4. Inside a harpsichord, hammers strike the strings to produce sound.
true
false

False

Explanation:

The piano is an instrument where hammers strike the strings to produce sound. The harpsichord makes sounds by a system of levers plucking their strings.

the correct answer for this question is:

it is system invented in 1872 that produced the first illusion of movement. basically it was a disk with a series of drawings around the edge, showing the same object in slightly different poses. when it was spun, it created the illusion of movement.

found this online : )