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100+ Free BCS Written Computer Science Practice Questions

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Key Facts: BCS Written Computer Science Exam

971

BPSC subject code for Computer Science

Official BCS written syllabus PDF

200 marks

Post-related Computer Science paper (Part I 100 + Part II 100)

Official BCS written syllabus PDF

50% aggregate

Written-stage pass standard on the 900-mark exam

BPSC BCS examination page

Tk. 200 / Tk. 50

50th BCS general / reduced application fee (no separate written fee)

50th BCS circular reporting citing PSC

4 hours

Duration used here for BPSC 200-mark written papers (confirm routine)

Longstanding BPSC sitting practice

Descriptive

Official item type; this bank is an English MCQ study adaptation

BPSC written syllabus structure

BPSC Computer Science (code 971) is a 200-mark, typically 4-hour descriptive written paper (Part I 100 / Part II 100) inside the 900-mark BCS written stage (50% aggregate; per-paper minima also apply). Fee is the single BCS application (50th BCS: Tk. 200 general / Tk. 50 reduced). This page is a free English MCQ study adaptation, not an official-paper simulation.

Sample BCS Written Computer Science Practice Questions

Try these sample questions to test your BCS Written Computer Science exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1In C, after `#define SQR(x) x*x`, what does `SQR(2+3)` evaluate to?
A.25
B.11
C.13
D.10
Explanation: The macro substitutes text, so `SQR(2+3)` becomes `2+3*2+3`. Multiplication binds first, giving 2+6+3=11, not a squared sum. Parenthesize macro arguments and the whole replacement as `#define SQR(x) ((x)*(x))` to get 25.
2Which C storage class gives a local variable lifetime for the entire program while restricting its name to the block?
A.auto
B.static
C.register
D.extern
Explanation: A block-scope `static` variable is initialized once and retains its value between calls, but its identifier is not visible outside that block. That combination of program lifetime and local linkage/visibility is unique among the four storage-class specifiers listed.
3What is printed? `int x = 5; int *p = &x; *p = 12; printf("%d", x);`
A.5
B.12
C.the address of x
D.undefined behavior
Explanation: `p` holds the address of `x`, so `*p = 12` writes 12 into `x`. Printing `x` therefore shows 12. This is ordinary pointer dereference, not undefined behavior.
4In object-oriented programming, hiding an object’s representation and exposing only a controlled interface is called:
A.inheritance
B.encapsulation
C.polymorphism
D.overloading
Explanation: Encapsulation bundles data with the operations that maintain it and hides representation behind an interface (C++ `private`/`public`, Java access modifiers). It is distinct from reuse-by-extension (inheritance) and from one interface with many implementations (polymorphism).
5The size of a C `union` with members `char c; int i; double d;` is determined by:
A.the sum of the member sizes
B.the size of the largest member, plus any alignment padding required by the union
C.the size of the first member
D.always 8 bytes
Explanation: All union members overlay the same storage. The union’s size is at least the largest member and is rounded up so that the union’s alignment (the strictest member alignment) is satisfied. That is why size can exceed `sizeof(double)` on some ABIs.
6In C++, a virtual function is resolved at:
A.preprocess time using macros
B.run time from the dynamic type of the object
C.compile time from the pointer’s static type only
D.link time from the first definition in the archive
Explanation: Virtual dispatch uses the object’s vtable (or equivalent) so a call through a base pointer/reference invokes the override that matches the actual derived object. That is runtime (dynamic) polymorphism, which the BCS OOP syllabus groups with inheritance.
7A C function should return a pointer to a newly allocated string. Which approach is defined and correct?
A.return the address of a local `char buf[64]` filled with strcpy
B.return `&s[0]` for a caller-supplied `char s[]` that was never passed in
C.return a pointer to a string literal after writing into that literal
D.malloc the buffer, strcpy into it, and return the pointer (caller frees)
Explanation: Heap allocation with `malloc` (or `strdup`) outlives the function; the caller owns and later `free`s the pointer. Returning `&` of a local array dangles; writing a string literal is undefined; you cannot return a caller buffer you were never given.
8C++ function templates are instantiated:
A.once for the program, using void* internally
B.by the compiler for each distinct set of template arguments used
C.by the preprocessor before parsing
D.only if the template is declared virtual
Explanation: A function template is a compile-time pattern. The compiler generates a concrete function for each unique argument list (for example `max<int>` and `max<double>`). That is the “template functions and classes” topic on the BPSC Computer Science syllabus.
9The hexadecimal value `0x2A` equals which unsigned decimal integer?
A.32
B.42
C.40
D.52
Explanation: Hex `2A` is 2×16 + 10 = 32 + 10 = 42. Digit A is ten in hexadecimal. This is the number-system conversion expected in the digital-systems part.
10Which gate is functionally complete by itself (a universal gate)?
A.AND
B.OR
C.XOR
D.NAND
Explanation: NAND (and NOR) can implement NOT, AND, and OR, so any Boolean function can be built from NAND alone. AND, OR, and XOR are not universal without a source of inversion.

