ASVAB Study Guide 2027 | Practice Questions, Correct
Answers & Detailed Rationales | Complete Exam
1. Bone is composed primarily of which inorganic material?
A) *Calcium
B) Phosphorus
C) Collagen
D) Potassium
Answer: A
Rationale: Calcium is the most abundant mineral in bones and the entire body.
2. Which of these is a biome?
A) *Desert
B) Cornfield
C) Herd of bison
D) Beehive
Answer: A
Rationale: A biome is a large ecological community with specific plants and animals, such as a desert.
3. Which planet orbits closest to Earth?
A) Mercury
B) *Venus
C) Jupiter
D) Saturn
Answer: B
Rationale: Venus is the second planet from the sun; Earth is third, making Venus closest.
,4. What is the name of the phenomenon when a star suddenly increases in brightness and then
disappears from view?
A) Aurora
B) Galaxy
C) Black hole
D) *Supernova
Answer: D
Rationale: A supernova occurs when a star burns brighter then collapses, fading from view.
5. Which organism has cells that contain mitochondria?
A) Whale
B) Mushroom
C) Tulip
D) *All of the above
Answer: D
Rationale: Plant, animal, and fungi cells all contain mitochondria.
6. Isotopes of an element will have the same number of _____ and different numbers of _____.
A) Electrons; neutrons
B) Neutrons; electrons
C) *Protons; neutrons
D) Protons; electrons
Answer: C
Rationale: Isotopes have the same protons but different neutrons.
7. What condition can be diagnosed by an electrocardiogram (EKG)?
,A) Diabetes
B) Torn ligaments
C) Cancer
D) *Tachycardia
Answer: D
Rationale: An EKG shows the heart's electrical activity and can diagnose arrhythmias like tachycardia.
8. What are the negatively charged particles inside an atom?
A) Protons
B) Neutrons
C) *Electrons
D) Ions
Answer: C
Rationale: Electrons are negatively charged and orbit the nucleus.
9. Which organism regulates its body temperature externally?
A) *Lobster
B) Dolphin
C) Whale
D) Pelican
Answer: A
Rationale: Crustaceans use behavioral techniques (e.g., moving to shallow water) to regulate
temperature.
10. A box sliding down a ramp experiences all of the following forces EXCEPT?
A) *Tension
B) Friction
C) Gravity
, D) Normal
Answer: A
Rationale: Tension results from objects being pulled or hung, not from a box sliding down a ramp.
11. Which organism is a decomposer?
A) Apple trees
B) *Mushrooms
C) Goats
D) Lions
Answer: B
Rationale: Fungi break down organic material from dead plants and animals.
12. Which pH level is classified as a base?
A) 1
B) 4
C) 6
D) *8
Answer: D
Rationale: Bases have a pH between 7 and 14.
13. Which body system is responsible for the release of growth hormones?
A) Digestive system
B) *Endocrine system
C) Nervous system
D) Circulatory system
Answer: B
Rationale: The endocrine system releases hormones, including growth hormone.
Answers & Detailed Rationales | Complete Exam
1. Bone is composed primarily of which inorganic material?
A) *Calcium
B) Phosphorus
C) Collagen
D) Potassium
Answer: A
Rationale: Calcium is the most abundant mineral in bones and the entire body.
2. Which of these is a biome?
A) *Desert
B) Cornfield
C) Herd of bison
D) Beehive
Answer: A
Rationale: A biome is a large ecological community with specific plants and animals, such as a desert.
3. Which planet orbits closest to Earth?
A) Mercury
B) *Venus
C) Jupiter
D) Saturn
Answer: B
Rationale: Venus is the second planet from the sun; Earth is third, making Venus closest.
,4. What is the name of the phenomenon when a star suddenly increases in brightness and then
disappears from view?
A) Aurora
B) Galaxy
C) Black hole
D) *Supernova
Answer: D
Rationale: A supernova occurs when a star burns brighter then collapses, fading from view.
5. Which organism has cells that contain mitochondria?
A) Whale
B) Mushroom
C) Tulip
D) *All of the above
Answer: D
Rationale: Plant, animal, and fungi cells all contain mitochondria.
6. Isotopes of an element will have the same number of _____ and different numbers of _____.
A) Electrons; neutrons
B) Neutrons; electrons
C) *Protons; neutrons
D) Protons; electrons
Answer: C
Rationale: Isotopes have the same protons but different neutrons.
7. What condition can be diagnosed by an electrocardiogram (EKG)?
,A) Diabetes
B) Torn ligaments
C) Cancer
D) *Tachycardia
Answer: D
Rationale: An EKG shows the heart's electrical activity and can diagnose arrhythmias like tachycardia.
8. What are the negatively charged particles inside an atom?
A) Protons
B) Neutrons
C) *Electrons
D) Ions
Answer: C
Rationale: Electrons are negatively charged and orbit the nucleus.
9. Which organism regulates its body temperature externally?
A) *Lobster
B) Dolphin
C) Whale
D) Pelican
Answer: A
Rationale: Crustaceans use behavioral techniques (e.g., moving to shallow water) to regulate
temperature.
10. A box sliding down a ramp experiences all of the following forces EXCEPT?
A) *Tension
B) Friction
C) Gravity
, D) Normal
Answer: A
Rationale: Tension results from objects being pulled or hung, not from a box sliding down a ramp.
11. Which organism is a decomposer?
A) Apple trees
B) *Mushrooms
C) Goats
D) Lions
Answer: B
Rationale: Fungi break down organic material from dead plants and animals.
12. Which pH level is classified as a base?
A) 1
B) 4
C) 6
D) *8
Answer: D
Rationale: Bases have a pH between 7 and 14.
13. Which body system is responsible for the release of growth hormones?
A) Digestive system
B) *Endocrine system
C) Nervous system
D) Circulatory system
Answer: B
Rationale: The endocrine system releases hormones, including growth hormone.
