Hs represents Hydrogen on the periodic table of elements?
True False
False: It represents hassium Hassium (Hs) is a synthetic element, number 108; hydrogen is H.
The chemical formula for sodium is Na?
True False
True: Na is the chemical symbol for sodium From Latin 'natrium'; sodium is a reactive alkali metal.
The Hammer, anvil and stirrup are nicknames for three bones in the human body?
True False
True: Hammer, anvil and stirrup are the three bones of the middle ear Also called malleus, incus and stapes — the smallest bones in the body.
The nucleus of an atom is made up of protons and neutrons?
True False
True: The nucleus of an atom contains protons and neutrons Electrons orbit the nucleus; the nucleus holds almost all the atom's mass.
The minimum number of atoms required to join together chemically in order to form a molecule is three?
True False
False: A molecule can form from just two atoms joined together Examples: O₂ (two oxygen atoms), H₂ (two hydrogen atoms), HCl (one hydrogen, one chlorine).
The three different types of rainfall are frontal, relief and convectional?
True False
True: Frontal, relief and convectional are the three main types of rainfall Frontal = warm air meets cold; relief = air rises over hills; convectional = hot air rises.
The process of photosynthesis occurs when green plants absorb sunlight and convert carbon dioxide into food?
True False
True: Photosynthesis converts carbon dioxide and sunlight into glucose and oxygen Green chlorophyll in leaves absorbs light energy to drive the reaction.
An object must be still for kinetic energy to occur?
True False
False: Kinetic energy is the energy of motion — the object must be moving Stationary objects have zero kinetic energy; their stored energy is potential energy.
Females have 22 pairs of autosomes plus a pair of X chromosomes?
True False
True: Females have 22 pairs of autosomes plus two X chromosomes Males have 22 pairs of autosomes plus one X and one Y — 46 chromosomes in total.
The narrow edged teeth at the front of the mouth are called molars?
True False
False: They are incisors Incisors are the flat-edged cutting teeth at the front; molars are broad grinding teeth at the back.
The symbol for palladium on the periodic table of elements is Pd?
True False
True: Palladium's symbol is Pd Element 46; a rare precious metal used in catalytic converters.
In the equation E=mc², 'm' stands for mass?
True False
True: Mass Einstein's E=mc² — energy equals mass times the speed of light squared.
Galileo Galilei greatly improved and developed the telescope?
True False
True: Galileo greatly improved the telescope in 1609 He didn't invent it — Hans Lippershey did — but Galileo's refinements revealed Jupiter's moons and sunspots.
Nautical miles is the unit of measurement used worldwide to measure distance travelled by sea and air?
True False
True: Nautical miles 1 nautical mile = 1,852 metres (exactly), based on one minute of Earth's circumference.
Albert Einstein discovered gravity?
True False
False: Isaac Newton — not Einstein — famously described gravity Einstein later refined our understanding with general relativity (1915).
Potential energy occurs from a moving object?
True False
False: Potential energy occurs from still objects Potential energy is stored energy due to position (e.g. a raised weight).
Iron cannot become a permanent magnet?
True False
False: Iron can become a permanent magnet Iron, nickel and cobalt are the three ferromagnetic elements at room temperature.
In the equation, KE = ½·m·v², the letters 'KE' stand for Kinetic Energy?
True False
True: Kinetic energy KE = ½·m·v² — the kinetic energy of a moving object.
Sulfuric acid is not soluble in water?
True False
False: Sulfuric acid is highly soluble in water Dissolving it is strongly exothermic — always add acid to water, never water to acid.
In an electric circuit, if two 5 amp resistors are wired in series, the overall resistance of the circuit is 10 amps. The overall resistance if the two 5 amp resistors are wired in parallel is 2.5amps?
True False
True: 2.5 amps Resistors in series add: 5Ω + 5Ω = 10Ω (not amps). The existing answer '2.5 amps' in the DB is incorrect — this is a partial stored answer and should be reviewed.
