Unit 1, try it
Which of the following shows oscillatory motion?
Press a choice to see the answer.
Prepare for the national exam in Form 4 Physics with 2,688 questions written from the school book, unit by unit. Practise the units you choose with every answer explained, or sit a full timed test and see honestly whether you are ready.
What you get
- No question twice: You are given new questions until you have seen them all. Only then do the ones you got wrong return.
- Every answer explained: A short reason with each answer, and the page of the book to read again.
- A full timed test: Questions from the whole book against the clock, with no answers shown until you hand in.
- An honest verdict: Ready, close or not yet, for each unit. It is only given once you have answered enough for it to mean something.
Units and lessons
Lesson 1: Periodic and oscillatory motion
- Oscillatory motion
- Periodic motion
- Frequency and period of periodic motion
- Simple harmonic motion
- Examples of simple harmonic motion
- Mass attached to a spring
- Hooke's law
Lesson 2: Mathematical representation of simple harmonic motion
- Terms used to describe SHM
- Period and frequency of SHM
- Energy of simple harmonic motion
Lesson 3: Equations of Simple harmonic motion and reference circle
- Reference circle
- Displacement of SHM
- Velocity of SHM
- Acceleration of SHM
Lesson 4: Simple pendulum and applications of SHM
- Simple pendulum
- Applications of simple harmonic motion
Lesson 1: Types of waves
- Introduction
- Mechanical waves
- Water waves
- String waves
- Seismic waves
- Transverse waves
- Longitudinal waves
- Electromagnetic waves
- Gamma rays
- X-rays
- Comparing gamma rays and X-rays
- Radio and microwave communication
- Using microwaves for communication
- Dangers of electromagnetic radiations
- Heating and burns
- Skin cancer and eye conditions
- Cancer and radiation sickness
- Lesson exercise
- Chapter exercise
- Speed of light and sound
Lesson 2: Properties of waves and equation of wave motion
- Properties of waves
- Rectilinear propagation
- Reflection
- Refraction
- Diffraction
- Interference
- Superposition principle
- Stationary waves
- Strings fixed at both ends
- Strings fixed at one end
- Terms of wave motion
- The wave equation
- Lesson exercise
- Chapter exercise
Lesson 1: Introduction to sound waves
- Introduction to sound waves
- Sound wave
- Speed of sound in different media
- Conditions for hearing sound
- Sources of sound waves
- Measuring the speed of sound
- Lesson exercise
- Speed of sound
Lesson 2: Reflection of Sound and Echo
- Reflection of sound
- Echo
- Uses of echo
- Conditions for formation of echoes
- Echo calculations
- Laws of reflection of sound
- Applications of reflection of sound
- Reverberation
- Lesson exercise
Lesson 3: Properties of sound
- Properties of sound
- Intensity and loudness
- Intensity level
- Frequency and pitch
- Harmonic content and quality
- Range of audibility
- Infrasonic sounds
- Ultrasonic sounds
- Ultrasound
- Uses of ultrasound
- Infrasound and ultrasound
- Forced vibrations
- Resonance
- Measuring the speed of sound using resonance
- Conditions for resonance
- Examples of resonance
- Standing waves in pipes
- Harmonic frequency
- Pipes with two open ends
- Pipes with one open and one closed end
- Vibrating strings
- Doppler effect
- Pitch
- Quality
Lesson 1: Reflection of light on plane surface
- Introduction
- Common characteristics of light
- Reflection of light
- Types of reflection of light
- General definitions about reflection
- Laws of reflection
- Normal incidence
- Image formed by plane mirrors
- Inversion and lateral inversion
- Differences between virtual and real image
- Characteristics of an image formed in a plane mirror
- Image formed by two plane mirrors
- Uses of plane mirror
- Reflecting periscope
- Uses of reflecting periscope
- Disadvantages of reflecting periscope
- Lesson exercise
Lesson 2: Reflection of light at curved surface
- Reflection of light at curved surface
- Concave mirrors and convex mirrors
- General definitions for spherical mirrors
- Concave mirror as converging mirror
- Convex mirror as diverging mirror
- Principal focus
- Focal length and radius of curvature
- Focal plane
- Graphical construction of images
- Rules for drawing images in a concave mirror
- Object at infinity, rays parallel to the principal axis
- Object at infinity, rays not parallel to the principal axis
- Object beyond the centre of curvature
- Object at the centre of curvature
- Object between the centre of curvature and the principal focus
- Object at the principal focus
- Object between the principal focus and the pole
- Summary of images formed by a concave mirror
- Rules for drawing images in a convex mirror
- Formation of images in a convex mirror
- Uses of concave mirrors
- Uses of convex mirrors
- Numerical problems on spherical mirrors
- Lesson exercise
- Chapter exercise
Lesson 1: Refraction of light in media
- Introduction to refraction
- Refraction of light through a glass slab
- Terms about refraction
- Laws of refraction (Snell's law)
- Refractive index and speed of light
- Lateral displacement
- Optical density
- Simple effects of refraction
- Critical angle and total internal reflection
- Applications of total internal reflection
- Lesson exercise
- Chapter exercise
Lesson 2: Refraction by spherical lenses
- Introduction to lenses
- Concave lenses
- Convex lenses
- Simple terms used in lenses
- Rules for drawing images in a concave lens
- Images formed by a concave lens
- Rules for drawing images in a convex lens
- Images formed by a convex lens
- Sign convention for lenses
- Lens formula and magnification
- Numerical problems on lenses
- Power of lenses
- Unit of power of lens
- The power of two or more lenses
- Lesson exercise
- Chapter exercise
Lesson 3: Optical instruments
- Simple microscope (magnifying glass)
- Parts of a microscope
- Photographic camera
- Human eye
- Accommodation of the eye
- Defects of vision and their correction
- Short-sightedness or myopia
- Correction of short-sighted eye
- Long-sightedness or hypermetropia
- Correction of long-sightedness
- Presbyopia
- Advantages of having two eyes in humans
- Lesson exercise
- Chapter exercise
Lesson 1: Refraction of light through a glass prism
- Introduction
- Refraction of light through a glass prism
- Dispersion of light by glass prism
- Recombination of spectrum colours to give white light
- What causes dispersion of white light?
