Science Facts Recall
Instructions: Test your recall of important science facts!
- 1.
What is the chemical formula for water?
ACO2BO2CH2ODNaCl - 2.
What planet is known as the 'Red Planet'?
AMarsBJupiterCSaturnDVenus - 3.
What gas do plants absorb from the atmosphere during photosynthesis?
ACarbon dioxideBNitrogenCOxygenDHydrogen - 4.
How many planets are in our solar system?
A9B10C8D7 - 5.
What is the hardest natural substance on Earth?
ADiamondBTopazCRubyDQuartz - 6.
What is the largest organ in the human body?
ALungsBSkinCLiverDBrain - 7.
What is the speed of light in a vacuum (approximately)?
ABoth A and CB186,000 miles per hourC670 million miles per hourD186,000 miles per second - 8.
What element does the symbol 'Fe' represent on the periodic table?
AIronBFranciumCFermiumDFluorine - 9.
How long does it take for light from the Sun to reach Earth?
AAbout 8 secondsBAbout 8 minutesCAbout 80 minutesDAbout 8 hours - 10.
What force keeps planets in orbit around the Sun?
AMagnetic forceBNuclear forceCGravityDCentrifugal force - 11.
What is the most abundant gas in Earth's atmosphere?
ACarbon dioxideBNitrogenCHydrogenDOxygen - 12.
What is absolute zero in Fahrenheit?
A-273°FB-500°FC-360°FD-460°F - 13.
What particle in an atom has a negative charge?
AQuarkBNeutronCProtonDElectron - 14.
What is the process by which a solid turns directly into a gas called?
ACondensationBDepositionCEvaporationDSublimation - 15.
What scientist is credited with developing the theory of general relativity?
AMax PlanckBNiels BohrCAlbert EinsteinDIsaac Newton
Answer Key
Water's chemical formula is H2O, meaning each molecule contains two hydrogen atoms and one oxygen atom.
Mars is called the Red Planet because iron oxide (rust) on its surface gives it a distinctive reddish appearance.
Plants absorb carbon dioxide (CO2) and use sunlight to convert it into glucose and oxygen through photosynthesis.
There are 8 planets in our solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Pluto was reclassified as a dwarf planet in 2006.
Diamond is the hardest natural substance on Earth, rating 10 on the Mohs hardness scale. It is made of carbon atoms arranged in a crystal structure.
The skin is the largest organ, covering about 20 square feet in adults and weighing about 8 pounds. It serves as the body's first line of defense.
Light travels at approximately 186,000 miles per second, which equals about 670 million miles per hour. Both expressions describe the same speed.
Fe is the chemical symbol for iron, derived from its Latin name 'ferrum.' Iron is essential for making hemoglobin in red blood cells.
Light from the Sun takes approximately 8 minutes and 20 seconds to reach Earth, traveling about 93 million miles.
Gravity is the force that keeps planets in orbit around the Sun. It was famously described by Isaac Newton and later refined by Einstein's general relativity.
Nitrogen makes up about 78% of Earth's atmosphere. Oxygen is second at about 21%, with other gases making up the remaining 1%.
Absolute zero is -459.67°F (approximately -460°F), or -273.15°C, or 0 Kelvin. It is the lowest possible temperature where all molecular motion stops.
Electrons carry a negative charge and orbit the nucleus of an atom. Protons carry a positive charge, and neutrons have no charge.
Sublimation is the process where a solid changes directly into a gas without passing through the liquid phase. Dry ice (solid CO2) is a common example.
Albert Einstein published his theory of general relativity in 1915. It describes gravity as a curvature of spacetime caused by mass and energy.