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“200”, Aptitude Test
Questions and Answers for ICT Officer II (Programmer) – NBS.
ABSTRACT
This book contains 200 multiple-choice
questions and answers designed to help candidates prepare for the ICT Officer
II (Programmer) aptitude test for the National Bureau of Statistics (NBS)
conducted through the Public Service Recruitment Secretariat (PSRS) of
Tanzania. The questions are designed to reflect the analytical,
competency-based, and scenario-oriented nature of public service aptitude tests
by assessing candidates’ understanding, logical reasoning, and ability to apply
ICT knowledge in practical situations rather than relying on memorization. The
content covers systems analysis and design, software development life cycle,
programming concepts, object-oriented programming, software engineering
principles, databases and SQL, software testing, system documentation,
information security, algorithms, data structures, APIs, version control,
software architecture, ICT maintenance, and professional ethics relevant to the
duties of an ICT Officer II (Programmer). Each question is accompanied by the
correct answer and a detailed rationale to strengthen conceptual understanding,
reinforce learning, and improve candidates' confidence and readiness for the
recruitment examination.
Prepared by: ICT Officer II (Programmer) –
NBS.
Compiled by ICT Officer II (Programmer) – NBS.
Professionals stationed in Dar-es-salaam.
0628729934.
Date: July 19, 2026
Dear applicants,
This collection of questions and answers
has been prepared to help all of you to understand the key areas tested during
the interview. The goal is to provide a useful, and practical study guide so
you can all perform confidently and fairly in the selection process. I wish you
the best of luck, and may this resource support you in achieving success!
Warm regards,
Johnson Yesaya Mgelwa
For Personal Use by Applicants Preparing
for ICT Officer II (Programmer) – National Bureau of Standards (NBS).
ALL QUESTIONS TOGETHER.
Question 1
An ICT Officer II (Programmer) at
NBS is assigned to develop a new data collection system. Before writing any
code, the officer meets users from several departments to determine exactly
what the system should accomplish. What is the PRIMARY purpose of this
activity?
A. To estimate the project budget
only. B. To identify user requirements before system development. C. To prepare
maintenance procedures after deployment. D. To verify network performance
before implementation.
Answer: B. To identify user
requirements before system development.
Rationale: Systems development begins with
understanding what users actually need. Requirement gathering ensures the final
system solves the intended business problem and reduces costly changes later.
Budget estimation, maintenance planning, and network verification are important
activities, but they occur at different stages of the project and cannot
replace comprehensive requirements analysis.
Question 2
A programmer modifies a module
without updating the corresponding system documentation. Several months later,
another developer cannot understand the new logic and introduces errors while
making further changes. Which software engineering principle was MOST directly
violated?
A. Performance optimization. B.
User authentication. C. Documentation consistency. D. Database normalization.
Answer: C. Documentation
consistency.
Rationale: System documentation must always reflect
the current implementation. When documentation is outdated, maintenance becomes
difficult, increases the likelihood of introducing defects, and slows future
development. Performance optimization, authentication, and normalization are
unrelated to maintaining accurate technical documentation.
Question 3
During system analysis, users
repeatedly request additional features after requirements have already been
approved. If these requests continue without proper control, what project risk
is MOST likely?
A. Scope creep. B. Data
redundancy. C. Deadlock condition. D. Memory fragmentation.
Answer: A. Scope creep.
Rationale: Scope creep occurs when project
requirements continue expanding without formal evaluation or approval. It often
results in delays, increased costs, and missed deadlines. The remaining options
describe unrelated technical issues affecting databases, operating systems, or
concurrent computing rather than project management.
Question 4
A programmer is preparing a
system flowchart. Which symbol should represent a decision where processing
follows different paths depending on whether a condition is true or false?
A. Rectangle. B. Oval. C.
Parallelogram. D. Diamond.
Answer: D. Diamond.
Rationale: The diamond symbol universally represents
a decision point in system flowcharts. It allows the process to branch based on
conditions such as Yes/No or True/False. Rectangles indicate processes, ovals
represent start or end points, and parallelograms are used for input and output
operations.
Question 5
An application successfully
passes all individual module tests. The next step is to verify whether the
modules interact correctly when combined. Which testing level should be
performed?
A. Acceptance testing. B.
Integration testing. C. Regression testing. D. Usability testing.
Answer: B. Integration
testing.
Rationale: Integration testing focuses on verifying
communication and interaction among individual software modules after unit
testing has been completed. Acceptance testing determines whether the system
satisfies users, regression testing checks for unintended effects after
changes, and usability testing evaluates user experience rather than module
interaction.
