Gifu Entrance Science common mistakes
Gifu Entrance Science · Understand the traps and how to avoid them.
When a problem gives a velocity-time graph or a set of position-time data, the candidate reads the slope as acceleration or reads the area under the curve as distance without checking which quantity is on each axis, and reports a value with the wrong unit (e.g., m/s instead of m/s²).
The slope/area rules are memorised as slogans ("slope = speed") rather than derived from the axis labels, so under time pressure the candidate pattern-matches the shape of the graph instead of the units. Japanese entrance papers often switch axis quantities between sub-questions to test exactly this.
What to do instead
Before computing anything, write the axis units as a fraction (vertical unit / horizontal unit) next to the graph and state in one line what that fraction represents. For area, multiply the two axis units. Then check the final unit against the quantity asked for; if they disagree, stop and re-read the axes.
On two-body or connected-object problems (blocks on a table joined by a string over a pulley, or a person in an elevator), the candidate applies Newton's second law separately to each body using the same acceleration sign convention and gets contradictory equations, or forgets that tension/internal forces cancel when treating the system as a whole.
The candidate treats F = ma as a formula to substitute into rather than a vector statement about one chosen body. Sign errors arise because the direction of positive acceleration is never fixed before writing equations.
What to do instead
Draw a free-body diagram for each body separately, mark the chosen positive direction on the diagram, and write ΣF = ma for each body with signs taken from that diagram. Then add the equations to eliminate internal forces and check that the result reduces to the whole-system equation F_external = (total mass)a.
In conservation-of-momentum and energy problems the candidate mixes up elastic and inelastic collisions, using ½mv² conservation in a collision where the objects stick together, or forgetting that kinetic energy is lost to heat/deformation in a perfectly inelastic collision.
Both conservation laws look like the same 'set initial = final' template, so the candidate applies whichever was used most recently without asking whether mechanical energy is actually conserved.
What to do instead
Before writing equations, classify the interaction: is momentum conserved (no external force) and is kinetic energy conserved (only if explicitly elastic)? For 'stick together' problems, use momentum only, then compute the energy loss separately as a check. State the classification in one sentence at the top of the solution.
For wave problems the candidate confuses wave speed with particle/oscillation speed, or applies v = fλ to a standing wave without recognising that adjacent nodes are half a wavelength apart and that the fundamental frequency depends on boundary conditions (fixed-fixed vs fixed-open).
v = fλ is over-learned as a universal plug-in, and the candidate does not connect the physical picture (nodes, antinodes, string length) to the wavelength before substituting.
What to do instead
Always sketch the standing-wave pattern first, count how many half-wavelengths fit in the given length, and only then use v = fλ. Keep a one-line distinction in notes: wave speed = how fast the pattern travels; particle speed = maximum at antinodes, zero at nodes.
In DC circuit problems the candidate adds resistors in parallel by simply summing them, or ignores internal resistance of a battery, or applies the junction/loop rules without assigning current directions first, producing sign errors in Kirchhoff equations.
Series and parallel formulas are recalled as bare reciprocals without the underlying idea that parallel branches share the same voltage, and Kirchhoff's laws are applied mechanically without a labelled circuit diagram.
What to do instead
Redraw the circuit with every current arrow and node labelled before writing equations. Check parallel combinations with the rule 'equivalent resistance must be smaller than the smallest branch'. For internal resistance, always write EMF = I(R + r) and keep r in the loop equation.
On thermodynamics questions the candidate uses Q = mcΔT and then forgets to add the latent heat term when a phase change occurs within the temperature range, or applies the ideal gas law with Celsius temperatures instead of kelvin.
Heat problems are treated as a single formula lookup; the candidate does not break the process into segments (warming ice → melting → warming water) and does not check temperature units against the gas constant used.
What to do instead
For any calorimetry problem, draw a temperature-vs-heat line and mark each segment; add mcΔT for each warming segment plus mL for each flat segment. For gas laws, convert to kelvin first and write the unit of R next to the value you use.
