9th class unit 2 Computer Short Questions
Short Questions Answers
1. Define a Boolean Function.
A Boolean function is a logical expression that uses binary values (0 and 1) and gives an output of either
0 or 1.
Example: A AND B
2. What is the significance of the truth table in digital logic?
A truth table shows all possible input combinations and their outputs. It helps us understand how a logic
circuit works.
Example: An AND gate gives output 1 only when both inputs are 1.
3. Describe the function of a NOT gate with its truth table.
A NOT gate gives the opposite of the input. It changes 1 to 0 and 0 to 1.
Truth Table:
Input (A)
Output (A')
0
1
1
0
4. Write the purpose of ADC and DAC.
ADC (Analog to Digital Converter) converts analog signals into digital signals.
DAC (Digital to Analog Converter) converts digital signals into analog signals.
Example: A microphone uses ADC, while a speaker uses DAC.
