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NLN Exam Prep (Latest Update 2025 / 2026)
Practice Questions and Answers | Grade A | 100%
Correct (Verified Solutions)
Question:
1 kilogram (kg) of solid X at 10°C and 1 kg of solid Y at 10°C each absorb 5 joules of heat energy. The final temperatures of X and Y are 15°C and 20°C, respectively. Compared to X, Y must have a lower specific heat. conductive heat. heat of fusion. heat of vaporization. Answer: specific heat.
Question:
A drop of dilute ammonium hydroxide (NH4OH) is placed on one side of a slide containing a large number of swimming paramecium. Under this condition, which of these behaviors of the paramecia will be observed? They will eventually all swim toward the ammonium hydroxide. They will show no net change in behavior to the ammonium hydroxide. They will all be instantly killed by the ammonium hydroxide. They will eventually all swim away from the ammonium hydroxide. Answer: They will eventually all swim away from the ammonium hydroxide.
Question:
A method for determining the blood alcohol content of a subject is to do a Mantoux test. do a Dick test. use a Breathalyzer. inspect the size of the pupils. Answer: use a Breathalyzer.
Question:
A physician measures the pulse and blood pressure (BP) of all patients on a routine basis. Which of these measurements show the normal BP values for a resting adult patient? 125/95 mm Hg 120/80 mm Hg 100/80 mm Hg 72/120 mm Hg Answer: 120/80 mm Hg
Question:
A woman suddenly chokes on a piece of food and clutches frantically at her throat. An immediate remedy is to have her bend forward and tell her to cough. insert a finger or a blunt object toward the back of the mouth. apply quick, hard pressures successively to her abdomen, just beneath her diaphragm. phone "emergency" for help
In diagnostic testing, the electroencephalogram permits the physician to examine the impulses of the specialized muscle cells of the heart. examine the impulses of the nerve cells within the brain. measure the pressure within the eye. measure the amount of air upon exhalation. Answer: examine the impulses of the nerve cells within the brain.
Question:
In ecological succession, the first living thing to colonize a hitherto barren area is called a producer. primary consumer. pioneer organism. carnivore. Answer: pioneer organism.
Question:
In varieties of matter, the term heterogeneous may be applied to elements, but not compounds. compounds, but not elements. compounds and elements, but not mixtures. mixtures, but not elements or compounds. Answer: mixtures, but not elements or compounds.
Question:
Periodontitis is an inflammatory condition of the gum tissue that surrounds the neck of each tooth. pulp that contains nerve cells and blood vessels of the tooth. dentin that surrounds the soft part of a tooth. enamel that provides a hard surface for chewing. Answer: gum tissue that surrounds the neck of each tooth.
Question:
The atoms of an element with seven valence electrons are most probably classified as metals. nonmetals. metalloids. noble gases. Answer: metals.
Question:
The bending of a wave around an obstacle is known as diffraction. deflection. refraction. reflection. Answer:
spindle fibers are missing. cell plates are synthesized. Answer: homologous chromosomes are paired
Question:
In animals, the cell is split from the outside by a contractile ring, forming a cleavage furrow. A layer of actin and myosin filaments underneath the plasma membrane at the cell center begins to contract until the cell is essentially pinched in half. In plants, a new cell wall forms inside the cell that grows outward until the formation of two new cells. The assembly of a new cell wall forms by vesicles filled with cellulose and lignin, which eventually fuse together to create a new cell wall, and the parent cell splits in two.
Question:
Which of these conditions is associated with smoking? Esophageal varices. Tonsillitis. Emphysema. Blindness. Answer: Emphysema.
Question:
Which of these equations best illustrates a synthesis reaction? 2Na + Cl2 - > 2NaCl NaOH + HCl - > NaCl + H2O 2H2O2 - > 2H2O + O
CH4 + 2O2 - > CO2 + 2H2O
Answer: 2Na + Cl2 - > 2NaCl
Question:
Which of these hydrocarbons is a member of the benzene family? Toluene. Ethyne. Propanone. Methanol. Answer: Toluene.
Question:
Which of these particles can only be found in the nucleus of an atom? protons, only. electrons, only. protons and neutrons. neutrons and electrons. Answer: protons and neutrons.
Question:
Question:
Diatomic oxygen is made up of the same two elements, and they equally share the 4 electrons that make up the double bond between them. They're equally electronegative, which means that there are not any partial charges for each element. Since neither atom pulls harder, it's a non- polar covalent bond.
