PA EFDA BOARD TEST EXAM QUESTIONS
AND CORRECT ANSWERS WITH
RATIONALES
Set 1: General Science (Questions 1-40)
1. What is the hardest known natural substance?
A) Gold
B) Iron
C) Diamond
D) Platinum
Correct Answer: C
Rationale: Diamond is an allotrope of carbon where each atom is bonded to
four others in a rigid tetrahedral structure, making it extremely hard.
2. Which planet is known as the "Morning Star" or "Evening Star"?
A) Mars
B) Venus
C) Mercury
D) Jupiter
Correct Answer: B
,Rationale: Venus appears bright in the sky just before sunrise or after
sunset due to its thick atmosphere reflecting sunlight, making it the
"Morning/Evening Star."
3. What is the chemical symbol for Gold?
A) Go
B) Gd
C) Au
D) Ag
Correct Answer: C
Rationale: The symbol 'Au' is derived from the Latin word for gold, *Aurum*.
4. Which gas do plants primarily absorb from the atmosphere?
A) Oxygen
B) Nitrogen
C) Carbon Dioxide
D) Argon
Correct Answer: C
Rationale: Plants use carbon dioxide during photosynthesis to produce
glucose and oxygen.
5. What is the largest organ in the human body?
A) Liver
B) Heart
,C) Skin
D) Lung
Correct Answer: C
Rationale: The skin is the largest organ, covering and protecting the entire
body.
6. What is the speed of light approximately in a vacuum?
A) 300,000 km/s
B) 100,000 km/s
C) 500,000 km/s
D) 50,000 km/s
Correct Answer: A
Rationale: The speed of light is precisely 299,792,458 meters per second,
which is commonly approximated to 300,000 km/s.
7. Which element is necessary for the formation of hemoglobin?
A) Calcium
B) Potassium
C) Iron
D) Magnesium
Correct Answer: C
Rationale: Hemoglobin is the protein in red blood cells that carries oxygen,
and it requires iron at its core.
, 8. What type of rock is formed by cooling magma?
A) Sedimentary
B) Metamorphic
C) Igneous
D) Fossilized
Correct Answer: C
Rationale: Igneous rocks (from Latin *ignis* meaning fire) are formed by the
cooling and solidification of magma or lava.
9. Which scientist proposed the three laws of motion?
A) Albert Einstein
B) Isaac Newton
C) Galileo Galilei
D) Nikola Tesla
Correct Answer: B
Rationale: Sir Isaac Newton formulated the three laws of motion in his work
*Philosophiæ Naturalis Principia Mathematica*.
10. What is the powerhouse of the cell?
A) Nucleus
B) Ribosome
C) Mitochondria
D) Golgi apparatus
AND CORRECT ANSWERS WITH
RATIONALES
Set 1: General Science (Questions 1-40)
1. What is the hardest known natural substance?
A) Gold
B) Iron
C) Diamond
D) Platinum
Correct Answer: C
Rationale: Diamond is an allotrope of carbon where each atom is bonded to
four others in a rigid tetrahedral structure, making it extremely hard.
2. Which planet is known as the "Morning Star" or "Evening Star"?
A) Mars
B) Venus
C) Mercury
D) Jupiter
Correct Answer: B
,Rationale: Venus appears bright in the sky just before sunrise or after
sunset due to its thick atmosphere reflecting sunlight, making it the
"Morning/Evening Star."
3. What is the chemical symbol for Gold?
A) Go
B) Gd
C) Au
D) Ag
Correct Answer: C
Rationale: The symbol 'Au' is derived from the Latin word for gold, *Aurum*.
4. Which gas do plants primarily absorb from the atmosphere?
A) Oxygen
B) Nitrogen
C) Carbon Dioxide
D) Argon
Correct Answer: C
Rationale: Plants use carbon dioxide during photosynthesis to produce
glucose and oxygen.
5. What is the largest organ in the human body?
A) Liver
B) Heart
,C) Skin
D) Lung
Correct Answer: C
Rationale: The skin is the largest organ, covering and protecting the entire
body.
6. What is the speed of light approximately in a vacuum?
A) 300,000 km/s
B) 100,000 km/s
C) 500,000 km/s
D) 50,000 km/s
Correct Answer: A
Rationale: The speed of light is precisely 299,792,458 meters per second,
which is commonly approximated to 300,000 km/s.
7. Which element is necessary for the formation of hemoglobin?
A) Calcium
B) Potassium
C) Iron
D) Magnesium
Correct Answer: C
Rationale: Hemoglobin is the protein in red blood cells that carries oxygen,
and it requires iron at its core.
, 8. What type of rock is formed by cooling magma?
A) Sedimentary
B) Metamorphic
C) Igneous
D) Fossilized
Correct Answer: C
Rationale: Igneous rocks (from Latin *ignis* meaning fire) are formed by the
cooling and solidification of magma or lava.
9. Which scientist proposed the three laws of motion?
A) Albert Einstein
B) Isaac Newton
C) Galileo Galilei
D) Nikola Tesla
Correct Answer: B
Rationale: Sir Isaac Newton formulated the three laws of motion in his work
*Philosophiæ Naturalis Principia Mathematica*.
10. What is the powerhouse of the cell?
A) Nucleus
B) Ribosome
C) Mitochondria
D) Golgi apparatus
