PSIA Science Practice Test – All Questions

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A battery in electrical systems is a connected group of electrochemical cellsWhich of the following best defines the term 'battery' in electrical systems?Accelerated motion: understanding how velocity changes over timeWhich term describes motion in which the velocity of a moving object changes?Acceleration is the rate at which velocity changes over timeWhat is defined as a change in velocity (speed or direction) over a period of time?Aldebaran—the orange giant star that frames Taurus as the Eye of the BullWhich star is known as the orange giant star in the constellation Taurus?Algol—the second brightest star in Perseus and its curious brightness patternWhich star is recognized as the second brightest in the constellation Perseus?Antares: the Greek-derived name meaning rival of Mars and its place in ScorpiusWhich term describes the Greek-derived name for the supergiant star located in the constellation of Scorpius, rival of Mars?Anting as a window into behavioral ecology: how birds use ants to groom and ward off parasitesWhat scientific concept is illustrated by the interaction of birds and ants in the practice of anting?Archimedes’ buoyancy principle explains how buoyant force arises from displaced fluidWhich principle states that the weight lost by an object immersed in a fluid is equal to the weight of the fluid displaced?Artificial selection: choosing parents to cultivate desirable traits in farming and breedingWhat term describes the breeding process that selects for desired traits while eliminating undesired ones?Astrology vs Astronomy: Understanding the Zodiac and Why It MattersWhich term refers to the superstitious religion that places its faith in the zodiac?Astronomy is the science that studies stars, planets, and other celestial bodiesWhat is the field of science that studies stars, planets, and other celestial bodies?Atmospheric pressure: the air pressure created by the weight of the atmosphere on Earth's surfaceWhat term describes the air pressure resulting from the weight of the atmosphere above Earth?Atoms are the fundamental building blocks of matter explained for PSIA scienceWhat are the basic substances of which all things are made?Behemoth in Job: a legendary land giant that evokes dinosaur-like traitsWhich magnificent land animal, described in the book of Job, is thought to resemble a dinosaur?Betelgeuse is the closest red supergiant to Antares in terms of shared traitsWhat is the closest star to Earth that shares traits with Antares?Betelgeuse: the red supergiant star at the heart of OrionWhich star is recognized as a red supergiant in the constellation Orion?Biochemistry explains the chemical reactions that power living organismsWhat field of study focuses on the chemical reactions occurring within living organisms?Boiling is the process where heated liquid molecules turn into vapor, driven by vapor pressure reaching atmospheric pressureWhat is the process in which the molecules of a heated liquid evaporate?Bootes, the Herdsman: discover the myth, location, and standout star Arcturus in this constellationWhich constellation is known as "The Herdsman"?Callisto stands out as a heavily cratered moon among Jupiter’s major satellitesWhich of the following is one of Jupiter's moons?Calorimeter: the key tool for tracking changes in thermal energyWhat is the device used for measuring changes in thermal energy?Capillary action: why liquids rise or fall in tiny tubes and what that means for plants, inks, and filtersWhat is the phenomenon called when a liquid in a thin tube rises or falls?Cassiopeia: the five-star constellation shaped like a distorted W or M you can spot in the northern skyWhich constellation is made up of five stars and resembles a distorted W or M?Centaurus: the large southern constellation that resembles a centaurWhich large constellation resembles a centaur?Center of gravity: understanding the balance point where weight acts under gravityWhat is the term for the balance point of an object where weight can be considered concentrated?Cepheid variables are huge pulsating supergiants that map the universe through their brightness changesWhat type of star is characterized as a huge super giant variable that grows brighter or dimmer than usual?Cepheus sits closest to the north celestial pole among circumpolar constellationsWhich constellation is located near the celestial pole in the northern hemisphere?Ceres—the largest known asteroid and the first to be discovered, reshaping how we understand the early solar systemWhat is the largest known asteroid and the first to be discovered?Circuit breakers: how they protect electrical systems from overloads and short circuitsWhat device automatically protects an electrical system from short circuits and overloads?Circular reasoning: when two assumptions rely on each other, and why it matters in scienceWhich reasoning method involves basing two assumptions on each other?Circumpolar stars and why some celestial objects circle around the polesWhat term describes objects that appear to travel in a circle around celestial poles?Cohesion is the attraction that makes like molecules stick together, with water as the classic exampleWhat term describes the attraction that causes molecules of the same kind to stick together?Comparative biology explains the