Question

grammar (change the voice).
1.a delicate instrument which record movement of the ground

Answer 1

MOVEMENT OF THE GROUND IS RECORDED BY THIS DELICATE INSTRUMENT

Answer 2

Active: A delicate instrument records the movement of the ground.

Passive: The movement of the ground is recorded by a delicate instrument.

As you probably know, the instrument mentioned is a seismometer.

Also, definitions of words tend to sound awkward in passive voice. Even if it’s grammatically correct, it isn’t idiomatic.
That’s why I’ve rewritten both the active and passive forms as proper-sounding sentences.

If I attempted to write the original sentence in the question in passive voice, it would turn out to be something like:
The movement of the ground which is recorded by a delicate instrument.

-which ultimately changes the meaning of the sentence.

So yeah, avoid dealing with such questions. If you do stumble upon such a sentence that has been framed like a definition (which I highly doubt will happen), just write it as a proper-sounding sentence.