home
Menu
Create
Random
0
0
0
thumbnail

Science General Knowledge Quiz - Hard

Can you answer these relatively tough science general knowledge questions?
Quiz by
Time123
Rate:
Last updated: June 3, 2026
You have not attempted this quiz yet.
More quiz info >>
First submittedMay 14, 2026
Times taken28
Average score55.0%
Report this quizReport
Quiz and answer stats >>
Shared scores >>
4:00
Enter answer here
0
 / 20 guessed
The quiz is paused. You have remaining.
Scoring
You scored / = %
This beats or equals % of test takers also scored 100%
The average score is
Your high score is
Your fastest time is
Keep scrolling down for answers and more stats ...
Hint
Answer
Approximately what percentage of the Earth's atmosphere is made up of nitrogen?
78
What 9-level scale is used to measure the level of light pollution in an area?
Bortle
The Carrington Event of 1859 was the largest ___ ___ in recorded history.
Solar Storm
Nuclei with "___ numbers" (ex. 20 and 82) of nucleons are exceptionally stable.
Magic
What organelle in a plant cell is the primary site of photosynthesis?
Chloroplast
Thanks to efforts to curb the use of ___, the Ozone layer is now repairing itself.
Chlorofluorocarbons
How many valence electrons does an alkaline earth metal have?
2
What scale is used to measure the relative scratch resistance of minerals?
Mohs
What element are diamonds and graphite derived from?
Carbon
The world's most popular programming language is ___.
Python
What type of intermolecular force is used to hold water molecules together?
Hydrogen Bonding
Which Swedish biologist's classification system has ranks such as "Genus" and "Class"?
Linnaeus
How is 13 written in binary (hint: the first four numbers in binary are 0, 1, 10 and 11)?
1101
What is the process whereby the ocean is becoming more concentrated with H+ ions?
Ocean Acidification
The acceleration due to gravity on Earth is about ___ meters per second squared.
9.81
Whose principle of classical mechanics describes a system's motion using energy?
Lagrange
How many bits are in 3 bytes (hint: the conversion factor between a bit and a byte can be represented as 2^x where x is an integer)?
24
Einstein's famous equation E=MC^2 shows how a tiny amount of mass can create a massive amount of what?
Energy
The highest magnitude that's ever been recorded on this base 10 logarithmic scale is a 9.5 (courtesy of a Chilean earthquake).
Richter
How much force in Newtons is required to accelerate a 1,000 kg car at a rate of 3 meters per second squared?
3000
Save Your Stats
Your Next Quiz
World Capitals Quiz
Can you name the capitals cities of all 196 countries in the world?
World Map Without 20 Random Countries
20 random countries have been removed from the map of the world! Can you identify them in 3 minutes?
World Map with Random Merged Countries
Ten random pairs of countries have been merged on the world map. Can you find them?
White Flags - Sudden Death
Click only the countries that have white somewhere on their national flag. But don't click a wrong answer or you will instantly surrender!
1 Comments
Time123
+1
Level 58
May 26, 2026
May 26, 2026: I tried improving the wording of some questions and removed some others entirely because they didn't align particularly well with the quiz's theme.
Copyright H Brothers Inc, 2008–2026
Contact Us | Go To Top | View Mobile Site | Site Map