Science — Quiz Night questions

1What process do plants use to make food?

• Transpiration
• Digestion
• Photosynthesis
• Respiration

2What is the largest animal on Earth?

• Great white shark
• Elephant
• Blue whale
• Giraffe

3What is the fastest land animal?

• Lion
• Antelope
• Cheetah
• Horse

4Which creature makes honey?

• Dragonfly
• Ant
• Butterfly
• Bee

5Which of these is a mammal?

• Dolphin
• Crocodile
• Shark
• Octopus

6About how far does light travel in a second in a vacuum?

• 300,000 km
• 300 km
• 3 million km
• 30,000 km

7In which medium does sound not travel?

• In a vacuum
• In water
• In metal
• In air

8At sea level, at what temperature does water boil?

• 100 °C
• 80 °C
• 90 °C
• 120 °C

9What is the sound heard after lightning called?

• Thunder
• Ringing
• A rumble
• An echo

10Why does ice float on water?

• Because it contains salt
• Because it's colder
• Because it's less dense than water
• Because it's airtight

11What is the chemical formula for water?

• NaCl
• H2O
• CO2
• O2

12Which element does "O" stand for on the periodic table?

• Oxygen
• Gold
• Nitrogen
• Osmium

13Which element is diamond made of?

• Calcium
• Iron
• Carbon
• Silicon

14What is the largest planet in the solar system?

• Saturn
• Jupiter
• Earth
• Neptune

15Which planet is known as the Red Planet?

• Mars
• Mercury
• Venus
• Jupiter

16Which celestial body's light reaches Earth in the shortest time?

• Sirius
• Proxima Centauri
• The North Star
• The Sun

17Which planet has the most visible rings?

• Jupiter
• Neptune
• Uranus
• Saturn

18How many days does Earth take to orbit the Sun?

• 365
• 24
• 100
• 30

19What is the Moon's best-known effect on Earth?

• The seasons
• The winds
• Earthquakes
• The tides

20How many bones does an adult human have?

• 250
• 180
• 206
• 300

21Which gas do we breathe out?

• Carbon dioxide
• Oxygen
• Nitrogen
• Helium

22How many chambers does the human heart have?

• 2
• 4
• 3
• 6

23What is the largest organ in the human body?

• The liver
• The lungs
• The skin
• The intestine

24Which vitamin do we make from sunlight?

• Vitamin K
• Vitamin A
• Vitamin C
• Vitamin D

25Which organ pumps blood around the body?

• The kidney
• The heart
• The liver
• The lungs

26Which planet is closest to the Sun?

• Mars
• Mercury
• Venus
• Earth

27Which planet appears brightest in the night sky?

• Mercury
• Jupiter
• Mars
• Venus

28Which planet spins on a sideways axis?

• Uranus
• Neptune
• Jupiter
• Saturn

29What is the Sun, scientifically speaking?

• Comet
• Satellite
• Planet
• Star

30Other than the Sun, which star appears brightest in the night sky?

• The North Star
• Betelgeuse
• Vega
• Sirius

31What is the main gas that stars are made of?

• Nitrogen
• Hydrogen
• Helium
• Oxygen

32What is the name of Earth's natural satellite?

• The Moon
• Europa
• Phobos
• Titan

33About how many days does the Moon take to orbit Earth?

• 1
• 28
• 365
• 100

34Which planet in the solar system is farthest from the Sun?

• Uranus
• Neptune
• Jupiter
• Saturn

35How many natural moons does Mars have?

• 0
• 4
• 1
• 2

36What is the name of Saturn's largest moon?

• The Moon
• Europa
• Titan
• Ganymede

37Which is the largest moon in the solar system?

• The Moon
• Titan
• Ganymede
• Europa

38What do we call a space object with gravity so strong that not even light can escape it?

• Quasar
• Supernova
• Neutron star
• Black hole

39What do we call a space object that grows a bright tail as its ice evaporates near the Sun?

• Asteroid
• Comet
• Planet
• Meteor

40What is the name of the famous comet visible from Earth roughly every 76 years?

• Sputnik
• Voyager 1
• Halley's Comet
• Apollo 11

41What is the name of the famous telescope that takes pictures of space from Earth's orbit?

• Hubble Space Telescope
• Apollo 11
• Sputnik
• Voyager 1

42What is the name of the galaxy we live in?

• The Solar System
• Andromeda
• The Milky Way
• The Big Bang

43What is the nearest large galaxy to the Milky Way?

• The Milky Way
• The Big Bang
• Andromeda
• The Solar System

44What is it called when the Moon passes between the Sun and Earth?

• Lunar eclipse
• Tide
• Meteor shower
• Solar eclipse

45In which organ is the human body's smallest bone found?

• The ear
• The nose
• Hand
• The eye

46Which blood cell gives blood its red color?

• White blood cell
• Red blood cell
• Plasma
• Platelet

47Which blood cell defends the body against germs and disease?

• White blood cell
• Platelet
• Red blood cell
• Plasma

48How many main blood types are there?

• 4
• 3
• 2
• 8

49In which organ is most digested food absorbed?

• The liver
• Small intestine
• Large intestine
• The stomach

50In which organ does digestion begin?

• The mouth
• The esophagus
• The stomach
• Small intestine

51Which part of the brain controls balance and movement coordination?

• The brainstem
• The spinal cord
• The cerebellum
• The brain

52Which organ is the body's center for thinking and decision-making?

• The heart
• The kidney
• The brain
• The liver

53What is the hardest tissue in the human body?

• Bone
• Hair
• Tooth enamel
• Fingernail

54Which organ is responsible for the sense of taste?

• The nose
• The ear
• The skin
• The tongue

55Which organ is responsible for the sense of smell?

• The ear
• The tongue
• The eye
• The nose

56How many main types of muscle are there?

• 3
• 4
• 2
• 5

57What is the type of muscle attached to bones that produces body movement called?

• Smooth muscle
• Cardiac muscle
• Fat tissue
• Skeletal muscle

58What is the largest muscle in the human body?

• Back muscle
• Biceps muscle
• Calf muscle
• The gluteal muscle

59What is the liquid part of blood that carries the blood cells called?

• Serum
• Plasma
• Bile
• Lymph

60Which blood cell forms clots to stop bleeding?

• White blood cell
• Platelet
• Red blood cell
• Plasma

61Which organ filters blood to make urine?

• The spleen
• The stomach
• The kidney
• The liver

62What is the longest bone in the human body?

• Collarbone
• The thigh bone
• The spine
• Rib

63Which organ senses touch, temperature, and pain?

• The nose
• The skin
• The tongue
• The ear

64What is the freezing point of water?

• -10 °C
• 100 °C
• 0 °C
• 50 °C

65What is it called when a solid turns into a liquid on heating?

• Freezing
• Melting
• Evaporation
• Condensation

66What is it called when a liquid turns into a solid on cooling?

• Sublimation
• Melting
• Freezing
• Evaporation

67What is it called when a liquid turns into a gas on heating?

• Freezing
• Melting
• Condensation
• Evaporation

68What is it called when a gas turns into a liquid on cooling?

• Evaporation
• Condensation
• Melting
• Sublimation

69How many poles does a magnet have?

• 1
• 2
• 3
• 4

70Which metal is attracted by a magnet?

• Copper
• Aluminum
• Gold
• Iron

71Which of these materials conducts electricity best?

• Copper
• Wood
• Rubber
• Plastic

72Which unit is printed on batteries?

• Ampere
• Ohm
• Watt
• Volt

73Which unit is used to measure a light bulb's power?

