ASVAB FULL-LENGTH PRACTICE EXAM
130 Questions | Verified Answers | Detailed Rationales
TABLE OF CONTENTS
Section Subject Area Questions
I General Science (GS) 1–15
II Arithmetic Reasoning (AR) 16–35
III Word Knowledge (WK) 36–50
IV Paragraph Comprehension (PC) 51–60
V Mathematics Knowledge (MK) 61–80
VI Electronics Information (EI) 81–95
VII Auto & Shop Information (AS) 96–110
VIII Mechanical Comprehension (MC) 111–125
IX Assembling Objects (AO) 126–130
SECTION I: GENERAL SCIENCE (GS)
Questions 1–15
1. Which of the following cellular organelles is primarily responsible for producing adenosine triphosphate (ATP)
through aerobic respiration?
A) Ribosome 🔵
B) Golgi apparatus 🔵
C) Mitochondrion 🔴
D) Endoplasmic reticulum 🔵
Rationale: The mitochondrion is known as the "powerhouse of the cell" because it hosts the electron transport chain
and oxidative phosphorylation, which generate the majority of ATP. Ribosomes make proteins, the Golgi
modifies/packages proteins, and the ER synthesizes lipids and processes proteins.
2. (SATA) A patient presents with metabolic alkalosis. Which of the following compensatory mechanisms would the
body initiate? (Select all that apply)
, A) Increased respiratory rate 🔵
B) Decreased respiratory rate 🔴
C) Increased renal excretion of bicarbonate 🔵
D) Increased renal reabsorption of hydrogen ions 🔴
Rationale: In metabolic alkalosis (high pH, high HCO₃⁻), the body compensates by hypoventilating (decreased
respiratory rate) to retain CO₂ and lower pH. Renally, the kidneys will excrete more bicarbonate and retain more H⁺ to
correct the imbalance. Increased respiratory rate is compensation for acidosis, not alkalosis.
3. The human heart is situated in which anatomical cavity, specifically within a fluid-filled sac called the pericardium?
A) Abdominal cavity 🔵
B) Pelvic cavity 🔵
C) Thoracic cavity 🔴
D) Cranial cavity 🔵
Rationale: The heart is located in the thoracic cavity (specifically the mediastinum). The pericardium is the sac
surrounding it. The abdominal cavity contains digestive organs, the pelvic cavity contains reproductive organs, and the
cranial cavity contains the brain.
4. Which element is a noble gas and has an atomic number of 18?
A) Krypton 🔵
B) Argon 🔴
C) Neon 🔵
D) Xenon 🔵
Rationale: Argon (Ar) has the atomic number 18. Krypton is 36, Neon is 10, and Xenon is 54. Noble gases are
characterized by having a full valence electron shell, making them highly inert.
5. In the human digestive system, the majority of nutrient absorption occurs in which structure?
A) Stomach 🔵
B) Large intestine 🔵
C) Small intestine 🔴
D) Esophagus 🔵
Rationale: The small intestine, with its villi and microvilli, provides an enormous surface area for the absorption of
carbohydrates, proteins, fats, and most vitamins. The stomach absorbs very little (alcohol/aspirin), and the large
intestine mainly absorbs water and electrolytes.
6. A sample of DNA has 30% adenine. What percentage of cytosine would you expect to find?
A) 20% 🔴
B) 30% 🔵
C) 40% 🔵
D) 15% 🔵
,Rationale: Chargaff's rule states A=T and G=C. If A=30%, then T=30%. That accounts for 60%, leaving 40% for G+C.
Since G and C are equal, C = 20%.
7. Which blood type is the universal donor for red blood cell transfusions?
A) Type A 🔵
B) Type B 🔵
C) Type AB 🔵
D) Type O 🔴
Rationale: Type O negative blood lacks A, B, and Rh antigens on the red cell surface. Therefore, it will not trigger an
immune response in recipients of any other blood type, making it the universal donor.
8. Which layer of the Earth's atmosphere contains the ozone layer and experiences a temperature increase with
altitude?
A) Troposphere 🔵
B) Stratosphere 🔴
C) Mesosphere 🔵
D) Thermosphere 🔵
Rationale: The stratosphere houses the ozone layer. Ozone absorbs ultraviolet (UV) radiation from the sun, which
warms this layer, causing temperatures to increase with altitude (a temperature inversion). The troposphere cools with
altitude.
9. A car accelerates uniformly from rest to 25 m/s in 5 seconds. What is the car's acceleration?
A) 5 m/s² 🔴
B) 125 m/s² 🔵
C) 0.2 m/s² 🔵
D) 25 m/s² 🔵
Rationale: Acceleration = (Final Velocity - Initial Velocity) / Time. (25 m/s - 0 m/s) / 5 s = 5 m/s².
