Waec Computer Science Past Questions For Year 2015

Question 11

The memory unit of the computer belongs to the?

waec 2015

• A. control unit     
• B.  input device      
• C. output device     
• D. system unit

Question 12

When signals X=0 and Y=1, signal Z is?

waec 2015

• A.  0.1.     
• B. 0    
• C.     1.      
• D. 0+1.

Question 13

X, Y and Z respectively, represents?

waec 2015

• A.  input, output and input signals.   
• B.  output, output and input signals     
• C.   output, input and output signals.     
• D.  input, input and output signals.

Question 14

Figure 1 is a logic gate. Use it to answer questions 12 to 14.

Figure 1 represents?

waec 2015

• A.  a NOT gate.     
• B.   a NAND gate
• C. an AND gate     
• D. an OR gate.

Question 15

Which of the following is not a mobile input device?

waec 2015

• A. Joystick     
• B. Light pen   
• C.  Mouse   
• D. Scanner