• Watt
• Ohm
• Ampere
• Volt

74How many colors are there in a rainbow?

• 8
• 5
• 6
• 7

75What is the force that pulls objects toward the ground called?

• Buoyant force
• Magnetic force
• Friction
• Gravity

76What is the force that slows down a moving object called?

• Friction
• Buoyant force
• Magnetic force
• Gravity

77What is the force that makes objects feel lighter in water called?

• Gravity
• Friction
• Buoyant force
• Magnetic force

78Besides solid, liquid, and gas, what is known as the fourth state of matter?

• Smoke
• Crystal
• Vapor
• Plasma

79In which unit is the loudness of sound measured?

• Watt
• Kilogram
• Decibel
• Hertz

80What is the energy of a moving object called?

• Heat energy
• Potential energy
• Kinetic energy
• Electrical energy

81What is the stored energy of an object that is high up or stretched called?

• Potential energy
• Electrical energy
• Kinetic energy
• Heat energy

82What are materials that conduct electricity called?

• Magnet
• Conductor
• Alloy
• Insulator

83What are materials that do not conduct electricity called?

• Conductor
• Alloy
• Insulator
• Metal

84Which element does the symbol Fe represent?

• Iron
• Lead
• Copper
• Tin

85Which element does the symbol Au represent?

• Gold
• Copper
• Nickel
• Silver

86Which element does the symbol Ag represent?

• Tin
• Gold
• Iron
• Silver

87Which element does the symbol Na represent?

• Nitrogen
• Sodium
• Potassium
• Calcium

88Which element does the symbol K represent?

• Sodium
• Potassium
• Zinc
• Calcium

89Which element does the symbol Cu represent?

• Iron
• Copper
• Tin
• Zinc

90Which element does the symbol Pb represent?

• Iron
• Tin
• Zinc
• Lead

91Which element does the symbol H represent?

• Helium
• Nitrogen
• Hydrogen
• Oxygen

92Which element does the symbol Cl represent?

• Bromine
• Chlorine
• Iodine
• Fluorine

93Which element does the symbol Ca represent?

• Calcium
• Carbon
• Cobalt
• Chlorine

94Which element does the symbol Zn represent?

• Nickel
• Lead
• Tin
• Zinc

95What is the most abundant gas in the air?

• Carbon dioxide
• Nitrogen
• Hydrogen
• Oxygen

96What does an acidic substance generally taste like?

• Sweet
• Bitter
• Salty
• Sour

97Which type of substance turns litmus paper red?

• Base
• Acid
• Salt
• Metal

98What is the general chemical property of soap and detergent?

• Metal
• Neutral
• Acid
• Base

99What is the pH value of neutral water?

• 3
• 0
• 7
• 14

100Which is the only metal that is liquid at room temperature?

• Zinc
• Mercury
• Lead
• Tin

101What is it called when two or more substances come together without a chemical reaction?

• Mixture
• Compound
• Element
• Molecule

102What is the mixture formed when salt dissolves in water called?

• Element
• Acid
• Compound
• Solution

103Iron rusts as a result of reacting with which gas?

• Oxygen
• Hydrogen
• Carbon dioxide
• Nitrogen

104Which gas do plants take from the air for photosynthesis?

• Carbon dioxide
• Hydrogen
• Oxygen
• Nitrogen

105What is the smallest building block that carries the properties of an element called?

• Cell
• Ion
• Atom
• Molecule

106How many legs do spiders have?

• Eight
• Ten
• Four
• Six

107What is the process of a caterpillar turning into a butterfly called?

• Photosynthesis
• Incubation
• Metamorphosis
• Pollination

108What is the long winter sleep of some animals called?

• Migration
• Hibernation
• Incubation
• Metamorphosis

109What covers a bird's body?

• Hair
• Scales
• Feathers
• Spines

110What do bats use to find their way in the dark?

• Sound waves
• Heat
• Smell
• Light

111What do camels store in their humps?

• Sand
• Fat
• Water
• Air

112Where do polar bears live in the wild?

• The Amazon rainforest
• The Sahara
• The Arctic
• Antarctica

113Among peafowl, which one spreads the big colourful tail?

• The male
• All of them
• The female
• The chicks

114Where do sea turtles lay their eggs?

• On the beach
• On tree branches
• In coral reefs
• On the seabed

115Which part of a plant absorbs water and minerals from the soil?

• The leaf
• The root
• The fruit
• The flower

116Which gas do plants release into the air during photosynthesis?

• Oxygen
• Carbon dioxide
• Helium
• Nitrogen

117What is the carrying of pollen from one flower to another called?

• Germination
• Pollination
• Pruning
• Watering

118What do the rings in a tree trunk show?

• The soil moisture
• The tree species
• The wind direction
• The tree's age

119What are trees that keep their leaves all year called?

• Deciduous trees
• Evergreen trees
• Fruit trees
• Dwarf trees

120What are animals that eat only plants called?

• Omnivores
• Herbivores
• Carnivores
• Parasites

121What are the living things that break down dead plants and animals called?

• Producers
• Predators
• Herbivores
• Decomposers

122What is the cycle of water evaporating, forming clouds and falling as rain called?

• Erosion
• The carbon cycle
• The food chain
• The water cycle

123Which instrument measures wind speed?

• Thermometer
• Barometer
• Anemometer
• Compass

124What is a violent funnel-shaped spinning storm over land called?

• Avalanche
• Tornado
• Flood
• Landslide

125What does sunlight bent by raindrops create in the sky?

• Lightning
• Snow
• A rainbow
• Fog

126How many planets are in the solar system?

• 8
• 9
• 7
• 12

127What shape is the path planets follow around the Sun?

• Straight line
• Ellipse
• Triangle
• Square

128What is a star's huge explosion at the end of its life called?

• Nebula
• Meteor
• Supernova
• Galaxy

129Why does the surface of Mars look red?

• Because it is the closest planet to the Sun
• Because of rusted iron in its soil
• Because its sky is red
• Because its surface is always burning

130Which is the hottest planet in the solar system?

• Venus
• Jupiter
• Mars
• Mercury

131What is the belt of rocks between Mars and Jupiter called?

• The ring belt
• The solar belt
• The ice belt
• The asteroid belt

132What is Pluto classified as today?

• A dwarf planet
• A comet
• A star
• A moon

133What does a light year measure?

• Distance
• Temperature
• Weight
• Time

134What are the pits on the Moon's surface called?

• Caves
• Craters
• Valleys
• Canals

135What is it called when Earth's shadow falls on the Moon?

• A tide
• The northern lights
• A lunar eclipse
• A solar eclipse

136What are the dark patches on the Sun's surface called?

• Sun rings
• Sun pits
• Sun shadows
• Sunspots

137How many hours does Earth take to spin once on its axis?

• 12
• 24
• 48
• 365

138What is the main reason we have seasons?

• The Moon's position changes
• Earth's axis is tilted
• The Sun's brightness changes
• Earth's distance from the Sun changes

139What is a body that orbits a planet called?

• A nebula
• A star
• A moon
• A galaxy

140What are the shapes stars form in the sky called?

• Orbits
• Galaxies
• Comets
• Constellations

141What is the bright streak we call a shooting star actually?

• A small rock entering the atmosphere
• A star moving away
• Light reflected off the Moon
• A planet leaving its orbit

142What is the giant storm on Jupiter called?

• The Golden Storm
• The Black Vortex
• The Great Red Spot
• The Great Blue Ring

143What is the theory that the universe began with a huge explosion called?

