LPN PRE ENTRANCE EXAM – SCIENCE
QUESTIONS AND ANSWERS UPDATED
(2024/2025) (VERIFIED ANSWERS)
Reflection - ANS ✓The bouncing back of a wave when it hits a surface through
which it cannot pass.
Nonpolar covalent bond - ANS ✓A type of covalent bond in which electrons are
shared equally between two atoms of similar electronegativity.
Mass number - ANS ✓the sum of the number of neutrons and protons in an
atomic nucleus
Atomic number - ANS ✓The number of protons in the nucleus of an atom
Endocrine glands - ANS ✓Ductless or tubeless organs or groups of cells that
secrete hormones directly into the bloodstream
Exocrine glands - ANS ✓Glands that produce a secretion carried by a duct or
tube. Digestive and tear glands
Paper chromatography - ANS ✓a method that uses the natural capillary action
of liquids to separate substances into their components
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Cloud chamber - ANS ✓makes the path of ionizing radiation rays visible. The
device reveals the paths of high speed charged particles
Diffusion - ANS ✓Movement of molecules from an area of higher concentration
to an area of lower concentration.
Acid - ANS ✓A solution with a ph less than 7
Geotropism - ANS ✓any movement or growth of a living organism in response
to the force of gravity
Producer - ANS ✓Able to make food for themselves (plants)
Benedict's Solution - ANS ✓used to detect the presence of monosaccharides
Pancreas - ANS ✓Digestive organ that regulates the hormones Insulin and
Glucagon
Osmosis - ANS ✓Diffusion of molecules through a semipermeable membrane
from a place of higher concentration to a place of lower concentration until the
concentration on both sides is equal.
Homeostasis - ANS ✓Maintaining a constant internal environment
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