JAMB and WAEC Computer Studies questions: Number systems and data representation

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

1. Question 41· Number systems and data representation· WAEC

   The binary number system uses the digits

   • A0 and 1
   • B0 to 9
   • C0 to 7
   • D0 to F

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   Explanation and discussion

2. Question 42· Number systems and data representation· JAMB

   How many different values can be represented with 8 bits?

   • A8
   • B255
   • C256
   • D128

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   Explanation and discussion

3. Question 43· Number systems and data representation· WAEC

   ASCII is a code for representing

   • Aimages only
   • Bcharacters as numbers
   • Csound
   • Dvideo

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   Explanation and discussion

4. Question 44· Number systems and data representation· WAEC

   The largest unsigned number that 8 bits can hold is

   • A8
   • B256
   • C127
   • D255

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   Explanation and discussion

5. Question 45· Number systems and data representation· JAMB

   Find 1010₂ + 0111₂.

   • A10111₂
   • B11101₂
   • C10001₂
   • D11001₂

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   Explanation and discussion

6. Question 46· Number systems and data representation· JAMB

   Subtract 0110₂ from 1101₂.

   • A1001
   • B0101
   • C1011
   • D0111

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   Explanation and discussion

7. Question 47· Number systems and data representation· JAMB

   The hexadecimal digit F represents the decimal value

   • A14
   • B16
   • C15
   • D10

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   Explanation and discussion