• The Big Collapse
• The Cold Start
• The Eternal Universe
• The Big Bang

144What is the vehicle that lifts spacecraft into orbit called?

• A rocket
• A helicopter
• A balloon
• A submarine

145Which is the smallest planet in the solar system?

• Mars
• Mercury
• Earth
• Venus

146What is the protective suit astronauts wear in space called?

• A diving suit
• A raincoat
• A firefighter suit
• A spacesuit

147What is a telescope used for?

• Measuring temperature
• Finding directions
• Recording sounds
• Making distant objects in the sky look closer

148What causes day and night to follow each other?

• The Sun switching off each evening
• Earth spinning on its own axis
• The Moon covering the Sun
• Clouds covering the Sun

149Which of these is a gas giant?

• Mercury
• Venus
• Mars
• Neptune

150What is the changing look of the Moon in the sky called?

• The tides
• The phases of the Moon
• A lunar eclipse
• The Moon's orbit

151What is a newly hatched baby frog called?

• Larva
• Nymph
• Tadpole
• Pupa

152How many legs does an insect have?

• 6
• 4
• 10
• 8

153Which mammal is known for laying eggs?

• Platypus
• Seal
• Bat
• Squirrel

154Which bee lays the eggs in a hive?

• The worker bee
• The guard bee
• The queen bee
• The drone

155Which reptile is famous for changing the colour of its skin?

• Cobra
• Iguana
• Chameleon
• Crocodile

156What do snakes shed as they grow?

• Their eyes
• Their skin
• Their tail
• Their teeth

157Which organs do fish use to take oxygen from water?

• Scales
• Fins
• Lungs
• Gills

158Which group of animals can live both in water and on land?

• Reptiles
• Birds
• Mammals
• Amphibians

159Eagles, hawks and owls belong to which group of birds?

• Flightless birds
• Water birds
• Songbirds
• Birds of prey

160What are animals called that are active at night and rest by day?

• Nocturnal animals
• Herd animals
• Migratory animals
• Diurnal animals

161What is it called when birds travel to distant regions each year and return?

• Nest building
• Hibernation
• Migration
• Moulting

162What is it called when an animal blends into its surroundings to hide?

• Hibernation
• Camouflage
• Metamorphosis
• Migration

163Which is the largest bird in the world?

• Ostrich
• Eagle
• Albatross
• Penguin

164What must whales do in order to breathe?

• Breathe through the skin
• Come up to the surface
• Never breathe at all
• Use gills

165What makes up most of a jellyfish's body?

• Bone
• Water
• Muscle
• Fat

166What can a starfish do about a lost arm?

• It forms a shell
• It grows a new one
• It changes colour
• It lives without it

167What colour is the skin under a polar bear's fur?

• Black
• Grey
• Pink
• White

168An elephant's trunk is the extended form of which body parts?

• The nose and upper lip
• The upper jawbone
• The tongue
• The neck muscle

169In lion prides, who usually does the hunting?

• The cubs
• The females
• The oldest lions
• The males

170Which bird can hover in the air and fly backwards?

• Hummingbird
• Seagull
• Stork
• Sparrow

171Which is the largest fish in the world?

• Whale shark
• Tuna
• Swordfish
• Blue whale

172What does an octopus squirt into the water to escape danger?

• Ink
• Venom
• Foam
• Sand

173Snails and octopuses belong to which animal group?

• Insects
• Arthropods
• Worms
• Molluscs

174What do beavers build across streams?

• A tunnel
• A bridge
• A dam
• A tower

175What material is a spider's web made of?

• Wax
• Silk
• Cotton
• Resin

176What is the sweet liquid bees collect from flowers called?

• Nectar
• Wax
• Pollen
• Resin

177Which sea mammal of polar waters is known for its long tusks?

• Sea lion
• Dolphin
• Walrus
• Seal

178What are animals whose body temperature changes with their surroundings called?

• Warm-blooded animals
• Migratory animals
• Cold-blooded animals
• Mammals

179Mice, squirrels and beavers belong to which animal group?

• Rodents
• Insectivores
• Marsupials
• Carnivores

180Which of these animals is extinct?

• Bison
• Mammoth
• Elephant
• Panda

181Which part carries water from a plant's roots up to its leaves?

• The fruit
• The flower
• The stem
• The seed

182In flowering plants, which structure holds the seeds inside?

• The fruit
• The root
• The leaf
• The stem

183What does a seed absolutely need in order to sprout?

• Water
• Snow
• Salt
• Wind

184A cactus's spines are the modified form of which plant part?

• Its flowers
• Its fruit
• Its leaves
• Its roots

185Why can't fungi carry out photosynthesis?

• Because they have no chlorophyll
• Because they have no roots
• Because they produce no seeds
• Because they live in water

186What is it called when plants release water vapour from their leaves?

• Transpiration
• Pollination
• Respiration
• Germination

187Inside which structure are the seeds of pines and spruces found?

• A cone
• The fruit
• The flower
• The bark

188Which part of a flower produces pollen?

• The sepal
• The stamen
• The petal
• The pistil

189Which plant is known for the fluffy balls that let the wind carry its seeds?

• Rose
• Dandelion
• Sunflower
• Mint

190Which energy source do plants use for photosynthesis?

• Heat from the soil
• Wind
• Sunlight
• Rain

191Why do leaves turn yellow in autumn?

• The wind gets stronger
• The leaves end up in shade
• The chlorophyll fades away
• The soil freezes

192What is a flower's main job in a plant?

• To anchor the plant in the soil
• To make food
• To store water
• To carry out reproduction

193Which living things are at the first link of a food chain?

• Herbivores
• Carnivores
• Decomposers
• Plants

194What is the whole group of one species living in an area called?

• Habitat
• Ecosystem
• Population
• Food chain

195Which layer of the atmosphere filters out the Sun's harmful rays?

• The ozone layer
• The snow cover
• The cloud cover
• The forests

196Which phenomenon is caused by the rise of greenhouse gases?

• More earthquakes
• An ice age
• Global warming
• More ozone being produced

197What is it called when factory chimneys and vehicle exhausts foul the air?

• Soil pollution
• Noise pollution
• Air pollution
• Water pollution

198What is it called when used paper and bottles are processed and used again?

• Burning
• Recycling
• Landfilling
• Rotting

199What is the destruction of forests by cutting them down called?

• Pruning
• Deforestation
• Afforestation
• Irrigation

200What is it called when the topsoil is carried away by water and wind?

• Precipitation
• Pollination
• Erosion
• An avalanche

201Which of these is a renewable energy source?

• Oil
• Coal
• Wind
• Natural gas

202What is the main cause of coral reefs turning white?

• Moonlight
• The sea water warming up
• Strong winds
• The water losing its salt

203What are the tiny drifting organisms that whales and many sea creatures feed on called?

• Coral
• Plankton
• Sponge
• Seaweed

204What are clouds made of?

• Cotton
• Smoke
• Dust
• Tiny water droplets

205What is the amount of water vapour in the air called?

• Humidity
• Altitude
• Temperature
• Pressure

206What is the calm area at the centre of a tropical hurricane called?

• The floor of the storm
• The tail of the storm
• The shadow of the storm
• The eye of the storm

207How many arms does a snowflake famously have?

• 5
• 4
• 8
• 6

208What are the pieces of ice that fall from the sky called?

• Dew
• Frost
• Hail
• Snow

209What is the thick cloud layer that forms close to the ground called?

• A dust cloud
• Steam haze
• Fog
• Smoke

210What is lightning, really?

