PAX Science NLN Exams collection (answered) .

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PAX Science NLN Exams collection (answered) 2022. 1. A person blows his breath into a straw that is placed in limewater. The limewater becomes cloudy because the person's breath contains A.) car... bon dioxide. B.) hydrogen. C.) oxygen. D.) nitrogen. - answer: carbon dioxide. 2. 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? A.) 125/95 mm Hg B.) 120/80 mm Hg C.) 100/80 mm Hg D.) 72/120 mm Hg - answer: 120/80 mm Hg 3. A woman suddenly chokes on a piece of food and clutches frantically at her throat. An immediate remedy is to A.) have her bend forward and tell her to cough. B.) insert a finger or a blunt object toward the back of the mouth. C.) apply quick, hard pressures successively to her abdomen, just beneath her diaphragm. D.) phone "emergency" for help. - answer: apply quick, hard pressures successively to her abdomen, just beneath her diaphragm. 4. An unknown gas is more dense than air, does not support combustion, and turns a limewater solution cloudy. This gas is most probably A.) ammonia. B.) methane. C.) carbon dioxide. D.) hydrogen. - answer: carbon dioxide. 5. Human testes produce A.) eggs. B.) follicle stimulating hormone. C.) growth hormone. D.) spermatozoa. - answer: spermatozoa. 6. If a red light is passed through a dilute solution of chlorophyll solution, the spectrophotometer will detect what amount of transmittance of this light? A.) 100% B.) 50 - 75% C.) Less than 25% D.) None - answer: 50 - 75% 7. In diagnostic testing, the electroencephalogram permits the physician to A.) examine the impulses of the specialized muscle cells of the heart. B.) examine the impulses of the nerve cells within the brain. C.) measure the pressure within the eye. D.) measure the amount of air upon exhalation. - answer: examine the impulses of the nerve cells within the brain. 8. To sterilize a metal probe in the office, a dentist could use a steam sterilizer. If unavailable, the next most effective method to sterilize the instrument would be A.) boiling it in water for 15 minutes. B.) dipping it into a concentrated acid solution. C.) heating it in a hot air oven at 160°C for 20 minutes. D.) washing it in soap and water. - answer: boiling it in water for 15 minutes. 9. In varieties of matter, the term heterogeneous may be applied to A.) elements, but not compounds. B.) compounds, but not elements. C.) compounds and elements, but not mixtures. D.) mixtures, but not elements or compounds. - answer: mixtures, but not elements or compounds. 10. Heat energy is absorbed in which of these phase changes? A.) Br2 (l) -> Br2(s) B.) Br2 (g) --> Br2(l) C.) Br2 (l) -> Br2(g) D.) Br2 (g) -> Br2(s) - answer: Br2 (l) -> Br2(g) 11. Periodontitis is an inflammatory condition of the A.) gum tissue that surrounds the neck of each tooth. B.) pulp that contains nerve cells and blood vessels of the tooth. C.) dentin that surrounds the soft part of a tooth. D.) enamel that provides a hard surface for chewing. - answer: gum tissue that surrounds the neck of each tooth. 12. The atoms of an element with seven valence electrons are most probably classified as A.) metals. B.) nonmetals. C.) metalloids. D.) noble gases. - answer: nonmetals. 13. The inherited factors that are transmitted in an organism from generation to generation are called its A.) homozygote. B.) heterozygote. C.) genotype. D.) phenotype. - answer: genotype. 14. The process of nuclear cell division in the cell reproduction of plants differs from mammals. A major difference is that A.) homologous chromosomes are paired. B.) centrioles are replicated. C.) spindle fibers are missing. D.) cell plates are synthesized. - answer: cell plates are synthesized. 15. Unicellular organisms that have a nucleus and can swim with the aid of cilia are examples of A.) monerans. B.) plants. C.) fungi. D.) protozoans. - answer: protozoans. 16. Which of these conditions is associated with smoking? A.) Esophageal varices. B.) Tonsillitis. C.) Emphysema. D.) Blindness. - answer: Emphysema. 17. Which of these equations best illustrates a synthesis reaction? A.) 2Na + Cl2 -> 2NaCl B.) NaOH + HCl -> NaCl + H2O C.) 2H2O2 -> 2H2O + O2 D.) CH4 + 2O2 -> CO2 + 2H2O - answer: 2Na + Cl2 -> 2NaCl 18. Which of these hydrocarbons is a member of the benzene family? A.) Toluene. B.) Ethyne. C.) Propanone. D.) Methanol. - answer: Toluene. 19. Which of these quantities is most closely associated with an object's inertia? A.) Weight. B.) Energy. C.) Power. D.) Mass. - answer: Mass 20. Which of these sequences of anatomic organization, from the simplest level to the most complex, is the correct sequence? A.) From tissue, organ, organ system to organism. B.) From organ system, organ, tissue to organism. C.) From tissue, organ system, organ to organism. D.) From organ, organ system, tissue to organism. - answer: From tissue, organ, organ system to organism 21. Which of these single instruments may be used to measure the current flowing through a circuit? A.) A voltmeter. B.) An ammeter. C.) A potentiometer. D.) An ohmmeter. - answer: An ammeter. 22. Which of these temperatures is known as Absolute Zero? A.) 0°C B.) 0 K C.) positive 273°C D.) negative 273 K - answer: 0 K 23. Which part of the human central nervous system controls voluntary movements? A.) Spinal cord. B.) Cerebellum. C.) Cerebrum. D.) Medulla. - answer: Cerebrum. 