Computer-Studies Exam Past Questions and Answers | JAMB, WAEC and NECO

Computer Studies covers general knowledge of computers, computing terms, and technologies. It focuses on building interest and confidence in using computers.

• Question 151:

  When does the output of a NAND gate =1?

  Options:
  A) whenever a 0 is present at an input
  B) only when all input =0
  C) whenever 1 is present at an input
  D) only when all input =1
  Show Answer
  The correct answer is A .
• Question 152:

  Which of the following is an example of output device

  Options:
  A) Keyboard
  B) Mouse
  C) speaker
  D) microphone
  Show Answer
  The correct answer is C .
• Question 153:

  At least how many keys is a keyboard made up of?

  Options:
  A) 105
  B) 107
  C) 101
  D) 103
  Show Answer
  The correct answer is C .
• Question 154:

  Which of the following is not a type of logic gate

  Options:
  A) XOR
  B) OR
  C) AND
  D) DOR
  Show Answer
  The correct answer is D .
• Question 155:

  what is the first computing machine invented ?

  Options:
  A) slide rule
  B) Pascal calculator
  C) Napier bones
  D) Abacus
  Show Answer
  The correct answer is D .
• Question 156:

  What is the shortcut key to "undo" last action on a Microsoft word page?

  Options:
  A) Ctrl + A
  B) Ctrl + U
  C) Ctrl + X
  D) Ctrl + Z
  Show Answer
  The correct answer is D .
• Question 157:

  Encryption helps with what?

  Options:
  A) Spam messages
  B) identify source of message
  C) Safe delivery of messages to destination without being accessed by a third party
  D) interpretation of message and digital data
  Show Answer
  The correct answer is C .
• Question 158:

  What part of the central processing unit coordinates other units and manages the computer resources ?

  Options:
  A) coordinating unit
  B) Memory unit
  C) Arithmetic Logic unit
  D) Control unit
  Show Answer
  The correct answer is D .
• Question 159:

  Using Boolean identities, reduce the given Boolean expression:
  A(A+1) + A(B+0) + C.1

  Options:
  A) A + B + C
  B) A.B.C
  C) A.B + C
  D) A + C
  Show Answer
  The correct answer is D .
• Question 160:

  which communication channel allows the sending of information in one direction only?

  Options:
  A) simplex mode
  B) half duplex mode
  C) duplex mode
  D) full duplex mode
  Show Answer
  The correct answer is A .