• A meteor entering the atmosphere
• A current of hot air
• A reflection of sunlight
• An electrical discharge in the clouds

211What is a monsoon?

• An ocean current
• A desert storm
• A seasonal wind
• A type of volcano

212What are the coloured lights seen in the sky near the poles called?

• A mirage
• The auroras
• A rainbow
• A meteor shower

213In the Northern Hemisphere, in which month does the longest day occur?

• March
• June
• December
• September

214What is the day when daytime and night are equal in length called?

• An eclipse
• The equinox
• The polar night
• The solstice

215Why does the air cool down so fast at night in deserts?

• Because the air is very dry
• Because the ground is damp
• Because the sand gives off heat
• Because the wind stops completely

216About what percentage of Earth's surface is covered by water?

• 30%
• 90%
• 50%
• 70%

217Where is most of the Earth's fresh water found?

• In rivers
• In glaciers and ice
• In clouds
• In lakes

218About how much of an iceberg stays above the water?

• About three quarters
• About a tenth
• About half
• Nearly all of it

219What are the stony remains of creatures that lived millions of years ago called?

• Minerals
• Crystals
• Fossils
• Ores

220Which instrument records earthquakes?

• Thermometer
• Telescope
• Seismograph
• Barometer

221What are the formations hanging down from a cave ceiling called?

• Stalagmites
• Icicles
• Rock salt
• Stalactites

222What is the land formed by sediment where a river meets the sea called?

• A delta
• A valley
• A canyon
• A peninsula

223How were coal and oil formed?

• From ancient life remains
• From volcanic lava
• From meteor dust
• From sea salt

224What are the giant slowly moving pieces that make up Earth's crust called?

• Continents
• Tectonic plates
• Layers
• Fault lines

225Why are passengers thrown forward when a bus brakes suddenly?

• Inertia
• Gravity
• Air resistance
• Friction

226What is the change of an object's speed over time called?

• Weight
• Mass
• Acceleration
• Inertia

227What is the unit of force?

• Ampere
• Watt
• Joule
• Newton

228Why does a fall slow down when a parachute opens?

• Because air resistance increases
• Because the person's mass decreases
• Because gravity decreases
• Because the wind changes direction

229Which basic principle pushes a rocket forward?

• Action and reaction
• Buoyancy
• Inertia
• Friction

230Scissors and tongs are examples of which simple machine?

• Screw
• Pulley
• Inclined plane
• Lever

231In a frictionless space, what happens to a moving object if no force acts on it?

• It keeps moving at the same speed
• It slows down and stops
• It keeps speeding up
• It turns back the way it came

232What does using a ramp to raise a heavy load give you?

• You need less force
• You travel a shorter distance
• You finish in less time
• The load becomes lighter

233How does a person's weight on the Moon compare with their weight on Earth?

• About one sixth as much
• Exactly the same
• About six times as much
• Exactly zero

234In a vacuum, which falls first: a feather or a hammer dropped at the same time and height?

• The hammer lands first
• The feather lands first
• They hit the ground at the same time
• Neither falls; they stay floating

235Why do astronauts float inside a space station?

• Because there is no gravity at all up there
• Because the station is not filled with air
• Because they are in constant free fall together with the station
• Because their suits lift them up

236Which scientist formulated the law of gravity?

• Nikola Tesla
• Michael Faraday
• Isaac Newton
• Galileo Galilei

237How does the attraction between two objects change as the distance between them grows?

• It does not change at all
• It gets weaker
• It gets stronger
• It first grows, then shrinks

238What happens when white light passes through a prism?

• It disappears completely
• It splits into its colours
• It turns black
• It comes out faster

239Why does a spoon in a glass of water look bent?

• Because light bends as it leaves the water
• Because the water really bends the spoon
• Because the glass magnifies the image
• Because water swallows all the light

240What lets us see our image in a mirror?

• Absorption of light
• Scattering of light
• Reflection of light
• Refraction of light

241Why does the sky look blue during the day?

• Because blue light scatters the most in the air
• Because the oxygen in the air is blue
• Because the Sun gives off blue light
• Because the seas colour the sky blue

242Why does a leaf look green to our eyes?

• Because it reflects every colour equally
• Because it gives off green light of its own
• Because it absorbs green light and reflects the rest
• Because it reflects green light and absorbs the rest

243What are materials that let no light through called?

• Opaque materials
• Shiny materials
• Transparent materials
• Translucent materials

244How is an object's shadow formed?

• When the object is cold
• When the object is moving
• When the object soaks up light and gives off darkness
• When the object blocks the path of light

245Which optical element is used in eyeglass lenses?

• A flat mirror
• A filter
• A prism
• A lens

246How does light travel when nothing blocks its way?

• In zigzags
• Along a wavy path
• In circles
• In a straight line

247What must be in the air for a rainbow to form?

• Tiny water droplets
• Grains of sand
• Thick smoke
• Blocks of ice

248In which kind of medium does sound travel fastest?

• In solids
• At the same speed in every medium
• In liquids
• In gases

249Which property decides whether a sound is high or low pitched?

• Its duration
• Its speed of travel
• Its frequency
• Its loudness

250What is it called when sound bounces off a surface and comes back?

• An echo
• Vibration
• Resonance
• Noise

251How do bats find their way in the dark?

• By following smells
• By the echo of the sounds they make
• By seeing heat with their eyes
• By feeling the ground shake

252What are sounds too high in frequency for the human ear called?

• Infrasound
• Echo sound
• Ultrasound
• Loud noise

253Why does an approaching ambulance siren sound higher pitched?

• Because of the Doppler effect
• Because the siren really gets louder
• Because our ears get tired
• Because the air warms up

254What happens to the sound when a guitar string is tightened more?

• It goes completely silent
• It gets lower
• It gets higher
• It does not change at all

255How is sound produced?

• By objects giving off light
• By objects changing colour
• By objects vibrating
• By objects heating up

256Why do we see lightning before we hear thunder?

• Because light travels much faster than sound
• Because the clouds hold the sound back for a while
• Because our eyes work faster than our ears
• Because the sound is created later than the flash

257How does the handle of a metal spoon in hot soup get warm?

• By radiation
• By conduction
• By convection
• By evaporation

258How does a radiator warm up a whole room?

• By convection
• By conduction
• By condensation
• By radiation

259How does the Sun's heat cross empty space to reach us?

• By radiation
• By convection
• By conduction
• By the winds

260What happens to the length of a metal rod when it is heated?

• It gets a little shorter
• It gets a little longer
• It does not change at all
• It first shortens, then lengthens

261Why do light-coloured clothes keep you cooler in summer heat?

• Because they absorb all the sunlight
• Because they stop sweating completely
• Because they reflect most of the sunlight
• Because their fabric is always thinner

262How does a thermos keep a drink hot for a long time?

• By constantly heating the liquid inside
• By blocking heat exchange between inside and outside
• By blowing hot air inside
• By never closing its lid

263If you turn up the flame under boiling water, what happens to the water's temperature?

• It keeps climbing quickly
• It suddenly drops
• It stays the same
• It first drops, then rises

264Why does wet skin feel colder in the wind?

• Because water reflects heat back
• Because the wind itself is truly very cold
• Because the evaporating water draws heat from the body
• Because water thickens the skin

265Which temperature scale is the most widely used in everyday life worldwide?

• Kelvin
• Fahrenheit
• Celsius
• Réaumur

266Which unit measures the strength of an electric current?

• Ampere
• Ohm
• Volt
• Watt

267What is the quantity that makes it harder for current to flow in a circuit called?

