Computer Science (13.10.22)

Question 1

What are Binary Systems?

Answer 1

-Everything that a computer needs to process must be converted into a binary format
-This format is used for storing numbers, text, images, sound and program instructions

Question 2

What is a bit?

Answer 2

a single 0 or 1

Question 3

How many bits in1 byte?

Answer 3

8 bits = 1 character of text

Question 4

How many bits in 1 nibble?

Answer 4

4 bits or half a byte

Question 5

How many bytes in 1 KiB (kibibyte)?

Answer 5

1024 bytes

Question 6

How many KiB in a 1 MiB (mebibyte)?

Answer 6

1024 KiB

Question 7

How many MiB in 1 GiB (gibibyte)?

Answer 7

1024 MiB

Question 8

How many GiB in 1 TiB (tebibyte)?

Answer 8

1024 GiB

Question 9

How many TiB in 1 PiB (pebibyte)?

Answer 9

1023 TiB

Question 10

How many PiB in 1 EiB (exbibyte)?

Answer 10

1024 PiB

Question 11

What does MAC stand for?

Answer 11

media access controller

Question 12

What are the rules for Binary to Denary conversions?

Answer 12

-Even binary numbers will have a 0 at the end
-Odd binary numbers will have a 1 at the end

Question 13

What does MSB stand for?

Answer 13

most significant bit

Question 14

What does LSB stand for?

Answer 14

least significant bit

Question 15

What is 0?

Answer 15

positive

Question 16

What is 1?

Answer 16

negative

Question 17

How much is 1 Kilobyte?

Answer 17

1000 bytes

Question 18

Why is data represented in binary in a computer?

Answer 18

It makes it easier to present information

Question 19

What does ASCII stand for?

Answer 19

American Standard Code for Information Interchange

Question 20

What is maximum number of characters in a keyboard?

Answer 20

255

Question 21

How is the Representing of Text Characters in a computer?

Answer 21

-Every character on the keyboard is represented in a binary value
-Upper case ltters have different values from lowercase characters
-Punctuation symbols have their own character code

Question 22

What does a keyboard contain?

Answer 22

-26 lowercase letters
-26 uppercase letters
-10 numbers
-(around) 36 other characters

Question 23

What are Character Sets?

Answer 23

A character set is a set of letters, symbols and digits that can be represented by a computer
-There are two major character sets used today: ASCII and UNICODE

Question 24

What is ASCII?

Answer 24

-It has become the standard code, used worldwide
-It was originally developed in the 1960s for representing the English alphabet
-It encode 128 characters into 7-bit binary codes
-Characters include numbers 0 to 9, uppercase and lowercase letters A-Z, a-z, punctuation symbols and the space symbols

Question 25

What are Groups and Sequences?

Answer 25

-Numeric characters 0 to 9 run consecutively from 48 to 57 on the ASCII table
-A-Z characters are from 65-90

Question 26

What are 7 and 8-bit in ASCII?

Answer 26

-Numerous different codes for representing characters have been created, but ASCII is commonly used on PCs
-Originally only 7 bits were used, but now and 8th bit is used allowing many far more characters

Question 27

What does Concatuation do?

Answer 27

joins information together (eg: 7+5=75) + counting totally
-for-> counter loop (counter controls how many times it happens)
-repeat loop-> (not python, yes pseudecode, basic…)

Question 28

What is Pre-Condition? (programing)

Answer 28

while

Question 29

What is Post-Condition? (programing)

Answer 29

endwhile

Question 30

What are the 3 types of variable in the Counter Controlled Loop?

Answer 30

-int(eger)
-float(ing point)
-str(ing)

Question 31

What are the 3 types of statements in the Counter Controlled Loop?

Answer 31

-Sequence
-Selection (if… elif,… else)
-Iteration (while,for)