35 Important MCQs on CMOS VLSI

What does CMOS stand for?

• Complementary Metal-Oxide Semiconductor

• Complex Metal-Oxide Semiconductor

• Central MOS

• Common Metal-Oxide Substrate

Which of the following devices are used in CMOS technology?

• Only NMOS

• Only PMOS

• Bipolar junction transistors

• Both NMOS and PMOS

The main advantage of CMOS over TTL is:

• Faster speed

• Higher power consumption

• Lower power consumption

• Higher cost

In CMOS, when both NMOS and PMOS are off, the output is:

• High

• Low

• Floating

• Undefined

Which of the following is NOT a characteristic of CMOS?

• Low static power consumption

• High noise margin

• High speed

• High static power consumption

In a CMOS inverter, the PMOS transistor is ON when:

• Input is low

• Input is high

• Output is high

• Output is low

The output of a CMOS inverter is:

• Same as input

• Always high

• Inverted version of the input

• Undefined

What is the logic function of a CMOS NAND gate?

• A·B

• A + B

• NOT(A·B)

• NOT(A + B)

Which logic gate consumes the least power in CMOS?

• NOR

• NAND

• XOR

• Inverter

What happens to power consumption when the switching activity increases in CMOS?

• Decreases

• Increases

• Remains same

• Power = 0