24. Within which of these structures of the female reproductive tract is the human egg fertilized? A.) Uterus. B.) Fallopian tube. C.) Vagina. D.) Cervix. - answer: Fallopian tube. 25. You cut your finger rather deeply while slicing an apple. Which of these actions should you take first? A.) Apply a sterile adhesive bandage. B.) Press the cut surface to stop the flow of blood. C.) Swab the wound with mild antiseptic. D.) Wash the wound continuously with cold running water. - answer: Wash the wound continuously with cold running water. 26. A lens that focuses distant light to a single point is known as a A.) converging lens. B.) diverging lens. C.) concave lens. D.) prismatic lens. - answer: converging lens. 27. A magician rapidly pulls a tablecloth from a table, leaving the dishes undisturbed. Which of these principles of physics explains this "trick"? A.) Gravitational force depends directly on mass. B.) Objects at rest tend to remain at rest. C.) Force equals mass times acceleration. D.) An object traveling at constant velocity has no net force on it. - answer: Objects at rest tend to remain at rest. 28. A quantity that has both magnitude and direction is called a(n) A.) resultant. B.) scalar. C.) vector. D.) undefined unit. - answer: vector. 29. A recently discovered species has these characteristics: amniotic eggs, a four-chambered heart, and lightweight, honeycombed bones. Which of these ADDITIONAL characteristics is likely to be present? A.) Mammary glands. B.) External fertilization. C.) Ectotherms. D.) Feathers for flying. - answer: Feathers for flying. 30. Amnesia 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? A.) Cerebral cortex. B.) Cerebellum. C.) Medulla oblongata. D.) Spinal cord. - answer: Cerebral cortex. 31. An example of the most complex level of organization in a frog is the A.) epithelium. B.) striated muscle. C.) respiratory system. D.) stomach. - answer: respiratory system. 32. Anaerobic respiration occurs in muscle tissue when it cannot get sufficient oxygen to function aerobically. Which of these conditions is most likely to directly result from this? A.) Cramps. B.) Necrosis. C.) Bleeding. D.) Swelling. - answer: Cramps 33. Enzymes that are involved in biochemical reactions are organic A.) colloids. B.) catalysts. C.) cathodes. D.) constants. - answer: Catalysts 34. In a study on the effect of cocaine on the brains of rats, two groups of animals were selected. Each day, Group A was injected with the drug dissolved in water, whereas Group B was injected with water alone. In such a study Group B is included as A.) an experimental group. B.) a test group. C.) an exercise group. D.) a control group. - answer: a control group. 35. In corn plants, the gene that codes for the presence of chlorophyll is sometimes missing. The resulting seedlings are albino and will not survive. This lethal gene appears in corn populations because A.) the soil nutrients will not allow the plant to produce chlorophyll. B.) the parent plants that produced the seeds carried the recessive gene for the albino trait. C.) the farmer used herbicides, which destroyed the chlorophyll in the seedlings. D.) the seeds were old and stored improperly, resulting in the lethal trait. - answer: the parent plants that produced the seeds carried the recessive gene for the albino trait 36. In the reaction of iron with water shown below, what coefficient must be placed before the iron (Fe) to balance the reaction? Fe + 4H2O ° Fe3O4 + 4H2 A.) 2 B.) 3 C.) 4 D.) 6 - answer: 3 37. A circuit contains three 3-ohm (W) resistors in series. What is the equivalent resistance of this combination? - answer: 9W 38. An example of an adaptation to prevent water loss in plants is - answer: waxy epidermis 39. At room temperature, which of these substances exists as diatomic molecules? - answer: oxygen 40. Compounds with the same type and number of atoms and the same chemical bonds but different spatial arrangements of these bonds and atoms are called - answer: structural isomers. 41. The calorie and the kilocalorie are units of - answer: energy 42. The force of gravity on an object is that object's - answer: weight 43. The light sensitive cells of the eye are called rods and cones. Which of these layers of the eye are they found in? - answer: retina 44. The meiotic division of cells leads to the production of cells that - answer: contain half the usual number of chromosomes. 45. The most probable area of study that would show the prevalence of mental illness in mid-Manhattan is that of - answer: epidemiology 46. The normal boiling temperature for water is 100° when measured on which of these scales? - answer: celsius 47. What is the pH of a solution whose H+ ion concentration is 1 x 10-2 mole per liter? - answer: 2 48. When a column of air is vibrating at the same rate as a tuning fork, the process is referred to as - answer: resonance 49. When a population is in Hardy-Weinberg equilibrium, which of these conditions must be present? - answer: The population is isolated from other populations. 50. When three resistors of 10.0 ohms each are placed in series, the total resistance is - answer: 30.0 ohms 51. Which of these changes occurs in the kidneys when a person becomes dehydrated? - answer: The filtration rate of water remains constant and the reabsorption of water increases. 52. Which of these could be stopped by a sheet of paper? - answer: Alpha particle 53. Which of these is an example of a simple machine? - answer: lever, pulley, inclined plane 54. Which of these organisms might be found in contaminated well water? - answer: Giardia 55. Which of these processes occurs at a neuromuscular junction? - answer: Impulse transmission. .......................................Continues [Show More]

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