ACT Prep Exam Latest with complete
solution
Acceleration - ANSWER The rate of change of velocity
Acidic - ANSWER Having a pH less than 7
Acute - ANSWER (adj.) refers to an angle that is less than 90 degrees; (adj.) refers to a
triangle with angles that are all less than 90 degrees; sharp; quick and precise; intense
Aerobic Respiration - ANSWER The breakdown of glucose in the body of an animal to
supply muscles with oxygen.
Aerosol - ANSWER Solid or liquid particles suspended in gas
Alkalinity - ANSWER Having a pH greater than 7 (contrast with acidic, which is having a
pH less than 7).
Amino Acids - ANSWER Various organic compounds that link together to form proteins.
Anatomical - ANSWER Related to the structure of an organism
Antigen - ANSWER A substance such as a toxin or enzyme capable of eliciting an
immune response.
Antitoxin - ANSWER An antibody created for and capable of neneutralizing a toxin
Bacteria - ANSWER Single-celled microorganisms
Basalt - ANSWER Solidified lava; a dense, gray, fine-grained igneous rock
Biomass - ANSWER Total mass of all the living matter within a given area
Biosynthesis - ANSWER The production of a chemical compound within the body
Boiling Point - ANSWER The temperature a liquid must be to change states from liquid
to gas
Capillary - ANSWER A very slim tube; one of a network of extremely small blood
vessels
Carbohydrate - ANSWER Sugars and starches that serve as a major energy source for
animals
,Catalyst - ANSWER An agent that causes or speeds up a chemical reaction
Celsius - ANSWER A temperature scale in which the freezing point of water is 0
degrees and the boiling point is 100 degrees under normal atmospheric conditions
Cerebral Edema - ANSWER Brain swelling
Chlorophyll - ANSWER A green pigment produced in response to sunlight during
photosynthesis.
Cholesterol - ANSWER A soft, waxy compound found in the body and in the food we
eat.
Collinear - ANSWER 23 of 450
Collinear
Passing through or lying on the same straight line.
Comet - ANSWER A celestial body, having an elongated, curved vapor tail, which is
seen only in that part of its orbit that is relatively close to the sun
Common Difference - ANSWER The equal distance between one number in an
arithmetic sequence and the next (for example, the common difference between 4, 6,
and 8 is 2.).
Common Ratio - ANSWER The ratio of one term and the next in a geometric sequence
(for example, the common ratio between 2, 4, and 8 is 4/2 and 8/4, or 2.)
Compressibility - ANSWER The ease with which pressure can alter the volume of
matter
Congruent - ANSWER Equal in length or measure
Cos - ANSWER Abbreviation of cosine
Cosine - ANSWER The ratio of the adjacent side (with respect to the angle of reference)
to the hypotenuse in a right triangle
Cube - ANSWER A term raised to the third power; a regular solid having six congruent
faces
Cubic Inch - ANSWER The volume of a cube with edges that all measure one inch.
Cylindrical - ANSWER Having the shape of a cylinder, or a solid with circular ends and
straight sides
,Diagonal - ANSWER A line segment joining two nonadjacent vertices of a polygon or
solid (polyhedron).
Dilute - ANSWER To weaken the strength of a solution
Directly Proportional - ANSWER Increasing or decreasing together or with the same
ratio
Ecology - ANSWER The field of science that concentrates on relationships between
organisms and their environments
Emissions - ANSWER Things that are discharged (often gases into the air).
Emit - ANSWER To release particles such as light, heat, or gases.
Epicanthic Fold - ANSWER A fold of skin of the upper eyelid that only partly covers the
eye's inner corner
Equilibrium - ANSWER A state of balance
Erosion - ANSWER The wearing away of an object by outside forces, like wind or water
Evaporate - ANSWER To draw away moisture and convert into vapor
Experimental Variables - ANSWER Elements of an experiment that are changed
(distinguished from the constant, which is held the same in order to produce significant
results).
