnecessary information

Lossy compression removes non-essential information, lossless retains all information

Both remove all information

Both retain all information

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why is compression important for images on websites?

To make images look more colorful

To enable a web page to load quickly

To increase the file size

To reduce the number of images

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is a consequence of lossy compression on images?

Improved image quality

Increased file size

Displaying untidy and blocky compression artefacts

Slower data transmission

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What type of compression is likely to be used for the following: a website image, a zipped file of long text documents and images, a PDF instruction manual?

Lossy compression

Lossless compression

Run Length Encoding

MP3 compression

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the main advantage of lossless compression?

It reduces file size significantly

It maintains exact accuracy with no data loss

It is faster to process than lossy compression

It is used for audio files

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does Run Length Encoding (RLE) primarily record?

Every pixel in a sequence

The value and number of times a pixel repeats

Only the color of each pixel

The position of each pixel

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H446_4_DB_Compression Quiz

What is the primary purpose of file compression?

What is the difference between lossy and lossless compression?

Why is compression important for images on websites?

What is a consequence of lossy compression on images?

What type of compression is likely to be used for the following: a website image, a zipped file of long text documents and images, a PDF instruction manual?

What is the main advantage of lossless compression?

What does Run Length Encoding (RLE) primarily record?

In the context of the document, what is a common use of MP3 files?

What is the main advantage of dictionary-based compression techniques?

In the context of encryption, what is the term for the original data or message?

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