similarities and differences among organismsWhat is the study that focuses on similarities and differences between organisms?Conduction is heat transfer through direct contact, explained in simple termsWhat is defined as the transfer of heat through direct contact?Conduction: the primary heat transfer in solids explained for studentsWhat is the primary mechanism by which heat is transferred in a solid object?Conductor: the material that lets electrons move freely and power our worldWhat type of material is known for its ability to allow the transfer of electrons?Contour feathers are the feathers that give shape and smoothness to a bird's bodyIn feather anatomy, what does the term 'contour feather' refer to?Contour feathers shape a bird’s streamlined body and help it fly more efficientlyWhat type of feather helps provide a streamlined shape to birds?Convection currents: how temperature differences drive circulation inside liquidsWhat term describes the circulation within a liquid caused by temperature differences?Convection: how heat moves through fluids via their own motionWhich of the following refers to a system that allows heat transfer through the movement of fluid?Convection: why heated fluids rise and cooler fluids sinkWhat process involves heated fluids moving to the top while cooler fluids sink?Coolant keeps machines cool by moving heat away from critical partsWhat is a fluid used in machines or objects to control temperature called?Crater is the term for a small crater‑like depression on celestial bodiesWhat term describes a small crater-like depression on a celestial body?Deneb: the brightest white supergiant in Cygnus and what it tells us about stellar giantsWhat is the brightest white supergiant star in the constellation Cygnus?Density: understanding the amount of matter in a given volume and how it’s calculatedWhat term refers to the amount of matter in a known volume?Diffusion in fluids: how molecules mix and why it happensWhat is the process of mixing molecules of one fluid throughout another called?Diffusion: how substances spread evenly through a fluid and why it mattersWhich process allows substances to spread evenly throughout a fluid?Direct current explains how electric charge flows in one directionWhich of the following represents a charge that flows in one direction?Direct current is the unidirectional flow of electric charge you can count onWhat type of electric current flows in one direction?Discover the celestial equator, the imaginary line that divides the sky into north and southWhat is the imaginary line that circles the heavens midway between celestial poles called?Domain theory explains how a magnet's field comes from thousands of aligned magnetic domainsWhat theory states that the magnetic field of a magnet is the sum of thousands of magnetic domains?Drag in the air: why resistance matters for flight and fuel efficiencyIn what context is the term "drag" primarily used?Electrons: the key subatomic particle that shapes atoms and chemical reactionsWhich of the following subatomic particles is one of the components that make up atoms of matter?Electrostatics: the study of static electricity and its real-world usesWhich field of study focuses on the behavior and uses of static electricity?Energy is the ability to do work in physics—here's how it fits with force, distance, and powerWhat is defined as the ability to do work?Equinoxes: where the ecliptic crosses the celestial equator explained simplyWhat are the two points where the ecliptic crosses the celestial equator known as?Equus is a genus in biological classificationWhat classification does 'Equus' fall under?Escape velocity is the speed needed to break free from a body's gravityWhat characterizes escape velocity?Escape velocity: the speed needed to break free from Earth's gravityWhat term describes the speed needed to escape Earth's gravity?Escape velocity: the speed needed to break free from Earth's gravityWhich of these allows escape from Earth’s gravity?Escape velocity: why it stays the same for any object and how it changes with distance from a planetWhich of the following statements is true about escape velocity?Europa is an ice moon with a subsurface ocean that fuels curiosity about life beyond EarthWhat type of celestial body is Europa?Europa stands out as a moon with an ice-covered surface and a possible ocean beneathWhich of the following best describes Europa?How a barometer measures atmospheric pressure and why it matters for weatherWhat instrument is used to measure atmospheric pressure?How a carburetor uses the Bernoulli principle to mix air and fuel in enginesWhich device mixes air and fuel according to the Bernoulli principle?How a dipping needle reveals the Earth’s magnetic pole by measuring inclinationWhat device is used to indicate the north magnetic pole?How an electroscope detects electric charge and how it differs from other electrical instrumentsWhat device is used to detect and measure electric charge?How barbs and barbules keep feathers strong and waterproofWhat do barbs and barbules contribute to in feathers?How Bode's law estimates the distances of the first six planets from the SunWhat mathematical formula relates to the distances of the first six planets from the sun?How charging by induction works and why it causes charge redistribution in nearby conductorsWhat is the process by which an electrically