NLN Pax Science Practice Test

NLN Pax Science Practice Test Specific heat 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 a.) specific heat. b.) conductive heat c.). heat of fusion d.). heat of vaporization. They will eventually all swim away from the ammonium hydroxide is the correct answer 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? a.) They will eventually all swim toward the ammonium hydroxide. b.) They will show no net change in behavior to the ammonium hydroxide. c.) They will all be instantly killed by the ammonium hydroxide. d.) They will eventually all swim away from the ammonium hydroxide. carbon dioxide A person blows his breath into a straw that is placed in limewater. The limewater becomes cloudy because the person's breath contains a.) carbon dioxide. b.) hydrogen c.) oxygen. d.) nitrogen. ruptured platelets release thromboplastin 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 a.) red blood cells release hemoglobin b.) bone marrow cells decrease platelet production c.) white blood cells release antibodies d.) ruptured platelets release thromboplastin. carbon dioxide 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. Evaporation of water from the plant Guard cells which can be found in the leaves of plants are most closely associated with which of these processes? a.) Reproduction of a new plant b.) Evaporation of water from the plant. c.) Synthesis of organic substances in the plant. d.) Movement of organic and inorganic substances from soil to the plant. 50 - 75% 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 examine the impulses of the nerve cells within the brain 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. pioneer organism In ecological succession, the first living thing to colonize a hitherto barren area is called a a.) producer b.) primary consumer c.) pioneer organism d.) carnivore. vitamin A Night blindness in humans is caused by a lack of a.) Vitamin A b.) Niacin c.) Calcium d.) Vitamin D. mixtures, but not elements or compounds. 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. Br2 (l) -> Br2(g) 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) goiter Iodized salt is used to prevent a human condition known as a.) rickets b.) goiter c.) scurvy d.).beri-beri. gum tissue that surrounds the neck of each tooth 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. kidney The organ that filters metabolic waste from the blood is the a.) small intestine b.) liver c.) kidney d.) stomach. Cell plates are synthesized 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. protozoans 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. emphysema Which of these conditions is associated with smoking? a.) Esophageal varices b.) Tonsillitis c.) Emphysema d.) Blindness. blue-green algae Which of these organisms use nitrogen directly from the air? a.) Blue-green algae b.) Protozoa. c.) Plants d.) Worms. energy Which of these quantities is a vector quantity? a.) Force b.) Mass. c.) Energy d.) Time. 0 K