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80 free Hard Trivia for Kids trivia questions with answers — trivia quiz, new questions added Aug 2026.
72 free Hard Trivia for Kids questions with answers. This is the quiz for the kid who has already aced the easy ones. Every question here is genuinely hard, but every answer is something an 8 to 12 year old can know or work out: which planet is hottest (not the closest one), how many hearts an octopus has, the smallest bone in your body, the only mammals that lay eggs, the deepest spot in the ocean, and which continent counts as the biggest desert. It mixes space, animals, the human body, world geography, history, inventors and science, and it is written for classrooms, family game nights, car rides and quiz-loving kids who want to be stumped for once. Grown-ups will not find it easy either. Nothing violent, nothing grown-up, just tough. Every answer was checked against Wikipedia's articles on the topic, and each question carries the sentence that backs it up.
30 of 80 questions with answers and explanations. Play the quiz
Q 01Which planet is the hottest in the Solar System?
Venus
It is not the closest to the Sun, but its thick carbon-dioxide atmosphere traps heat until the surface reaches about 464 °C.
Q 02How many hearts does an octopus have?
Three
One main heart pumps blood round the body and two smaller ones pump it through the gills; the main one stops when the octopus swims, so it prefers to crawl.
Q 03What is the smallest bone in the human body?
The stapes, in the ear
It is shaped like a stirrup and passes sound vibrations into the inner ear.
Q 04Roughly how many bones does an adult human have?
206
Babies are born with about 270, but many fuse together as they grow.
Q 05Which is the largest desert in the world?
Antarctica
A desert is defined by how little rain or snow falls, not by heat, and Antarctica gets very little. The Sahara is only the largest hot desert.
Q 06What gas makes up most of the air we breathe?
Nitrogen
Dry air is about 78 percent nitrogen and only 21 percent oxygen.
Q 07What is the capital city of Australia?
Canberra
It was purpose-built as a compromise between rivals Sydney and Melbourne and is Australia's largest inland city.
Q 08What is the smallest country in the world?
Vatican City
It covers only 44 hectares inside Rome and has fewer than 1,000 residents.
Q 09Which country is the largest in the world by area?
Russia
It stretches across eleven time zones and borders fourteen countries.
Q 10Which country has the most people?
India
Its population passed 1.4 billion in 2023, overtaking China.
Q 11How many countries are there in Africa?
54
That is more than any other continent; Algeria is the biggest by area and Nigeria has the most people.
Q 12Which is the longest mountain range on land?
The Andes
It runs about 8,900 km down the western edge of South America.
Q 13What is the deepest known point in the ocean called?
The Challenger Deep
It sits at the bottom of the Mariana Trench in the western Pacific, deeper than Mount Everest is tall.
Q 14Which is the largest and deepest ocean?
Q 21What is the largest living land animal?
The African bush elephant
Bulls average over three metres at the shoulder and eat about 150 kg of plants a day.
Q 22Which is the only group of mammals that can truly fly?
Bats
The others only glide. There are at least 1,500 bat species, about a fifth of all mammals.
Q 23Which Australian mammal lays eggs?
The platypus
When the first preserved one reached Europe in 1799, scientists thought it was a hoax sewn together from several animals.
The Pacific
It stretches from the Arctic to the Southern Ocean and covers more area than all the land on Earth.
Q 15What is the longest river in the world?
The Nile
It flows north for about 7,088 km into the Mediterranean, though the Amazon carries far more water.
Q 16Which country contains most of the Amazon rainforest?
Brazil
About 60 percent is in Brazil; the forest spreads across nine countries in total.
Q 17How much of Earth's surface is covered by ocean?
About 71 percent
That is why Earth looks blue from space and is sometimes called an ocean world.
Q 18What is the fastest land animal?
The cheetah
It can hit around 100 km/h thanks to a bendy spine and long legs, but only for a short sprint.
Q 19Which bird is thought to be the fastest animal of all when it dives?
The peregrine falcon
Its hunting dive, called a stoop, can top 320 km/h.
Q 20What is the largest animal that has ever lived?
The blue whale
It can reach 30 metres and 200 tonnes and eats almost nothing but tiny krill.
Q 24What is the smallest bird in the world?
The bee hummingbird
It is about 6 cm long and weighs around 2 grams, lighter than a coin.
Q 25A group of lions is called what?
A pride
A pride is mostly related females and their cubs, with one or a few adult males.
Q 26How many legs does an insect have?
Six
Three pairs, plus a three-part body and a pair of antennae. Spiders, with eight legs, are not insects.
Q 27A shark's skeleton is made of what?
Cartilage
It is the same bendy stuff that is in your ears and nose, which makes sharks lighter and more flexible than bony fish.
Q 28Which is the tallest animal on land?
The giraffe
It is also the largest ruminant, and its closest living relative is the okapi.
Q 29Why does a sloth's fur often look green?
Algae grow in it
The algae camouflage the sloth from predators, and its hair even grows the 'wrong' way because it hangs upside down.
Q 30Honey bees tell each other where food is by doing what?
A special dance
The 'waggle dance' points other workers toward flowers; a 'round dance' means the food is very close.