Assertion : The conductivity of an intrinsic semiconductor depends on its temperature.
Reason : No important electronic devices can be developed using intrinsic semiconductors.

Figure shows the symbolic representation of 

What is rectification? Explain the working of a bridge rectifier.

The following figure shows two identical triode tubes connected in parallel. The anodes are connected together, the grids are connected together and the the cathodes are connected together. Show that the equivalent plate resistance is half of the individual plate resistance, the equivalent mutual conductance is double the individual mutual conductance and the equivalent amplification factors is the same as the individual amplification factor.