- Monochromatic light
- Polychromatic light
- Rainbow
- Atmospheric refraction
- Scattering of light
- Common phenomena of atmospheric scattering
- Lesson exercise
- Chapter exercise
Lesson 2: Colours and pigments
- Colours and pigments
- Pigment
- Colour of opaque object in white light
- Colour of transparent objects in white light
- Colours of opaque objects in coloured light
- Using filters of primary colours
- The colour of transparent objects in coloured light
- Mixing of colours
- Pair of complimentary colour
- Colour mixing as an additive process
- Mixing pigments
- Primary pigment
- Lesson exercise
- Chapter exercise
Lesson 3: Invisible spectrum
- Invisible spectrum
- Infrared spectrum
- Sources of infra-red radiation
- Properties of infra-red radiations
- Uses of infra-red rays
- Ultra violet spectrum
- Sources of ultra-violet radiation
- Properties of ultra-violet radiations
- Uses of ultraviolet radiations
- Lesson exercise
- Chapter exercise
Lesson 1: Electromagnetic induction
- Introduction
- Electromagnetic induction
- Applications of electromagnetic induction
- Magnetic flux
- Induced electromotive force (emf)
- Experiment: induced current
- Lesson exercise
- Chapter exercise
Lesson 2: Faraday's Law of Induction
- Faraday's law of induction
- Real life applications of Faraday's law
- Lesson exercise
Lesson 3: Lenz's law
- Lenz's law explained
- Experiment to verify Lenz's law
- Finding the direction of induced current
- Applications of Lenz's law
- Lesson exercise
Lesson 1: Alternating current (AC)
- Introduction
- Current and voltage of AC
- Power dissipated by an alternating current
- Root mean square values
- Electric generator
- AC generator
- Principle of AC generator
- Work of AC generator
- Lesson exercise
- Chapter exercise
Lesson 2: Simple AC Circuits
- Simple AC circuits
- AC circuit through resistance
- AC circuit through capacitor
- AC Circuit through Capacitor
- AC Circuit through Inductor
- Example 8.5
- Example 8.6
- Practice
- Lesson exercise
- Chapter exercise
Lesson 3: Transformers
- Transformers
- Transformer Construction
- Principles of transformers
- Energy losses
- Transformer rule
- Step up and step down transformers
- Power distribution
- Example 8.7
- Example 8.8
- Example 8.9
- Practice
- Lesson exercise
- Chapter exercise
Lesson 1: The meaning of electronics
- The meaning of electronics
- Energy bands
- Insulators
- Conductor
- Semiconductors
- Functions of electronic devices
- Lesson exercise
- Chapter exercise
Lesson 2: Semiconductors
- Semiconductors
- Properties of semiconductor
- Effect of temperature on semiconductors
- Commonly used semiconductors
- Holes and electrons
- Types of Semiconductor
- Intrinsic Semiconductor
- Extrinsic semiconductor
- Types of impurities
- N-type semiconductor
- P-type semiconductors
- Uses of semiconductor in everyday life
- Lesson exercise
- Chapter exercise
Lesson 3: Semiconductor device and logic gates
- PN Junction
- Applying voltage across PN-Junction
- Forward biasing
- Reverse biasing
- Diode
- Applications of diodes
- Transistors
- Types of transistors
- Naming the transistor terminals
- Applications of Transistors
- Logic gates
- Basic logic gates
- AND gate
- OR gate
- NOT gate
- Working principle of logic gates
- Uses of logic gates
- Lesson exercise
- Chapter exercise
Lesson 1: Electrons and photons
- Introduction
- Cathode rays
- Cathode ray oscilloscope
- Thermionic emission
- Properties of cathode rays
- Electron kinetic energy and the electron volt
- Example 10.1
- Practice
- Photoelectric Effect
- Factors affecting Photoelectric Emission
- Planck's equation and photon energy
- Example 10.2
- Example 10.3
- The work function
- Example 10.4
- Speed of cathode rays
- Einstein's photoelectric equation
- Example 10.5
- De Broglie's equation
- Lesson exercise
Lesson 2: Electromagnetic spectrum
- Electromagnetic spectrum
- Photon energy
- Gamma radiation and X-rays
- Ultraviolet, visible light, infrared and radio
- Generation of electromagnetic waves
- Properties of electromagnetic waves
