Form 4 Physics national exam 2022 with answers
The 2022 Form 4 national exam paper for Form 4 Physics, question by question. Take it timed like the real exam, then see the answer and explanation to every question.
- 50 questions, 100 marks
- 120 minutes
Take this paper
120 minutes, 100 marks. Multiple choice is marked for you; you mark your written answers against the marking points.
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Instructions to candidates
Answer all questions in the ANSWER BOOKLET.
Part one: Circle the letter of the correct answer (50 marks)
- 12 marks
For a periodic motion, the time taken to make one complete cycle is called
- A.Frequency.
- B.Period.
- C.Amplitude.
- D.Angular frequency.
- 22 marks
If Hassan transported a simple pendulum to the moon, then the time period
- A.Increases
- B.Decreases
- C.Remains the same
- D.Halved.
- 32 marks
The numBer of neutrons in technetium-99 (99/43 Tc) is
- A.43
- B.65
- C.50
- D.56
- 42 marks
The process by which a heavy unstable nucleus splits into two or more smaller nucleus is
- A.Nuclear fission
- B.Nuclear fusion
- C.Reactor
- D.activation
- 52 marks
An electron is travelling at a speed of 4 x 10^7 m/s. The De-Broglie's wave length (use h = 6.63 x 10^-34 Js, Me = 9.1 x 10^-31 kg) is:
- A.3.5 x 10^-11 m
- B.2.4 x 10^-11 m
- C.3.0 x 10^-11 m
- D.1.8 x 10^-11 m
- 62 marks
The process by which electrons are emitted from the surface of a metal when an electromagnetic radiation falls on it is
- A.Photon
- B.Photoelectric effect
- C.Photocell
- D.Photovoltaic
- 72 marks
Electronic circuits deal with the flow of electric charges through a _____ Conductor.
- A.Metal
- B.Non-metal
- C.Metalloids
- D.Air
- 82 marks
The process by which an electronic device converts DC power into AC power of any frequency is called
- A.Generation
- B.Rectification
- C.Adaptor
- D.Amplification
- 92 marks
In forward biasing, the potential barrier is
- A.Increased
- B.Reduced
- C.Constant
- D.Too large.
- 102 marks
The measurement of the total magnetic field which passes through a given Area is
- A.Magnetic field.
- B.Magnetic flux.
- C.Magnetic field lines.
- D.Materials.
- 112 marks
The potential difference produced by the battery is
- A.Electric force
- B.Electromagnetic
- C.Electromotive force
- D.Electric force.
- 122 marks
A straight wire 0.8m long moves with a speed of 40m/s vertically on a horizontal vertical magnetic field of 0.5T. the induced Emf is
- A.14V
- B.15V
- C.16V
- D.17V
- 132 marks
The source of direct current is
- A.Batteries
- B.Generators
- C.Sun
- D.Air
- 142 marks
A machine that converts a mechanical energy into electrical energy is called
- A.Inductor
- B.Motor
- C.ElEctric generator
- D.Oscillators
- 152 marks
In order to produce a white light from the dispersed colours, we use
- A.Dispersion
- B.Recombination
- C.Colours
- D.Pigment
- 162 marks
When a white light is incident on a blue object, the object will appear
- A.Green
- B.Blue
- C.Red
- D.Yellow.
- 172 marks
To detect an original diamond from a fake diamond, we use
- A.Infrared radiation
- B.Ultraviolet radiation
- C.Radio wave
- D.Microwave.
- 182 marks
A capacitor is connected to 120V, 60Hz source. If its capacitance is 20 microF. the capacitive reactance is
- A.1.33 x 10^2 ohm
- B.1.8 x 10^2 ohm
- C.1.9 x 10^2 ohm
- D.3 x 10^2 ohm
- 192 marks
The reflection of sound is called
- A.Reverberation
- B.Refraction
- C.Diffraction
- D.Echo
- 202 marks
The frequency range of hearing in humans is between
- A.30Hz to 30Khz
- B.40Hz to 40KhZ
- C.20Hz to 20 KHz.
- D.50Hz to 50kHz
- 212 marks
Which mirror can produce an erect image with magnification equal to one?
- A.Concave mirror
- B.Plane mirror
- C.Convex mirror
- D.Concave lens
- 222 marks
If the angle of reflection is 30° then, the angle of incidence is
- A.90°
- B.60°
- C.450°
- D.30°
- 232 marks
If the image formed by a lens is always diminished and erect, the nature of the image is
- A.Concave lens
- B.Convex lens
- C.Biconvex lens
- D.Plano convex lens
- 242 marks
Which of the following are sources of light?
- A.Mountain
- B.Wall
- C.Insects
- D.Sun
- 252 marks
A sound wave has a frequency of 200Hz and a speed of 400m/s, its wave length is
- A.4m.
- B.1/2 m.
