## 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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