The conversion of readable data to unreadable codes in order to prevent unauthorised access is known as?

• A. authentication
• B. encryption
• C. encoding
• D. decryption

A logic gate contains three input variables. The total possible combination of the input variables is?

• A. 3
• B. 4
• C. 8
• D. 12

The algebraic equation for the AND gate with input variables A and B is?

• A. X = A.B
• B. X =A/B
• C. X= A-B
• D. X = A+B

Which of the following options is a biometric data?

• A. Gender
• B. Password
• C. Date of birth
• D. Pattern of eye iris

The most important system software in a computer system is the?

• A. control program
• B. language translator
• C. operating system
• D. utility programs

The command line prompt of MS-DOS operating system is represented as?

• A. C:>
• B. C:\
• C. C:\>
• D. C\:>

Which of the following output devices was common among the computing devices of the 19th century?

• A. Monitor
• B. Plotter
• C. Printer
• D. Speaker

The MS-Windows shortcut keys to initiate warm booting is?

• A. Alt+ f4
• B. Ctrl+ Alt + Del
• C. Ctrl+Esc
• D. Ctn +Shift + Del

(a) Define logic gate.

(b) Give one example each of: (i) standard logic gate; (ii) alternative logic gate.

(c) Using P and Q as inputs and R as output:

(i) draw the logic symbol for an XOR logic gate: (ii) construct the truth table for XOR logic gate.

(d) List two uses of a logic gate.

Which of the following components are data communication equipment? I. Scanner ll. Hub lIl. Modem

• A. I and Il only
• B. I and lll only
• C. II and IIl only
• D. I, Il and III