Question

1. which type of vertical coupling will block any input from being displayed for the selected channel?

a gnd
b ac
c dc
d alt

Explanation:

In oscilloscopes, when the vertical - coupling is set to GND, it connects the input terminal to ground, effectively blocking any input signal from being displayed for the selected channel. AC coupling blocks the DC component but allows AC signals, DC coupling allows both AC and DC signals, and ALT is a triggering mode, not a coupling type for blocking input display.

Answer:

A. GND