Question

which sentence uses this meaning of dial?
dial noun a knob on an electronic device
which dial do i turn to sharpen the image on the screen?
if you have any questions, dial the number at the bottom of the screen.

Explanation:

To determine which sentence uses "dial" as a noun meaning "a knob on an electronic device", we analyze each option:

• In "Which dial do I turn to sharpen the image on the screen?", "dial" is a noun referring to the knob (on a device like a TV/monitor) that's turned, matching the definition.
• In "If you have any questions, dial the number at the bottom of the screen", "dial" is a verb (to make a phone call by entering a number), not a noun referring to a knob.

Answer:

Which dial do I turn to sharpen the image on the screen?