Science Riddles with Answers

We collected 40+ best scientific puzzles for kids and adults! Check how well you know physics and chemistry, biology and astronomy!

Physics Riddles with Answers

When the son of the water returns to the parent, it dies. What is it?

What is neither water nor land, and is always soaking wet?

I can be hot, I can be cold,
I can run and I can be still,
I can be hard and I can be soft.
What am I?

Born in the ocean and white as snow.
When I fall back to water I disappear without a trace.
What am I?

Your mom and dad each gave you 23 of these threadlike strands
and they helped to make you who you are today.

Many have heard it, but nobody has ever seen it.
It will not speak back until spoken to.
What is it?

Which is heavier, a pound of bricks or a pound of feathers?

I give you a group of three. One is sitting down, and will never get up.
The second eats as much as is given to him, yet is always hungry.
The third goes away and never returns.

You can't see me, but I can see you;
To be more specific, I see through.
What am I?

Give it food and it will live;
give it water and it will die.
What is it?

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Chemistry Riddles

What is black when you buy it, red when you use it and gray when you throw it away?

What element is a girl’s future best friend?

What did the scientist say when he found 2 atoms of helium?

What element is derived from a Norse god?

What can eat a lot of iron without getting sick?

Give me food, and I will live.
Give me water, and I will die.
What am I?

I can burn your mouth and sting your eye,
but i am consumed everyday what am i?

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Biology Riddles

Thirty white horses on a red hill, First they champ,
Then they stamp, Then they stand still.

What are ten things you can always count on?

What do dogs have that no other animal has?

Anyone can hold me, even without their hands, yet no one can do it for long.
What am I?

I am under your face and outside your mind.
What am I?

When liquid splashes me, none seeps through.
When I am moved a lot, liquid I spew.
When I am hit, color I change.
And color, I come in quite a range.
What I cover is very complex, and I am very easy to flex.
What am I?

This is your stomach's way of letting you know you've neglected it.

I am a ball that can be rolled, but never bounced or thrown.
What am I?

Doctor Harish and a bus driver Manish are both in love with the same woman named Priyanka.
The bus driver need to go for a long trip of 10 days.
Before he left he gave priyanka 10 apples. Why?

I am the outstretched fingers that seize and hold the wind wisdom flows from me in other hands upon me are sweet dreams dreamt, my merest touch brings laughter.

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Astronomy Riddles

I'm very hot and i'm the nearest star to earth what planet am I?

At night they come without being fetched,
And by day they are lost without being stolen.

At night they come without being fetched.
By day they are lost without being stolen.
What are they?

I'm sometimes full, but I never overflow. What Am I?

Which reindeer loves to go to outer space?

I am the beginning of the end, as well as the end of time and space.
I am essential to creation and I surround every place.
What am I?

If you put your eye to this, It can help you to see far, It helps you to see planets, The moon or even a star.

What planet has the shortest year?

What is the center of gravity?

I am a god, a planet and I can measure heat. What am I?

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