NEWEST PRACTICE EXAM QUESTIONS AND
CORRECT ANSWERS WITH CORRECT DETAILED
RATIONALES
1. What is the chemical symbol for water?
A) Wa
B) H2O
C) W
D) H2
Correct Answer: B
Rationale: The chemical symbol for water is H2O, indicating two hydrogen atoms
bonded to one oxygen atom.
2. Who was the first President of the United States?
A) Thomas Jefferson
B) George Washington
C) Abraham Lincoln
D) John Adams
Correct Answer: B
Rationale: George Washington served as the first President of the United States
from 1789 to 1797.
,3. What is the largest ocean on Earth?
A) Atlantic Ocean
B) Indian Ocean
C) Arctic Ocean
D) Pacific Ocean
Correct Answer: D
Rationale: The Pacific Ocean is the largest and deepest of the world's oceanic
divisions.
4. What is the main gas found in the air we breathe?
A) Oxygen
B) Carbon Dioxide
C) Nitrogen
D) Hydrogen
Correct Answer: C
Rationale: Nitrogen makes up about 78% of the Earth's atmosphere, while oxygen
is about 21%.
5. Who wrote the play "Romeo and Juliet"?
A) Charles Dickens
B) Mark Twain
C) William Shakespeare
D) Jane Austen
,Correct Answer: C
Rationale: William Shakespeare is the renowned author of the tragedy "Romeo and
Juliet."
6. What is the speed of light approximately?
A) 300,000 km/s
B) 3,000 km/s
C) 30,000 km/s
D) 3,000,000 km/s
Correct Answer: A
Rationale: The speed of light in a vacuum is approximately 299,792 kilometers per
second.
7. What is the hardest natural substance on Earth?
A) Gold
B) Iron
C) Diamond
D) Quartz
Correct Answer: C
Rationale: Diamond is the hardest known natural material, scoring a 10 on the Mohs
scale.
8. What is the process by which plants make their food?
A) Respiration
B) Transpiration
, C) Photosynthesis
D) Fermentation
Correct Answer: C
Rationale: Photosynthesis is the process where plants use sunlight, water, and carbon
dioxide to create food (glucose).
9. What is the smallest prime number?
A) 0
B) 1
C) 2
D) 3
Correct Answer: C
Rationale: A prime number is a natural number greater than 1 that has no positive
divisors other than 1 and itself. 2 is the smallest and only even prime number.
10. What is the name of the longest river in the world?
A) Amazon River
B) Nile River
C) Mississippi River
D) Yangtze River
Correct Answer: B
Rationale: The Nile River is generally considered the longest river in the world,
stretching about 6,650 kilometers.
11. What is the chemical formula for salt (sodium chloride)?