When asked to explain a bonding or property trend (why NaCl has a high melting point, why HF boils higher than HCl), the candidate answers 'because of strong bonds' without specifying which interaction (ionic lattice, hydrogen bonding, van der Waals) and without distinguishing intramolecular bonds from intermolecular forces.
The candidate memorises property facts separately from the structural model, so the explanation defaults to a vague phrase that would score zero on a written-response item.
What to do instead
Answer in a fixed three-part template: (1) name the particles present, (2) name the force between them, (3) state what must be overcome to melt/boil. Practise classifying every substance into ionic / covalent molecular / covalent network / metallic before writing the explanation.
In equilibrium problems the candidate writes the equilibrium constant expression with the wrong powers (including stoichiometric coefficients as multipliers rather than exponents) or treats a catalyst or a pressure change as shifting the position of equilibrium.
Le Chatelier's principle and the K expression are learned as separate lists of rules, so the candidate does not connect K to the balanced equation and misattributes rate effects to equilibrium effects.
What to do instead
Always write the balanced equation first, then build K with products over reactants, each raised to its coefficient. Keep a two-column note: 'changes rate only' (catalyst, surface area) vs 'changes equilibrium position' (concentration, temperature, pressure for gases). Remember K itself changes only with temperature.
In genetics problems the candidate works a dihybrid or pedigree cross without first writing the parental genotypes and the gametes each can produce, then mis-assigns phenotypes, or forgets that a test cross uses a homozygous recessive partner.
Punnett squares are drawn mechanically with letters but the candidate never translates the phenotype description into a genotype, so the letters carry no meaning and ratios are guessed.
What to do instead
Before drawing anything, write 'phenotype → genotype' for each individual, list the gametes, and only then fill the grid. For pedigrees, mark affected individuals and test each inheritance mode (autosomal dominant/recessive, X-linked) against the data, eliminating modes that contradict it.
On homeostasis and ecology items the candidate describes a feedback loop in one direction only (e.g., 'insulin lowers blood glucose') without stating the sensor, the response, and the negative-feedback correction, or confuses energy flow with nutrient cycling in an ecosystem diagram.
These topics are revised as vocabulary lists, so the candidate reproduces a term without the causal chain the question is testing, and energy/nutrient diagrams look similar enough to be conflated.
What to do instead
Write every feedback answer as a chain: stimulus → receptor → control centre → effector → response → return toward set point. For ecosystems, keep the distinction explicit: energy flows one way and is lost as heat at each trophic level; matter cycles. Practise drawing both arrows on the same diagram.
On Earth Science items the candidate explains seasons by Earth's distance from the Sun, or reads a weather map by treating the isobars as showing wind direction rather than pressure gradient, or confuses the order of geological strata with absolute age.
Everyday language ('summer is when we are closer to the Sun') overrides the taught model, and map-reading skills are practised less than definitions, so the candidate falls back on intuition.
What to do instead
Anchor each with a corrective one-liner: seasons are caused by axial tilt changing the angle and duration of sunlight, not distance; wind blows from high to low pressure roughly along the pressure gradient, deflected by Coriolis. For strata, apply superposition and cross-cutting relationships in order before assigning relative ages.
In data-analysis questions the candidate reports a calculated value to more significant figures than the raw data support, ignores units on a gradient, or concludes 'the hypothesis is proven' from a single trial without considering control variables or repeat measurements.
The candidate treats data analysis as arithmetic practice and has not internalised that precision, units, and experimental design are part of the answer being marked. Japanese entrance papers frequently award marks for stating the control and the reason for repeats.
What to do instead
Apply a fixed checklist to every data question: (1) identify independent, dependent, and controlled variables; (2) state the number of significant figures justified by the least precise input; (3) give the gradient's unit; (4) phrase conclusions as 'supports/does not support' and name one improvement (repeat trials, wider range, control a named variable).