• Power
• Resistance
• Voltage
• Capacitance

268When a bulb is lit, electrical energy turns into which two forms of energy?

• Into sound and motion
• Into light and heat
• Into chemical and nuclear energy
• Into light energy only

269Why does hair rubbed on a sweater stand up?

• Because they get damp
• Because they pick up static electricity
• Because they get warm
• Because they become magnetic

270What is lightning actually?

• A burning cloud of gas
• A giant electrical discharge
• A very powerful sound wave
• A kind of strong wind

271Which kind of electric current comes out of household sockets?

• Direct current
• Static charge
• Alternating current
• Magnetic current

272What is the job of a fuse in an electrical circuit?

• To keep increasing the current
• To turn electricity into heat
• To store electricity
• To cut the circuit when the current gets too high

273How does a lightning rod protect a building?

• By pushing the lightning back into the sky
• By pushing the clouds away from the building
• By carrying the lightning safely into the ground
• By dampening the sound of the lightning

274What is the device that turns electrical energy into motion called?

• A transformer
• A battery cell
• An electric motor
• A generator

275What happens if you bring the same poles of two magnets together?

• They lose their magnetism completely
• They push each other away
• Nothing happens at all
• They pull each other together

276Which direction does a compass needle always point to?

• East
• West
• North
• South

277What happens if a bar magnet is cut right in half?

• Both pieces lose their magnetism
• Each piece becomes a magnet with two poles again
• The pieces turn into single-pole magnets
• One piece keeps the north pole, the other the south

278What happens to a magnet's pull if it is heated to a very high temperature?

• Its poles swap places
• It is not affected at all
• It gets weaker
• It becomes much stronger

279What forms around a wire carrying an electric current?

• A vacuum zone
• A magnetic field
• A heat shield
• A sound wave

280What device is on the crane that lifts cars in a scrapyard?

• A compressed air tank
• An electromagnet
• A heat generator
• A vacuum pump

281Why are snowshoes made wide?

• To warm the feet up faster
• To lower the pressure on the snow
• To make the person weigh less
• To raise the pressure on the snow

282What does a very thin blade edge increase?

• Its own mass
• The friction force
• The force it applies
• The pressure it applies

283How does air pressure change as you go higher up?

• It goes up
• It first rises, then falls
• It goes down
• It does not change at all

284How does water pressure change as you go deeper in the sea?

• It does not change at all
• It goes down
• It first falls, then rises
• It goes up

285Why do your ears block when a plane climbs?

• Because the outside air pressure changes quickly
• Because the plane's noise deafens the ear
• Because the cabin runs out of air completely
• Because gravity pushes on the eardrum

286Why does food cook faster in a pressure cooker?

• Because all the air inside is pumped out
• Because higher pressure makes water boil at a lower temperature
• Because the metal pot itself cooks the food
• Because higher pressure makes water boil at a higher temperature

287What really lets us draw a drink up through a straw?

• The air pressure pushing on the drink
• The pulling force of the tongue
• The drink's own temperature
• The gravity inside the straw

288Which instrument measures air pressure?

• A hygrometer
• A seismograph
• A thermometer
• A barometer

289What is the unit of energy?

• Pascal
• Volt
• Joule
• Newton

290Which of the following is true about energy?

• It exists in only one single form
• It is never destroyed, only changes form
• It is completely destroyed as it is used
• It can be created out of nothing

291Which conversion does a solar panel carry out?

• It turns sound into motion
• It turns light energy into electricity
• It turns electricity into light
• It turns heat into sound

292Which energy does a wind turbine turn into electricity?

• The motion energy of the wind
• The chemical energy of water
• The energy of sunlight
• The heat energy underground

293When you ride a bike, which energy in your body turns into motion?

• The electrical energy of blood
• The light energy of skin
• The nuclear energy in bones
• The chemical energy in food

294What does motion energy lost to friction mostly turn into?

• Into light
• Into chemical energy
• Into magnetic energy
• Into heat

295Which of these is a shared property of gases?

• They have a fixed shape of their own
• They fill the whole container they are in
• They do not spread inside any container
• They are completely impossible to compress

296Which of these is a shared property of liquids?

• Their volume keeps changing with the container
• They take the shape of their container
• They have a fixed shape of their own
• They never flow under any conditions

297How do a substance's particles move as a gas compared with as a solid?

• They move only downwards
• Much slower and far more cramped
• Much faster and far more freely
• They stay completely still

298Where do the water drops on the outside of a cold glass come from?

• From water leaking through the glass
• From the water vapour in the air
• From the glass itself melting
• From the sweat of our hand

299Which property stays the same when a substance changes state?

• Its shape
• Its volume
• Its density
• Its mass

300Which element does "N" stand for on the periodic table?

• Sodium
• Nickel
• Neon
• Nitrogen

301Which gas is lighter than air and makes balloons rise?

• Oxygen
• Carbon dioxide
• Nitrogen
• Helium

302Which is the lightest element on the periodic table?

• Helium
• Hydrogen
• Carbon
• Lithium

303Which light metal is used in drink cans and aircraft bodies?

• Silver
• Aluminium
• Lead
• Iron

304Which element is added to toothpaste to prevent tooth decay?

• Chlorine
• Sulfur
• Fluorine
• Iodine

305Which element is the main ingredient of sand and glass?

• Aluminium
• Calcium
• Silicon
• Carbon

306Which element makes stainless steel resistant to rust?

• Chromium
• Zinc
• Tin
• Copper

307What is the grey-black material in a pencil tip called?

• Clay
• Plaster
• Graphite
• Lime

308What is the structure at the centre of an atom called?

• Molecule
• Electron shell
• Compound
• Nucleus

309Which positively charged particle sits in the atomic nucleus?

• Molecule
• Electron
• Proton
• Neutron

310Which negatively charged particle moves around the nucleus?

• Proton
• Neutron
• Electron
• Ion

311Which particle in the atomic nucleus has no charge?

• Ion
• Neutron
• Proton
• Electron

312What does the atomic number of an atom tell us?

• The number of electron shells
• The mass number
• The number of protons
• The number of neutrons

313What is the structure formed when several atoms join together called?

• Element
• Mixture
• Molecule
• Nucleus

314Table salt is a compound of which two elements?

• Magnesium and sulfur
• Sodium and chlorine
• Calcium and chlorine
• Potassium and iodine

315How many hydrogen atoms are in one water molecule?

• 3
• 4
• 2
• 1

316What is it called when a solid turns straight into gas without melting?

• Sublimation
• Melting
• Condensation
• Freezing

317Dry ice is the solid form of which substance?

• Oxygen
• Water
• Carbon dioxide
• Nitrogen

318In which state of matter are the particles most orderly?

• Plasma
• Solid
• Gas
• Liquid

319How do a substance's melting point and freezing point compare?

• The freezing point is always higher
• There is no relation between them
• They are the same temperature
• The melting point is always higher

320Does water evaporate only when it boils?

• It evaporates only above fifty degrees
• No, it can evaporate at any temperature
• It evaporates only in sunlight
• Yes, only while boiling

321Burning paper is which kind of change?

• Change of state
• Physical change
• Dissolving
• Chemical change

322Sugar dissolving in water is which kind of change?

• Physical change
• Burning
• Chemical change
• Rusting

323What happens to water's boiling temperature when salt is added?

• It falls first, then rises
• It falls
• It rises
• It stays the same

324Substances with a pH below 7 belong to which group?

• Neutral substance
• Acid
• Salt
• Base

325Substances with a pH above 7 belong to which group?

