What is meant by bit depth?

The number of bits used to store each sound sample

The number of samples taken per second

The number of bits used per second of audio

Which of the following is true if you decrease the bit rate?

Number of sound samples take per second increases

The purpose of a Digital to Analogue converter is to...

convert binary data into analogue form so we can hear it via a speaker

convert sound waves into binary so it can be understood by a computer

The amplitude of a sound wave is...

How high the wave is from crest to trough

The frequency at which it is sampled

The speed at which it travels through the air

The following is true about metadata:

It significantly increases file sizes.

Metadata doesn't contain the following:

Camera settings for when the picture was taken.

What information is stored as metadata?

width, height, colour depth, colour index

height, colour depth, colour index, bit ratios

hex to binary lookup, width, colour table, bit management

pixel count, colour depth, colour index, bit ratios

What is meant by the term 'colour depth'?

Number of bits used to encode each pixel.

What formula is used to calculate the file size of an image without knowing the DPI?

Width of pixels x Height of pixels x colour depth.

Width of pixels x Height of pixels x 8

How does clock speed affect computer performance?

The higher the clock speed the better the performance.

The higher the clock speed the slower the computer will run.

It improves the amount you can store on the computer.

It will make loading program slower

How can a bigger cache improve CPU performance?

By being able to store more recently used instruction inside the CPU for quicker access times

By being able to carry out more calculations

Number of instructions a computer can handle per second

Number of times the computer is used

What happens if you increase the number of cores

CPU can process more instructions at the same time

CPU can process instructions quicker

CPU processes too fast for the cache to handle

Barry has a 1GHZ dual core CPU. He improves it to a 4GHZ quad core CPU. What is the effect on the performance of his computer?

The number of instructions executed per second improves by 8 times

The number of instructions executed per second doubles

The number of instructions executed per second triples

The number of instructions executed per second quadruples

Faster than main memory and more expensive

Faster than main memory but less expensive

Slower than main memory and less expensive

Slower than main memory but more expensive

Which transfer is faster

data between the cache and the CPU

data between the hard drive and CPU

Computer Science Theory

Quiz

•

Computers

•

9th Grade

•

Practice Problem

•

Medium

•

CCSS

RI.8.7, RI.9-10.7, RL.7.7

+2

Standards-aligned

Used 22+ times

FREE Resource

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172 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

The purpose of data compression is to decrease file sizes .

True

False

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A jpeg is a compressed image file.

True

False

3.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

What type of compression would you use to compress a video?

Lossy

Lossless

4.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

What is Lossless Compression?

No information is lost but file size is increased

There is no loss of information at all after compression

Files which have the exact same data after compression

Compression involves an algorithm

5.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

What does Lossy Compression do to files?

Increases the file size and keeps the same quality

Eliminates no information at all

Decreases the file size and keeps the same quality

Eliminates unnecessary information in a file to reduce file size

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

When Lossy compression is used data is lost?

True

False

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The audio file format MP3 is:

Lossy

Lossless

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Computer Science Theory

172 questions

The purpose of data compression is to decrease file sizes .

A jpeg is a compressed image file.

What type of compression would you use to compress a video?

What is Lossless Compression?

What does Lossy Compression do to files?

When Lossy compression is used data is lost?

The audio file format MP3 is:

The video file format MP4 is:

Makes the file smaller by deleting parts of the file permanently (forever)

Has this been compressed using Lossy or Lossless?

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