ASVAB General Science Practice Test 1 — Questions and Answers

Question 1: Which of the following is an example of a mineral?

Flaxseed
Micronutrients
Vitamin D
Sodium chloride (Correct answer)

Correct answer: Sodium chloride

A mineral is a naturally occurring inorganic solid with a definite chemical composition and a crystalline structure. Sodium chloride (NaCl), commonly known as table salt, fits this definition as it is found naturally as the mineral halite. Flaxseed is an organic plant product, Vitamin D is an organic compound, and micronutrients are a broad category of essential nutrients.

Question 2: Which of the following is NOT a blood type?

AB
A
O
X (Correct answer)

Correct answer: X

The major human blood types are classified within the ABO and Rh systems. The ABO system includes types A, B, AB, and O, based on the presence or absence of specific antigens on red blood cells. 'X' is not a recognized or standard human blood type within these established classification systems.

Question 3: Which of these planets is located farthest from the sun?

Neptune (Correct answer)
Saturn
Jupiter
Uranus

Correct answer: Neptune

The planets in our solar system, in order of increasing distance from the sun, are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Among the given options, Neptune is the eighth and farthest known planet from the sun. Therefore, it is located farthest from the sun.

Question 4: How many grams are in one kilogram?

10
100
1,000 (Correct answer)
10,000

Correct answer: 1,000

In the metric system, the prefix 'kilo-' denotes a factor of one thousand (10^3). Therefore, one kilogram (kg) is equivalent to 1,000 grams (g). This is a fundamental conversion used in scientific and everyday measurements.

Question 5: Which one of the following clouds are mid-level clouds?

Cirrocumulus
Altostratus (Correct answer)
Stratus
Cirrus

Correct answer: Altostratus

Clouds are classified by their altitude and appearance. Altostratus clouds are specifically categorized as mid-level clouds, typically forming between 2,000 and 7,000 meters (6,500 to 23,000 feet) in the atmosphere. Cirrocumulus and Cirrus are high-level clouds, while Stratus clouds are low-level.

Question 6: Which of the following are NOT decomposers?

earthworms
vultures (Correct answer)
bacteria
fungi

Correct answer: vultures

Decomposers are organisms that break down dead organic matter, recycling nutrients back into the ecosystem. Bacteria and fungi are primary decomposers, and earthworms are detritivores that contribute to decomposition. Vultures, however, are scavengers; they consume dead animals but do not break down organic matter at a molecular level like true decomposers.

Question 7: Bile is produced by the

pancreas
stomach
liver (Correct answer)
kidneys

Correct answer: liver

Bile is a crucial digestive fluid that aids in the digestion and absorption of fats in the small intestine. It is produced by the liver, then stored and concentrated in the gallbladder before being released. The pancreas, stomach, and kidneys perform different functions in the digestive and excretory systems.

Question 8: What kind of rock is formed when existing rock types are changed by heat and pressure?

Metamorphic (Correct answer)
Igneous
Sedimentary
Meteorological

Correct answer: Metamorphic

Metamorphic rocks are formed when existing rock types (igneous, sedimentary, or other metamorphic rocks) are transformed by intense heat, pressure, or chemical reactions deep within the Earth's crust. This process alters their mineral composition, texture, and structure without completely melting them. Igneous rocks form from magma/lava, and sedimentary rocks from compacted sediments.

Question 9: These subatomic particles have a positive electric charge.

Neutrons
Protons (Correct answer)
Electrons
Atoms

Correct answer: Protons

Atoms are composed of three primary subatomic particles: protons, neutrons, and electrons. Protons are found in the nucleus and carry a positive electric charge. Electrons orbit the nucleus and have a negative charge, while neutrons are also in the nucleus but have no electric charge.

Question 10: Which of the following is a characteristic of the autonomic nervous system?

It regulates the voluntary control of body movements through the skeletal muscles.
It regulates involuntary activity in the heart, stomach, lungs, and intestines. (Correct answer)
It is thought to be the center of intelligence.
It is the part of the nervous system consisting of the brain and spinal cord.

Correct answer: It regulates involuntary activity in the heart, stomach, lungs, and intestines.

