أسئلة الفيزياء الصف التاسع مع الحل
عيّنة مجانية من الأسئلة التدريبية في الفيزياء للصف التاسع مع الإجابة الصحيحة والشرح، وفق المنهج اللبناني. مفيدة للمراجعة قبل الاختبارات المدرسية والبريفيه.
Grade 9 Physics questions and answers – Lebanese curriculum
طريقة الاستخدام: اقرأ السؤال، حاول الإجابة بنفسك، ثم افتح الجواب لتتحقق من طريقة تفكيرك. الأسئلة مرتّبة بحسب فصلها على EduRise وبترتيب برنامج الفيزياء للصف التاسع في المنهج اللبناني.
15 سؤالاً تدريبياً في الفيزياء – الصف التاسع
الفصل: Refraction of Light · سهل
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
أظهر الجواب ▾
Answer: point of incidence
Explanation: Point of incidence: the point where the incident ray meets the separating surface
الفصل: Refraction of Light · سهل
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
أظهر الجواب ▾
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°
الفصل: Lenses · سهل
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
أظهر الجواب ▾
Answer: the unit of vergence (symbol δ), equal to 1/metre
Explanation: Dioptre: the unit of vergence (symbol δ), equal to 1/metre
الفصل: Lenses · سهل
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
أظهر الجواب ▾
Answer: a vision defect corrected with converging lenses
Explanation: Farsightedness: a vision defect corrected with converging lenses
الفصل: Formation of Images · سهل
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
أظهر الجواب ▾
Answer: 2
Explanation: γ = 10 / 5 = 2 (enlarged image).
الفصل: Formation of Images · سهل
6. Which term matches this definition: "a white surface on which a real image is caught"?
- A. magnification
- B. screen
- C. projector
- D. camera
أظهر الجواب ▾
Answer: screen
Explanation: Screen: a white surface on which a real image is caught
الفصل: The Eye · سهل
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
أظهر الجواب ▾
Answer: iris
Explanation: Iris: the coloured ring that controls the size of the pupil
الفصل: The Eye · سهل
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
أظهر الجواب ▾
Answer: the coloured ring that controls the size of the pupil
Explanation: Iris: the coloured ring that controls the size of the pupil
الفصل: Summary of the Acquired Knowledge in Electricity · سهل
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
أظهر الجواب ▾
Answer: parallel circuit
Explanation: Parallel circuit: a circuit with several branches between two nodes, each with the same voltage
الفصل: Summary of the Acquired Knowledge in Electricity · سهل
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
أظهر الجواب ▾
Answer: voltage
Explanation: Voltage: the quantity U, in volts, between two points of a circuit
الفصل: Direct and Alternating Voltages · سهل
11. 4 bulbs are connected in parallel to a 9 V battery. Voltage across each bulb?
- A. 3
- B. 10
- C. 9
- D. 12
أظهر الجواب ▾
Answer: 9
Explanation: Parallel components have the same voltage: 9 V each.
الفصل: Direct and Alternating Voltages · سهل
12. Which term matches this definition: "a device that raises or lowers an alternating voltage"?
- A. alternator
- B. oscilloscope
- C. dynamo
- D. transformer
أظهر الجواب ▾
Answer: transformer
Explanation: Transformer: a device that raises or lowers an alternating voltage
الفصل: Resistors · سهل
13. Resistors of 120 Ω and 300 Ω are connected in series. Equivalent resistance?
- A. 86
- B. 180
- C. 36000
- D. 420
أظهر الجواب ▾
Answer: 420
Explanation: R = R₁ + R₂ = 120 + 300 = 420 Ω.
الفصل: Resistors · سهل
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
أظهر الجواب ▾
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
الفصل: Electric Power and Energy · سهل
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
أظهر الجواب ▾
Answer: useful energy
Explanation: Useful energy: the part of the energy converted into the form the appliance is made for
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أسئلة الفيزياء في صفوف أخرى
مواد أخرى في الصف التاسع
اطّلع أيضاً على: فصول الفيزياء – الصف التاسع · كل صفحات الأسئلة · المقالات الدراسية
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