This student-facing guide offers elite, evidence-based exam tips and strategies for Cambridge IGCSE Physics (0625). It breaks down the exam structure (Papers 2, 4, and 6), analyzes high-frequency pitfalls based on examiner reports from 2023-2025, and provides legal calculator shortcuts and revision hacks to secure top marks.
อ่าน 5 นาทีอัปเดตเมื่อ: 21 มิ.ย. 2569
ภาพรวมข้อสอบ
จำนวนฉบับ
3
คะแนนเต็ม
160
เวลาสอบ
3ชม.
ประเภทคำถาม
3
ฉบับ
เวลา
คะแนน
จำนวนข้อ
น้ำหนักคะแนน
ประเภทคำถาม
Paper 2: Multiple Choice (Extended)
45นาที
40
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—
—
Paper 4: Theory (Extended)
1ชม. 15นาที
80
—
—
—
Paper 6: Alternative to Practical
1ชม.
40
—
—
—
เกณฑ์เกรด
A*ABCDEFGU
ข้อกำหนดเครื่องคิดเลข
A silent scientific calculator may be used on papers where calculators are permitted (some papers are non-calculator). It must not be graphical or programmable and must hold no stored information.
AO1: Knowledge with understanding (50%)
AO2: Handling information and problem-solving (30%)
วัตถุประสงค์: Tabulate \(y\) across a range of \(x\) to locate sign changes (roots) and approximate maxima/minima.
ใช้เมื่อใด: Solving or sketching a function when you want to find where its graph crosses or turns.
ขั้นตอน
Enter the function in TABLE mode, set the start, end and step, then read where the sign of \(y\) changes or where it peaks.
ข้อควรระวังในการสอบ: Allowed on papers where a calculator is permitted; use a silent scientific calculator with no stored content and show your method.
Statistics mode (mean, SD & regression)
Scientific calculator (e.g. Casio fx-991 series)
วัตถุประสงค์: Read the mean \(\bar{x}\) and standard deviation directly, and the gradient/intercept (and \(r\)) of a linear regression for bivariate data.
ใช้เมื่อใด: Any data-handling, statistics, or required-practical analysis question.
ขั้นตอน
Enter the data in STAT mode (1-VAR or A+BX), then recall \(\bar{x}\), \(\sigma\) or the regression coefficients.
ข้อควรระวังในการสอบ: Allowed on papers where a calculator is permitted; use a silent scientific calculator with no stored content and show your method.
Carry exact values with Ans & memory
Scientific calculator (e.g. Casio fx-991 series)
วัตถุประสงค์: Keep full-precision intermediate values to avoid rounding errors.
ใช้เมื่อใด: Multi-step calculations where premature rounding loses the final accuracy mark.
ขั้นตอน
Use Ans, STO/RCL or the M+ memory to reuse the unrounded result of each step; round only the final answer.
ข้อควรระวังในการสอบ: Allowed on papers where a calculator is permitted; use a silent scientific calculator with no stored content and show your method.
Equation solver — to CHECK your working
Scientific calculator (e.g. Casio fx-991 series)
วัตถุประสงค์: Use the built-in EQN/SOLVE mode to verify roots of quadratics or simultaneous equations you have already solved by algebra.
ใช้เมื่อใด: As a check only, after solving by hand.
ขั้นตอน
Enter the coefficients in EQN mode (or use SOLVE) and confirm they match your worked solution.
ข้อควรระวังในการสอบ: Allowed on papers where a calculator is permitted; use a silent scientific calculator with no stored content and show your method.
ข้อผิดพลาดที่พบบ่อย
1highคะแนนที่เกี่ยวข้อง: 1Physical quantities and measurement techniques
Substituting numerical values in 'show that' calculation questions without first stating the starting algebraic equation in symbols.
วิธีหลีกเลี่ยง: Always write down the general formula in algebraic symbols (e.g., P = E / t) on the very first line before substituting any numbers.
2highคะแนนที่เกี่ยวข้อง: 1Mass and weight
Using g = 10 N/kg or g = 9.81 m/s^2 instead of the syllabus-mandated value.
วิธีหลีกเลี่ยง: Use exactly g = 9.8 N/kg (or m/s^2) for all gravitational calculations, as printed on the exam cover page.
3highคะแนนที่เกี่ยวข้อง: 2Electrical quantities
Failing to convert time from minutes or hours into SI seconds in electrical and thermal energy equations.
วิธีหลีกเลี่ยง: Always multiply minutes by 60 or hours by 3600 before using time in formulas like Q = It or E = VIt.
4mediumคะแนนที่เกี่ยวข้อง: 2Momentum
Ignoring the vector nature of velocity in momentum calculations, leading to simple subtraction of values during a rebound.
วิธีหลีกเลี่ยง: Assign a positive sign to the initial velocity and a negative sign to the rebound velocity so that the change in momentum is calculated correctly as m(v - u).
5highคะแนนที่เกี่ยวข้อง: 1Physical quantities and measurement techniques
Over-rounding intermediate values in multi-step calculations, which leads to final answers that drift outside the accepted range.
วิธีหลีกเลี่ยง: Keep the full raw decimal value on your calculator screen during intermediate steps, and round only your final answer to 2 or 3 significant figures.
6mediumคะแนนที่เกี่ยวข้อง: 1Physical quantities and measurement techniques
Writing vague descriptions for variables in Paper 5/6, such as stating 'control the amount of water' instead of 'volume of water'.
วิธีหลีกเลี่ยง: Use precise scientific terms and state that you will 'keep the volume of water constant' or 'measure the mass of water using a balance'.
7mediumคะแนนที่เกี่ยวข้อง: 1Physical quantities and measurement techniques
Choosing awkward graph scales (such as multiples of 3, 6, or 7) on Paper 5/6 that make accurate plotting extremely difficult.
วิธีหลีกเลี่ยง: Select simple scale factors of 1, 2, 5, or 10 per large square so that every small square represents a straightforward decimal value.
Confusing slip rings in an a.c. generator with split-ring commutators in a d.c. motor.
วิธีหลีกเลี่ยง: Remember that a.c. generators use continuous slip rings to maintain a rotating connection, while d.c. motors use split-ring commutators to reverse the current direction every half-turn.