Question:
Which of these temperatures is known as Absolute Zero? 0°C 0 K positive 273°C negative 273 K Answer: 0 K
Question:
Which part of the cell structure controls the passage of materials into and out of the cell? Golgi apparatus. Ribosome. Nuclear membrane. Plasma membrane. Answer: Plasma membrane.
Question:
A tincture is a solution in which alcohol is the solvent. water is the solvent. alcohol is the solute. water is the solute. Answer: alcohol is the solvent.
Question:
According to the Ideal Gas Equation (PV = nRT), if the temperature and amount of gas are kept constant, what will be the effect of an increase in pressure on the volume of a gas? As the pressure increases, the volume decreases. As the pressure increases, the volume increases. The volume equalizes despite pressure changes. The volume and pressure are unrelated Answer: As the pressure increases, the volume decreases. Volume and pressure have an inverse relationship
Question:
As an object falls freely near the surface of the earth, its speed increases, representing a transformation of friction to kenetic energy. kinetic energy to friction. kinetic energy to potential energy. potential energy to kinetic energy.
an increase in hemoglobin in the blood. a decrease in CO2 concentration in the blood. Answer: an increase in CO2 concentration in the blood.
Question:
If a person is fasting for 24 hours and ingests no carbohydrates, the liver will provide for the body's need by converting glycogen into glucose. breaking down red blood cells. emulsifying fat. producing more bile. Answer: converting glycogen into glucose.
Question:
If all of the second-order consumers within an ecosystem of a region were removed, the most likely short-term effect would be a decrease in decomposers. an increase in producers. an increase in the number of first-order consumers. a decrease in the number of first-order consumers. Answer: an increase in the number of first-order consumers.
Question:
In order to observe the endoplasmic reticulum in a cell, a scientist would use a light-microscope. an electron microscope. an ultracentrifuge. dissecting instruments. Answer: an electron microscope.
Question:
Muscles are attached to bone by which of these structures? Cartilage. Ligament. Capsula. Tendon. Answer: Tendon.
Question:
Sodium will react most readily with potassium. helium. chlorine. boron. Answer: chlorine.
the human genome.
Question:
The physics principle that is primarily used in developing a rollercoaster ride is centripetal force. specific gravity. quantum energy. certainty principle. Answer: centripetal force.
Question:
The surface of the moon has almost no atmosphere and is one-sixth the gravitational acceleration of the earth. If a feather and a hammer were dropped near the surface of the moon, the feather would hit the surface first because it has less mass. the hammer would hit the surface first because it has more mass. the feather and the hammer would hit the surface at the same time. it is impossible to predict which would hit the surface first without more information. Answer: the feather and the hammer would hit the surface at the same time. mass does not affect gravitational pull; theoretically, all things should fall at the same rate, regardless of how heavy they are
Question:
The vertical columns on the periodic chart are known as
periods. ions. metalloids. groups. Answer: groups.
Question:
What is the pH of a solution whose H+ ion concentration is 1 x 10-2 mole per liter? 1 2 12 14 Answer: 2
Question:
When a drop of dilute nitric acid is added to water surrounding a hydra, the animal draws in its tentacles. The acid is acting as a hormone. an impulse. a stimulus. a response. Answer: a stimulus.
C-OH
Question:
Which of these changes occurs in the kidneys when a person becomes dehydrated? The kidneys filter more water and there is less reabsorption of water from the blood. The filtration rate of water remains constant and the reabsorption of water increases. The filtration rate of water increases and the reabsorption of water remains constant. No changes occur in kidney function. Answer: The filtration rate of water remains constant and the reabsorption of water increases.
Question:
Which of these is the correct sequence of chambers through which blood flows in the human heart and lungs? Right ventricle; right atrium; lungs; left atrium; left ventricle. Right atrium; right ventricle; lungs; left atrium; left ventricle. Left ventricle; left atrium; lungs; right atrium; right ventricle. Left atrium; left ventricle; lungs; right atrium; right ventricle. Answer: Right atrium; right ventricle; lungs; left atrium; left ventricle
Question:
Which of these pH values represents the most basic solution? 2 4
Answer: 14
Question:
The philodendron plant was remarkably resilient. Resilient means shiny. tall. productive. hardy. Answer: hardy.
Question:
The police confiscated the stolen items. Confiscated means salvaged. secreted. recovered. seized. Answer: seized.
Question:
The general's behavior was described as choleric. Choleric means