10. Which of the following is a function of the lymphatic system?
A) Transporting oxygen to tissues 🔵
B) Producing red blood cells 🔵
C) Returning interstitial fluid to the bloodstream 🔴
D) Secreting digestive enzymes 🔵
Rationale: The lymphatic system returns excess interstitial fluid (lymph) back to the circulatory system. It also plays a
critical role in immunity. RBCs are produced in bone marrow, oxygen is transported by the circulatory system, and
digestive enzymes come from the pancreas and glands.
11. Which hormone is produced by the pancreas and functions to lower blood glucose levels?
A) Glucagon 🔵
, B) Insulin 🔴
C) Cortisol 🔵
D) Thyroxine 🔵
Rationale: Insulin is released by beta cells in the islets of Langerhans in the pancreas. It facilitates the uptake of glucose
into cells, thereby lowering blood sugar. Glucagon does the opposite (raises blood sugar).
12. (SATA) Which of the following are considered vectors for the transmission of infectious diseases? (Select all that
apply)
A) Mosquitoes 🔴
B) Contaminated needles 🔵
C) Ticks 🔴
D) Fleas 🔴
Rationale: A biological vector is a living organism that transmits an infectious agent from an infected host to a new host
(e.g., mosquito = malaria, tick = Lyme, flea = plague). Contaminated needles are a vehicle (fomite) for transmission, not
a biological vector.
13. What is the pH of a solution with a hydrogen ion concentration [H⁺] of 1 x 10⁻⁵ M?
A) 5 🔴
B) 7 🔵
C) 9 🔵
D) 10 🔵
Rationale: pH = -log₁₀[H⁺]. If [H⁺] = 1 x 10⁻⁵, then pH = 5. A pH less than 7 is acidic.
14. Which of the following describes a convergent plate boundary?
A) Two plates sliding past each other horizontally 🔵
B) Two plates moving away from each other 🔵
C) Two plates colliding and moving toward each other 🔴
D) One plate remaining stationary while another moves 🔵
Rationale: Convergent boundaries occur when tectonic plates move toward each other and collide. This can cause
subduction (volcanoes) or mountain building (Himalayas). Sliding is transform; moving away is divergent.
15. A person has difficulty seeing distant objects clearly, but can see close objects well. This refractive error is most
likely:
A) Hyperopia 🔵
B) Myopia 🔴
C) Astigmatism 🔵
D) Presbyopia 🔵
Rationale: Myopia (nearsightedness) is the inability to see distant objects clearly because the image focuses in front of
the retina. Hyperopia is farsightedness (can't see close). Astigmatism is an irregular cornea; presbyopia is age-related
loss of accommodation.
130 Questions | Verified Answers | Detailed Rationales
TABLE OF CONTENTS
Section Subject Area Questions
I General Science (GS) 1–15
II Arithmetic Reasoning (AR) 16–35
III Word Knowledge (WK) 36–50
IV Paragraph Comprehension (PC) 51–60
V Mathematics Knowledge (MK) 61–80
VI Electronics Information (EI) 81–95
VII Auto & Shop Information (AS) 96–110
VIII Mechanical Comprehension (MC) 111–125
IX Assembling Objects (AO) 126–130
SECTION I: GENERAL SCIENCE (GS)
Questions 1–15
1. Which of the following cellular organelles is primarily responsible for producing adenosine triphosphate (ATP)
through aerobic respiration?
A) Ribosome 🔵
B) Golgi apparatus 🔵
C) Mitochondrion 🔴
D) Endoplasmic reticulum 🔵
Rationale: The mitochondrion is known as the "powerhouse of the cell" because it hosts the electron transport chain
and oxidative phosphorylation, which generate the majority of ATP. Ribosomes make proteins, the Golgi
modifies/packages proteins, and the ER synthesizes lipids and processes proteins.
2. (SATA) A patient presents with metabolic alkalosis. Which of the following compensatory mechanisms would the
body initiate? (Select all that apply)
, A) Increased respiratory rate 🔵
B) Decreased respiratory rate 🔴
C) Increased renal excretion of bicarbonate 🔵
D) Increased renal reabsorption of hydrogen ions 🔴
Rationale: In metabolic alkalosis (high pH, high HCO₃⁻), the body compensates by hypoventilating (decreased
respiratory rate) to retain CO₂ and lower pH. Renally, the kidneys will excrete more bicarbonate and retain more H⁺ to
correct the imbalance. Increased respiratory rate is compensation for acidosis, not alkalosis.
3. The human heart is situated in which anatomical cavity, specifically within a fluid-filled sac called the pericardium?
A) Abdominal cavity 🔵
B) Pelvic cavity 🔵
C) Thoracic cavity 🔴
D) Cranial cavity 🔵
Rationale: The heart is located in the thoracic cavity (specifically the mediastinum). The pericardium is the sac
surrounding it. The abdominal cavity contains digestive organs, the pelvic cavity contains reproductive organs, and the
cranial cavity contains the brain.
