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NLN-PAX Science Questions and Correct
Answers Updated 2025 Grade A
-196 degrees Celsius - ANSThe boiling point of liquid nitrogen at one atmosphere pressure is 77 K. This temperature is equivalent to 0 K - ANSWhich temp is known as absolute zero 1.1 amp - ANSHow much current is drawn by a light bulb that has a resistance of 100 R with a voltage of 110 V? (V = IR) 14 - ANSWhich of these pH values represents the most basic solution 2 - ANSWhat is the pH of a solution whose H+ ion concentration is 1x10- mole per liter 273 K - ANSWater freezes at 0 degrees Celsius. On the kelvin temperature scale, this is equivalent to 2Na+Cl2->2NaCl - ANSEquation that best illustrates a synthesis reaction 3 - ANSWhat coefficient must be placed before the iron(Fe) to balance the reaction? __Fe+4H2O->Fe3O4+4H 30 students in a class carefully measure the length and width of 20 peanut shells. They also count the number and note the size of the peanuts inside.
This info is recorded on various graphs showing the numbers of nuts and the different sizes. The collected evidence of the peanuts gives the students an idea of the extent of - ANSVariation within a species 30.0 ohms - ANSWhen 3 resistors of 10.0 ohms each are placed in series, the total resistance is 50-75% - ANSIf a red light is passed through a dilute solution of chlorophyll solution, the spectrophotometer will detect what amount of transmittance of this light? 500 - ANSThe weight of an adult human in Newton's is closest to 67.2 - ANSGiven 3.0 miles of krypton gas, Kr(g), how many liters will this sample occupy at STP? 7 - ANSThe atomic number of flourine is 9. How many electrons are contained in the second principal energy level of a flourine atom in the ground state? 72/min 120/80mmHg - ANSWhich measurement shows the normal pulse and blood pressure values for a patient 8.0 omega - ANSA simple series circuit carries a current of 3.0 amp when the potential difference across it is 24.0 volts, the resistance of this circuit is
A person who was in an auto accident has formed a blood clot at the site of the injury. One event that can lead to formation of a blood clot is that - ANSRuptured platelets release thromboplastin A reduced amount of dissolved oxygen - ANSWhich of these conditions most likely explains the sudden death of many fish in a river on a hot day in summer A student focuses sunlight to a point with a thin converging lens. Which of these direct measurements can the student make as a result of this experiment? - ANSThe approximate focal length of the lens A tincture is a solution in which - ANSalcohol is the solvent A woman suddenly chokes on a piece of food and clutches frantically at her throat. An immediate remedy is to - ANSApply quick, hard pressures successively to her abdomen, just beneath her diaphragm Ability to engulf bacteria - ANSDifferent types of WBC's are classified histologically, they are distinguished from one another's base on their morphology and their 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? - ANSAs the pressure increases, the volume decreases
Active transport - ANSAll the glucose filtered from the blood in the glomerulus into the Bowman's capsule of the kidney nephron is returned to the tissue fluid while passing along the proximal tubule. This rapid return is effected by the process of active transport - ANSSugar molecules enter a cell against a concentration gradient by the process of active transport - ANSSugar molecules enter a cell against a concentration gradient by the process of Aid in the absorption of calcium - ANSThe growth and development of bone is assisted by the use of vitamin D because vitamin D can Air is drawn into the lungs - ANSWhen the rib cage moves upward and outward and the diaphragm flattens out All of these groups of land plants produce seeds except - ANSMoist forest plants, such as mosses and ferns alpha particle - ANSWhich of these could be stopped by a sheet of paper? an element - ANSIf attempts to decompose a substance prove unsuccessful, the substance is probably An example of the most complex level of organization in a frog is the - ANSRespiratory system