About the BCS Written Computer Science Exam

Computer Science is the BPSC BCS written post-related paper, subject code 971, Total Marks 200. The official name is Computer Science, not a separate Computer Science and Engineering paper. It is sat by technical/professional (and dual-cadre) applicants whose post lists this subject. The official paper is descriptive in two 100-mark parts covering programming, digital systems, discrete math, numerical methods, data structures, microprocessors, computer organization, compilers, algorithms, operating systems, DBMS, software engineering, data communication, networks, and AI. This free bank is an English-language MCQ study adaptation of that syllabus—not an official translation, format simulation, or substitute for handwritten answers. After written, BPSC's page still lists a 200-mark viva with 50% pass; news since the 47th BCS has reported a 100-mark viva. Confirm the circular.

Assessment

BPSC post-related Computer Science (subject code 971), Total Marks 200, in two equal parts. Part I (100): programming, digital systems, discrete mathematics, numerical analysis, data structures, microprocessor and interfacing, computer organization, compiler and theory of computation. Part II (100): algorithms, operating systems, DBMS, software engineering, data communication, computer networks and the Internet, artificial intelligence. Official items are descriptive. This bank is an English-language MCQ study adaptation, not a translation or sitting simulation. Technical/professional cadre written total is 900 marks including this 200-mark paper; dual-cadre applicants sit the extra post-related paper.

Time Limit

4 hours is the duration used for BPSC 200-mark written papers on this site and in longstanding BPSC sitting practice; confirm the current routine

Passing Score

50% aggregate on the 900-mark written examination (BPSC page); per-paper minima also apply as set by BPSC. Confirm the current circular.

Exam Fee

Tk. 200 general (50th BCS); Tk. 50 for ethnic minority, persons with disabilities, and third-gender applicants; no separate written or viva fee. Confirm the live circular. (Bangladesh Public Service Commission (BPSC))

BCS Written Computer Science Exam Content Outline

50%

Part I (Marks 100)

Computer programming (C and introductory C++/Java OOP), digital systems, discrete mathematics, numerical analysis, data structures, microprocessor and interfacing (8086 family), computer organization and architecture, compiler and theory of computation.

50%

Part II (Marks 100)

Algorithms and complexity, operating systems, database management systems, software engineering, data communication, computer networks and the Internet, and artificial intelligence.

How to Pass the BCS Written Computer Science Exam

What You Need to Know

  • Passing score: 50% aggregate on the 900-mark written examination (BPSC page); per-paper minima also apply as set by BPSC. Confirm the current circular.
  • Assessment: BPSC post-related Computer Science (subject code 971), Total Marks 200, in two equal parts. Part I (100): programming, digital systems, discrete mathematics, numerical analysis, data structures, microprocessor and interfacing, computer organization, compiler and theory of computation. Part II (100): algorithms, operating systems, DBMS, software engineering, data communication, computer networks and the Internet, artificial intelligence. Official items are descriptive. This bank is an English-language MCQ study adaptation, not a translation or sitting simulation. Technical/professional cadre written total is 900 marks including this 200-mark paper; dual-cadre applicants sit the extra post-related paper.
  • Time limit: 4 hours is the duration used for BPSC 200-mark written papers on this site and in longstanding BPSC sitting practice; confirm the current routine
  • Exam fee: Tk. 200 general (50th BCS); Tk. 50 for ethnic minority, persons with disabilities, and third-gender applicants; no separate written or viva fee. Confirm the live circular.

Keys to Passing

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

BCS Written Computer Science Study Tips from Top Performers

1Treat Part I and Part II as equal 100-mark halves; do not skip digital systems, numerical methods, or compilers because programming and networks feel more familiar.
2For C, practise tracing pointers, macros, and storage duration on paper the way a descriptive answer would show working.
3For algorithms and OS, write complexity and Gantt/page-replacement workings in full; the official paper is not MCQ.
4For DBMS, be ready to normalize a relation to 3NF/BCNF and to write SQL, not only name the normal forms.
5Use this MCQ bank to lock definitions and calculations, then write timed descriptive answers from the official BPSC syllabus PDF.

Frequently Asked Questions

What is BPSC subject code 971?

It is the BCS written post-related paper officially named Computer Science, Total Marks 200, in two 100-mark parts. BPSC does not list a separate Computer Science and Engineering paper under this code.

Is the official Computer Science paper multiple choice?

No. It is a 200-mark descriptive written examination. This bank is an English-language MCQ study adaptation of the syllabus, not an official translation, format simulation, or substitute for writing practice.

Who sits the Computer Science post-related paper?

Technical and professional cadre applicants whose post requires Computer Science, and dual-cadre applicants who must sit the extra 200-mark post-related paper, after qualifying in the BCS Preliminary Test of the same cycle.

What is the written pass standard?

BPSC's examination page requires 50% aggregate on the 900-mark written examination. Per-paper minima also apply as set by BPSC. Confirm the current circular.

How long is the paper?

Four hours is the duration used for BPSC 200-mark written papers on this site and in longstanding BPSC sitting practice. Always confirm the published routine for your cycle.

Is there a separate fee for the written Computer Science paper?

No. The 50th BCS application fee (Tk. 200 general; Tk. 50 for ethnic minority, persons with disabilities, and third-gender applicants) covers preliminary, written, and viva. Confirm the live circular on Teletalk.

What does the viva carry?

The official BPSC page still lists viva voce as 200 marks with a 50% pass mark. Reporting from the 47th BCS onward has described a 100-mark viva, and PSC has discussed reducing it further. Use the circular in force for your cycle.

In what language is this practice bank?

This is an original English-language MCQ study adaptation. Official BCS written answers may be in Bangla or English as the paper and circular allow. The bank is not an official translation or a simulation of the exam-hall language environment.