AIEEE 2006 Mock Test

The energy spectrum of $\beta$ -particles [number $N(E)$ as a function of $\beta$ -energy $E$ ] emitted from a radioactive source is:

When ${}_3{\text{Li}}^7$ nuclei are bombarded by protons, and the resultant nuclei are ${}_4{\text{Be}}^8$, the emitted particles will be:

A solid which is transparent to visible light and whose conductivity increases with temperature is formed by:

If the ratio of the concentration of electrons to that of holes in a semiconductor is $7/5$ and the ratio of currents is $7/4$, then what is the ratio of their drift velocities?

In a common base mode of a transistor, the collector current is $5.488\text{mA}$ for an emitter current of $5.60\text{mA}$. The value of the base current amplification factor ($\beta$) will be: