PAX Science Exam Questions and Answers 2022

A person blows his breath into a straw that is placed in limewater. The limewater becomes cloudy because the person's breath contains - carbon dioxide A student focuses sunlight to a point with a thin converging (conv ...

A person blows his breath into a straw that is placed in limewater. The limewater becomes cloudy because the person's breath contains - carbon dioxide A student focuses sunlight to a point with a thin converging (convex) lens. Which of these direct measurements can the student make as a result of this experiment? - The approximate focal length of the lens. A woman suddenly chokes on a piece of food and clutches frantically at her throat. An immediate remedy is to - apply quick, hard pressures successively to her abdomen, just beneath her diaphragm. An unknown gas is more dense than air, does not support combustion, and turns a limewater solution cloudy. This gas is most probably - carbon dioxide Guard cells which can be found in the leaves of plants are most closely associated with which of these processes? - Evaporation of water from the plant. If a red light is passed through a dilute solution of chlorophyll solution, the spectrophotometer will detect what amount of transmittance of this light? - 50 - 75% If the medulla of the brain in a human was damaged, which of these conditions would most likely result? - Difficulty in breathing Night blindness in humans is caused by a lack of - Vitamin A In varieties of matter, the term heterogeneous may be applied to - mixtures, but not elements or compounds. Heat energy is absorbed in which of these phase changes? - Br2 (l) -> Br2(g) Periodontitis is an inflammatory condition of the - gum tissue that surrounds the neck of each tooth. The atoms of an element with seven valence electrons are most probably classified as - nonmetals. The bending of a wave around an obstacle is known as - diffraction The inherited factors that are transmitted in an organism from generation to generation are called its - genotype Which of these conditions is associated with smoking? - emphysema Which of these equations best illustrates a synthesis reaction? - 2Na + Cl2 -> 2NaCl Which of these pairs of units measures the same quantity? - Newton and joule / Newton and watt ? Which of these quantities is a vector quantity? - Force Which of these single instruments may be used to measure the current flowing through a circuit? - Ammeter Which of these substances contains a nonpolar covalent bond? - O2 Which part of the cell structure controls the passage of materials into and out of the cell? - Plasma membrane. Which part of the human central nervous system controls voluntary movements? - Cerebrum. While working in the chemistry laboratory, a student spills dilute hydrochloric acid on her hand. What is the first action this student should take? - Flush her hand with large quantities of water. Within which of these structures of the female reproductive tract is the human egg fertilized? - Fallopian tube. A tincture is a solution in which - alcohol is the solvent. A circuit contains three 3-ohm (W) resistors in series. What is the equivalent resistance of this combination? - 9W A quantity that has both magnitude and direction is called a(n) - vector. 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? - Feathers for flying. A substance that increases the speed of a reaction by lowering its activation energy is called - a catalyst An example of an adaptation to prevent water loss in plants is - waxy epidermis At room temperature, which of these substances exists as diatomic molecules? - oxygen 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 - structural isomers. The calorie and the kilocalorie are units of - energy The force of gravity on an object is that object's - weight The light sensitive cells of the eye are called rods and cones. Which of these layers of the eye are they found in? - retina The meiotic division of cells leads to the production of cells that - contain half the usual number of chromosomes. The most probable area of study that would show the prevalence of mental illness in mid-Manhattan is that of - epidemiology The normal boiling temperature for water is 100° when measured on which of these scales? - celsius The vertical columns on the periodic chart are known as - groups What is the pH of a solution whose H+ ion concentration is 1 x 10-2 mole per liter? - 2 When a column of air is vibrating at the same rate as a tuning fork, the process is referred to as - resonance When a population is in Hardy-Weinberg equilibrium, which of these conditions must be present? - The population is isolated from other populations. When three resistors of 10.0 ohms each are placed in series, the total resistance is - 30.0 ohms When your muscles atrophy, they - waste away Which of these changes occurs in the kidneys when a person becomes dehydrated? - The filtration rate of water remains constant and the reabsorption of water increases. Which of these could be stopped by a sheet of paper? - Alpha particle Which of these is an example of a simple machine? - lever, pulley, inclined plane Which of these organisms might be found in contaminated well water? - Giardia Which of these processes occurs at a neuromuscular junction? - Impulse transmission. 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 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 away from the ammonium hydroxide. 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 - ruptured platelets release thromboplastin 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? - 120/.80 mmHg Human testes produce - spermatozoa Iodized salt is used to prevent a human condition known as - goiter The organ that filters metabolic waste from the blood is the - kidney The process of nuclear cell division in the cell reproduction of plants differs from mammals. A major difference is that - cell plates are synthesized Unicellular organisms that have a nucleus and can swim with the aid of cilia are examples of - protozoans Which of these hydrocarbons is a member of the benzene family? - Toluene Which of these organisms use nitrogen directly from the air? - blue-green algae Which of these particles can only be found in the nucleus of an atom? - protons and neutrons Which of these processes is responsible for the recorded production of CO2 by yeast cells from sugar solution? - anaerobic respiration Which of these quantities is most closely associated with an object's inertia? - mass Which of these sequences of anatomic organization, from the simplest level to the most complex, is the correct sequence? - tissue, organ, organ system to organism. Which of these temperatures is known as Absolute Zero