50 Science quiz questions and answers
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Easy questions50
Which gas makes up most of Earth's atmosphere?
- Carbon dioxide
- Nitrogen
- Argon
- Oxygen
Answer: Nitrogen
What is the hardest natural substance on Earth?
- Garnet
- Titanium
- Diamond
- Corundum
Answer: Diamond
Which number describes proton count in an atom?
- Atomic number
- Molar mass
- Mass number
- Neutron number
Answer: Atomic number
What is the chemical symbol for gold?
- Au
- Gd
- Go
- Ag
Answer: Au
Which planet is known as the "Red Planet"?
- Mars
- Jupiter
- Mercury
- Venus
Answer: Mars
What does DNA stand for?
- Dinucleic acid
- Deoxyribose nitrate
- Dual nucleotide array
- Deoxyribonucleic acid
Answer: Deoxyribonucleic acid
Which star is closest to Earth?
- The Sun
- Alpha Centauri A
- Proxima Centauri
- Sirius
Answer: The Sun
How many planets does our Solar System have?
- 7
- 8
- 9
- 10
Answer: 8
Which organelle is known as the "powerhouse of the cell"?
- The mitochondrion
- The Golgi apparatus
- The nucleus
- The ribosome
Answer: The mitochondrion
What is the pH of pure water at 25 °C?
- 0
- 5
- 7
- 14
Answer: 7
Which blood cells fight infection?
- Haemoglobin
- Red blood cells
- White blood cells
- Platelets
Answer: White blood cells
Which gas do plants take in for photosynthesis?
- Oxygen
- Nitrogen
- Carbon dioxide
- Hydrogen
Answer: Carbon dioxide
What is the unit of electrical resistance?
- Ohm
- Watt
- Volt
- Ampere
Answer: Ohm
Which particle in an atom carries no electric charge?
- The electron
- The neutron
- The ion
- The proton
Answer: The neutron
Who formulated the three laws of motion?
- Newton
- Einstein
- Kepler
- Galileo
Answer: Newton
Which blood vessels carry blood away from the heart?
- The capillaries
- The lymph vessels
- The arteries
- The veins
Answer: The arteries
What is the transformation of a caterpillar into a butterfly called?
- Metamorphosis
- Mutation
- Mitosis
- Migration
Answer: Metamorphosis
Which element has the chemical symbol Fe?
- Fermium
- Francium
- Fluorine
- Iron
Answer: Iron
Who published the book "On the Origin of Species" in 1859?
- Alfred Russel Wallace
- Charles Darwin
- Gregor Mendel
- Jean-Baptiste Lamarck
Answer: Charles Darwin
What are animals called that eat both plants and meat?
- Herbivores
- Carnivores
- Omnivores
- Detritivores
Answer: Omnivores
Who put the Sun rather than the Earth at the centre of the universe in 1543?
- Nicolaus Copernicus
- Galileo Galilei
- Johannes Kepler
- Tycho Brahe
Answer: Nicolaus Copernicus
Which element is written as Na in chemistry?
- Nitrogen
- Sodium
- Neon
- Nickel
Answer: Sodium
What is a comet essentially made of?
- Glowing metal
- Burning gas
- Solid rock
- Ice and dust
Answer: Ice and dust
In which unit is electrical voltage measured?
- Volts
- Watts
- Joules
- Amperes
Answer: Volts
What mainly causes the tides?
- The wind over the sea
- The warming by the Sun
- The pull of the Moon
- The rotation of the Earth
Answer: The pull of the Moon
Which scale is used to state wind strength?
- Richter
- Mohs
- Scoville
- Beaufort
Answer: Beaufort
What causes most earthquakes?
- The movement of tectonic plates
- Volcanic eruptions
- Landslides on the sea floor
- Changes in air pressure
Answer: The movement of tectonic plates
What is the sum of the interior angles of a triangle?
- 90°
- 180°
- 270°
- 360°
Answer: 180°
Which number is a prime number?
- 21
- 27
- 29
- 33
Answer: 29
What is the ratio of a circle's circumference to its diameter called?
- Pi
- Euler's number
- The golden ratio
- The square root of 2
Answer: Pi
Which pigment makes leaves green and captures light for photosynthesis?
- Carotene
- Haemoglobin
- Melanin
- Chlorophyll
Answer: Chlorophyll
What moves between the Sun and the Earth during a solar eclipse?
- Mercury
- The Earth's shadow
- The Moon
- Venus
Answer: The Moon
What is the name of the galaxy that contains our Solar System?
- Milky Way
- Large Magellanic Cloud
- Triangulum
- Andromeda
Answer: Milky Way
What does a pH value well below 7 indicate?
- An alkali
- A salt
- A metal
- An acid
Answer: An acid
Which planet is famous for its prominent ring system?
- Saturn
- Uranus
- Neptune
- Jupiter
Answer: Saturn
Why would an explosion in space make no sound?
- The solar wind blows the sound waves away
- Sound needs a medium such as air to travel through
- Space is far too cold for sound waves
- The distances in space are far too great for sound to carry
Answer: Sound needs a medium such as air to travel through
Why does ice float on water?
- Ice is less dense than liquid water
- Ice is colder than the water beneath it
- Ice traps many small air bubbles
- Surface tension carries the ice like a skin
Answer: Ice is less dense than liquid water
Which mineral makes bones and teeth hard?
- Potassium
- Sodium
- Calcium
- Iron
Answer: Calcium
Which colour of visible light has the longest wavelength?
- Blue
- Green
- Yellow
- Red
Answer: Red
Which part of the eye widens in the dark to let in more light?
- The cornea
- The pupil
- The lens
- The retina
Answer: The pupil
Which muscle does most of the work when you breathe in?
- The biceps
- The abdominal muscle
- The diaphragm
- The heart muscle
Answer: The diaphragm
What is ordinary table salt made of, chemically?
- Calcium carbonate
- Magnesium sulphate
- Sodium chloride
- Potassium nitrate
Answer: Sodium chloride
Which force keeps the planets on their orbits around the Sun?
- Friction
- Centrifugal force
- Magnetism
- Gravity
Answer: Gravity
Which sense organ is also responsible for our sense of balance?
- The ear
- The eye
- The nose
- The tongue
Answer: The ear
What does haemoglobin do in red blood cells?
- It makes blood clot
- It regulates blood sugar
- It carries oxygen
- It fights germs
Answer: It carries oxygen
How many chambers does the human heart have?
- 2
- 3
- 4
- 6
Answer: 4
Who developed the theory of relativity?
- Max Planck
- Werner Heisenberg
- Albert Einstein
- Niels Bohr
Answer: Albert Einstein
Who discovered penicillin in 1928?
- Alexander Fleming
- Louis Pasteur
- Robert Koch
- Joseph Lister
Answer: Alexander Fleming
What is molten rock called once it has reached the Earth's surface?
- Basalt
- Pumice
- Lava
- Magma
Answer: Lava
Which organ filters waste out of the blood and turns it into urine?
- The spleen
- The bladder
- The kidney
- The liver
Answer: The kidney