Question

In a diode, the reverse current is practically not dependent on the applied voltage.

Hint:

In reverse bias, the current is negligible and does not change significantly with increasing reverse voltage, except when the breakdown voltage is reached.

Answer 1

In a p-n junction diode, when a reverse voltage is applied, very few charge carriers (electrons and holes) are available to conduct current. As a result, the reverse current is extremely small and is often referred to as the leakage current. 
The reverse current is practically independent of the applied reverse voltage, except when the reverse voltage exceeds the breakdown voltage of the diode, at which point the reverse current increases dramatically (due to avalanche or Zener breakdown). 
 For most practical purposes, the reverse current remains almost constant and very small, even with increasing reverse voltage, as long as the applied voltage does not exceed the breakdown voltage.