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MHT CET 202624 AprilMorning Shift
Exam
MHT CET
Year
2026
Date
24 April
Shift
Morning Shift
Subject
Physics
Chapter
Semiconductors

MHT CET 2026 · 24 April · Morning Shift · Physics · Semiconductors

Below we give four entries for the truth table of two point input...

Below we give four entries for the truth table of two point input OR gate. Which two are wrong?
ABYi101ii110iii001iv011\begin{array}{cccc} & A & B & Y\\ \text{i} & 1 & 0 & 1\\ \text{ii} & 1 & 1 & 0\\ \text{iii} & 0 & 0 & 1\\ \text{iv} & 0 & 1 & 1\end{array}

Options

  1. A(i) and (ii)
  2. B(ii) and (iii)
  3. C(iii) and (iv)
  4. D(iv) and (i)

Correct answer

B. (ii) and (iii)

Step-by-step solution

The Boolean expression for an OR gate is Y=A+BY = A + B.

Evaluating each given entry:

For (i): A=1,B=0⇒Y=1+0=1A = 1, B = 0 \Rightarrow Y = 1 + 0 = 1. This is correct.

For (ii): A=1,B=1⇒Y=1+1=1A = 1, B = 1 \Rightarrow Y = 1 + 1 = 1. The given value is 00, so this is wrong.

For (iii): A=0,B=0⇒Y=0+0=0A = 0, B = 0 \Rightarrow Y = 0 + 0 = 0. The given value is 11, so this is wrong.

For (iv): A=0,B=1⇒Y=0+1=1A = 0, B = 1 \Rightarrow Y = 0 + 1 = 1. This is correct.

The wrong entries are (ii) and (iii).

Answer: (ii) and (iii)
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