constant, what will be the effect of an increase in pressure on the volume of a gas? At room temp., which of these substances exists as diatomic molecules - ANSOxygen ATP - ANSWhich of these substances carries energy within cells and is produced as a result of cellular respiration? Axon - ANSThe extension of a neuron that carries the impulse to another cell is called blue-green algae - ANSOrganism that uses nitrogen directly from the air Bones - ANSAnimals like snails and clams contained within a hard shell differ from humans because they lack Br2(g)โ>Br2(s) - ANSHeat energy is absorbed in which of these phase changes calorie and joule - ANSWhich of these pairs of units measures the same quantity? Calorimeter - ANSWhich of these instruments is used to measure the amount of heat exchanged in a system? cardiac muscle - ANSThe heart is composed of which type of tissue
cardiovascular system - ANSWhat organ system does NOT provide for the excretion of substances Catalysts - ANSEnzymes that are involved in biochemical reactions are organic Cell plates are synthesized - ANSThe process of nuclear cell division in the cell reproduction of plants differs from mammals. A major difference is that centripetal force - ANSThe physics principle that is primarily used in developing a roller coaster ride is Cerebellum - ANSThe region of the brain most concerned with coordinating somatic motor function is cerebral cortex - ANSAmnesia in humans is the loss of memory. Which of these parts of the brain has been affected when someone is suffering from amnesia caused by head trauma? Cerebrum - ANSWhich part of the human central nervous system controls voluntary movements Chlorine - ANSSodium will react most readily with
Diffraction - ANSThe bending of a wave around an obstacle is called Diffusion - ANSThe process by which oxygen travels from the air into your lungs and then into your blood is called Diffusion - ANSWhich of these processes is illustrated by the spreading out of ammonia vapor in a closed room? Diffusion - ANSWithin a living cell, the oxygen (O2) from a mixture of O and carbon dioxide (CO2) is used up. This creates a concentration gradient across the cell membrane, drawing O2 across the membrane from the outside in, a process known as Diffusion - ANSWithin a living cell, the oxygen from a mixture of O2 and carbon dioxide is used up. This creates a concentration gradient across the cell membrane, drawing O2 across the membrane from the outside in, a process known as dissolve in water - ANSWhich is an example of a physical property? A substances ability to Distinguish color - ANSAn animal who's retina has no cone cells probably can not earthworm - ANSWhich of these organisms have the most complex digestive system
ecological succession - ANSAn area now covered with shrubs and small trees and occasionally gets swampy in the spring was once a pond, this is an example of Ectoderm - ANSThe germ layer that gives rise to the skin and nervous system Efficiency - ANSWhich aspect of a simple machine is represented by the ratio work output to work input Electric charges - ANSCoulomb's law is most closely associated with electroencephalogram - ANSelectrical activity in the brain is recorded as an Element - ANSA substance composed of similar atoms that can not be broke down chemically is an Energy - ANSThe calorie and kilocalorie are units of Enzyme B - ANSA lab technician has the choice of four different enzymes to use in an experiment that will run at 25ยฐC. The optimal temperatures of enzymes using the Kelvin scale are: Enzyme A: 273 K, Enzyme B: 298 K, Enzyme C: 310 K, Enzyme D: 325 K. Which enzyme would be the best to use in this experiment? Epiglottis - ANSThe larynx is covered by the ________ so that food does not enter the trachea
Glucose is the solute and water is the solvent - ANSThe growth and development of bone is assisted by the use of vitamin D because vitamin D can Guard cells which can be found in the leaves of plants are most closely associated with which of these processes - ANSEvaporation of water from a plant HCl (hydrochloric acid) - ANSWhich of these is not an organic compound? Helium - ANSExactly 2.0 moles of an element weigh 8.0 grams. Which of the following is true? Hormones - ANSDuctless glands in the human body secrete If a person is fasting for 24 hours and ingests no carbs, the liver will provide for the body's need by - ANSConverting glycogen into glucose If the nights temp drops 50 degrees, the road runners internal energy conservation permits a lowering of a body temp to - ANS94 degrees Impulse transmission - ANSWhich of these processes occurs at a neuromuscular junction? In a study of the effect of cocaine on the brains of rats, 2 groups of animals were selected. Each day, group A was injected with water alone. In such a study group B was included as - ANSA control group
