Biology
What is the basic unit of life?
Cell
What is the chemical symbol for water?
H₂O
What is the unit used to measure force?
Newton (N)
What do we call animals that eat both plants and animals?
Omnivores
What is the closest star to Earth?
The Sun
What system in the human body is responsible for transporting oxygen and nutrients throughout the body?
Circulatory system
What is the smallest unit of an element that still keeps its chemical properties?
Atom
A parachute slows a skydiver’s fall. What force causes this slowing?
Air resistance (drag)
What is the name of the force that slows down moving objects when they rub against another surface?
Friction
What dwarf planet, once considered the ninth planet and is located in the Kuiper Belt?
Pluto
What is the name of the organ that carries oxygen-rich blood away from the heart to the body?
Arteries
What part of the atom has a positive charge?
Proton
A soccer ball and a bowling ball are dropped from the same height at the same time in a vacuum. Which hits the ground first?
They hit at the same time.
Why does ice float on water even though it is solid?
Ice is less dense than liquid water.
What force keeps planets in orbit around stars?
Gravity
What structure in plant cells contains chlorophyll and is responsible for absorbing light energy to carry out photosynthesis?
Chloroplast
What law states that mass is neither created nor destroyed in a chemical reaction?
Law of Conservation of Mass
A moving bicycle suddenly stops. Where did its kinetic energy go?
It changes into heat and sound energy.
Why does a larger surface area help an object cool faster?
More area allows heat to escape more quickly.
What type of celestial object is formed when a massive star collapses and has gravity so strong that not even light can escape?
Black hole
What is the structure made of tightly coiled DNA that is found in the nucleus and becomes visible during cell division?
Chromosome
What type of change occurs when a substance forms a new substance with different properties, such as when iron rusts?
Chemical change
Why is it dangerous to suddenly stop a fast-moving vehicle?
Large momentum makes stopping difficult for the people in the vehicle.
Why does a basketball bounce lower after being used for a long time?
Air pressure inside decreases.
What space program successfully landed the first humans on the Moon in 1969?
The Apollo program