COS2621 EXAM PACK
2024
QUESTIONS AND
ANSWERS
FOR ASSISTANCE CONTACT
EMAIL:
, lOMoARcPSD|46589353
FINAL
%
COS2621
MAY/JUNE 2020
Computer Organisation
STUDENT NUMBER
IDENTITY NUMBER
Marks
FOR USE BY EXAMINATION INVIGILATOR Question No
Examiners
1 2
Q1
Q2
……………………………………………………….
Q3
Subject
……………………………………………………….
Number of paper
……………………………………………………….
Date of examination
……………………………………………………….
Examination centre
Total / Totaal
WARNING
1. A candidate who without authorisation takes into the examination venue any book, document or object which could assist him/her in
the examination, and does not hand over such material to the invigilator before the official commencement of the examination, will be
guilty of infringing the University’s examination regulations and will be liable to punishment as determined by Council.
2. Rough work may be done only on the examination question paper and must be labelled as such.
3. No notes may be made on any part of the body, such as the hands, or on any garment.
4. This page/paper is the property of the University and under no circumstances may the candidate retain it or take it out of the
examination venue.
NB: PLEASE COMPLETE THE ATTENDANCE REGISTER ON THE BACK PAGE, TEAR OFF AND HAND TO THE INVIGILATOR
Open Rubric
Downloaded by Gabriel Musyoka ()
, lOMoARcPSD|46589353
Mr K Phorah
This paper consists of 12 pages plus an appendix.
INSTRUCTIONS
1. Answer question 1 on the answer sheet provided on p. 2 of the examination paper and questions
2, and 3 in the space provided below the question. Please do not detach any sheets from the
question and answer book.
2. All rough work must be done in this question and answer book.
3. The mark for each question is given in brackets next to the question.
4. The appendix contains a list of x86 Assembly Language instructions.
ALL THE BEST!
Downloaded by Gabriel Musyoka ()
, lOMoARcPSD|46589353
2 COS2621
May/June 2020
Question 1 [30]
Question 1 [30]
Indicate which one of alternatives (1) to (5) you consider to be the correct one by highlighting the correct
answer. Each question counts 2 marks.
1.1 Which one of the following statements is false when we are talking about ASCII encodings?
(1) ASCII is a fixed length code.
(2) The last 4 bits for each digit (0-9) are identical to the binary representation of the digit.
(3) When using 8 bits to store characters, the rightmost bit is always set to zero.
(4) The ASCII representation of a space is 20h.
(5) When one wants to convert an ASCII character (‘0’ to ‘9’) to its numerical value, we can simply subtract
30h from the ASCII encoding.
1.2 Which one of the following binary codes have even parity (assume that the left-most bit is the parity bit)?
(1) 10101110
(2) 10101010
(3) 10100111
(4) 11110001
(5) 00000001
Downloaded by Gabriel Musyoka ()
2024
QUESTIONS AND
ANSWERS
FOR ASSISTANCE CONTACT
EMAIL:
, lOMoARcPSD|46589353
FINAL
%
COS2621
MAY/JUNE 2020
Computer Organisation
STUDENT NUMBER
IDENTITY NUMBER
Marks
FOR USE BY EXAMINATION INVIGILATOR Question No
Examiners
1 2
Q1
Q2
……………………………………………………….
Q3
Subject
……………………………………………………….
Number of paper
……………………………………………………….
Date of examination
……………………………………………………….
Examination centre
Total / Totaal
WARNING
1. A candidate who without authorisation takes into the examination venue any book, document or object which could assist him/her in
the examination, and does not hand over such material to the invigilator before the official commencement of the examination, will be
guilty of infringing the University’s examination regulations and will be liable to punishment as determined by Council.
2. Rough work may be done only on the examination question paper and must be labelled as such.
3. No notes may be made on any part of the body, such as the hands, or on any garment.
4. This page/paper is the property of the University and under no circumstances may the candidate retain it or take it out of the
examination venue.
NB: PLEASE COMPLETE THE ATTENDANCE REGISTER ON THE BACK PAGE, TEAR OFF AND HAND TO THE INVIGILATOR
Open Rubric
Downloaded by Gabriel Musyoka ()
, lOMoARcPSD|46589353
Mr K Phorah
This paper consists of 12 pages plus an appendix.
INSTRUCTIONS
1. Answer question 1 on the answer sheet provided on p. 2 of the examination paper and questions
2, and 3 in the space provided below the question. Please do not detach any sheets from the
question and answer book.
2. All rough work must be done in this question and answer book.
3. The mark for each question is given in brackets next to the question.
4. The appendix contains a list of x86 Assembly Language instructions.
ALL THE BEST!
Downloaded by Gabriel Musyoka ()
, lOMoARcPSD|46589353
2 COS2621
May/June 2020
Question 1 [30]
Question 1 [30]
Indicate which one of alternatives (1) to (5) you consider to be the correct one by highlighting the correct
answer. Each question counts 2 marks.
1.1 Which one of the following statements is false when we are talking about ASCII encodings?
(1) ASCII is a fixed length code.
(2) The last 4 bits for each digit (0-9) are identical to the binary representation of the digit.
(3) When using 8 bits to store characters, the rightmost bit is always set to zero.
(4) The ASCII representation of a space is 20h.
(5) When one wants to convert an ASCII character (‘0’ to ‘9’) to its numerical value, we can simply subtract
30h from the ASCII encoding.
1.2 Which one of the following binary codes have even parity (assume that the left-most bit is the parity bit)?
(1) 10101110
(2) 10101010
(3) 10100111
(4) 11110001
(5) 00000001
Downloaded by Gabriel Musyoka ()
