MCQs on Combinational Circuits
1. A combinational circuit
- always contain memory elements
- never contains memory elements
- may sometimes contain memory elements
- contain only memory elements
2. A logic gate is an electronic circuit which
- operates on boolean algebra
- performs arithmetic and logic functions
- allows flow of electrons only in one direction
- alternates between 0 and 1 values
3. Any combinational circuit can be designed using only
- AND gates
- NOR gates
- XOR gates
- NOT gates
4. ____ are an example of a combinational circuit.
- Shift registers
- Multiplexers
- Counters
- Flipflops
5. Hal adder is also known as
- NAND
- AND
- NOT
- XOR
6. In combinational circuits, output depends on ______
- Previous output
- Present inputs
- Previous inputs
- Both a & b
7. A full adder can be implemented by the following gates
- 2 XOR, 2 AND, 1 OR
- 2 XOR, 1 AND, 2 OR
- 1 XOR, 2 AND, 1 OR
- 2 XOR, 2 AND, 1 OR
8. The combination of two half adders is a _____
- full adder
- schmitt trigger
- comparator
- half adder
9. The only function of a NOT gate is
- invert an input signal
- act as a universal gate
- stop a signal
- none of the above
10. The output of a 2-input OR gate is zero only when its
- either input is 0
- either input is 1
- both inputs are 1
- both inputs are 0
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