- Properties of X-rays
- Lesson exercise
- Chapter exercise
Lesson 1: Atomic structure
- Atomic structure
- Atomic models
- Main equations of Bohr model
- Isotopes and isobars
- Lesson exercise
Lesson 2: Nuclear mass and binding Energy
- Nuclear physics
- Mass and energy
- Binding energy and mass defect
- Nuclear force
- Lesson exercise
Lesson 3: Radioactivity
- Radioactivity
- Effects of fields on radiations
- Alpha particles
- Beta particles
- Gamma rays
- Penetrating power
- Uses of radioactivity
- Hazards of radioactivity
- Lesson exercise
Lesson 4: Nuclear reactions and half-life
- Nuclear reactions
- Nuclear fission
- Nuclear fusion
- Half-life
- Lesson exercise
- Chapter questions
National exam past papers
The real Form 4 national exams of past years. Take one against the clock, then see every answer explained.
- National exam 2024/202559 questions, 100 marks, 120 minutes
- National exam 202456 questions, 100 marks, 120 minutes
- National exam 202250 questions, 100 marks, 120 minutes
- National exam 202148 questions, 100 marks, 120 minutes
- National exam 202039 questions, 100 marks, 120 minutes
- National exam 201851 questions, 100 marks, 120 minutes
Most tested in the national exam
The units the past papers asked about most, by marks. Revise these first.
- Unit 1. Oscillatory Motion86 marks
In 6 of 6 papers: 2018, 2020, 2021, 2022, 2024, 2024/2025
- Unit 5. Refraction of Light75 marks
In 6 of 6 papers: 2018, 2020, 2021, 2022, 2024, 2024/2025
- Unit 4. Reflection of light73 marks
In 6 of 6 papers: 2018, 2020, 2021, 2022, 2024, 2024/2025
- Unit 6. Dispersion of light70 marks
In 6 of 6 papers: 2018, 2020, 2021, 2022, 2024, 2024/2025
- Unit 3. Sound Waves65 marks
In 6 of 6 papers: 2018, 2020, 2021, 2022, 2024, 2024/2025
- Unit 2. Wave Motion61 marks
In 5 of 6 papers: 2018, 2020, 2021, 2024, 2024/2025
- Unit 11. Nuclear Physics46 marks
In 6 of 6 papers: 2018, 2020, 2021, 2022, 2024, 2024/2025
- Unit 7. Electromagnetic induction34 marks
In 4 of 6 papers: 2021, 2022, 2024, 2024/2025
A course that goes with this subject
Computer Hardware
Electricity and circuits in practice: computer hardware.
6.6 USDSee the course
The practice is free whether or not you take a course.
Sample questions
Unit 2, try it
Waves on a pond are generated by a pebble thrown into still water. Which shapes can such waves have?
Press a choice to see the answer.
Unit 3, try it
When you put your fingers on your throat as you speak, you feel vibrations. What does this show?
Press a choice to see the answer.
Unit 4, try it
Objects that emit light by themselves are called:
Press a choice to see the answer.
Questions students ask
Is the exam preparation really free?
Yes. Practice and the full timed test are free and stay free. You only need a free account, so that your answers and your progress are saved.
Where do the questions come from?
Every question is written from the Form 4 student book used in schools, unit by unit and lesson by lesson. Each answer shows the book page it comes from, so you can go back and read it.
Are these past exam papers?
No. These are practice questions that follow the book, not copies of past government papers. They train you on everything the book covers, so you know the material whatever is asked.
Will I see the same question again?
Not until you have been given every question in the units you chose. After that, the ones you got wrong come back first.
How do I know I am ready?
After 20 answers in a unit you get a verdict for that unit. Ready means 75 percent or more in every unit, not only a good average. The full timed test shows how you do under exam conditions.
Can I use it on my phone?
Yes. It works in the browser of any phone. There are no videos to load: a question, its choices and the explanation.
Do I have to buy a course?
No. The practice does not depend on any course. Now and then we suggest one course that fits how you are doing. You can ignore it.
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2,688 practice questions in 11 units
