Kinetic energy is measured in joules?
True False
True: Kinetic energy is measured in joules (J) One joule equals one kg·m²/s² in SI base units.
Electrons spin around the nucleus of an atom?
True False
True: Electrons orbit the nucleus in shells or orbitals They're held in place by the electromagnetic force between their negative charge and the nucleus's positive charge.
The two ends of a magnet are called the north and south poles?
True False
True: A magnet has a north pole and a south pole Like poles repel; opposite poles attract. You cannot have a magnet with only one pole.
Water is chemically H₂O — two hydrogen atoms and one oxygen?
True False
True: Water's formula is H₂O The two hydrogen atoms bond at a 104.5° angle to the oxygen atom, making water a polar molecule.
The Earth rotates on its axis once every 24 hours?
True False
True: One full Earth rotation takes about 24 hours More precisely, 23 hours 56 minutes relative to the stars (a sidereal day).
All bacteria are harmful to humans?
True False
False: Most bacteria are harmless; some are beneficial Gut bacteria aid digestion; others produce vitamins or yogurt/cheese.
The human body is about 60% water by mass?
True False
True: The average adult human body is roughly 60% water Infants are about 75%; fatty tissue contains less water than lean tissue.
The Moon is larger than Earth?
True False
False: The Moon is about one-quarter the diameter of Earth Moon diameter: 3,474 km; Earth: 12,742 km.
Gold is chemically inert — it doesn't rust or tarnish easily?
True False
True: Gold is highly unreactive This is why ancient gold artefacts remain bright and uncorroded.
Helium is lighter than air?
True False
True: Helium is much less dense than air This is why helium balloons rise.
DNA stands for Deoxyribonucleic Acid?
True False
True: DNA is an abbreviation for Deoxyribonucleic Acid DNA carries genetic information in all known living organisms.
Bats are blind?
True False
False: Most bats can see, though they rely heavily on echolocation The saying 'blind as a bat' is a myth; bats have functional eyes.
The pH scale runs from 0 to 14?
True False
True: The pH scale runs from 0 (most acidic) to 14 (most alkaline) pH 7 is neutral (pure water).
Saturn's rings are made mostly of ice?
True False
True: Saturn's rings are about 99% water ice The particles range from dust-sized to several metres across.
Humans have 206 bones at birth?
True False
False: Babies are born with around 270 bones Many bones fuse during growth; adults end up with 206.
The speed of light in a vacuum is about 300,000 km/s?
True False
True: Light travels at about 299,792 km/s in a vacuum Nothing with mass can travel faster than light; it's a universal speed limit.
Uranus rotates on its side?
True False
True: Uranus's axis is tilted about 98° — it essentially rolls around the Sun Likely the result of a massive collision early in the solar system's history.
The chemical element with the symbol W is tungsten?
True False
True: W stands for tungsten (from 'wolfram') Tungsten has the highest melting point of any metal at 3,422 °C.
Mitochondria are the storage units of cells?
True False
False: Mitochondria are the powerhouses of cells They convert nutrients into ATP, the cell's main energy currency.
Electrons are attracted to protons due to their opposite charges?
True False
True: Electrons (negative) are attracted to protons (positive) This electromagnetic attraction holds atoms together.
