Grade 9 Physics Questions and Answers
A free sample of Grade 9 Physics practice questions with the correct answer and an explanation, following the Lebanese curriculum. Useful for revision before school tests and the Brevet.
أسئلة الفيزياء للصف 9 مع الأجوبة والشرح وفق المنهج اللبناني.
How to use this page: read each question, try to answer it yourself, then open the answer to check your reasoning. Questions are grouped by the chapter they belong to on EduRise, in the order of the Lebanese Grade 9 Physics programme.
15 Grade 9 Physics practice questions
Chapter: Refraction of Light · easy
1. Which term matches this definition: "the point where the incident ray meets the separating surface"?
- A. reversibility of light
- B. point of incidence
- C. critical angle
- D. angle of incidence
Show answer ▾
Answer: point of incidence
Explanation: Point of incidence: the point where the incident ray meets the separating surface
Chapter: Refraction of Light · easy
2. What is the meaning of "critical angle"?
- A. the angle between the incident ray and the normal
- B. the angle of incidence for which the angle of refraction is 90°
- C. a thin glass thread that guides light by total internal reflection
- D. the ray that continues in the second medium after refraction
Show answer ▾
Answer: the angle of incidence for which the angle of refraction is 90°
Explanation: Critical angle: the angle of incidence for which the angle of refraction is 90°
Chapter: Lenses · easy
3. What is the meaning of "dioptre"?
- A. the distance p between the object and the optical centre of the lens
- B. the ratio γ = A'B'/AB = p'/p of the image size to the object size
- C. the change of direction of light when it passes from one transparent medium to another
- D. the unit of vergence (symbol δ), equal to 1/metre
Show answer ▾
Answer: the unit of vergence (symbol δ), equal to 1/metre
Explanation: Dioptre: the unit of vergence (symbol δ), equal to 1/metre
Chapter: Lenses · easy
4. What is the meaning of "farsightedness"?
- A. a vision defect corrected with converging lenses
- B. the line through the optical centre perpendicular to the lens
- C. a lens thinner at the centre than at the edges, which spreads parallel rays apart
- D. a transparent object with curved faces that changes the direction of light by refraction
Show answer ▾
Answer: a vision defect corrected with converging lenses
Explanation: Farsightedness: a vision defect corrected with converging lenses
Chapter: Formation of Images · easy
5. An object 5 cm high gives an image 10 cm high. What is the magnification?
- A. 6
- B. 0
- C. 2
- D. 0.5
Show answer ▾
Answer: 2
Explanation: γ = 10 / 5 = 2 (enlarged image).
Chapter: Formation of Images · easy
6. Which term matches this definition: "a white surface on which a real image is caught"?
- A. magnification
- B. screen
- C. projector
- D. camera
Show answer ▾
Answer: screen
Explanation: Screen: a white surface on which a real image is caught
Chapter: The Eye · easy
7. Which term matches this definition: "the coloured ring that controls the size of the pupil"?
- A. crystalline lens
- B. iris
- C. far point
- D. optic nerve
Show answer ▾
Answer: iris
Explanation: Iris: the coloured ring that controls the size of the pupil
Chapter: The Eye · easy
8. What is the meaning of "iris"?
- A. a defect in which the image of a far object forms in front of the retina
- B. the image stays on the retina about 1/10 s after the object disappears
- C. the closest point seen clearly with maximum accommodation
- D. the coloured ring that controls the size of the pupil
Show answer ▾
Answer: the coloured ring that controls the size of the pupil
Explanation: Iris: the coloured ring that controls the size of the pupil
Chapter: Summary of the Acquired Knowledge in Electricity · easy
9. Which term matches this definition: "a circuit with several branches between two nodes, each with the same voltage"?
- A. node
- B. voltmeter
- C. short circuit
- D. parallel circuit
Show answer ▾
Answer: parallel circuit
Explanation: Parallel circuit: a circuit with several branches between two nodes, each with the same voltage
Chapter: Summary of the Acquired Knowledge in Electricity · easy
10. Which term matches this definition: "the quantity U, in volts, between two points of a circuit"?
- A. law of nodes
- B. receiver
- C. generator
- D. voltage
Show answer ▾
Answer: voltage
Explanation: Voltage: the quantity U, in volts, between two points of a circuit
Chapter: Direct and Alternating Voltages · easy
11. 4 bulbs are connected in parallel to a 9 V battery. Voltage across each bulb?
- A. 3
- B. 10
- C. 9
- D. 12
Show answer ▾
Answer: 9
Explanation: Parallel components have the same voltage: 9 V each.
Chapter: Direct and Alternating Voltages · easy
12. Which term matches this definition: "a device that raises or lowers an alternating voltage"?
- A. alternator
- B. oscilloscope
- C. dynamo
- D. transformer
Show answer ▾
Answer: transformer
Explanation: Transformer: a device that raises or lowers an alternating voltage
Chapter: Resistors · easy
13. Resistors of 120 Ω and 300 Ω are connected in series. Equivalent resistance?
- A. 86
- B. 180
- C. 36000
- D. 420
Show answer ▾
Answer: 420
Explanation: R = R₁ + R₂ = 120 + 300 = 420 Ω.
Chapter: Resistors · easy
14. What is the meaning of "resistance"?
- A. a component made to have a definite resistance; symbol: a rectangle
- B. the coloured bands on a resistor that give its value and tolerance
- C. the property of a component that opposes the passage of current, measured in ohms
- D. the single resistance that would replace a group of resistors without changing the current
Show answer ▾
Answer: the property of a component that opposes the passage of current, measured in ohms
Explanation: Resistance: the property of a component that opposes the passage of current, measured in ohms
Chapter: Electric Power and Energy · easy
15. Which term matches this definition: "the part of the energy converted into the form the appliance is made for"?
- A. kilowatt-hour
- B. useful energy
- C. Joule effect
- D. electric power
Show answer ▾
Answer: useful energy
Explanation: Useful energy: the part of the energy converted into the form the appliance is made for
More practice
These are sample questions only. The full Grade 9 Physics course on EduRise includes every chapter, lessons, 1,555 questions and timed exams.
Physics questions in other grades
Other Grade 9 subjects
See also: Grade 9 Physics chapters · All question pages · Study guides
About these questions
Where do these Grade 9 Physics questions come from?
They are a sample from EduRise's Grade 9 Physics question bank (1,555 questions across 15 chapters), written to follow the Lebanese curriculum. Each chapter on EduRise has its own practice set and a timed exam.
Are the answers explained?
Yes. Every question on EduRise shows the correct answer and an explanation after you answer, in practice mode and in the exam review.
How do I get the full question bank?
Register at edurise.me and subscribe ($10/month) to practise every chapter of Grade 9 Physics, take the timed exams and track your progress.
Practise all Grade 9 Physics questions
Create your EduRise account, choose your grade and start with the first lesson. Full access is $10/month or $80/year, all subjects included.