Fahrenheit - ANSWER A temperature scale in which the freezing point of water is 32
degrees and the boiling point is 212 degrees under normal atmospheric conditions
Fermentation - ANSWER The chemical process of breaking down an organic substance
into simpler substances such as the fermentation of sugar to alcohol
Friction - ANSWER The force resistant to motion
Galvanism - ANSWER A direct electrical current produced by chemical reactions
Gas - ANSWER A fluid (such as air) that is not independent in shape or volume but
tends to expand
Gas Chromatograph - ANSWER A device used to detect the composition of an
unknown material
Gastric Emptying - ANSWER The movement of the stomach's contents from the
stomach to the small intestine, and finally into the colon
, Gravity - ANSWER The force of attraction between two bodies of mass
Herbivorous - ANSWER A plant-eating organism
Hydrogen Bonding - ANSWER The chemical bonding of a hydrogen atom with another
electronegative atom.
Hypotenuse - ANSWER The longest side of a right triangle, which is always the side
opposite the right (90°) angle.
Igneous Rock - ANSWER Rock that is formed by the cooling and solidification of molten
magma
Ignition Temperature - ANSWER The temperature that a fuel must reach before
combustion can begin
Infrared - ANSWER Light energy having a wavelength greater the visible range; it is
experienced as heat.
Interior Angle - ANSWER An angle inside of a shape (that is, all of the interior angles in
a triangle have a sum of 180 degrees).
Intracellular - ANSWER Within a cell or cells
Isosceles Triangle - ANSWER A triangle with two congruent sides and two congruent
angles
Isotopes - ANSWER Two or more atoms with an identical atomic number and differing
in number of neutrons.
Kelvin - ANSWER A temperature scale in which absolute zero is 0 degrees K, the
freezing point of water is 273 degrees K, and the boiling point of water is 373 degrees K
Law of Sines - ANSWER The relationship within a triangle of the sine of angles and the
lengths of sides of a triangle.
Least Common Denominator (LCD) - ANSWER The smallest number (other than 0) that
is a multiple of a set of denominators (for example, the LCD of 14and16
1
4
and
1
6
is 12).
solution
Acceleration - ANSWER The rate of change of velocity
Acidic - ANSWER Having a pH less than 7
Acute - ANSWER (adj.) refers to an angle that is less than 90 degrees; (adj.) refers to a
triangle with angles that are all less than 90 degrees; sharp; quick and precise; intense
Aerobic Respiration - ANSWER The breakdown of glucose in the body of an animal to
supply muscles with oxygen.
Aerosol - ANSWER Solid or liquid particles suspended in gas
Alkalinity - ANSWER Having a pH greater than 7 (contrast with acidic, which is having a
pH less than 7).
Amino Acids - ANSWER Various organic compounds that link together to form proteins.
Anatomical - ANSWER Related to the structure of an organism
Antigen - ANSWER A substance such as a toxin or enzyme capable of eliciting an
immune response.
Antitoxin - ANSWER An antibody created for and capable of neneutralizing a toxin
Bacteria - ANSWER Single-celled microorganisms
Basalt - ANSWER Solidified lava; a dense, gray, fine-grained igneous rock
Biomass - ANSWER Total mass of all the living matter within a given area
Biosynthesis - ANSWER The production of a chemical compound within the body
Boiling Point - ANSWER The temperature a liquid must be to change states from liquid
to gas
Capillary - ANSWER A very slim tube; one of a network of extremely small blood
vessels
Carbohydrate - ANSWER Sugars and starches that serve as a major energy source for
animals
,Catalyst - ANSWER An agent that causes or speeds up a chemical reaction
Celsius - ANSWER A temperature scale in which the freezing point of water is 0
degrees and the boiling point is 100 degrees under normal atmospheric conditions
Cerebral Edema - ANSWER Brain swelling
Chlorophyll - ANSWER A green pigment produced in response to sunlight during
photosynthesis.
Cholesterol - ANSWER A soft, waxy compound found in the body and in the food we
eat.
Collinear - ANSWER 23 of 450
Collinear
Passing through or lying on the same straight line.
