Computer Science 9618/11 — October/November 2022

Cambridge AS Level · Theory Fundamentals · worked solutions for every part, with the mark scheme

questions

marks

minutes

Topics Processor Fundamentals · Information Representation · Hardware · Security, Privacy and Data Integrity · Databases · System Software · +1 more

Q1Information RepresentationFree sample

(a)

(i)

Convert the unsigned binary integer into denary.

00100111

Answer ........................................................................................................................

(ii)

Convert the Binary Coded Decimal (BCD) into denary.

00100111

Answer ........................................................................................................................

(iii)

Convert the 8-bit two’s complement binary integer into denary.

11100111

Answer ........................................................................................................................

(b)

Perform the following binary subtraction. Show your working.

  1 0 1 1 0 0 1 1
- 0 1 1 1 0 1 0 1
-----------------

(c)

Give one similarity and two differences between the ASCII and Unicode character sets.

Similarity ...................................................................................................................................

...................................................................................................................................................

Difference 1 ..............................................................................................................................

...................................................................................................................................................

Difference 2 ..............................................................................................................................

...................................................................................................................................................

(d)

Sound samples are recorded and saved in a file.

(i)

State what is meant by sampling rate.

...........................................................................................................................................

.....................................................................................................................................

(ii)

Explain the effect of increasing the sampling resolution on the sound file.

...........................................................................................................................................

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