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OpenStem
@openstem · Joined Jul 2026
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Quiz6 questions
Which of these best defines the wavelength of a wave?
AThe time for one complete cycle to pass a pointBThe distance between two corresponding points on consecutive cycles, e.g. crest to crestCThe maximum displacement of a particle from its rest positionDThe number of cycles passing a point each second
Physics · L3 · Wave Properties: Wavelength, Frequency, and Speed
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Physics · L3 · Wave Properties: Wavelength, Frequency, and SpeedQuiz6 questions
Two resistors, 5 Ω and 15 Ω, are connected in series across a battery. What is the total resistance?
A20 ΩB10 ΩC3 ΩD75 Ω
Physics · L3 · Resistor Circuits
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Physics · L3 · Resistor CircuitsQuiz6 questions
The law of reflection states that the angle of incidence equals the angle of reflection, both measured from...
Athe surface itselfBthe normal, a line perpendicular to the surfaceCthe horizonDthe direction of travel of the incoming ray
Physics · L3 · Reflection, Refraction & Snell's Law
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Physics · L3 · Reflection, Refraction & Snell's LawQuiz6 questions
A ball launches at 10 m/s at 90° above horizontal (straight up). Why can't the range formula R = v₀²sin(2θ)/g be applied meaningfully here in the usual sense?
AIt can — the formula gives R = 0, which matches the ball landing back where it launchedBThe formula only works for negative anglesCg would need to be zeroDThe ball never comes back down
Physics · L3 · Projectile Motion
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Physics · L3 · Projectile MotionQuiz6 questions
What does torque measure?
AHow fast an object moves in a straight lineBHow much a force rotates an object around a pivot pointCThe total energy stored in a spinning objectDThe friction between two surfaces
Physics · L3 · Torque & Rotational Equilibrium
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Physics · L3 · Torque & Rotational EquilibriumQuiz6 questions
Which formula gives the period of a simple pendulum undergoing small-angle swings?
AT = 2π√(m/k)BT = 2π√(L/g)CT = 2πL/gDT = L/g
Physics · L3 · Simple Harmonic Motion: Springs & Pendulums
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Physics · L3 · Simple Harmonic Motion: Springs & PendulumsQuiz6 questions
What does Coulomb's law describe?
AThe force of gravity between two massesBThe force between two electric chargesCThe speed of an electron in orbitDThe energy stored in a capacitor
Physics · L3 · Electric Fields & Coulomb's Law
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Physics · L3 · Electric Fields & Coulomb's LawQuiz6 questions
A charged particle is held stationary inside a strong magnetic field. What magnetic force does it feel?
AA force equal to qBBA force equal to qvBCZero — magnetic force requires motionDIt depends on the particle's mass
Physics · L3 · Magnetic Force on Moving Charges
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Physics · L3 · Magnetic Force on Moving ChargesQuiz6 questions
In the formula q = mcΔT, what does c represent?
AThe total heat energy transferredBThe mass of the substanceCThe specific heat capacity — a property of the materialDThe change in temperature
Physics · L3 · Specific Heat & Calorimetry
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Physics · L3 · Specific Heat & CalorimetryQuiz6 questions
A converging (convex) lens is thicker in the middle than at the edges. What happens to parallel light rays after passing through it?
AThey spread apart, appearing to come from a point on the same sideBThey converge, meeting at the focal point on the far side of the lensCThey reflect straight back the way they cameDThey pass straight through completely unchanged
Physics · L3 · Lenses & Optical Instruments
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Physics · L3 · Lenses & Optical InstrumentsQuiz6 questions
A firetruck's siren sounds while the truck drives toward a pedestrian on the sidewalk. Compared to the siren's true emitted frequency, what pitch does the pedestrian hear?
AA higher pitchBA lower pitchCThe exact same pitch, just louderDNo sound until the truck passes
Physics · L3 · The Doppler Effect
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Physics · L3 · The Doppler EffectQuiz6 questions
Newton's Third Law states that action-reaction force pairs always act on...
AThe same objectBTwo different objectsCOnly objects that are touchingDOnly massive objects like planets
Physics · L3 · Newton's Third Law
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Physics · L3 · Newton's Third LawQuiz6 questions
In the SUVAT equations, what does the letter "u" represent?
AFinal velocityBInitial velocityCDisplacementDTime
Physics · L3 · 1D Kinematics: The SUVAT Equations
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Physics · L3 · 1D Kinematics: The SUVAT EquationsQuiz6 questions
What is electric potential (voltage) most precisely defined as?
AThe total charge on an objectBElectric potential energy per unit of chargeCThe current flowing through a wireDThe resistance of a circuit
Physics · L3 · Electric Potential & Capacitors
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Physics · L3 · Electric Potential & CapacitorsQuiz6 questions
In F = BIL sin θ, what does θ represent?
AThe temperature of the wireBThe angle between the wire and the magnetic fieldCThe resistance of the wireDThe angle of the wire above the ground
Physics · L3 · Magnetic Force on Current-Carrying Wires
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Physics · L3 · Magnetic Force on Current-Carrying WiresQuiz6 questions
What does the First Law of Thermodynamics state?