charged object imparts a charge to another object?How does a calendar determine the beginning, length, and divisions of a year?What system is used to determine the beginning, length, and divisions of a year?How does increasing pressure affect a gas's volume according to Boyle's law?According to Boyle's law, what happens to the volume of a gas when its pressure increases?How down feathers help birds regulate body temperatureWhat kind of feather helps birds maintain their body temperature?How fast is a horse compared to other animals?How does the speed of a horse compare to that of other animals?How gas volume changes with pressure when temperature is constantWhat does Boyle's law state about gas volume and pressure?How the pharynx coordinates breathing and swallowing in the human bodyWhat is the Pharynx primarily responsible for?In astronomy, which object isn’t a celestial body: atom, star, planet, or comet?Which of the following is NOT considered a celestial body in the study of astronomy?Magnetic domains: understanding how aligned atoms share a single magnetic fieldWhat is a group of aligned atoms with a single magnetic field called?Mass is the property of matter measured in grams or kilogramsWhich characteristic of matter is measured in grams or kilograms?Meet Arcturus: the orange giant that shines at magnitude 0.00Which star is identified as an orange colored giant with an apparent magnitude of 0.00?Meet the deepest part of the ocean: Challenger Deep in the Mariana TrenchWhat is the name of the deepest known area of the ocean?The aorta as the body's largest artery and its role in circulationWhich of the following is a characteristic of the aorta?The asteroid belt: the rocky ring between Mars and JupiterWhat is the name of the region between Mars and Jupiter where most asteroids are found?The Moon blocks the Sun during a solar eclipse, and here’s whyWhich heavenly body blocks out the light of another during an eclipse?The Moon drives Earth's ocean tides more than any other celestial bodyWhat celestial body is responsible for influencing ocean tides on Earth?The pressure gradient and its role in predicting weather patternsWhat aspect of atmospheric pressure is crucial for weather prediction?Understanding absolute magnitude: how scientists compare the true brightness of starsWhat term describes the actual brightness of a star in relation to other stars?Understanding alternating current: how electric current changes direction and why it mattersWhat is the term for electric current that continually changes direction?Understanding attitudinal migration: why high-altitude birds descend to lower elevationsWhat phenomenon describes high-altitude birds migrating down to lower elevations?Understanding Bernoulli's principle: how faster moving fluids lower pressure and create liftWhat principle states that sideward pressure exerted by a moving fluid decreases as the fluid's velocity increases?Understanding binary stars: two stars that orbit each other explained with easy clarityWhat term describes two stars that orbit each other?Understanding convection: heat transfer through rising heated fluids and sinking cooler onesWhat is the transfer of heat that occurs by heated fluids rising and cooler fluids sinking?Understanding current electricity: what makes charges move and power our devicesWhat type of electricity is characterized by changes in motion?Understanding deceleration: what it means when an object slows downWhat term describes a decrease in the velocity of a moving object?Understanding Earth's escape velocity and why about 11.2 km/s is needed to leave gravityWhat is the approximate escape velocity from Earth's surface?Understanding evaporation: how liquids turn into vapor at any temperatureWhat is the effect called when a liquid changes into a vapor at any temperature?Understanding how electric current is measured and why some terms don’t fitWhich of the following is not considered a method of electric current measurement?Understanding how the aileron controls roll and how it differs from other wing surfacesWhat is the name of a movable control surface on the wing of an airplane?Understanding how the axis of rotation shapes day and night on EarthWhat is the significance of the 'axis of rotation' in geography?Understanding how we judge a star's brightness from Earth: apparent magnitude explainedHow is the brightness of a star as seen from Earth classified?Understanding the aorta: the main artery that leaves the heart powers systemic circulationWhat is the main artery that leaves the heart?Understanding the apparent solar day and how the sun's position shapes our time measurementsWhat term refers to the length of time it takes for the sun to cross the meridian twice?Understanding the axis of rotation: the imaginary line through Earth's centerWhat term describes the imaginary line that runs through the center of the Earth from the north pole to the south pole?Understanding the boiling point: how temperature turns a liquid into vaporWhat term describes the temperature at which a substance boils?Understanding the calorie: how much heat raises 1 gram of water by 1°C in thermodynamicsWhat is the quantity of heat required to raise the temperature of 1 gram of water by one degree Celsius?Understanding the core of a star: where fusion powers the glowWhat is the term for the central region of a star?Understanding the crescent