Two different logic gates moving output '0' for the inputs (0, 1) and then for (1, 0) are

The frequency of a given a.c. signal is 'N' Hz. When it is connected to a half wave rectifier, the number of output pulses given by the rectifier in 1 second is

Silicon and copper are cooled from 300 K to 100 K, the specific resistance (resistivity)

A transistor having $\alpha=0.8$ is connected in common emitter configuration. When the base current changes by 6 mA , then the change in collector current is