Question 6
A programmer discovers that
different parts of an application perform exactly the same calculation using
copied code. Which programming practice would BEST improve long-term
maintainability?
A. Increase variable names. B.
Replace comments with diagrams. C. Encapsulate the logic into a reusable
function. D. Execute the calculation inside every module.
Answer: C. Encapsulate the
logic into a reusable function.
Rationale: Reusable functions eliminate duplicated
code, simplify maintenance, reduce inconsistencies, and improve software
quality. If the calculation changes, only one function requires modification.
Repeating the same logic throughout the application increases maintenance
effort and the likelihood of inconsistent updates.
Question 7
A database table stores employee
records using EmployeeID as a unique identifier. Why is EmployeeID preferred
over employee names when establishing relationships with other tables?
A. Employee names require less
storage. B. EmployeeID uniquely identifies each record. C. Employee names
improve query speed automatically. D. EmployeeID prevents all database
failures.
Answer: B. EmployeeID uniquely
identifies each record.
Rationale: Primary keys uniquely identify each
record and remain stable even when names change or duplicates exist. Names may
not be unique and can change over time, making them unsuitable as relationship
keys. Although indexing can improve performance, uniqueness—not storage or
failure prevention—is the principal reason for using identifiers.
Question 8
A programmer notices that
confidential statistical records are accessible to staff members who have no
official responsibility for them. Which information security principle has MOST
likely been violated?
A. Least privilege. B. High
availability. C. Fault tolerance. D. Resource virtualization.
Answer: A. Least privilege.
Rationale: The principle of least privilege requires
users to receive only the minimum permissions necessary to perform their
duties. Granting unnecessary access increases the risk of unauthorized
disclosure or misuse of sensitive information. Availability, fault tolerance,
and virtualization address different aspects of system design.
Question 9
A software development team
decides that every source code modification must be reviewed by another
programmer before being merged into the main project. What is the PRIMARY
objective of this practice?
A. Reduce electricity
consumption. B. Increase processor utilization. C. Improve code quality and
detect defects early. D. Eliminate the need for software testing.
Answer: C. Improve code
quality and detect defects early.
Rationale: Peer code reviews identify logical
errors, improve coding standards, encourage knowledge sharing, and detect
defects before testing begins. Reviews complement rather than replace software
testing. Their purpose is software quality improvement, not hardware
performance or energy efficiency.
Question 10
During system analysis, an ICT
Officer discovers that two departments use different definitions for the term "Active
Household." If this inconsistency is not resolved before development
begins, what is the MOST likely consequence?
A. Faster system implementation. B.
Improved database performance. C. Different users may interpret reports
differently. D. Automatic normalization of data.
Answer: C. Different users may
interpret reports differently.
Rationale: Shared business terminology must be
clearly defined during requirements analysis. Different interpretations of key
terms can produce inconsistent reports, incorrect business decisions, and
software that fails to satisfy stakeholder expectations. Establishing a common
business vocabulary is therefore an essential part of systems analysis.
Question 11
A programmer changes one module
to correct a reported defect. Before releasing the updated application, which
testing activity is MOST important to ensure that existing functions still
operate correctly?
A. Smoke testing only. B. Load
testing only. C. Regression testing. D. Installation testing.
Answer: C. Regression testing.
Rationale: Regression testing verifies that recent
changes have not unintentionally affected previously working functionality.
Correcting one defect can introduce others, making regression testing an
essential quality assurance practice. Smoke, load, and installation testing
evaluate different aspects of software quality.
Question 12
During requirements analysis, two
departments request conflicting system behaviors. What should the systems
analyst do FIRST?
A. Implement both immediately. B.
Ignore one department. C. Escalate directly for procurement. D. Clarify
requirements with stakeholders.
Answer: D. Clarify
requirements with stakeholders.
Rationale: Conflicting requirements should be
resolved through consultation with stakeholders before development begins.
Clarification ensures the system reflects agreed business needs and avoids
expensive redesign later. Ignoring conflicts or implementing assumptions often
leads to project failure.
Question 13
A programmer stores database
connection details directly inside multiple source code files. Which software
engineering concern is MOST likely to arise?
A. Difficult maintenance when
configurations change. B. Improved modularity across the application. C.
Reduced dependency between software modules. D. Automatic encryption of
sensitive information.
Answer: A. Difficult
maintenance when configurations change.
