Units of Measurement Quiz

What was the main reason for the failure of the Mars Climate Orbiter?

• A mechanical failure

• A communication error regarding units

• A software bug

• An incorrect launch trajectory

Which system of units is primarily used in the United States?

• English system

• Imperial system

• International System of Units

• Metric system

Why is the metric system considered easier to use than the English system?

• It is used worldwide

• It uses smaller numbers

• It is based on the number 10

• It has fewer units

What is the current definition of a meter based on?

• The distance from the equator to the North Pole

• The length of a metal rod

• The distance light travels in a vacuum in a specific fraction of a second

• The width of a human hair

How is mass different from weight?

• Mass changes with location, weight does not

• Mass is measured in pounds, weight in kilograms

• Mass is independent of gravity, weight is dependent

• Mass is dependent on gravity, weight is not

What is the modern definition of a second based on?

• The revolution of the Earth around the Sun

• The periods of radiation from a cesium atom

• The rotation of the Earth

• The ticking of a mechanical clock

What does the Kelvin measure?

• The average kinetic energy of molecules

• The mass of an object

• The length of an object

• The amount of substance

What is the triple point of water?

• The point where water is only in vapor form

• The point where water can exist as solid, liquid, and gas

• The freezing point of water

• The temperature at which water boils

What is Avogadro's number used to define?

• The number of molecules in a liter of water

• The number of grams in a kilogram

• The number of atoms in a mole

• The number of seconds in a day

Why is the mole a useful unit in chemistry?

• It is based on the metric system

• It is used to measure time

• It measures temperature accurately

• It simplifies calculations by using large numbers