Which planet is more than one astronomical unit from the sun?
a. mars
b. earth
c. venus
d. mercury

What color of light must blue light mix with to create white light? a. yellow b. white c. blue d. green

The percent efficiency of a machine can never be 100% (or greater), because in the real world some energy is always converted into a. heat b. work c. input force d. output force

From the perspective of an employee that effective channeling of work related information and concerns