Rationale: Hardcoding configuration values creates
maintenance problems because every occurrence must be updated whenever the
configuration changes. External configuration files or environment variables
improve flexibility and reduce maintenance effort. Hardcoding does not improve
modularity or provide encryption.
Question 14
Which database operation
retrieves records that satisfy specified conditions without modifying the
stored data?
A. INSERT. B. UPDATE. C. SELECT. D.
DELETE.
Answer: C. SELECT.
Rationale: The SQL SELECT statement retrieves
information while leaving stored data unchanged. INSERT adds records, UPDATE
modifies existing data, and DELETE removes records. Reading information without
alteration is one of the most common database operations.
Question 15
A programmer receives reports
that an application becomes slower as the database grows, although the program
logic remains unchanged. Which action should be investigated FIRST?
A. Review database indexing
strategy. B. Replace all variable names. C. Increase monitor brightness. D.
Rewrite the operating system.
Answer: A. Review database
indexing strategy.
Rationale: Poor indexing is a common cause of
declining database performance as data volume increases. Appropriate indexes
significantly reduce search time without changing application logic. The other
options have little or no relationship to database query performance.
Question 16
A newly developed application is
delivered to users, who evaluate whether it satisfies operational requirements
before official deployment. Which testing stage is being performed?
A. Unit testing. B. Integration
testing. C. Acceptance testing. D. Static analysis.
Answer: C. Acceptance testing.
Rationale: Acceptance testing determines whether the
completed system meets user expectations and business requirements before
implementation. Unit testing evaluates individual components, integration
testing examines module interaction, and static analysis reviews code without
execution.
Question 17
A programmer wants to reduce the
possibility of invalid information being stored in the database. Which measure
should be implemented closest to the point where data enters the system?
A. Memory defragmentation. B. Screen resolution adjustment. C. Processor
overclocking. D. Input validation.
Answer: D. Input validation.
Rationale: Input validation checks data before
processing or storage, ensuring accuracy, consistency, and compliance with
business rules. Preventing invalid data at the point of entry is more effective
than correcting it later. The remaining options relate to hardware rather than
data quality.
Question 18
Which software development
practice MOST directly supports tracking every modification made to program
source code over time?
A. Version control system. B.
Operating system scheduler. C. Network firewall. D. Disk partition manager.
Answer: A. Version control
system.
Rationale: Version control systems maintain complete
histories of source code changes, support collaboration, facilitate rollback,
and help resolve conflicts between developers. Operating systems, firewalls,
and partition managers perform entirely different functions.
Question 19
An ICT Officer performs routine
cleaning and inspection of computer hardware to reduce the likelihood of
unexpected equipment failure. This activity is BEST classified as:
A. Corrective maintenance. B.
Preventive maintenance. C. Adaptive maintenance. D. Perfective maintenance.
Answer: B. Preventive
maintenance.
Rationale: Preventive maintenance involves scheduled
actions intended to reduce the probability of equipment failure before problems
occur. Corrective maintenance repairs existing faults, adaptive maintenance
accommodates environmental changes, and perfective maintenance improves
existing functionality.
Question 20
A programmer discovers that two
different users can accidentally overwrite each other's changes when editing
the same record simultaneously. Which database concept is intended to prevent
such inconsistencies?
A. Disk mirroring. B. Data compression. C. Concurrency control. D.
File archiving.
Answer: C. Concurrency
control.
Rationale: Concurrency control ensures multiple
users can access shared data without causing conflicts or compromising database
consistency. Locking and transaction management are common mechanisms.
Compression, mirroring, and archiving address storage and backup rather than
simultaneous access.
Question 21
A supervisor instructs an ICT
Officer to bypass established Standard Operating Procedures (SOPs) simply to
complete a task more quickly. What should the officer do?
A. Ignore documentation
completely. B. Follow informal procedures permanently. C. Adhere to approved
SOPs unless formally authorized otherwise. D. Modify the procedures
independently.
Answer: C. Adhere to approved
SOPs unless formally authorized otherwise.
Rationale: Public institutions rely on approved
Standard Operating Procedures to ensure consistency, accountability,
compliance, and quality. Deviating from them without proper authorization may
compromise security, audit requirements, and operational integrity.
Question 22
A programmer notices that one
software module performs several unrelated tasks, making it difficult to
understand and maintain. Which software design principle is MOST relevant?
A. Single Responsibility
Principle. B. First Come First Served. C. Round Robin Scheduling. D. Divide and
Conquer Sorting.
Answer: A. Single
Responsibility Principle.