The autonomic nervous system (ANS) is responsible for regulating involuntary bodily functions that occur without conscious thought. These include essential processes like heart rate, digestion, respiration, blood pressure, and glandular secretions. In contrast, the somatic nervous system controls voluntary movements of skeletal muscles.

Question 11: Which layer of the atmosphere is closest to the earth?

Mesosphere
Stratosphere
Troposphere (Correct answer)
Thermosphere

Correct answer: Troposphere

The Earth's atmosphere is divided into several layers based on temperature and composition. The troposphere is the lowest layer, extending from the Earth's surface up to an average height of about 8-15 kilometers. It is the layer where most weather phenomena occur and where we live.

Question 12: Which of Newton's laws proves that: An object at rest will stay at rest unless an external force acts upon it. An object in motion won't change its velocity unless an external force acts upon it.

Newton's First Law of Motion (Correct answer)
Newton's Second Law of Motion
Newton's Third Law of Motion
Newton's Law of Universal Gravitation

Correct answer: Newton's First Law of Motion

Newton's First Law of Motion, also known as the Law of Inertia, states that an object at rest will remain at rest, and an object in motion will remain in motion with the same velocity, unless acted upon by an unbalanced external force. This law describes the inherent resistance of objects to changes in their state of motion.

Question 13: The law of conservation of energy can be restated as which of the following?

The total energy of a system always diminishes.
Energy cannot be created or destroyed, only changed. (Correct answer)
The sum of all of the forces is equivalent to the amount of energy in a system.
Mechanical and potential energy share an inverse relationship.

Correct answer: Energy cannot be created or destroyed, only changed.

The law of conservation of energy is a fundamental principle in physics. It states that energy cannot be created or destroyed within an isolated system, but it can be transformed from one form to another (e.g., potential energy to kinetic energy, chemical energy to heat). The total amount of energy in the system remains constant.

Question 14: The International System (SI) unit of force is which of the following?

Newton (Correct answer)
Joule
Watt
Dyne

Correct answer: Newton

The International System of Units (SI) designates the Newton (N) as the standard unit of force. One Newton is defined as the force required to accelerate a mass of one kilogram at a rate of one meter per second squared (1 N = 1 kg·m/s²). Joule is the unit for energy, and Watt is the unit for power.

Question 15: Mitosis is the process by which:

eukaryotic cells degrade.
energy is liberated.
somatic cells replicate. (Correct answer)
ATP is produced.

Correct answer: somatic cells replicate.

Mitosis is a fundamental process of cell division where a single parent cell divides into two identical daughter cells. This process is essential for growth, repair, and asexual reproduction in eukaryotic organisms, specifically for the replication of somatic (non-reproductive) cells. It ensures that each new cell receives a complete set of chromosomes.

Question 16: Which of the following is true of chemical elements?

They are made up of different molecules.
They are divided into metals and metalloids.
They cannot combine to form new compounds.
They are pure substances consisting of one type of atom. (Correct answer)

Correct answer: They are pure substances consisting of one type of atom.

A chemical element is defined as a pure substance that cannot be broken down into simpler substances by chemical means. Each element is uniquely characterized by the number of protons in its atoms, meaning it consists solely of one type of atom. This distinguishes elements from compounds, which are formed from two or more different types of atoms chemically bonded together.

Question 17: Which element in the protein hemoglobin, found in red blood cells, is responsible for binding oxygen?

Iron (Correct answer)
Calcium
Magnesium
Titanium

Correct answer: Iron

Hemoglobin is a protein in red blood cells that transports oxygen from the lungs to the rest of the body. At the core of each of hemoglobin's four heme groups is an iron atom. This iron atom is crucial because it reversibly binds to oxygen molecules, allowing for efficient oxygen uptake and release.

Question 18: When a blood vessel is injured, which of the following is responsible for clotting?

White blood cells
Platelets (Correct answer)
Actin filaments
Dead bacteria

Correct answer: Platelets

Platelets, also known as thrombocytes, are small, irregular-shaped cell fragments in the blood that play a crucial role in hemostasis, the process of stopping bleeding. When a blood vessel is damaged, platelets aggregate at the site of injury and form a plug, initiating the complex cascade of events that leads to the formation of a blood clot.

ASVAB General Science Practice Test 1

Which of the following is an example of a mineral?