Ordinary level 2026 littoral regional mock computer science guide
Ordinary level 2026 littoral regional mock computer science guide
PAPER 2
0595 COMPUTER SCIENCE PAPER 2 (MARCH 2026) MARKING GUIDE
GENERAL INSTRUCTIONS FOR THE TEACHER:
This paper consists of seven questions. Candidates must answer any FIVE.
Each question is graded out of 20 marks.
Award marks for correct steps in calculations, even if the final answer is wrong.
QUESTION 1: HARDWARE & LOGIC CIRCUITS (20 Marks)
1(a)(i) Selection and Justification (3 marks):
Selection: Non-impact printer.
Justification: Based on the text, the principal was advised that print quality and ink consumption are more
important than initial cost. Non-impact printers (like Laser or Inkjet) offer superior print quality and better
ink/toner efficiency for report cards.
1(a)(ii) Definitions (8 marks):
Hardcopy: A physical, permanent version of a document usually printed on paper.
Impact printer: A printer that creates images by striking an inked ribbon against the paper (e.g., Dot Matrix).
Non-Impact printer: A printer that creates images without physical contact between the print head and the
paper (e.g., Laser or Inkjet).
Print quality: The clarity, resolution, and sharpness of the output produced by a printer.
1(b)(i) Logic Expressions (3 marks):
P = X OR Y (or X + Y).
B = X AND Y (or X.Y).
R = NOT (P AND B) (or NAND gate output).
1(b)(ii) Truth Table Completion (3 marks): (Note: Based on Fig 1, R is a NAND gate combining P and B)
Row 1 (X=0, Y=0): P=0, B=0, R=1
Row 2 (X=0, Y=1): P=1, B=0, R=1
Row 3 (X=1, Y=0): P=1, B=0, R=1
Row 4 (X=1, Y=1): P=1, B=1, R=0
1(c) Storage Calculation (3 marks):
DVD Capacity = 10.0 GB = 10,000 MB (Approximating 1GB = 1000MB for O-Level).
