Question

what is the function of the pan on a triple beam balance?
to slide the riders
to hold the object being weighed
to adjust the zero mark
to measure the mass of the object.

Explanation:

A triple beam balance is a device used to measure mass. The pan is the flat, horizontal part of the balance. Its main purpose is to hold the object whose mass is being measured. Riders are slid on the beams (not on the pan) to balance the mass. Adjusting the zero mark is done using a knob (not the pan). Measuring the mass is the overall function of the balance, and the pan is just the part that holds the object during this measurement process.

Answer:

To hold the object being weighed