ASVAB General Science Practice Test 1

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Which layer of the atmosphere is closest to the earth?

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The troposphere begins at the Earth's surface and extends up 4-12 miles high. Almost all weather occurs in the Troposphere.

Which of the following is NOT a blood type?

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The four blood types are A, B, AB, and O. Type AB is the universal recipient, and type O is the universal donor.

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

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The law of conservation of energy states that the total energy of an isolated system remains constant. Energy cannot be created or destroyed, but it can change from one form to another. For example, an object dropped from a rooftop will undergo a change from potential energy to kinetic energy and hit the floor with a force equal to the amount of work done on the object by gravity.

Which of these planets is located farthest from the sun?

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The order of the planets from the sun is: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.

Which of the following is true of chemical elements?

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Chemical elements are substances containing only atoms of a single type. The element Carbon, for example, only contains Carbon atoms. Molecules are compounds of the same or different elements. Chemical elements include metals, metalloids, and nonmetals.

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

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Force is the product of mass and acceleration. Mass has units of kilograms and acceleration has units of meters per second per second. In honor of Isaac Newton and his equation F=ma, force is measured in newtons.

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

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When the original rock is subjected to extreme heat and pressure, profound physical and chemical changes can occur. The three main types of rocks are metamorphic, igneous, and sedimentary. Metamorphic rocks make up a large part of the Earth's crust. Common metamorphic rocks include marble, slate, gneiss, quartzite, and schist.

Bile is produced by the

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Bile is a dark, bitter fluid produced continuously by the liver. Bile helps to digest lipids within the small intestine.

Which of the following is a characteristic of the autonomic nervous system?

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The somatic nervous system controls voluntary actions, while the autonomic nervous system functions primarily below the level of consciousness to control functions such as heart rate, digestion, respiratory rate, salivation, perspiration, breathing, and swallowing. The central nervous system consists of the brain and spinal cord.

Mitosis is the process by which:

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Mitosis is the process by which cells replicate their chromosomes. The information contained in the cell’s nucleus is duplicated and one cell splits into two. This process occurs in all somatic cells.

Which of the following are NOT decomposers?

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Vultures are considered to be scavengers since they eat dead animals. Decomposers are organisms that break down organic matter from dead animals and plants into simpler substances.

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

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Platelets are small proteins in the bloodstream that react when the body signals an injury, and are the primary mechanism of clotting.

Which of the following is an example of a mineral?

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Sodium chloride is another word for salt, a mineral. Flaxseed is a source of fat. Minerals are a type of micronutrient, but micronutrients are not an example of minerals. Vitamin D is a type of vitamin.

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

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Iron is found at the center of each of the hemoglobin subunits and is responsible for ‘grabbing’ oxygen from the air in the lungs, and releasing it as it travels through your body. As a result, iron deficiency can cause a lowered level of red blood cells, and lower your ability to exercise!

How many grams are in one kilogram?

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Mass is measured in grams. One kilogram equals 1,000 grams, and one gram equals 1,000 milligrams.

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.

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Newton's First Law is often called the law of inertia. Newton's Second Law: Force=Mass x Acceleration. Newton's Third Law: For every action, there is an equal and opposite re-action.

Which one of the following clouds are mid-level clouds?

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Mid-level clouds, or middle clouds, occur at altitudes of 6,000 to 20,000 feet. Cirrus = High Clouds, Alto = Middle Clouds, Stratus = Low Clouds.

These subatomic particles have a positive electric charge.

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The basic unit of matter is called the Atom. Atoms consist of a dense nucleus surrounded by a cloud of negatively charged electrons. The nucleus contains a mixture of protons which are positively charged, and neutrons, which are electrically neutral.

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