AIPMT 2011 Preliminary Mock Test

A nucleus ${}_n^{m}X$ emits one $\alpha$ particle and two $\beta$ -particles. The resulting nucleus is:

A transistor is operated in common emitter configuration at $V_C=2\text{V}$ such that a change in the base current from $100\mu \text{A}$ to $300\mu \text{A}$ produces a change in the collector current from $10\text{mA}$ to $20\text{mA}$. The current gain is:

If a small amount of antimony is added to germanium crystal:

In forward biasing of the $p$ -$n$ junction:

Symbolic representation of four logic gates are shown as:(i) OR gate AND gate NOT gate [NAND gate]Pick out which ones are for AND, NAND and NOT gates, respectively: