Science Quiz Yolanda Armstrong

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

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

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

• organs

• muscles

• fluids

• bones

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

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

For which group of people might brain-powered cars allow the greatest increase in mobility?

• children or young adults

• people with physical disabilities

• highly educated people

• wealthy business people

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

• a robot

• a car

• a telescope

• a model