Questions and Answers
Given three vectors with their positions 30° West of South, then the magnitude of the resultant vector is:
Which of these characteristics of the wave are changed due to refraction?
What is the average speed of a man who walks for 1 minute at a speed of 2m/s and then runs for 2 minutes at 5m/s along a straight road?
What is the coefficient of friction for a 52Kg box requiring a force of 200N to pull across a horizontal surface at constant speed?
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Which statement about the force on a charged particle placed in a magnetic field is TRUE?
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Where was the train 2 seconds after it began its motion if it starts from rest and covers 400m in 10 seconds with constant acceleration?
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Which one of the elements gives an N-type semiconductor when they are doped with a pure semiconductor?
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According to Archimedes' principle, if a solid object floats, the volume of displaced water is equal to the volume of:
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What is the value of the tension T1 and T2 respectively for a 10kg object hung with two cords?
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Study Notes
General Examination Guidelines
- Examination consists of 50 multiple-choice questions, each worth 0.8 marks.
- Candidates must select the best answer and blacken the letter on a separate answer sheet.
- Use pencil for marking answers; marks must be clear and cover the entire answer space.
- Erase all unnecessary marks completely from the answer sheet.
- Duration of the exam is 2 hours and 30 minutes.
- Cheating results in immediate dismissal and score cancellation.
- Ensure all required information is written on the answer sheet before beginning.
Reference Physical Constants
- Acceleration due to gravity: 10 m/s²
- Mass of proton: 1.67 x 10⁻²⁷ kg
- Mass of electron: 9.1 x 10⁻³¹ kg
- Charge of proton and electron: 1.6 x 10⁻¹⁹ C
- Earth's magnetic field: 5 x 10⁻⁵ T
- Permittivity of free space (ε₀): 8.85 x 10⁻¹² Nm²/C²
- Permeability of free space (μ₀): 4π x 10⁻⁷ Tm/A
- Electric force constant (k): 9 x 10⁹ Nm²/C²
- Specific heat capacities:
- Water: 4200 J/kg°C
- Copper: 390 J/kg°C
- Linear latent heats:
- Water (vaporization): 2.26 x 10⁶ J/kg
- Water (fusion): 3.34 x 10⁵ J/kg
- Density of water: 1000 kg/m³
Sample Problem Highlights
- Resultant vector calculation: determine the magnitude with given angles (e.g., 30° West of South).
- Refraction affects wave characteristics: changes involve wavelength (λ) and speed (v) but frequency (f) remains unchanged.
- Average speed: calculated based on distances and times for different segments of motion.
- Coefficient of friction: derived from force applied to move an object at constant speed over a surface.
- Magnetic forces on charged particles depend on the particle's motion relative to the magnetic field.
- Kinematics: calculate distance traveled by a train under constant acceleration over a specified time.
- N-type semiconductors formed with doping elements: e.g., Phosphorus, arsenic, and antimony.
- Archimedes' Principle: the volume of displaced water by a floating solid equals the volume of the submerged portion.
Tension in Cord Problem
- Analyze a mass suspended with cords to calculate tension values based on the configuration and forces acting on the system.
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Description
Prepare for your Grade 12 Physics exam with this model examination featuring 50 multiple-choice questions. Each question is worth 0.8 marks, designed to test your knowledge and understanding of key physics concepts. Make sure to follow the provided instructions carefully on the answer sheet.
