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OpenStem
@openstem · Joined Jul 2026
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Quiz6 questions
What does a sensor do?
AIt always turns a motor onBIt detects something in the environment and turns it into informationCIt stores electricity for later useDIt only works when a person presses a button
Engineering · L2 · Sensors & Feedback Quiz
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Engineering · L2 · Sensors & Feedback QuizQuiz6 questions
What actually pushes water through a pipe from one end to the other?
AA difference in pressureBThe color of the pipeCThe water's own memory of where it came fromDNothing — water moves through pipes on its own with no cause
Engineering · L2 · Pressure & Fluids in Pipes Quiz
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Engineering · L2 · Pressure & Fluids in Pipes QuizQuiz6 questions
Which way does heat naturally flow between two places at different temperatures?
AFrom cooler to warmerBFrom warmer to coolerCIt does not move at allDRandomly, in both directions equally
Engineering · L2 · Heat Transfer & Insulation Quiz
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Engineering · L2 · Heat Transfer & Insulation QuizQuiz6 questions
Why do engineers draw a plan before they build something?
ATo make the drawing look niceBTo agree on the exact size and shape before it costs time and materialsCBecause building without a plan is against the lawDTo avoid using any measurements
Engineering · L2 · Engineering Drawing & Scale Quiz
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Engineering · L2 · Engineering Drawing & Scale QuizQuiz6 questions
In injection molding, what happens to the plastic before it enters the mold?
AIt is frozen solidBIt is melted into a liquidCIt is dissolved in waterDIt is left as solid pellets
Engineering · L2 · How Things Are Made Quiz
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Engineering · L2 · How Things Are Made QuizQuiz6 questions
How is a gear ratio calculated?
ADriving teeth ÷ driven teethBDriven teeth ÷ driving teethCDriving teeth + driven teethDDriven teeth − driving teeth
Engineering · L2 · Gear Ratios Quiz
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Engineering · L2 · Gear Ratios QuizQuiz6 questions
In a Class 1 lever, what sits between the effort and the load?
AThe fulcrumBNothing — they touch directlyCA second loadDA second fulcrum
Engineering · L2 · Levers: Three Classes Quiz
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Engineering · L2 · Levers: Three Classes QuizQuiz6 questions
An arch carries most of its load through which kind of force?
ATension (stretching)BCompression (squeezing)CFriction onlyDMagnetism
Engineering · L2 · Arches & Domes Quiz
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Engineering · L2 · Arches & Domes QuizQuiz6 questions
Two 1.5V batteries are connected in series. What is the total voltage?
A1.5VB3VC0.75VD4.5V
Engineering · L2 · Batteries in Series vs Parallel Quiz
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Engineering · L2 · Batteries in Series vs Parallel QuizQuiz6 questions
Which three parts combine to make a simple robot?
AA battery, a screen, and a speakerBSensors, a simple program, and motorsCWheels, paint, and a name tagDA remote control and nothing else
Engineering · L2 · Simple Robots & Motors Quiz
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Engineering · L2 · Simple Robots & Motors QuizQuiz6 questions
When honey, dish soap, water, and oil are poured into the same glass, what determines which one ends up on top?
AWhich liquid was poured in firstBThe liquid with the lowest density floats to the topCThe color of the liquidDWhichever liquid is coldest
Engineering · L2 · Density Layers in Liquids Quiz
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Engineering · L2 · Density Layers in Liquids QuizQuiz6 questions
What does it mean for an energy source to be 'renewable'?
AIt is the cheapest kind of energyBIt naturally replenishes and does not run outCIt can only be used onceDIt only works at night
Engineering · L2 · Renewable Energy Quiz
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Engineering · L2 · Renewable Energy QuizQuiz6 questions
What are the four main stages of a material's life cycle?
AMining, selling, shipping, storingBRaw material, manufacture, use, end of lifeCDesign, testing, marketing, salesDMelting, cooling, cutting, painting
Engineering · L2 · Recycling & Material Life Cycles Quiz
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Engineering · L2 · Recycling & Material Life Cycles QuizQuiz6 questions
Which discipline designs machines with moving parts, like engines and gears?
ACivilBMechanicalCChemicalDElectrical
Engineering · L2 · Engineering Disciplines Quiz
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Engineering · L2 · Engineering Disciplines QuizQuiz6 questions
What is the mechanical advantage of a single fixed pulley?
A1B2CIt has no mechanical advantage at allDIt depends on the size of the wheel
Engineering · L2 · Pulleys & Mechanical Advantage Quiz
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Engineering · L2 · Pulleys & Mechanical Advantage QuizQuiz6 questions
You need to get a heavy box sliding across the floor. Once it's moving, does it take more, less, or the same force to keep it sliding at a steady speed?
