Q179 / 180 · COMEDK 2012 · Physics

Choose the correct statement.

  • A
    A $p$-type semiconductor is positively charge(d)
  • Correct answer
    B
    The Boolean expression $1 \cdot 0=0$.
  • C
    The majority carrier in $n$-type semiconductor is hole.
  • D
    A transistor cannot be used as a switch.

Solution

As per Boolean postulates, $$ \begin{aligned} 1 \cdot A &=A \\ \Rightarrow \quad 1 \cdot 1=1 \text { and } 1 \cdot 0 &=0 \end{aligned} $$ $p$-type semiconductor is electrically neutral. The majority charge carriers in $n$-type semiconductor are electrons. A transistor can be used as a switch.

Hence, the correct answer is option: 'B'.

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