Scientific Knowledge — Unit test Answers

Which best describes the current model of the atom?

View the model of the rover Curiosity. Which classification best applies to this model?

Cars powered by hydrogen fuel cells emit which substance?

Which best blocks X-ray particles and can therefore be observed more closely through the use of this technology?

When people look through a telescope, air currents in the Earth’s atmosphere can distort the images they see. In the 1950s, a scientist named H. W. Babcock thought of a way to reduce this distortion by using a special device within the telescope. However, this device was not used until the 1990s.Which best explains why Babcock’s idea took many years to become a reality?

Which model is most likely used to show something that happens too slowly to see?

Mia uses the formula πr2 to find the area of a circle. What is πr2 an example of?

The Port of Houston is one of the busiest ports in the country. The U.S. Department of Energy gave this port $3.4 million to operate twenty heavy-duty hydrogen hybrid fuel cell powered trucks around the port.Which is the most likely reason the U.S. government made such an investment?

Which elements do hydrogen fuel cells combine to produce electricity?

View the model of the United States. Which is a likely limitation of this model?