Digital Electronics
While using a frequency counter for measuring frequency, two modes of measurement are possible. 1. Period time 2. Frequency mode There is a ‘cross-over frequency’ below which the period mode is preferred. Assuming the crystal oscillator frequency to be 4Mhz the crossover frequency is given by

 2 Khz
 2 Mhz
 8 Mhz
 1 Khz

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Digital Electronics
Positive logic in a logic circuit is one in which

logic 0 and 1 are represented by 0 and positive voltage respectively
logic 0 voltage level is higher than logic 1 voltage level
logic 0 and, -1 are represented by negative and positive voltages respectively
logic 0 voltage level is lower than logic 1 voltage level.

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