phase: when less than half of the Moon’s lighted side is visibleWhat phase of a heavenly body has less than one half of its lighted portion visible?Understanding the dry cell: a voltaic cell with a paste electrolyteWhat is a voltaic cell in which the electrolyte is in the form of a paste called?Understanding the effort arm in a first-class leverWhat is the term for the length in a first-class lever where the effort force is applied?Understanding the electric circuit: a closed loop for current flowWhat is the term for a closed loop that includes a flow of electrons beginning at a source of current?Understanding the electric force: how charged objects attract or repelWhat is the term for the attraction between electrically charged objects that operates according to another object?Understanding the ellipse, the symmetrically shaped oval in geometryWhat is the term for a symmetrically shaped oval?Understanding the esophagus: its main job is to move food to the stomachWhat is the main function of the esophagus?Understanding the farthest point in a sun‑orbit and the terms that name itWhat is the term for the point in an object's orbit when it is farthest from the sun?Understanding the fifth brightest star in the night sky: Vega compared with Alpha Centauri and friendsWhich is the fifth brightest star in the night sky?Understanding the flow of electrons through a conductor and the idea of electric currentWhat is the term for the flow of electrons through a conductor?Understanding the gibbous moon phase: more than half illuminated but not fullWhich phase describes a lunar body that is more than half illuminated but not fully?Understanding the inverse relationship between pressure and volume in gases under constant temperature and amountWhich law states that if a gas is constant, then its volume and pressure are inversely related?Understanding the main use of a barometer in meteorologyWhat is the main use of a barometer in meteorology?Understanding the term for the force you apply to a simple machineWhat is the term for the force applied to a simple machine?Understanding what a barb is in a feather and how barbules work in feather structureWhat is a barb in the context of feathers?What a barbule is and how barbules interlock feather barbsWhich term refers to the tiny hooks along the edge of the contour feather that zips the barbs together?What a constellation is and how it differs from other star groupings you might hear aboutWhat is the name given to a group of stars often associated with mythical animals or figures?What amperage means in electricity and why it matters for current flowWhat does the term 'amperage' refer to in electricity?What an eclipsing binary is and how it reveals star sizes and massesWhat term refers to two stars orbiting each other where one regularly passes in front of the other?What apparent magnitude means in astronomy and how we see stars from EarthWhich of the following primarily defines 'apparent magnitude'?What are down feathers and how do they insulate birds?What term describes the soft fluffy bird feathers that provide insulation?What BTU stands for and why it matters in heating, cooling, and energyWhat does BTU stand for?What causes the colorful lights in the southern hemisphere?Which phenomenon is characterized by a colorful display of lights in the southern hemisphere?What DC stands for in electricity and why it matters in circuitsWhat does the abbreviation 'DC' stand for in electrical terms?What defines a supergiant star’s size during its lifecycle?What defines a supergiant star's size compared to its lifecycle stage?What defines current electricity and how the flow of charge powers circuitsWhat is the primary characteristic of current electricity?What describes an icy chunk of frozen gases, water, and dust in spaceWhat description fits an icy chunk of frozen gases, water, and dust?What do we call the negative electrode in a voltaic cell?What is the name of the negative electrode in a voltaic cell?What do you call a magnet that’s magnetized by an electric current?What is referred to as a temporary magnet that is magnetized by an electric current?What do you call an animal that primarily eats meat? Understanding carnivores and related dietary rolesWhat do you call an animal that primarily eats meat?What does an ammeter measure and how is it used in circuitsWhat is a common application of an ammeter?What does deceleration mean in physics and how is it different from accelerationIn physical science, what does the term 'deceleration' specifically refer to?What does the esophagus do in digestion and why is transport key?What crucial role does the esophagus play in digestion?What entropy means: the measure of disorder in a system and why it mattersWhat term describes the amount of disorder in a system?What exactly is an astronomical unit in miles and why it mattersApproximately how many miles does one astronomical unit represent?What force pulls an object inward toward the center of a curving path?What form of electrical current reverses direction periodically and why it mattersWhat is the form of electrical current that periodically reverses direction?What happens at absolute zero and why it means zero motion for moleculesWhat is the temperature at which molecules have no kinetic energy and therefore cease to move?What imaginary line encircles the Earth and how does it shape our globe?What