Rationale: The Single Responsibility Principle
states that each module should have one well-defined responsibility. This
improves readability, testing, maintenance, and future modifications. The other
options relate to scheduling or algorithms rather than software design
principles.
Question 23
Before programmers begin
implementing a new module, management requires a document describing how the
software will be structured, including major components, interfaces, and data
flow. Which document BEST satisfies this purpose?
A. User Manual. B. Software
Design Document. C. Payroll Register. D. Attendance Sheet.
Answer: B. Software Design
Document.
Rationale: A Software Design Document explains how
the approved requirements will be implemented by describing the system
architecture, modules, interfaces, data structures, and processing logic.
Unlike a user manual, it serves as a technical guide for developers during
implementation.
Question 24
A newly deployed statistical
system must continue operating even if one database server fails unexpectedly.
Which infrastructure capability MOST directly enables the system to continue
operating with minimal interruption?
A. Failover mechanism. B. Data
compression. C. File encryption. D. Screen resolution scaling.
Answer: A. Failover mechanism.
Rationale: A failover mechanism automatically
transfers processing to a standby server when the primary server becomes
unavailable, minimizing service interruption. It is a practical implementation
used to achieve resilient and continuously available information systems.
Question 25
Before approving deployment of a
newly developed statistical information system, management requests evidence
that every documented requirement has been tested successfully. Which quality
assurance technique BEST provides this evidence?
A. Code indentation review. B.
Memory utilization report. C. Network topology diagram. D. Requirements
traceability matrix.
Answer: D. Requirements
traceability matrix.
Rationale: A Requirements Traceability Matrix (RTM)
links every requirement to corresponding design elements, test cases, and test
results. It demonstrates that all specified requirements have been verified
before deployment, making it an essential quality assurance tool for large
information systems such as those used by NBS.
Question 26
A programmer is reviewing a
proposed information system and discovers that one process accepts data that
can never be produced by any preceding process. What does this MOST likely
indicate?
A. A missing data flow or
incorrect process design. B. Excessive processor utilization during execution. C.
Insufficient database normalization. D. Incorrect monitor resolution settings.
Answer: A. A missing data flow
or incorrect process design.
Rationale: Every process in a properly designed
information system must receive valid input from an external entity, data
store, or another process. If a process appears to consume data that no
preceding component generates, it indicates an inconsistency in the system
design or data flow. Detecting such logical gaps during analysis prevents
implementation errors and improves system reliability.
Question 27
An NBS application receives
census records from thousands of users simultaneously. Which database property
ensures that every completed transaction remains valid even when many users
access the database at the same time?
A. Scalability. B. Isolation. C.
Portability. D. Virtualization.
Answer: B. Isolation.
Rationale: Isolation is one of the ACID properties
of database transactions. It ensures that concurrent transactions do not
interfere with one another, preventing inconsistent or partially updated data
from being seen by other users. Scalability concerns growth, portability
relates to compatibility across platforms, and virtualization concerns resource
abstraction.
Question 28
A programmer develops a function
that calculates statistical averages. Another module later requires the same
calculation. Which approach BEST promotes software quality?
A. Rewrite the calculation
independently. B. Duplicate the original code. C. Reuse the existing function. D.
Perform the calculation manually.
Answer: C. Reuse the existing
function.
Rationale: Code reuse promotes consistency,
simplifies maintenance, and reduces the risk of introducing inconsistent logic.
If future modifications become necessary, only one function requires updating.
Duplicating or rewriting identical logic increases maintenance costs and the
likelihood of programming errors.
Question 29
While testing a new reporting
module, a programmer intentionally enters alphabetic characters into a field
that accepts only numeric values. What type of testing is primarily being
performed?
A. Performance testing. B.
Security auditing. C. Installation testing. D. Negative testing.
Answer: D. Negative testing.
Rationale: Negative testing intentionally provides
invalid or unexpected input to determine whether the application correctly
detects and rejects improper data. Robust systems must not only process valid
information but also safely handle invalid user input without crashing or
storing incorrect data.
Question 30
A systems analyst recommends
dividing a large application into several independent modules with clearly
defined responsibilities. What is the MAIN advantage of this approach?
A. It removes the need for
testing. B. It simplifies maintenance and future enhancements. C. It guarantees
zero programming errors. D. It eliminates database requirements.
Answer: B. It simplifies
maintenance and future enhancements.
Rationale: Modular software is easier to understand,
test, debug, and maintain because each component performs a specific function
independently. Changes made to one module are less likely to affect unrelated
parts of the system. Modularity improves software quality but does not
eliminate testing or prevent every programming error.
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