AMore force than starting itBLess force than starting itCThe exact same forceDNo force at all
Engineering · L2 · Friction in Design Quiz
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Engineering · L2 · Friction in Design QuizQuiz6 questions
What component does a zigzag line represent in a circuit diagram?
AA batteryBA resistorCA switchDA bulb
Engineering · L2 · Reading Circuit Diagrams Quiz
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Engineering · L2 · Reading Circuit Diagrams QuizQuiz6 questions
What creates a magnetic field around a wire?
AElectric current flowing through itBSunlight shining on itCHeating the wire with a flameDPainting the wire a different color
Engineering · L2 · Electromagnets Quiz
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Engineering · L2 · Electromagnets QuizQuiz6 questions
Which heat transfer method moves heat through direct contact, mostly in solids?
AConductionBConvectionCRadiationDInsulation
Engineering · L2 · How Heat Travels Quiz
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Engineering · L2 · How Heat Travels QuizQuiz6 questions
What does Pascal's principle say about pressure applied to a liquid trapped in a sealed system?
AIt only pushes in the direction it was appliedBIt transmits equally in every direction through the liquidCIt gets weaker the farther it travels through the liquidDIt only affects the piston nearest the push
Engineering · L2 · Hydraulics Quiz
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Engineering · L2 · Hydraulics QuizQuiz6 questions
What is the main purpose of investigating an engineering failure?
ATo assign blame to a single worker as quickly as possibleBTo find the root cause and change designs or rules so it can't happen againCTo hide the details of what happened from the publicDTo rebuild the exact same structure without any changes
Engineering · L2 · Learning From Failures Quiz
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Engineering · L2 · Learning From Failures QuizQuiz6 questions
What does it mean for a screw to be a "standard" size?
AIt is the cheapest screw availableBIts dimensions match an agreed rulebook that every manufacturer builds toCIt was designed by a single famous engineerDIt can only be used once
Engineering · L2 · Standards & Codes Quiz
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Engineering · L2 · Standards & Codes QuizQuiz6 questions
What makes a structure a cantilever?
AIt's supported at both endsBIt's fixed at only one end, with the other end freeCIt forms a closed triangular shapeDIt's curved and pushes its load outward into two feet
Engineering · L2 · Cantilevers Quiz
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Engineering · L2 · Cantilevers QuizQuiz6 questions
What does a capacitor do?
AStores electrical charge and can release it very quicklyBConverts electricity directly into lightCGenerates its own electricity, like a battery cellDSlows down the flow of electricity permanently
Engineering · L2 · What Does a Capacitor Do? Quiz
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Engineering · L2 · What Does a Capacitor Do? QuizQuiz6 questions
Why does an evaporating liquid cool down the surface it was sitting on?
AEvaporation pulls heat energy from the surface to power the change from liquid to gasBThe liquid reflects sunlight away from the surfaceCGas particles are naturally colder than liquid particlesDEvaporation adds extra water molecules that block heat
Engineering · L2 · Evaporative Cooling Quiz
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Engineering · L2 · Evaporative Cooling QuizQuiz6 questions
Why do engineers filter water through several different layers instead of just one?
ADifferent layers catch different sizes and types of contaminants — no single material catches everythingBExtra layers make the water flow faster through the filterCOne layer would make the water taste too cleanDFilters need to be a certain height to fit standard housings
Engineering · L2 · How Water Filtration Works Quiz
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Engineering · L2 · How Water Filtration Works QuizQuiz6 questions
What is a "requirement" in engineering design?
AA guess about what the finished design might look likeBA specific, written statement of something the finished design must doCThe final price of the finished productDA drawing made after the design is finished
Engineering · L2 · Requirements Gathering Quiz
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Engineering · L2 · Requirements Gathering QuizQuiz6 questions
Which prototyping method usually takes the least time and money to build?
AA paper or cardboard mockupBA 3D-printed prototypeCA CNC-machined prototypeDAll three cost and take about the same
Engineering · L2 · Comparing Prototyping Methods Quiz
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Engineering · L2 · Comparing Prototyping Methods QuizQuiz6 questions
How is the bending moment at a point on a beam calculated?
AForce divided by distanceBForce multiplied by the perpendicular distance from that pointCForce multiplied by the beam's total lengthDForce squared
Engineering · L3 · Beam Bending & Moment of Inertia
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Engineering · L3 · Beam Bending & Moment of InertiaQuiz6 questions
In the method of joints, why does a single joint only give two independent equilibrium equations?
ABecause trusses only ever have two membersBBecause a joint is a point, so it only balances forces in two directions (x and y) — there is no rotation equation at a pointCBecause engineers only care about vertical forcesDBecause every truss member is exactly the same length
Engineering · L3 · Method of Joints Quiz
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Engineering · L3 · Method of Joints Quiz