Logic (Riddles)
Math
Chemistry
Physics and Astronomy
Bio
100

Fill in the blank:
A>B

B>C

C>D

D>E

E _ A

<

100

33

27

100

The melting point of water is _________. (exact unit required)

0oC or 32oF

100

The largest planet in the solar system is:

Jupiter

100

Name the three main parts of a plant system.

Leaves, Stem, Root

200

A scientist is growing bacteria that doubles every day. On the 200th day, his plate is full of bacteria. When was a quarter of his plate covered by bacteria?

Day 198

200

How many numbers are in {0,3,6,9,...,24,27}?

10

200

Baking soda and vinegar reactions produce this gas. What is it?

Carbon dioxide

200

When you apply the brakes, you will eventually stop. What kind of force causes this?

Friction

200

What is the laziest organ in the human body?

The brain (It just sits there, telling everything else in the body to work.)

300

A tells the truth

B lies

C tells the truth

D lies

E __________.

We don't know anything about E

300

A person flips a fair coin 5 times. What is the chance of it being all heads?

1/32

300

True or false: All atoms have neutrons.

False: Hydrogen does not always have neutrons.

300

An ohmmeter measures:

Resistance

300

Name all the organs in the digestive system, in order from top to bottom and the direction of travel. (Liver is not needed in this question.)

Mouth, Esophagus, Stomach, Small intestine, Large intestine

400

Fill in the blank: O T T F F S S E N _ (one answer only)

T

400

The sum of five consecutive integers is 15. What is the smallest integer?

1

400

Fill in the blank: H He Li Be B C N O _ (one answer only)

F

400
When you look at a plane mirror, the image is always upright. What type of image is this?

Virtual

400

How do plants move water upwards from its roots to its leaves

Osmosis

500

A person died of old age at the age of 20. How is this possible?

He is born on Feb 29

500

What is the chance of a nickel landing on heads? (much harder than you think)

5999/12000 because there is a 1/6000 chance of it landing on its side.

500

These elements will never react with anything. Which category do they belong in?

Noble Gases


500

Why does the Moon show the same side to us every time?

It is tidally locked with Earth

500

What is cell division after fertilization?

Meiosis