• Salt
• Acid
• Neutral substance
• Base

326Which type of substance turns litmus paper blue?

• Acid
• Salt
• Base
• Pure water

327Which acid gives vinegar its sour taste?

• Citric acid
• Acetic acid
• Carbonic acid
• Lactic acid

328Which acid is found in stomach juice?

• Hydrochloric acid
• Acetic acid
• Lactic acid
• Citric acid

329Which acid gives yoghurt its tangy taste?

• Lactic acid
• Citric acid
• Acetic acid
• Sulfuric acid

330Medicines taken for heartburn have which property?

• Base
• Neutral substance
• Acid
• Salt

331Sugar water is an example of which kind of mixture?

• Heterogeneous mixture
• Homogeneous mixture
• Element
• Compound

332What kind of mixture forms when sand is put into water?

• Homogeneous mixture
• Heterogeneous mixture
• Element
• Compound

333Which method best recovers the salt from salty water?

• Distillation
• Evaporating
• Filtering
• Using a magnet

334Which method is used to separate sand from water?

• Distillation
• Filtering
• Evaporating
• Using a magnet

335What is the liquid that dissolves a substance in a solution called?

• Precipitate
• Solvent
• Solute
• Compound

336Which gas must be present for burning to happen?

• Oxygen
• Helium
• Nitrogen
• Carbon dioxide

337Which gas is most often used in fire extinguishers?

• Carbon dioxide
• Oxygen
• Hydrogen
• Helium

338Which gas is pumped into crisp packets to keep them fresh?

• Hydrogen
• Oxygen
• Nitrogen
• Carbon dioxide

339Which gas makes bread dough rise?

• Nitrogen
• Oxygen
• Carbon dioxide
• Helium

340What do you see when vinegar and baking soda are mixed?

• The mixture turns blue
• Nothing changes at all
• It fizzes and releases gas
• The mixture turns solid at once

341What happens if a glass is placed over a burning candle?

• It goes out after a short while
• It starts burning more brightly
• The flame is not affected at all
• The flame spreads outside the glass

342Why is soap able to clean greasy dirt?

• Because it evaporates the grease
• Because it lets water carry the grease away
• Because it freezes the grease solid
• Because it turns the grease into acid

343Why is it dangerous to mix bleach with other cleaning products?

• Toxic gas can be released
• The cleaning power doubles
• The mixture can freeze quickly
• There is actually no danger at all

344Which element does "He" stand for on the periodic table?

• Hydrogen
• Iron
• Helium
• Carbon

345Which gas makes up about a fifth of the air?

• Nitrogen
• Helium
• Oxygen
• Carbon dioxide

346Which substance is spread on roads to stop ice forming in winter?

• Flour
• Sand
• Salt
• Sugar

347Which of these substances does not dissolve in water?

• Sugar
• Salt
• Baking soda
• Sand

348Which kitchen staple is used to absorb bad smells in a fridge?

• Sugar
• Baking soda
• Flour
• Sand

349Which noble gas is used in glowing coloured signs?

• Nitrogen
• Oxygen
• Helium
• Neon

350Which yellow element is used in gunpowder and match heads?

• Sulfur
• Phosphorus
• Carbon
• Chlorine

351Which element gives bones and teeth their hardness?

• Zinc
• Sodium
• Iron
• Calcium

352Which element is responsible for the red colour of blood?

• Iron
• Zinc
• Copper
• Calcium

353Which light metal is widely used in phone and laptop batteries?

• Gold
• Lead
• Silver
• Lithium

354What are the vertical columns of the periodic table called?

• Series
• Shell
• Group
• Period

355In the table of the chemical elements, what are the horizontal rows called?

• Period
• Shell
• Series
• Group

356What are atoms of one element with different neutron counts called?

• Compound
• Isotope
• Ion
• Molecule

357Which of these elements is a gas at room temperature?

• Oxygen
• Mercury
• Iron
• Copper

358Which of these is a property shared by metals?

• They are all liquid at room temperature
• They all dissolve easily in water
• None of them look shiny
• They conduct heat and electricity well

359What makes sugar dissolve faster in water?

• Adding the sugar in big lumps
• Cooling the water down
• Heating the water
• Covering the container and waiting

360A solution holding a lot of dissolved substance is called what?

• Concentrated solution
• Heterogeneous mixture
• Pure substance
• Dilute solution

361Which method turns seawater into drinkable water?

• Using a magnet
• Filtering
• Distillation
• Settling

362How many atoms are there in one carbon dioxide molecule?

• 3
• 5
• 2
• 4

363How many oxygen atoms are in one molecule of oxygen gas?

• 1
• 2
• 4
• 3

364Why do oil and water not mix?

• Because oil does not dissolve in water
• Because water instantly evaporates the oil
• Because oil is hotter than water
• Because oil is a strong acid

365Why does a cut apple turn brown so quickly?

• Because it reacts with oxygen in the air
• Because it instantly loses all its water
• Because light melts the apple
• Because its temperature drops sharply

366What is usually done to stop an iron gate from rusting?

• It is scrubbed with vinegar
• It is kept constantly wet
• It is covered with a coat of paint
• It is wiped with salty water

367Does pure water conduct electricity well?

• Yes, pure water is the best conductor known
• It conducts only when frozen
• No, pure water barely conducts it
• It conducts only when it is hot

368Why does an open fizzy drink lose its taste?

• Because the air boils the drink
• Because the sugar inside turns solid
• Because the carbon dioxide escapes
• Because the water inside freezes

369Why does cologne vanish from the skin so fast?

• Because it turns into water on the hand
• Because the skin absorbs all of it
• Because warmth turns it solid
• Because it is a liquid that evaporates easily

370What are the main substances released as a candle burns?

• Carbon dioxide and water vapour
• Only ash
• Hydrogen and helium
• Oxygen and nitrogen

371Why does salt keep food from spoiling for a long time?

• Because it freezes the food
• Because it changes the colour of the food
• Because it adds oxygen to the food
• Because it makes it hard for microbes to grow

372Do the elements forming a compound keep their own properties?

• Only gases keep their properties
• Only metals keep their properties
• Yes, they keep their properties completely
• No, a new substance with different properties forms

373What does toothpaste do to the acids in the mouth?

• It freezes the acids solid
• It turns the acids into sugar
• It makes the acids even stronger
• It helps neutralise the acids

374Which organ produces bile?

• Stomach
• Pancreas
• Spleen
• Liver

375In which organ is bile stored?

• Stomach
• Lung
• Gallbladder
• Kidney

376How many lungs does a human have?

• 4
• 3
• 1
• 2

377Which structure breaks food into small pieces in the mouth?

• Salivary glands
• Teeth
• Oesophagus
• Tonsils

378What is the largest internal organ in the human body?

• Liver
• Lung
• Heart
• Brain

379In which organ does urine collect before leaving the body?

• Liver
• Bladder
• Spleen
• Stomach

380Which organ carries swallowed food from the mouth to the stomach?

• Oesophagus
• Small intestine
• Windpipe
• Larynx

381Which muscle separates the chest from the abdomen and helps breathing?

• Abdominal muscle
• Diaphragm
• Heart muscle
• Biceps

382Which organ produces insulin, the hormone that controls blood sugar?

• Spleen
• Liver
• Kidney
• Pancreas

383Which butterfly-shaped gland sits at the front of the neck?

• Pituitary gland
• Sweat gland
• Tear gland
• Thyroid gland

384Which gland below the brain releases growth hormone?