4. Which element is a noble gas and has an atomic number of 18?
A) Krypton 🔵
B) Argon 🔴
C) Neon 🔵
D) Xenon 🔵
Rationale: Argon (Ar) has the atomic number 18. Krypton is 36, Neon is 10, and Xenon is 54. Noble gases are
characterized by having a full valence electron shell, making them highly inert.
5. In the human digestive system, the majority of nutrient absorption occurs in which structure?
A) Stomach 🔵
B) Large intestine 🔵
C) Small intestine 🔴
D) Esophagus 🔵
Rationale: The small intestine, with its villi and microvilli, provides an enormous surface area for the absorption of
carbohydrates, proteins, fats, and most vitamins. The stomach absorbs very little (alcohol/aspirin), and the large
intestine mainly absorbs water and electrolytes.
6. A sample of DNA has 30% adenine. What percentage of cytosine would you expect to find?
A) 20% 🔴
B) 30% 🔵
C) 40% 🔵
D) 15% 🔵
,Rationale: Chargaff's rule states A=T and G=C. If A=30%, then T=30%. That accounts for 60%, leaving 40% for G+C.
Since G and C are equal, C = 20%.
7. Which blood type is the universal donor for red blood cell transfusions?
A) Type A 🔵
B) Type B 🔵
C) Type AB 🔵
D) Type O 🔴
Rationale: Type O negative blood lacks A, B, and Rh antigens on the red cell surface. Therefore, it will not trigger an
immune response in recipients of any other blood type, making it the universal donor.
8. Which layer of the Earth's atmosphere contains the ozone layer and experiences a temperature increase with
altitude?
A) Troposphere 🔵
B) Stratosphere 🔴
C) Mesosphere 🔵
D) Thermosphere 🔵
Rationale: The stratosphere houses the ozone layer. Ozone absorbs ultraviolet (UV) radiation from the sun, which
warms this layer, causing temperatures to increase with altitude (a temperature inversion). The troposphere cools with
altitude.
9. A car accelerates uniformly from rest to 25 m/s in 5 seconds. What is the car's acceleration?
A) 5 m/s² 🔴
B) 125 m/s² 🔵
C) 0.2 m/s² 🔵
D) 25 m/s² 🔵
Rationale: Acceleration = (Final Velocity - Initial Velocity) / Time. (25 m/s - 0 m/s) / 5 s = 5 m/s².
10. Which of the following is a function of the lymphatic system?
A) Transporting oxygen to tissues 🔵
B) Producing red blood cells 🔵
C) Returning interstitial fluid to the bloodstream 🔴
D) Secreting digestive enzymes 🔵
Rationale: The lymphatic system returns excess interstitial fluid (lymph) back to the circulatory system. It also plays a
critical role in immunity. RBCs are produced in bone marrow, oxygen is transported by the circulatory system, and
digestive enzymes come from the pancreas and glands.
11. Which hormone is produced by the pancreas and functions to lower blood glucose levels?
A) Glucagon 🔵
, B) Insulin 🔴
C) Cortisol 🔵
D) Thyroxine 🔵
Rationale: Insulin is released by beta cells in the islets of Langerhans in the pancreas. It facilitates the uptake of glucose
into cells, thereby lowering blood sugar. Glucagon does the opposite (raises blood sugar).
12. (SATA) Which of the following are considered vectors for the transmission of infectious diseases? (Select all that
apply)
A) Mosquitoes 🔴
B) Contaminated needles 🔵
C) Ticks 🔴
D) Fleas 🔴
Rationale: A biological vector is a living organism that transmits an infectious agent from an infected host to a new host
(e.g., mosquito = malaria, tick = Lyme, flea = plague). Contaminated needles are a vehicle (fomite) for transmission, not
a biological vector.
13. What is the pH of a solution with a hydrogen ion concentration [H⁺] of 1 x 10⁻⁵ M?
A) 5 🔴
B) 7 🔵
C) 9 🔵
D) 10 🔵
Rationale: pH = -log₁₀[H⁺]. If [H⁺] = 1 x 10⁻⁵, then pH = 5. A pH less than 7 is acidic.
14. Which of the following describes a convergent plate boundary?
A) Two plates sliding past each other horizontally 🔵
B) Two plates moving away from each other 🔵
C) Two plates colliding and moving toward each other 🔴
D) One plate remaining stationary while another moves 🔵
Rationale: Convergent boundaries occur when tectonic plates move toward each other and collide. This can cause
subduction (volcanoes) or mountain building (Himalayas). Sliding is transform; moving away is divergent.
15. A person has difficulty seeing distant objects clearly, but can see close objects well. This refractive error is most
likely:
A) Hyperopia 🔵
B) Myopia 🔴
C) Astigmatism 🔵
D) Presbyopia 🔵
Rationale: Myopia (nearsightedness) is the inability to see distant objects clearly because the image focuses in front of
the retina. Hyperopia is farsightedness (can't see close). Astigmatism is an irregular cornea; presbyopia is age-related
loss of accommodation.
