Which Boolean expression represents OR?
- A + B
- A · B
- NOT A
- A − B
Answer / جواب
A + B
Class 9 Computer Science Chapter 3 MCQs — Digital Systems and Logic Design
Class 9 Computer Science · Chapter 3 · Chapter practice
Practise this chapter online, check each answer and review your result. The current bank contains 40 objective questions for this chapter and medium.
Sample practice questions
What is the dual of the Boolean identity A · 0 = 0?
- A + 0 = 0
- A · 1 = 0
- NOT A = 0
- A + 1 = 1
Answer / جواب
A + 1 = 1
When does a two-input AND gate output 1?
- Whenever at least one input is 0
- Only when the inputs differ
- When both inputs are 1
- When both inputs are 0
Answer / جواب
When both inputs are 1
Which gate generates the carry output of a half-adder?
- NAND alone
- AND
- NOT
- OR alone
Answer / جواب
AND
Printable practice
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