JAMB and WAEC Computer Studies questions

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

All topics Algorithms and flowcharts · 39 Application packages · 46 Computer hardware and the CPU · 41 Computer networks and the internet · 45 Computer security, ethics and safety · 40 Data processing and information · 40 Evolution of computing · 42 Input and output devices · 40 Logic gates and Boolean algebra · 39 Memory and storage devices · 44 Number systems and data representation · 47 Programming languages and BASIC · 43 Software and operating systems · 42

Question 421· Number systems and data representation· JAMB
Find the 4-bit two's complement of 0101.
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Answer: C. 1011
Explanation and discussion
Question 422· Number systems and data representation· WAEC
Convert the hexadecimal number 2F to base ten.
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Answer: C. 47
Explanation and discussion
Question 423· Number systems and data representation· JAMB
Convert 1010 1010₂ to hexadecimal.
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Answer: A. AA
Explanation and discussion
Question 424· Number systems and data representation· JAMB
Convert 37₁₀ to binary.
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Answer: B. 100101
Explanation and discussion
Question 425· Number systems and data representation· WAEC
Convert 25 (base 8) to base 10.
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Answer: C. 21
Explanation and discussion
Question 426· Number systems and data representation· WAEC
Convert 10110₂ to hexadecimal.
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Answer: C. 16₁₆
Explanation and discussion
Question 427· Number systems and data representation· JAMB
ASCII is a code used to represent
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Answer: D. characters as binary numbers
Explanation and discussion
Question 428· Number systems and data representation· WAEC
Convert 17 (base 8) to base 10.
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Answer: B. 15
Explanation and discussion
Question 429· Number systems and data representation· JAMB
The two's complement of 0011 (4 bits) is
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Answer: C. 1101
Explanation and discussion
Question 430· Number systems and data representation· WAEC
Add the binary numbers 101 + 11.
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Answer: A. 1000
Explanation and discussion
Question 431· Number systems and data representation· WAEC
Add the binary numbers 101 and 011.
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Answer: D. 1000
Explanation and discussion
Question 432· Number systems and data representation· JAMB
Add 47₈ and 25₈, giving the answer in octal.
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Answer: A. 74₈
Explanation and discussion
Question 433· Number systems and data representation· JAMB
Convert 3F₁₆ to decimal.
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Answer: C. 63
Explanation and discussion
Question 434· Number systems and data representation· WAEC
Convert 2A (base 16) to base 10.
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Answer: C. 42
Explanation and discussion
Question 435· Number systems and data representation· WAEC
Convert 1101 (base 2) to base 10.
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Answer: C. 13
Explanation and discussion
Question 436· Number systems and data representation· WAEC
The hexadecimal digit F represents the denary value
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Answer: A. 15
Explanation and discussion
Question 437· Number systems and data representation· JAMB
Convert 56₈ to base ten.
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Answer: A. 46
Explanation and discussion
Question 438· Number systems and data representation· JAMB
Unicode was developed to
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Answer: B. represent characters of most world languages
Explanation and discussion
Question 439· Number systems and data representation· JAMB
A parity bit is added to data in order to
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Answer: C. detect errors in transmission
Explanation and discussion
Question 440· Number systems and data representation· JAMB
Convert 45 (base ten) to binary.
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Answer: B. 101101
Explanation and discussion

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JAMB and WAEC Computer Studies questions

Find the 4-bit two's complement of 0101.

Convert the hexadecimal number 2F to base ten.

Convert 1010 1010₂ to hexadecimal.

Convert 37₁₀ to binary.

Convert 25 (base 8) to base 10.

Convert 10110₂ to hexadecimal.

ASCII is a code used to represent

Convert 17 (base 8) to base 10.

The two's complement of 0011 (4 bits) is

Add the binary numbers 101 + 11.

Add the binary numbers 101 and 011.

Add 47₈ and 25₈, giving the answer in octal.

Convert 3F₁₆ to decimal.

Convert 2A (base 16) to base 10.

Convert 1101 (base 2) to base 10.

The hexadecimal digit F represents the denary value

Convert 56₈ to base ten.

Unicode was developed to

A parity bit is added to data in order to

Convert 45 (base ten) to binary.