Understanding Units in Science

What material is the International Prototype Kilogram made of?

• Iron and Carbon

• Copper and Tin

• Platinum and Iridium

• Gold and Silver

How many base units are included in the International System of Units?

• Five

• Seven

• Twelve

• Ten

What unit is used to measure force?

• Watt

• Joule

• Hertz

• Newton

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Who said 'True greatness is when your name is spelled with a lowercase letter'?

• Michael Faraday

• Albert Einstein

• Isaac Newton

• Richard Hamming

What does the slowing down of Earth's rotation affect?

• The definition of a second

• Gravity

• The speed of light

• The length of a day

What was the consequence of using the wrong units in the Mars Climate Orbiter mission?

• It missed Mars entirely

• It orbited Mars successfully

• It crashed into Mars

• It returned to Earth

What is the speed of a car in lightyears per second if it's going 60 miles per hour?

• 9.3 * 10^-12

• 1.2 * 10^-5

• 5.8 * 10^-8

• 3.0 * 10^-9

What type of numbers are defined with infinite precision?

• Measured numbers

• Arbitrary numbers

• Exact numbers

• Derived numbers

How many significant figures does the number 2.4590 * 10^-4 have?

• Three

• Four

• Five

• Six

What is the primary reason for using scientific notation in science?

• To increase precision

• To make numbers easier to read

• To preserve significant figures

• To simplify calculations