JAMB and WAEC Computer Studies questions

548 questions with answers and explanations. Tap an option to check yourself.

1. Question 461· Number systems and data representation· JAMB

   Find 1010₂ + 0111₂.

   • A10111₂
   • B11101₂
   • C10001₂
   • D11001₂

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   Answer: C. 10001₂

   Explanation and discussion

2. Question 462· Number systems and data representation· JAMB

   Subtract 0110₂ from 1101₂.

   • A1001
   • B0101
   • C1011
   • D0111

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   Answer: D. 0111

   Explanation and discussion

3. Question 463· Number systems and data representation· JAMB

   The hexadecimal digit F represents the decimal value

   • A14
   • B16
   • C15
   • D10

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   Answer: C. 15

   Explanation and discussion

4. Question 464· Programming languages and BASIC· WAEC

   A programmer translates her whole C++ program once and then runs the machine code many times. She used

   • Aan assembler
   • Ban interpreter
   • Ca compiler
   • Da debugger

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   Answer: C. a compiler

   Explanation and discussion

5. Question 465· Programming languages and BASIC· WAEC

   A program that runs but gives wrong results has a

   • Asyntax error
   • Blogic error
   • Ccompilation error
   • Dtyping speed problem

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   Answer: B. logic error

   Explanation and discussion

6. Question 466· Programming languages and BASIC· WAEC

   Which of these is a high-level language?

   • Aassembly language
   • Bmachine code
   • CPython
   • Dbinary

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   Answer: C. Python

   Explanation and discussion

7. Question 467· Programming languages and BASIC· JAMB

   In an array A of 10 elements indexed from 1, A(4) refers to

   • Athe last element
   • Bthe first element
   • Cfour elements
   • Dthe fourth element

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   Answer: D. the fourth element

   Explanation and discussion

8. Question 468· Programming languages and BASIC· JAMB

   An error that breaks the grammar rules of a programming language is

   • Aa logic error
   • Ba syntax error
   • Ca hardware fault
   • Da power failure

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   Answer: B. a syntax error

   Explanation and discussion

9. Question 469· Programming languages and BASIC· WAEC

   An advantage of high-level languages over machine language is that they are

   • Aeasier to learn and understand
   • Bexecuted directly without translation
   • Cwritten only in 0s and 1s
   • Dfaster to run in every case

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   Answer: A. easier to learn and understand

   Explanation and discussion

10. Question 470· Programming languages and BASIC· JAMB

    Assembly language uses

    • Aflowchart symbols
    • Bonly 0s and 1s
    • Cplain English sentences
    • Dmnemonics such as ADD and MOV

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    Answer: D. mnemonics such as ADD and MOV

    Explanation and discussion

11. Question 471· Programming languages and BASIC· JAMB

    An array is

    • Aa single variable
    • Ba collection of items of the same type stored under one name
    • Can error
    • Da loop

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    Answer: B. a collection of items of the same type stored under one name

    Explanation and discussion

12. Question 472· Programming languages and BASIC· WAEC

    Which language can a computer's processor execute directly without translation?

    • APython
    • Bmachine language
    • CBASIC
    • Dassembly language

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    Answer: B. machine language

    Explanation and discussion

13. Question 473· Programming languages and BASIC· JAMB

    BASIC stands for

    • ABinary Assembly Standard Instruction Code
    • BBasic Algorithmic System of Integrated Codes
    • CBeginner's All-purpose Symbolic Instruction Code
    • DBeginner's Applied Software Integrated Code

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    Answer: C. Beginner's All-purpose Symbolic Instruction Code

    Explanation and discussion

14. Question 474· Programming languages and BASIC· JAMB

    In BASIC, REM is used to

    • Aend the program
    • Bread data
    • Crepeat a loop
    • Dwrite comments

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    Answer: D. write comments

    Explanation and discussion

15. Question 475· Programming languages and BASIC· WAEC

    An assembler converts

    • Aassembly language into machine code
    • Bhigh-level language into English
    • Cmachine code into pictures
    • Ddata into information

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    Answer: A. assembly language into machine code

    Explanation and discussion

16. Question 476· Programming languages and BASIC· WAEC

    A translator that translates and executes a program line by line is an

    • Ainterpreter
    • Bcompiler
    • Cassembler
    • Deditor

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    Answer: A. interpreter

    Explanation and discussion

17. Question 477· Programming languages and BASIC· WAEC

    A disadvantage of machine language is that it is

    • Aportable to all computers
    • Btranslated by a compiler
    • Cclose to English
    • Ddifficult to write and machine-dependent

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    Answer: D. difficult to write and machine-dependent

    Explanation and discussion

18. Question 478· Programming languages and BASIC· JAMB

    A compiler translates

    • Amachine code into English
    • Bone line at a time
    • Ca whole high-level program into machine code before execution
    • Dassembly into flowcharts

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    Answer: C. a whole high-level program into machine code before execution

    Explanation and discussion

19. Question 479· Programming languages and BASIC· JAMB

    Object-oriented programming is based on

    • Aflowcharts only
    • Bobjects that combine data and methods
    • Cmachine code
    • Dpunched cards

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    Answer: B. objects that combine data and methods

    Explanation and discussion

20. Question 480· Programming languages and BASIC· JAMB

    Machine language consists of

    • Amnemonics such as ADD
    • BEnglish-like words
    • Cbinary digits 0 and 1
    • Dpictures and icons

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    Answer: C. binary digits 0 and 1

    Explanation and discussion