IBO Level 3 Certificate in SL Computer Science Practice
Exam
**Question 1.** Which stage of the Systems Development Life Cycle (SDLC)
primarily involves gathering user requirements and defining system specifications?
A) Planning
B) Analysis
C) Design
D) Implementation
**Answer:** B
**Explanation:** The analysis stage focuses on understanding user needs and
documenting system requirements, forming the basis for subsequent design work.
**Question 2.** In a waterfall methodology, which activity directly follows the
design phase?
A) Testing
B) Implementation
C) Maintenance
D) Planning
**Answer:** B
**Explanation:** Waterfall proceeds sequentially; after design the system is built
(implementation) before testing.
**Question 3.** Which deployment method introduces a new system alongside
the old one, allowing both to run simultaneously for a period?
, IBO Level 3 Certificate in SL Computer Science Practice
Exam
A) Direct cut‑over
B) Phased rollout
C) Parallel deployment
D) Pilot deployment
**Answer:** C
**Explanation:** Parallel deployment runs the new and existing systems together,
enabling comparison and risk reduction.
**Question 4.** The principle of “digital citizenship” most directly addresses
which of the following?
A) Hardware maintenance
B) Ethical use of information technology
C) Network routing protocols
D) Data compression techniques
**Answer:** B
**Explanation:** Digital citizenship concerns responsible, ethical, and legal
behavior online.
**Question 5.** Which component of a computer is responsible for executing
program instructions?
A) Primary memory
B) Central Processing Unit (CPU)
, IBO Level 3 Certificate in SL Computer Science Practice
Exam
C) Secondary storage
D) Input device
**Answer:** B
**Explanation:** The CPU fetches, decodes, and executes instructions, acting as
the computer’s brain.
**Question 6.** In the context of operating systems, what does “process
management” involve?
A) Storing files permanently
B) Allocating CPU time to running programs
C) Translating high‑level code to machine code
D) Managing peripheral device drivers
**Answer:** B
**Explanation:** Process management schedules and controls the execution of
processes, allocating CPU resources.
**Question 7.** Convert the binary number 101101₂ to its decimal equivalent.
A) 45
B) 53
C) 57
D) 61
, IBO Level 3 Certificate in SL Computer Science Practice
Exam
**Answer:** B
**Explanation:** 1×2⁵ + 0×2⁴ + 1×2³ + 1×2² + 0×2¹ + 1×2⁰ = 32 + 0 + 8 + 4 + 0 + 1 =
45 (Oops). Actually calculation: 1*32 +0*16+1*8+1*4+0*2+1*1 = 32+0+8+4+0+1 =
45 → **Answer A**.
**Correct Answer:** A
**Explanation:** The binary 101101 equals 45 in decimal as shown.
**Question 8.** Which hexadecimal value corresponds to the binary sequence
1100 1111?
A) CF
B) 3F
C) C7
D) F3
**Answer:** A
**Explanation:** Grouping into fours: 1100 = C, 1111 = F, giving CF.
**Question 9.** In ASCII, the character ‘A’ is represented by which decimal value?
A) 65
B) 97
C) 48
D) 90
Exam
**Question 1.** Which stage of the Systems Development Life Cycle (SDLC)
primarily involves gathering user requirements and defining system specifications?
A) Planning
B) Analysis
C) Design
D) Implementation
**Answer:** B
**Explanation:** The analysis stage focuses on understanding user needs and
documenting system requirements, forming the basis for subsequent design work.
**Question 2.** In a waterfall methodology, which activity directly follows the
design phase?
A) Testing
B) Implementation
C) Maintenance
D) Planning
**Answer:** B
**Explanation:** Waterfall proceeds sequentially; after design the system is built
(implementation) before testing.
**Question 3.** Which deployment method introduces a new system alongside
the old one, allowing both to run simultaneously for a period?
, IBO Level 3 Certificate in SL Computer Science Practice
Exam
A) Direct cut‑over
B) Phased rollout
C) Parallel deployment
D) Pilot deployment
**Answer:** C
**Explanation:** Parallel deployment runs the new and existing systems together,
enabling comparison and risk reduction.
**Question 4.** The principle of “digital citizenship” most directly addresses
which of the following?
A) Hardware maintenance
B) Ethical use of information technology
C) Network routing protocols
D) Data compression techniques
**Answer:** B
**Explanation:** Digital citizenship concerns responsible, ethical, and legal
behavior online.
**Question 5.** Which component of a computer is responsible for executing
program instructions?
A) Primary memory
B) Central Processing Unit (CPU)
, IBO Level 3 Certificate in SL Computer Science Practice
Exam
C) Secondary storage
D) Input device
**Answer:** B
**Explanation:** The CPU fetches, decodes, and executes instructions, acting as
the computer’s brain.
**Question 6.** In the context of operating systems, what does “process
management” involve?
A) Storing files permanently
B) Allocating CPU time to running programs
C) Translating high‑level code to machine code
D) Managing peripheral device drivers
**Answer:** B
**Explanation:** Process management schedules and controls the execution of
processes, allocating CPU resources.
**Question 7.** Convert the binary number 101101₂ to its decimal equivalent.
A) 45
B) 53
C) 57
D) 61
, IBO Level 3 Certificate in SL Computer Science Practice
Exam
**Answer:** B
**Explanation:** 1×2⁵ + 0×2⁴ + 1×2³ + 1×2² + 0×2¹ + 1×2⁰ = 32 + 0 + 8 + 4 + 0 + 1 =
45 (Oops). Actually calculation: 1*32 +0*16+1*8+1*4+0*2+1*1 = 32+0+8+4+0+1 =
45 → **Answer A**.
**Correct Answer:** A
**Explanation:** The binary 101101 equals 45 in decimal as shown.
**Question 8.** Which hexadecimal value corresponds to the binary sequence
1100 1111?
A) CF
B) 3F
C) C7
D) F3
**Answer:** A
**Explanation:** Grouping into fours: 1100 = C, 1111 = F, giving CF.
**Question 9.** In ASCII, the character ‘A’ is represented by which decimal value?
A) 65
B) 97
C) 48
D) 90
