What is the second most abundant element in the Earth's crust?
- Silicon
- Iron
- Aluminium
- Carbon
Which subatomic particle carries a negative electric charge?
- Electron
- Proton
- Neutron
- Photon
What is the pH of a neutral solution at 25 degrees Celsius?
- 7
- 0
- 14
- 1
Which gas makes up roughly 21% of Earth's atmosphere?
- Oxygen
- Nitrogen
- Carbon dioxide
- Argon
The process by which a liquid turns into a gas is called?
- Evaporation
- Condensation
- Sublimation
- Precipitation
Which planet has the hottest surface in the Solar System?
- Venus
- Mercury
- Mars
- Jupiter
What is the chemical symbol for potassium?
- K
- P
- Po
- Pt
How many chromosomes are found in a typical human body cell?
- 46
- 23
- 48
- 44
Which scientist formulated the three laws of motion and universal gravitation?
- Isaac Newton
- Albert Einstein
- Galileo Galilei
- Nikola Tesla
What kind of energy is stored in a stretched rubber band?
- Elastic potential energy
- Kinetic energy
- Thermal energy
- Nuclear energy
Which part of the human inner ear is mainly responsible for balance?
- Semicircular canals
- Cochlea
- Eardrum
- Ossicles
Which blood type is known as the universal red-cell donor?
- O negative
- AB positive
- A positive
- B negative
Sound travels faster through water than through air.
- True
- False
A light-year is a unit of time, not distance.
- True
- False
Bats are completely blind.
- True
- False