Why are scientists most likely working on developing cleaner-burning fuel for cars?

• to increase fuel consumption

• to increase fuel production

• to reduce noise pollution

• to reduce air pollution

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Which is the most likely reason why scientists change a model?

• The public wants to understand a concept more easily.

• Students need illustrated models in a study guide.

• New discoveries makes the current model inaccurate.

• Current models may be uninteresting.

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Which scientific tool helps to make distant objects appear nearer and larger?

• a microscope

• a telescope

• a telescope

• an ultrasound

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

• organs

• muscles

• fluids

• bones

Which observation tool allows Shauna’s doctor to monitor her blood circulation in real-time?

• a microscope

• a telescope

• an X-ray

• an ultrasound

The robotic rover Curiosity has instruments that detect radiation both inside the spacecraft and in the Mars environment. What is most likely the purpose of this radiation detection?

• to determine whether human exploration of Mars is possible

• to develop better X-ray technology

• to find evidence of once-living Martian microorganisms

• o investigate evidence of hydrogen and water

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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?

• 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?

• Scientists started using electron microscopes instead.

• Scientific telescopes were already using advanced technology.

• Scientific ideas often have to wait until advancements in technology make the ideas possible.

• Scientists often feel their ideas place an unnecessary burden on the research to develop telescopes.

Which elements do hydrogen fuel cells combine to produce electricity?

• hydrogen and oxygen

• hydrogen and carbon

• hydrogen, oxygen, and nitrogen

• hydrogen, carbon, and nitrogen

The public is not yet able to purchase cars powered by hydrogen fuel cells because engineers have to determine how the cars perform based on which scenario?

• on racetracks

• in real-world conditions

• in flooded environments

• on closed courses

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Cars powered by hydrogen fuel cells emit which substance?

• oxygen

• carbon dioxide

• hydrogen

• water

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