- C.2m
- D.0.8 x 10^4 m
Part two: Match Column A and Column B (10 marks)
- M11 mark
Match with Column B: The mechanical energy of a system is 150J. What is the kinetic energy of the system at the rest position? Column B choices: Cathode rays; Kinetic energy is 150J; Alpha; 0.5Hz; 92; Weber; red; depletion layer; 3x10^8 m/s; doping.
- M21 mark
Match with Column B: Mass oscillates on a horizontal spring with a period T = 2.0s. what is the frequency? Column B choices: Cathode rays; Kinetic energy is 150J; Alpha; 0.5Hz; 92; Weber; red; depletion layer; 3x10^8 m/s; doping.
- M31 mark
Match with Column B: The atomic Number of uranium isotope 238/92 U is Column B choices: Cathode rays; Kinetic energy is 150J; Alpha; 0.5Hz; 92; Weber; red; depletion layer; 3x10^8 m/s; doping.
- M41 mark
Match with Column B: Which of the following particles are protons Column B choices: Cathode rays; Kinetic energy is 150J; Alpha; 0.5Hz; 92; Weber; red; depletion layer; 3x10^8 m/s; doping.
- M51 mark
Match with Column B: A stream of electrons at higher speed from a heated cathode is called Column B choices: Cathode rays; Kinetic energy is 150J; Alpha; 0.5Hz; 92; Weber; red; depletion layer; 3x10^8 m/s; doping.
- M61 mark
Match with Column B: The process of adding impurity atoms to a pure semiconductor is called Column B choices: Cathode rays; Kinetic energy is 150J; Alpha; 0.5Hz; 92; Weber; red; depletion layer; 3x10^8 m/s; doping.
- M71 mark
Match with Column B: The region where the electrons and holes are emptied is called Column B choices: Cathode rays; Kinetic energy is 150J; Alpha; 0.5Hz; 92; Weber; red; depletion layer; 3x10^8 m/s; doping.
- M81 mark
Match with Column B: The SI unit of magnetic flux is Column B choices: Cathode rays; Kinetic energy is 150J; Alpha; 0.5Hz; 92; Weber; red; depletion layer; 3x10^8 m/s; doping.
- M91 mark
Match with Column B: Red filter absorbs all the colours of white light except Column B choices: Cathode rays; Kinetic energy is 150J; Alpha; 0.5Hz; 92; Weber; red; depletion layer; 3x10^8 m/s; doping.
- M101 mark
Match with Column B: The speed of light in a vacuum is Column B choices: Cathode rays; Kinetic energy is 150J; Alpha; 0.5Hz; 92; Weber; red; depletion layer; 3x10^8 m/s; doping.
Part three: Structure Questions (40 marks)
- Q1.14 marks
Question one: oscillatory motion. Write the formula of Hook's Law.
- Q1.25 marks
Question one: oscillatory motion. How much mass should be at the end of a spring of K = 100N/m in order to have a period of 2s.
- Q2.12 marks
Question two: Reflection of light. State the types of reflection of light.
- Q2.24 marks
Question two: Reflection of light. Distinguish between real image and virtual image.
- Q2.3A3 marks
Question two: Reflection of light. Farah stands at distance of 5m in front of a convex mirror of focal length 10m. calculate A. Position and magnification of image.
- Q2.3B3 marks
Question two: Reflection of light. Farah stands at distance of 5m in front of a convex mirror of focal length 10m. B. State it's Nature.
- Q3.15 marks
Question three: Dispersion of light. Use the following prism below and then complete the missing colors. (A diagram shows white light entering a prism and splitting into seven bands; only Red and Green are labelled.)
- Q3.2A1 mark
Question three: Use the information in the table below to fill the gaps. (Table: Visible light, Radio wave, infrared radiation, X-rays, Gama rays.) A. It is used in photosynthesis process in the plants _____
- Q3.2B1 mark
Question three: Use the information in the table below to fill the gaps. (Table: Visible light, Radio wave, infrared radiation, X-rays, Gama rays.) B. It is used in TV remote controls _____
- Q3.2C1 mark
Question three: Use the information in the table below to fill the gaps. (Table: Visible light, Radio wave, infrared radiation, X-rays, Gama rays.) C. It locates bone fractures _____
- Q3.2D1 mark
Question three: Use the information in the table below to fill the gaps. (Table: Visible light, Radio wave, infrared radiation, X-rays, Gama rays.) D. It is used in communication _____
- Q3.2E1 mark
Question three: Use the information in the table below to fill the gaps. (Table: Visible light, Radio wave, infrared radiation, X-rays, Gama rays.) E. It is used for treatment of cancer cells _____
- Q3.34 marks
Question three: Dispersion of light. Distinguish between monochromatic light and polychromatic light.
- Q4.13 marks
Question four: Sound wave. Determine the speed of sound at 40°C
- Q4.22 marks
Question four: Sound wave. What is the relation b/w the frequency of a sound wave and its pitch?
Paper set by the Federal Ministry of Education, Culture and Higher Education (MoECHE), Somalia. Shared free of charge to help students prepare. The answers and explanations are written by Sheerxirfad teachers.