• Pancreas
• Pituitary gland
• Liver
• Thyroid gland

385In which organ do undigested wastes turn into stool?

• Small intestine
• Oesophagus
• Large intestine
• Stomach

386Which body system carries oxygen to the cells?

• Circulatory system
• Skeletal system
• Digestive system
• Excretory system

387Which organ breaks down old blood cells and helps the immune system?

• Spleen
• Bladder
• Stomach
• Lung

388What is the coloured part of the eye called?

• Iris
• Pupil
• Retina
• Cornea

389How does the pupil react when the light gets dimmer?

• Its colour changes
• It does not change
• It gets bigger
• It gets smaller

390Which layer at the back of the eye senses light?

• Eyelid
• Cornea
• Retina
• Iris

391Which thin membrane in the ear vibrates with sound?

• Vocal cords
• Eye lens
• Outer ear
• Eardrum

392What are the small structures on the tongue that let us taste called?

• Salivary glands
• Vocal cords
• Taste buds
• Tonsils

393Which gland makes the fluid that keeps the eye moist?

• Sweat gland
• Tear gland
• Salivary gland
• Thyroid gland

394How many tiny bones are there in the middle ear?

• 3
• 7
• 1
• 5

395Why do foods taste weaker when the nose is blocked?

• Because the tongue dries out
• Because the sense of smell is blocked
• Because saliva decreases
• Because we chew more slowly

396What is each of the bones that make up the spine called?

• Rib
• Vertebra
• Joint
• Cartilage

397Which organs do the ribs protect?

• The stomach and liver
• The brain and spinal cord
• The kidneys and bladder
• The heart and lungs

398Which bony structure protects the brain?

• Pelvis
• Skull
• Spine
• Rib cage

399Which soft tissue inside bones produces blood cells?

• Muscle tissue
• Bone marrow
• Cartilage
• Fat tissue

400What is the tough structure that attaches muscles to bones called?

• Nerve
• Tendon
• Cartilage
• Blood vessel

401What is the place where two bones meet called?

• Vertebra
• Bone marrow
• Joint
• Tendon

402Which muscle bulges at the front of the arm when we bend it?

• Biceps
• Abdominal muscle
• Diaphragm
• Shoulder muscle

403Which thick tendon connects the heel to the calf muscles?

• Shoulder muscle
• Wrist tendon
• Knee ligament
• Achilles tendon

404What are the vessels that carry blood away from the heart called?

• Artery
• Vein
• Capillary
• Nerve

405What are the vessels that bring blood back to the heart called?

• Artery
• Tendon
• Vein
• Capillary

406Which is the thinnest vessel, where blood and cells exchange materials?

• Lymph vessel
• Capillary
• Vein
• Artery

407Which protein in red blood cells binds oxygen?

• Collagen
• Keratin
• Haemoglobin
• Insulin

408Which mineral is part of haemoglobin?

• Sodium
• Calcium
• Iron
• Zinc

409About how many litres of blood does an adult body hold?

• 2
• 10
• 20
• 5

410What is the heartbeat felt in the blood vessels called?

• Body temperature
• Pulse
• Blood pressure
• Breathing rate

411About how many times a minute does a resting adult heart beat?

• 70
• 20
• 150
• 220

412Which vitamin does blood need in order to clot?

• Vitamin D
• Vitamin A
• Vitamin C
• Vitamin K

413What is the pressure in the vessels created by the heart's beating called?

• Blood sugar
• Body temperature
• Breathing rate
• Blood pressure

414The juice that breaks down food in the stomach is rich in which kind of substance?

• Base
• Sugar
• Fat
• Acid

415What are the substances in saliva that start digestion called?

• Enzymes
• Hormones
• Vitamins
• Minerals

416Which food group gives the body the fastest energy?

• Carbohydrates
• Fats
• Proteins
• Minerals

417Which food group does the body need to build and repair muscle?

• Vitamins
• Proteins
• Carbohydrates
• Fats

418How many teeth does an adult human have?

• 24
• 32
• 40
• 20

419How many baby teeth do children have?

• 16
• 28
• 32
• 20

420Which nutrient, plentiful in fruit and vegetables, helps the bowels work?

• Sugar
• Salt
• Fat
• Fibre

421Which vitamin helps us see in dim light?

• Vitamin D
• Vitamin C
• Vitamin A
• Vitamin K

422About what percentage of the human body is water?

• 30%
• 10%
• 60%
• 90%

423Which substance does our body need most every day?

• Sugar
• Water
• Salt
• Fat

424In which unit is the energy we get from food measured?

• Degree
• Litre
• Gram
• Calorie

425Which flap stops food from slipping into the windpipe when we swallow?

• Eardrum
• Vocal cords
• Eyelid
• Epiglottis

426Which tube carries air from the mouth and nose to the lungs?

• Blood vessel
• Windpipe
• Intestine
• Oesophagus

427What are the tiny sacs in the lungs where air meets blood called?

• Alveoli
• Sweat glands
• Tonsils
• Taste buds

428Which sound is caused by a sudden contraction of the diaphragm?

• Cough
• Yawn
• Hiccup
• Sneeze

429Why does breathing get harder high in the mountains?

• Because the lungs shrink
• Because there is less oxygen in the air
• Because the wind is very strong
• Because the air is very cold

430What is the main job of the hairs inside the nose?

• Warming the body
• Filtering the air
• Providing the sense of taste
• Making the voice louder

431Which two structures make up the centre of the nervous system?

• The stomach and liver
• The heart and lungs
• The brain and spinal cord
• The kidneys and bladder

432What is it called when your hand pulls back by itself from something hot?

• Habit
• Memory
• Reflex
• Balance

433Which structure controls reflex movements?

• Lung
• Stomach
• Spinal cord
• Heart

434What is the cell that carries information in the nervous system called?

• Neuron
• Skin cell
• Muscle cell
• Red blood cell

435How many hemispheres does the brain have?

• 3
• 4
• 2
• 1

436Which hormone is released in darkness and regulates sleep?

• Melatonin
• Insulin
• Haemoglobin
• Adrenaline

437About how many degrees Celsius is a healthy person's normal body temperature?

• 40
• 32
• 42
• 37

438Which fluid does the skin release when the body gets too hot?

• Sweat
• Urine
• Tears
• Saliva

439Why do we shiver when we feel cold?

• Because the skin thickens
• Because muscles contract to make heat
• Because the bones shrink
• Because blood flow stops completely

440About how many hours of sleep a day are recommended for a healthy adult?

• 3
• 8
• 16
• 12

441What is the smallest unit of structure and function in living things?

• Tissue
• Cell
• Atom
• Organ

442Which part is the control centre of the cell?

• Cytoplasm
• Tissue
• Nucleus
• Cell membrane

443How many chromosomes are in a human body cell?

• 46
• 23
• 12
• 64

444Which protein makes up hair and nails?

• Collagen
• Haemoglobin
• Insulin
• Keratin

445Which substance gives colour to skin and hair?

• Keratin
• Melatonin
• Collagen
• Melanin

446What is the most important feature of fingerprints?

• They are the same in one family
• They change as we age
• They are different for every person
• They exist only on the right hand

447Which is the longest nerve in the body?

• Olfactory nerve
• Auditory nerve
• Sciatic nerve
• Optic nerve

448What is the outermost layer of the skin called?

• Epidermis
• Dermis
• Fat tissue
• Muscle tissue

449About how long does sunlight take to reach Earth?

• 8 days
• 8 seconds
• 8 minutes
• 8 hours

450Why does the sky look black on the Moon?