AHeat always flows from cold to hotBEnergy cannot be created or destroyed, only converted or transferredCEntropy always decreases over timeDAll engines are 100% efficient
Physics · L3 · The Laws of Thermodynamics & Heat Engines
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Physics · L3 · The Laws of Thermodynamics & Heat EnginesQuiz6 questions
According to the continuity equation, what happens to a fluid's speed when a pipe narrows?
AThe speed decreasesBThe speed increasesCThe speed stays exactly the sameDThe fluid stops flowing entirely
Physics · L3 · Fluid Dynamics: Continuity & Bernoulli's Principle
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Physics · L3 · Fluid Dynamics: Continuity & Bernoulli's PrincipleQuiz6 questions
What is required to induce a current in a loop of wire?
AAny magnetic field nearby, moving or notBA changing magnetic flux through the loopCA battery connected directly to the loopDThe loop must be made of a magnetic material
Physics · L3 · Electromagnetic Induction: Faraday's & Lenz's Laws
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Physics · L3 · Electromagnetic Induction: Faraday's & Lenz's LawsQuiz6 questions
What is a node in a standing wave?
AA point that oscillates with maximum amplitudeBA point that never movesCThe highest point of the waveDThe point where the wave was first created
Physics · L3 · Standing Waves & Resonance
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Physics · L3 · Standing Waves & ResonanceQuiz6 questions
This distance-time graph is a straight line through the origin. What does its gradient tell you, and what does the straightness tell you?
AThe gradient is the acceleration, and the straight line means the acceleration is increasingBThe gradient is the speed, and the straight line means the speed is constantCThe gradient is the total distance, and the straight line means the object is stationaryDThe gradient is the time taken, and the straight line means the object is speeding up
Physics · L3 · Reading Graphs — 6 Q
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Physics · L3 · Reading Graphs — 6 QQuiz10 questions
The speed of sound doubles. If the frequency stays the same, what happens to the wavelength?
AIt halvesBIt stays the sameCIt doublesDIt quadruples
Physics · L4 · Waves & Optics — 10 Q
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Physics · L4 · Waves & Optics — 10 QQuiz10 questions
A car accelerates from 0 to 30 m/s in 10 s at constant acceleration. What is its acceleration?
A0.3 m/s²B3 m/s²C300 m/s²D30 m/s²
Physics · L4 · Classical Mechanics — 10 Q
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Physics · L4 · Classical Mechanics — 10 QQuiz10 questions
Two charges of +2 μC and +3 μC are 0.1 m apart. Is the force attractive or repulsive?
AAttractiveBRepulsiveCZeroDDepends on orientation
Physics · L4 · Electromagnetism — 10 Q
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Physics · L4 · Electromagnetism — 10 QQuiz10 questions
What does the first law of thermodynamics state?
AEntropy of an isolated system always increasesBEnergy of the universe is constant; ΔU = Q − WCHeat flows from cold to hot spontaneouslyDAbsolute zero is unattainable
Physics · L4 · Thermodynamics — 10 Q
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Physics · L4 · Thermodynamics — 10 QQuiz8 questions
A force is applied directly toward a hinge (along the line connecting the force's application point to the hinge). What torque does it produce about the hinge?
AMaximum torqueBZero torqueCTorque equal to the force magnitudeDTorque depends on the object's mass
Physics · L4 · Rotational Dynamics, Torque & Angular Momentum
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Physics · L4 · Rotational Dynamics, Torque & Angular MomentumQuiz8 questions
Water flows through a pipe that narrows from 6 cm² to 3 cm². If the initial speed is 2 m/s, what is the speed in the narrow section?
A1 m/sB2 m/sC4 m/sD8 m/s
Physics · L4 · Fluid Mechanics — 8 Q
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Physics · L4 · Fluid Mechanics — 8 QQuiz8 questions
In x(t) = A·cos(ωt + φ), what does φ represent?
AThe amplitude of oscillationBA phase constant set by initial position and velocityCThe damping coefficientDThe period of oscillation
Physics · L4 · Oscillations & Resonance
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Physics · L4 · Oscillations & ResonanceQuiz8 questions
According to Faraday's law, what actually induces an EMF in a loop?
AA strong magnetic field, regardless of whether it changesBA changing magnetic flux through the loopCAny current flowing nearby, changing or notDThe loop's resistance alone
Physics · L4 · Electromagnetic Induction
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Physics · L4 · Electromagnetic InductionQuiz7 questions
As the frequency of an AC source approaches zero (DC), what happens to a capacitor's reactance X_C?
AIt approaches zeroBIt stays constantCIt approaches infinityDIt becomes negative
Physics · L4 · AC Circuits — 7 Q
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Physics · L4 · AC Circuits — 7 QQuiz7 questions
A converging lens has f = 15 cm. An object is placed 45 cm from the lens. Find the image distance.
Ad_i = 11.25 cmBd_i = 22.5 cmCd_i = 30 cmDd_i = 60 cm
Physics · L4 · Geometric Optics — 7 Q
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Physics · L4 · Geometric Optics — 7 Q