imaginary line encircles the earth?What instrument measures height above sea level and how does it work?What instrument is used for measuring height above sea level?What is a block and tackle and how does it create mechanical advantage?What is a block and tackle?What is a coulomb? How this unit measures electric charge and why it mattersWhat unit is used to measure electrical charges?What is a large chunk of irregularly shaped space debris commonly called?What is an air capillary and how it functions in a bird’s lungsWhat term refers to one of many tiny tubes in the lungs of a bird?What is an eclipsing binary and why does its brightness change?What type of star is classified as an eclipsing binary?What is another name for a binary star, and why 'double star' fits bestWhat is another name for a binary star?What is attitudinal migration? Understanding short-distance altitude changes in animalsWhat is the term for migration that occurs over very short distances from a higher altitude to a lower?What is buoyant force and why it makes objects float in fluids?What is the upward force on an object in a fluid equal to the weight of the fluid displaced by that object called?What is condensation and how vapor turns into liquid in the water cycleWhat is the term used to describe the process in which vapor molecules become liquid?What is drag and how it slows down movement through air or waterWhat is the term for the resistance force exerted by a fluid that tends to slow down movement?What is one of Jupiter's four largest moons and what makes Europa stand out?Which of the following is one of Jupiter's four largest moons?What is the acceleration due to gravity near Earth’s surface?What is the acceleration of a freely falling body due to the attraction of gravity?What is the alula and how does it help birds fly at slow speeds?What is the name of the rectangular group of feathers on the front of a bird's wing that helps increase lift at slow speeds?What is the anode in electrochemistry and why does oxidation happen there?Which of the following best describes 'anode' in the context of electrochemistry?What is the apparent path of the sun in the sky called?What is the name given to the apparent path of the sun in the sky?What is the area around a charged object where electric force acts called?What is the area surrounding an electrically charged object that is affected by electric force called?What is the Atomic Theory of Matter and why it matters in chemistryWhat is the fundamental concept that states all matter consists of indivisible particles?What is the behavior called when birds rub ants on their feathers?What is the behavior of some birds that involves rubbing ants on their plumage called?What is the boiling point of water at sea level and why it matters in scienceIn a standard climate, what is the boiling point of water at sea level?What is the bowl-shaped cavity on a planet called and how does it form?What is the term for a bowl-shaped cavity on a planet?What is the cathode in a voltaic cell and why it mattersWhat is the term for the positive electrode in a voltaic cell?What is the celestial sphere and why does it encircle the Earth?What is described as an imaginary dome that encircles the Earth?What is the colorful natural light display in the northern hemisphere called and why does it happen?What do we call the colorful natural light display in the northern hemisphere?What is the coma in a comet and why does it form when it nears the Sun?What is the term for the hazy cloud of dust surrounding the nucleus of a comet?What is the condensation point and why does it matter in meteorology?Which term refers to the point at which condensation occurs?What is the conducting fluid in an electrochemical cell called and why does it matter?What is an electrically conducting fluid that reacts with the electrodes of an electrochemical cell called?What is the difference between mean solar time and apparent solar time called?What is the length of the path over which an object travels in physics?What is defined as the length of the path over which an object travels?What is the main focus of astrology and how it relates to human affairsWhat is the primary focus of the science of astrology?What is the most basic unit of time and how is it defined?What is the most basic unit of time?What is the name of the dipper-shaped group of stars in Ursa Major, and why does it matter?What is the name of the dipper-shaped group of stars located in the constellation Ursa Major?What is the outermost part of the Sun’s surface and why it mattersWhat is the name of the outermost part of the sun's surface?What is the process called when gas becomes a liquid?What is the process called where gas transitions directly to a liquid state?What is the scientific name of a horse and what it tells us about taxonomyWhat is the scientific name of a horse?What is the smallest particle that retains an element's characteristics?What is the smallest particle of an element that retains the characteristics of that element?What is the term for the attraction that makes different kinds of matter stick together?What term describes the attraction that allows molecules of different kinds of matter to stick together?What is the tube that carries food from the throat to the stomach called?What is the name of the tube through which food passes from the throat to the stomach?What