The piece of lab equipment seen here produces vibrations that in turn produce sound. The device is called a

The Answer is a tuning fork.

Explanation:

A tuning fork makes sound when you strike it against a surface or object, which creates vibrations. Basically, the vibrations that an outside force creates with the tuning fork makes the fork produce sound.

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either a donut or a sphere or a pancake or a flat sphere. it depends on where the vertical line is.

if the line goes through the center of the circle and is perpendicular to a diameter containing the center, then you get a flat circle.

if the line and the diameter of a the circle meet in the center of the diameter and at an angle, you get a pancake.

if the line is on the circumference of the circle and is at right angles   to the circle you get a ring.

if the line contains the diameter, you get a sphere.

the the line is parallel to the diameter and touches the circumference, you get a donut.