Computer Science for IGCSE & O level - Data Representation (Section 18)

• 1

  What is the meaning of the term 'sampling rate' in sound recording?

  回答

  (A)

  The number of times the sound is measured per second.
• 2

  If a binary number is shifted three places to the left, what is the equivalent arithmetic operation performed?

  回答

  (B)

  Multiplying by 8
• 3

  What is the relationship between the sampling rate and the size of a digital audio file?

  回答

  (C)

  A higher sampling rate generally results in a larger file size.
• 4

  Which of the following are advantages of file compression?

  回答

  A

  B
• 5

  What is the equivalent decimal value of the hexadecimal number '1A'?

  回答

  (C)

  32
• 6

  Which of these is a key characteristic of the hexadecimal number system?

  回答

  (C)

  Uses sixteen symbols.
• 7

  Which options accurately describe the characteristics of lossless compression?

  回答

  A

  B

  D
• 8

  If the bit depth of an image is increased from 8 bits to 16 bits, what is the effect on the file size?

  回答

  (B)

  The file size is doubled.
• 9

  Which color does the HTML code #008000 represent?

  回答

  (B)

  Green
• 10

  What is the maximum value represented by a single hexadecimal digit?

  回答

  (C)

  15
• 11

  In HTML, what is the purpose of the hexadecimal color code?

  回答

  (D)

  To represent different colors used in the web page.
• 12

  The image of a black and white image consists of 64 squares. If each square requires 1 byte of storage, and RLE is applied. What would be the storage requirement for a full black image?

  回答

  (B)

  2 bytes
• 13

  Which of the following are advantages of data compression?

  回答

  A

  B

  C
• 14

  What does the term 'unsigned integer' mean in computer science?

  回答

  (B)

  An integer that can only represent positive numbers.
• 15

  A bit is the basic unit of all computing memory storage terms and is either 1 or 0. The word comes from binary digit. The byte is the smallest unit of memory in a computer. 1 byte is 8 bits. A bit is sometimes called a nibble - half a byte. What is the relationship between byte and bit?

  回答

  (C)

  1 byte = 8 bits
• 16

  What does the term 'bit' refer to?

  回答

  (B)

  A binary digit
• 17

  If a bitmap image has a color depth of 8 bits, how many different colors can each pixel represent?

  回答

  (D)

  256
• 18

  What does a higher sampling rate result in for digital audio?

  回答

  (B)

  Higher sound quality and a larger file size.
• 19

  In run-length encoding (RLE), what is the purpose of representing consecutive identical data values?

  回答

  (C)

  To reduce the file size.
• 20

  What are the 2 ways in the image that allow to find a negative binary representation?

  回答

  C

  D
• 21

  What is the main function of the ASCII control characters?

  回答

  (B)

  Manage text formatting and communication
• 22

  What is the purpose of using compression algorithms like JPEG for images?

  回答

  (B)

  To decrease the file size while maintaining a reasonable image quality.
• 23

  What will happen if the binary number 1111 is shifted one place to the left?

  回答

  (A)

  Multiplied by 2
• 24

  What are the key principles of run-length encoding (RLE)?

  回答

  A

  D