is the unit of electric current and why it’s the ampereWhat is the unit of electric current?What layer of the sun’s atmosphere gives it its color and why?What term refers to the layer of the sun's atmosphere that gives it color?What makes a circuit closed and why current can flow in a loopWhich type of circuit allows electric waves to follow a closed loop?What makes alkaline batteries an improved form of the dry cell?What type of battery is an improved form of dry cell using an alkaline base as its electrolyte?What makes Earth the only known planet that can sustain life in our solar systemWhat is the third planet from the sun, known to be the only planet suitable for life?What property lets subatomic particles attract or repel each other? Electric charge and the electromagnetic force explainedWhat property of certain subatomic particles allows them to attract or repel each other?What term describes the misconception that nonliving things can produce living things?What the AU means in astronomy and why it mattersWhat does the abbreviation 'AU' stand for in astronomical terms?What the British Thermal Unit measures and why it matters in heating and coolingWhat is the British Thermal Unit (BTU) a measure of?What type of electric current flows in one consistent direction? A straightforward look at direct currentWhat type of electric current flows in one consistent direction?What’s the big deal with binocular vision and depth perception?What is the primary benefit of binocular vision?When multiple electrochemical cells are connected, a battery forms and boosts voltage or capacityWhat is created when multiple electrochemical cells are connected together?Which constellation contains Sirius and what makes it special?Which constellation contains the star Sirius?Which constellation contains the star Deneb and what makes it stand out in the night sky?What constellation contains the star Deneb?Which constellation houses Thuban and why it mattered to ancient navigatorsWhich constellation contains the star Thuban?Which constellation looks like a giant whale and why Cetus stands outWhich constellation is shaped like a huge whale?Which galaxy is the largest in our local group and about 2 million light-years away?Which galaxy is known as the largest in our local group and is approximately 2 million light years away?Which of Mars' two moons is Deimos, and what makes Phobos and Deimos unique?Which of the following is one of Mars' two moons?Which organ serves as a single entry point for materials from the digestive, excretory, and reproductive systems?What is the common organ that receives materials from digestive, excretory, and reproductive systems?Which part of an electrochemical cell produces electric charge and why electrodes are keyWhich part of an electrochemical cell is responsible for producing electric charge?Which star is known as Beta Centauri in Centaurus?Which star is known as Beta Centauri in the constellation Centaurus?Which star is part of the Centauri triple star system and what does Alpha Centauri actually refer to?Which star is part of the Centauri triple star system?Which temperature scale marks the freezing point of water at 0 degrees?What temperature scale represents freezing point at 0 degrees?Why 'day' is the right unit to describe a full 24-hour cycleWhat unit would be used to describe one full day?Why an airfoil is designed to produce lift in a moving fluid using Bernoulli principlesWhich object is shaped to produce lift by the Bernoulli principle when in a moving fluid?Why are most asteroids irregularly shaped and not round?What is the typical shape of an asteroid?Why Charon is Pluto’s binary companion and what that means for the solar systemWhich moon is known to be the binary star of Pluto?Why DDT was banned in the United States and what it teaches about pesticide policyWhich pesticide was once widely used but is now banned in the United States?Why do objects float in fluids? A clear look at Archimedes' principle and buoyancyWhat principle of physics explains why objects float in fluids?Why Do Objects Float? A Simple Look at Buoyancy and Floating in FluidsWhat is the term for the tendency of an object to float when placed in a fluid?Why does a black hole trap light while other stars don’t? A quick look at extreme gravity and the event horizonWhich object has gravity strong enough that light cannot escape its surface?Why insulators resist heat transfer and how they differ from conductors, thermal mass, and superconductorsWhich type of material is generally ineffective at transferring heat?Why meteor showers happen: Earth crossing comet debris creates bright meteor streaksWhich celestial phenomenon is primarily responsible for meteor showers when Earth passes through their debris?Why Pollux is brighter than Castor in the Gemini constellationWhat is the name of the second brightest star in the constellation Gemini?Why the ammeter is the device used to measure amperage in electrical circuitsWhat is the device called that is specifically designed to measure amperage?Why the covering of a celestial light is called an eclipse and how it worksWhat is the covering or obscuring of the light of one heavenly body called?Why the paste electrolyte is the defining trait of a dry cellWhat is the primary characteristic of a dry cell compared to other types of cells?

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