COS2621 EXAM PACK 2026 - DISTINCTION

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COS2621
EXAM PACK


DISTINCTION QUALITY




UNISA EXAM

,COS2621 EXAM NOTES 2026




Question 1
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

,1.3 Calculate (3A69)16 + (B2E1)16.

(1) (ED4A)16
(2) (AD50)16
(3) (FD5A)16
(4) (FE4A)16
(5) None of the answers given above is correct.

ROUGH WORK

, 1.4 Calculate (74)16 - (3A)16.

(1) 4A16
(2) (10)10
(3) (10)16
(4) (49)16
(5) 3A16

1.5 Which one of the following is a representation of an AND gate?

(1) zy
(2) (x + y)
(3) (xy)
(4) (x + y)
(5) none of the above.


1.6 _________ provide storage internal to the CPU.

(1) Control units
(2) ALUs
(3) Main memory
(4) Registers
(5) 4 and 3

1.7 Give the result of the following binary operation:
A XOR B, where A = 1010 1101 and B = 0011 1001

(1) 1011 1101
(2) 0010 1001
(3) 0000 0000
(4) 0101 0010
(5) None of the above
ROUGH WORK