100+ Science Riddles to Test Your Knowledge and Enjoy the Challenge" Page 4 of 7

Approximately 299,792 kilometers per second.

46.

Riddles

I can’t be destroyed, I can only change form. riddle

It is very hard to create me, but I can’t be destroyed, I can only change form. What am I? –

 Energy.

47.

Riddles

What is the name of the force that causes an object to move in a circular path?

Centripetal force.

48.

Riddles

What is the unit of measurement for frequency?

hertz

49.

Riddles

What is the name of the force that causes objects to float in liquids or gases?

Answer: Buoyancy.

50.

Riddles

What is the process by which rocks are broken down into smaller pieces by physical means?

Mechanical weathering.

51.

Riddles

When two light nuclei become one, I liberate quite a bit of nuclear energy. What am I?

Nuclear fusion

52.

Riddles

What is the process by which organisms convert food into energy?

cellular respiration

53.

Riddles

What is the chemical symbol for potassium?

54.

Riddles

What can you hold for no longer than a few seconds?

Your breath

55.

Riddles

What is the speed of light in a vacuum?

Approximately 299,792 kilometers per second.

56.

Riddles

 What is the SI unit of electric charge?

Coulomb.

57.

Riddles

What is the process by which plants make their own food?

 Photosynthesis.

58.

Riddles

What is the study of the structure of the body and its organs called?

Anatomy

59.

Riddles

What are the only two periodic elements to have the state of a liquid?

Mercury and Bromine

60.

Riddles

What is the unit of measurement for pressure?

Pascal (Pa).