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Computer Science
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  • Computer Science
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  • Computer Science

1. What is a Natural Number and its Symbol? 2. What is a Real Number and its Symbol? 3. What is an Integer and its Symbol? 4. What is a Rational Number and its Symbol? Positive Integer (N) Any number (R) Any whole number (Z) Can be represented in a Fraction (Q) 5. What is a Ordinal Number? Po...

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  • May 4, 2023
  • 59
  • 2022/2023
  • Exam (elaborations)
  • Questions & answers

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  • 1 what is a natural number and its symbol 2 what is a real number and its symbol 3 what is an integer and its symbol 4 what is a rational number and its symbol positive integer n any numbe

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Computer Science
Study online at
https://quizlet.com/_capwo7
1. What is a Natural Number
Positive Integer
and its Symbol?

2. What is a Real Number and
(N) Any number
its Symbol?

3. What is an Integer and its
Symbol? (R)

4. What is a Rational Number
and its Symbol? Any whole number (Z)


Can be represented in a Fraction (Q)

5. What is a Ordinal Number? Position in a list

6. What is a Cardinal Number? Size of list

7. What is Absolute Error? Difference between actual answer and
esti-
mate

8. What is Relative Error? absolute error/true value

9. How does parity bit Bit (1/0) is added at end of code.
work? (Odd/Even) Even parity - If there is an even
number of 1's, 0 is added
Odd parity - If there is an even number
of 1's, 1 is added

10. What is Majority Voting? 3 bits are sent that are the same as the
origi-
nal bit, the majority amount received
is taken as the original bit. 101 = 1.
Good as corrects errors as well as
spotting them.

11. What is Check digit? All numbers are added up, then the
digits of
1/

, Computer Science
Study online at
https://quizlet.com/_capwo7 the answer are added up, this is
repeated until you are left with 1 digit.
3+4+2+8 = 17
1+7 = 8

12. What is Bit/ Colour depth?




2/

, Computer Science
Study online at
https://quizlet.com/_capwo7
Amount of bits used to represent
all the colours of an image.
17 colours requires 5 bits.

13. What is Metadata? Data about an image/ other data.
-Time, Bit depth, Size

14. What is Analogue data? It is infinite and represented in wave
form

15. What is Digital data? Represented in binary, finite and can be
processed by a computer

16. Why are ADC's used? A computer needs to process analogue
signal
so data needs to be converted from
Analogue to Digital.

17. What is Nyquist's theorem? Sound should be sampled at double the
high-
est frequency.

18. What is Sampling? The process of converting Analogue
signals to Digital.
-Specific readings of amplitude
(Samples) are taken at regular intervals
and converted and stored in binary.

19. What happens when - Increase in file size
sample rate increases? - Increase in quality

20. What is Encryption? Converting Plaintext to Ciphertext to
make it
useless for anyone who intercepts it.

21. What is a Caeser Cipher? Moving the alphabet up and down or
replacing
letters with other letters.

22. What is a Vernam Cipher? Using a randomly generated key for
3/

, Computer Science
Study online at
https://quizlet.com/_capwo7
both en-
cryption and decryption. XOR gate is
used.

23. What does a Vernam key - Randomly generated
have to be? - Same length as plaintext




4/

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