In classical physics, light is viewed as part of the electromagnetic spectrum, traveling in the form of transverse waves. Quantum physics proposes that light is composed of quanta called - ANSPhotons In classifying all living things on earth, which groups would sort all life into two groups? - ANSProkaryotes/eukaryotes In ecological succession, the first living thing to colonize a hitherto barren area is called a - ANSPioneer organism In order to observe the endoplasmic reticulum in a cell, a scientist would use - ANSElectron microscope In terms of matter, the term heterogeneous may be applied to - ANSMixtures, but not elements or compounds incomplete dominance - ANSa cross between a plant with red flowers and one bearing white flowers produces pink flowers, this is an example of Increase the rate of impulse transport - ANSThe function of the myelin sheath that surrounds many neurons is to increases - ANSThe second law of thermodynamics states that with every spontaneous process, the entropy of the universe
Liquid diet of 6% alcohol - ANSWhich of these factors is a variable in Cicero and Wozniak's research? liver - ANSThe organ that works to detoxify the blood and to produce bile is the losing electrons - ANSSolid objects become positively charged by Loudness - ANSThe amplitude of a sound wave is most closely related to its Lymphocytes - ANSAs part of the human immune response, which of these cells are responsible to producing antibodies? Mendel - ANSThe law of dominance was proposed by which scientist Most internal gas exchanges in the human respiratory tract occurs across the capillaries of which of these structures - ANSAlveoli natural selection - ANSCharles Darwin theory of evolution suggests that the reason for the various differences between species is a result of Neurons - ANSGanglia are made up of a cluster of Neurons - ANSSynapses are the gaps between neutral - ANSA solution with hydrogen ion concentration of 1x10-7 is
new substance - ANSA chemical change always involves the formation of a Night blindness in humans is caused by a lack of - ANSVitamin A Nonmetals - ANSThe atoms of an element with 7 valence electrons are most probably classified as North - ANSThe succession of flora and fauna encountered while climbing a mountain in the northern hemisphere is similar to that found when traveling from the base of the same mountain in which of these general directions? Objects at rest tend to remain at rest - ANSA magician rapidly pulls a tablecloth from a table, leaving the dishes undisturbed. Which of these principles of physics explains the "trick"? Periodontitis is an inflammatory condition of the - ANSGum tissue that surrounds the neck of each tooth Photon - ANSA particle of light energy is called Photons - ANSQuantum physics proposes that light is composed of quanta called Phototropism - ANSDescribes how the stem of a plant grows toward the light
Retina - ANSThe light sensitive cells of the eye are called rods and cones. Which layer of the eye are they found in Ribosomes - ANSA cell which manufactures a large amount of protein for export would have an abundance of organelles called right atrium - ANSBlood returning to the heart from the body travels through the vena cava and enters the right atrium, right ventricle, lungs, left atrium, left ventricle - ANSIdentify the correct sequence of blood flow through the chambers of the heart. Seniniferous tubules - ANSwhich of these structures of the male reproductive system carries sperm cells from the testes to the lower part of the abdomen Serve as prey for many other animals - ANSOne possible reason that animals such as mice, moles, and rabbits have such rapid rates of reproduction is that they snake - ANSWhich would be classified as a vertebrae specific heat - ANS1kg of solid X at 10 degrees C and 1kg of solid Y at 10 degrees C each absorbs 5 joules of heat energy. The final temps of X and Y are 15 degrees C and 20 degrees C. Compared to X, Y must have a lower
Stimulus - ANSWhen 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 Suspension - ANSA material that settles out of a reaction is termed a Swell up and eventually burst - ANSWhen a human RBC is placed in distilled water it will Tendon - ANSAttaches muscle to bone The arm muscle - ANSTissue that is striated with multinucleate cells is found at The brain and the spinal cord make up the - ANSCentral Nervous System (CNS) The cervix - ANSThe Pap test can detect cancer in the female reproductive tract at an early stage, requiring cells scraped from The energy associated with an objects motion is termed - ANSKinetic energy The filtration rate of water remains constant and the reabsorption or water increases - ANSWhich of these changes occurs in the kidneys when a person becomes dehydrated