• Because it is very far from the Sun
• Because it is always night there
• Because it has no atmosphere
• Because its surface is dark

451What are Saturn's rings mostly made of?

• A thick dust cloud
• Hot gases
• Molten metal
• Ice and rock pieces

452Why do stars appear to twinkle in the sky?

• Because of moving air in the atmosphere
• Because stars keep changing places
• Because Earth spins very fast
• Because stars keep switching on and off

453What is one trip of a planet around the Sun called?

• A season
• A year
• A month
• A day

454Why do Uranus and Neptune look bluish?

• Because they are made of ice
• Because their surfaces are covered in seas
• Because of methane gas in their atmospheres
• Because they are very far from the Sun

455What is a space rock that lands on Earth called?

• A moon
• A meteorite
• A comet
• A galaxy

456Why is Venus the hottest planet even though it is not closest to the Sun?

• It spins very fast
• Its thick atmosphere traps the heat
• The same side always faces the Sun
• Volcanoes erupt on it constantly

457What advantage do space telescopes have over ones on Earth?

• They have fewer parts
• The atmosphere does not blur the view
• They work both day and night
• They are much cheaper to build

458What is the path one body follows around another called?

• A tail
• An axis
• A ring
• An orbit

459Who first observed Jupiter's four largest moons?

• Isaac Newton
• Nikola Tesla
• Galileo Galilei
• Marie Curie

460Why does the Moon always keep the same side facing Earth?

• It does not spin on its axis at all
• One side of it is far heavier than the other
• It spins once on its axis in the same time it orbits Earth
• Earth's magnetic field holds it in place

461What is the phase called when the Moon is almost invisible in the sky?

• New moon
• Last quarter
• First quarter
• Full moon

462Where is the Moon in relation to the Sun during a full moon?

• On the far side of Earth, directly across from the Sun
• Completely inside Earth's shadow
• Right next to the Sun in the sky
• Directly between the Sun and Earth

463How does the Sun produce the enormous energy it radiates?

• From the pull of the planets around it
• From a giant electric current flowing inside it
• By burning fuel like coal on its surface
• By fusing hydrogen nuclei together in its core

464Which element is the most abundant in the Sun after hydrogen?

• Iron
• Helium
• Oxygen
• Carbon

465What will happen to the Sun when it runs out of fuel billions of years from now?

• It will turn straight into a black hole
• It will swell up into a red giant
• It will split in two and become two stars
• It will stay exactly as it is, unchanged

466What is the small, very hot core left behind when a Sun-like star dies called?

• Black hole
• Neutron star
• Red giant
• White dwarf

467What is the city-sized but unimaginably dense object left after a huge star explodes called?

• Neutron star
• White dwarf
• Nebula
• Red giant

468What shape of galaxy is the Milky Way?

• An irregular galaxy
• An elliptical galaxy
• A spiral galaxy
• A ring galaxy

469What is thought to sit at the very centre of the Milky Way?

• A single, very bright star
• A supermassive black hole
• Nothing at all, it is empty space
• A giant block of ice

470What does the fact that all distant galaxies are moving away from us show?

• That the universe is expanding
• That the universe is shrinking
• That Earth sits at the centre of the universe
• That galaxies are slowing down and stopping

471According to scientists, roughly how old is the universe?

• About 4.6 billion years
• About 100 billion years
• About 500 million years
• About 13.8 billion years

472In which direction does a comet's tail point?

• Always straight towards the Sun
• Always opposite to the way it is travelling
• Always away from the Sun
• Always towards Earth

473Why do meteor showers return on the same dates every year?

• The Sun hurls out rocks at the same time each year
• Earth passes through the same trail of dust every year
• The Moon comes very close to Earth on the same date each year
• The atmosphere thins out in the same month every year

474What is the region beyond Neptune full of small icy bodies called?

• The asteroid belt
• Orion's Belt
• The Kuiper Belt
• A spiral arm of the Milky Way

475Which body in the Solar System has the most active volcanoes?

• Titan
• The Moon
• Io
• Europa

476What sets Saturn's moon Titan apart from other moons in the Solar System?

• It has rings of its own
• It is bigger than Earth
• It gives off its own light
• It has a thick atmosphere

477Which planet has the tallest volcano in the Solar System?

• Earth
• Venus
• Jupiter
• Mars

478Which planet spins on its axis in the opposite direction to the others?

• Mercury
• Venus
• Neptune
• Mars

479Which planet completes one spin on its axis in the shortest time?

• Mars
• Jupiter
• Earth
• Mercury

480Which planet has the biggest temperature difference between day and night?

• Saturn
• Mars
• Venus
• Mercury

481Which planet is so light that it would float if placed in a big enough ocean?

• Jupiter
• Saturn
• Uranus
• Neptune

482What is the type of telescope that uses mirrors instead of lenses to gather light called?

• Satellite dish
• Radio telescope
• Reflecting telescope
• Refracting telescope

483What are the giant dishes used to collect invisible waves from objects in space called?

• Radio telescope
• Refracting telescope
• Reflecting telescope
• Satellite dish

484Which unit of length is based on the average distance between Earth and the Sun?

• The light year
• The parsec
• The nautical mile
• The astronomical unit

485After the Sun, which star system is closest to Earth?

• The North Star
• Vega
• Alpha Centauri
• Sirius

486What causes the polar auroras to appear?

• Lightning forming in high clouds
• Moonlight reflecting off the ice
• Charged particles arriving from the Sun
• Giant ice sheets at the poles glowing

487What is the bright halo of light seen around the Sun during a total solar eclipse called?

• The corona
• The solar wind
• Sunspot
• The shadow cone

488Why isn't there a solar eclipse at every new moon?

• Because Earth's atmosphere scatters the shadow
• Because the Moon's orbit is tilted compared with Earth's
• Because the Moon is far too distant from Earth each month
• Because the Sun moves to a different place in the sky each month

489What unseen thing in the universe is suggested by galaxies spinning faster than expected?

• Dark matter
• Star dust
• Hot clouds of gas
• Strong magnetic fields

490Counting outwards from the Sun, which number planet is Earth?

• Fourth
• Third
• Second
• Fifth

491Which planet lies between Saturn and Neptune?

• Uranus
• Mars
• Jupiter
• Pluto

492What is the range of distances around a star where water can stay liquid called?

• The habitable zone
• The asteroid belt
• The magnetic belt
• The Kuiper Belt

493What are planets that orbit other stars called?

• Dwarf planet
• Asteroid
• Exoplanet
• Gas giant

494What colour do the hottest stars appear?

• Red
• Orange
• Yellow
• Blue

495Where in the universe are new stars born?

• In the cores of planets
• Right inside black holes
• In the empty space between galaxies
• Inside giant clouds of gas and dust

496What awaits the Milky Way and the Andromeda galaxy in the distant future?

• They will collide and merge into one galaxy
• They will drift apart and vanish from view
• They will swap places with each other
• Each of them will split in two

497Roughly how far is the Moon from Earth?

• About 38 thousand kilometres
• About 384 thousand kilometres
• About 150 million kilometres
• About 3 million kilometres

498Roughly how old is the Solar System?

• About 13.8 billion years
• About 4.6 billion years
• About 100 thousand years
• About 500 million years

499How do honeybees tell their hivemates where a food source is after returning to the hive?

• By touching with its antennae
• By dancing
• By the sound it makes
• By leaving a scent trail

500Which substances make fireworks burn in different colours?

• Charcoal powder
• Metal salts
• Paint pigments
• Coloured glass powders