PractifyUs

NEET Physics · Electronic Devices

Logic gates

Taught in NCERT Class 12 Physics, Chapter 14: Semiconductor Electronics: Materials, Devices and Simple Circuits.

1 verified question: Easy 0 · Medium 1 · NEET level 0

Sample questions

Sample 1Medium

A logic circuit shows inputs A and B fed into an OR gate, whose output goes into a NOT gate, giving the final output Y. For which inputs is Y = 1?

  1. A

    A = 1, B = 1 only

  2. B

    A = 0, B = 0 only

  3. C

    A = 0, B = 1 or A = 1, B = 0

  4. D

    Whenever at least one input is 1

Show the answer
The answer is B.

OR followed by NOT is a NOR gate. The OR output is 0 only when both inputs are 0, so Y = 1 only for A = B = 0.

  • A.

    Y = 1 only when both inputs are 1 describes an AND gate.

  • C.

    Y = 1 for one high input only describes an XOR output.

  • D.

    Y = 1 when at least one input is 1 is the OR output before inversion.

NCERT: Class 12 Physics, Chapter 14

Practise Logic gates

Practice at the level you choose, with the answer after every question; timed tests with the answers when you submit. Every question is verified against NCERT first.

Sign in to practise

More in Electronic Devices