Unit Test — Cumulative exam Answers

Which provides resistance in an electric circuit?

Which condition must be met for conduction to occur?

A component of a circuit changes, as shown below.

Masako measures a circuit at 12 V and 2 A. Using Ohm's law, what can he calculate for the circuit?

Which do sound waves travel fastest through?

Carlota does 2000 J of work on a machine. The machine does 500 J of work. What is the efficiency of the machine?

The total energy in a system is 675 J. The kinetic energy changes from 296 J to 432 J. Which statement best describes the potential energy of this system?

Based on illustrations of magnetic field lines, where could an object be placed so it would not experience a magnetic force?

Look at the circuit diagram.

The diagram shows two charged objects, A and B.

Which indicates that thermal energy is no longer being transferred from boiling water to a mug?

Which waves can travel through space?

Ryan is examining the energy of the particles in a bar of gold. What is Ryan most likely studying?

At which temperature does water have particles with a greater average kinetic energy than water with a temperature of 30°C?

As the temperature of a medium increases, the speed of the sound wave

In which direction of the wave motion do longitudinal waves transfer energy?

Which types of electromagnetic waves have wavelengths that are longer than those of visible light but shorter than those of microwaves?

Which trait shared by dolphins and bats possibly led to the evolution of echolocation in these two animal groups?

The table shows the dimensions of four wedges.

Dr. Eriksson is working on a material called selenium. She is adding a certain number and type of atoms to the selenium, which will control its conductivity.