Comet - ANSWER A celestial body, having an elongated, curved vapor tail, which is
seen only in that part of its orbit that is relatively close to the sun
Common Difference - ANSWER The equal distance between one number in an
arithmetic sequence and the next (for example, the common difference between 4, 6,
and 8 is 2.).
Common Ratio - ANSWER The ratio of one term and the next in a geometric sequence
(for example, the common ratio between 2, 4, and 8 is 4/2 and 8/4, or 2.)
Compressibility - ANSWER The ease with which pressure can alter the volume of
matter
Congruent - ANSWER Equal in length or measure
Cos - ANSWER Abbreviation of cosine
Cosine - ANSWER The ratio of the adjacent side (with respect to the angle of reference)
to the hypotenuse in a right triangle
Cube - ANSWER A term raised to the third power; a regular solid having six congruent
faces
Cubic Inch - ANSWER The volume of a cube with edges that all measure one inch.
Cylindrical - ANSWER Having the shape of a cylinder, or a solid with circular ends and
straight sides
,Diagonal - ANSWER A line segment joining two nonadjacent vertices of a polygon or
solid (polyhedron).
Dilute - ANSWER To weaken the strength of a solution
Directly Proportional - ANSWER Increasing or decreasing together or with the same
ratio
Ecology - ANSWER The field of science that concentrates on relationships between
organisms and their environments
Emissions - ANSWER Things that are discharged (often gases into the air).
Emit - ANSWER To release particles such as light, heat, or gases.
Epicanthic Fold - ANSWER A fold of skin of the upper eyelid that only partly covers the
eye's inner corner
Equilibrium - ANSWER A state of balance
Erosion - ANSWER The wearing away of an object by outside forces, like wind or water
Evaporate - ANSWER To draw away moisture and convert into vapor
Experimental Variables - ANSWER Elements of an experiment that are changed
(distinguished from the constant, which is held the same in order to produce significant
results).
Fahrenheit - ANSWER A temperature scale in which the freezing point of water is 32
degrees and the boiling point is 212 degrees under normal atmospheric conditions
Fermentation - ANSWER The chemical process of breaking down an organic substance
into simpler substances such as the fermentation of sugar to alcohol
Friction - ANSWER The force resistant to motion
Galvanism - ANSWER A direct electrical current produced by chemical reactions
Gas - ANSWER A fluid (such as air) that is not independent in shape or volume but
tends to expand
Gas Chromatograph - ANSWER A device used to detect the composition of an
unknown material
Gastric Emptying - ANSWER The movement of the stomach's contents from the
stomach to the small intestine, and finally into the colon
, Gravity - ANSWER The force of attraction between two bodies of mass
Herbivorous - ANSWER A plant-eating organism
Hydrogen Bonding - ANSWER The chemical bonding of a hydrogen atom with another
electronegative atom.
Hypotenuse - ANSWER The longest side of a right triangle, which is always the side
opposite the right (90°) angle.
Igneous Rock - ANSWER Rock that is formed by the cooling and solidification of molten
magma
Ignition Temperature - ANSWER The temperature that a fuel must reach before
combustion can begin
Infrared - ANSWER Light energy having a wavelength greater the visible range; it is
experienced as heat.
Interior Angle - ANSWER An angle inside of a shape (that is, all of the interior angles in
a triangle have a sum of 180 degrees).
Intracellular - ANSWER Within a cell or cells
Isosceles Triangle - ANSWER A triangle with two congruent sides and two congruent
angles
Isotopes - ANSWER Two or more atoms with an identical atomic number and differing
in number of neutrons.
Kelvin - ANSWER A temperature scale in which absolute zero is 0 degrees K, the
freezing point of water is 273 degrees K, and the boiling point of water is 373 degrees K
Law of Sines - ANSWER The relationship within a triangle of the sine of angles and the
lengths of sides of a triangle.
Least Common Denominator (LCD) - ANSWER The smallest number (other than 0) that
is a multiple of a set of denominators (for example, the LCD of 14and16
1
4
and
1
6
is 12).
