Form 4 Physics imtixaanka qaranka 2020 iyo jawaabihiisa
Imtixaanka qaranka Fasalka 4aad ee 2020 ee Form 4 Physics, su'aal su'aal. Ku gal adigoo waqti leh sida imtixaanka dhabta ah, kadibna arag jawaabta iyo sharaxa su'aal kasta.
- 39 su'aalood, 100 dhibcood
- 120 daqiiqo
Gal imtixaankan
120 daqiiqo, 100 dhibcood. Su'aalaha doorashada waa laguu saxayaa; jawaabaha qoraalka adiga ayaa ku saxaya qodobada sixitaanka.
Akoon bilaash ah ayaa loo baahan yahay si aad u bilowdo, si jawaabahaaga iyo natiijooyinkaaga loo kaydiyo.
Tilmaamaha ardayga
Write all answers on the answer booklet. Write legibly in dark blue pen only. Answer all questions as provided in the question paper.
Part A: Multiple-Choice Question (40 Marks)
Choose the correct answer and write it in the answer booklet.
- 12 dhibcood
A motion of an object that regularly returns to a given position after a fixed time interval is
- A.Periodic motion
- B.Harmonic motion
- C.Oscillatory motion
- D.Wave motion
- 22 dhibcood
The maximum potential energy of vibrating mass attached to a spring is at an equilibrium when at a:
- A.Lower position
- B.Rest position
- C.Extreme position
- 32 dhibcood
Waves transfer:
- A.Molecules
- B.Atoms
- C.Energy
- D.Matter
- 42 dhibcood
Ahmed measures the room temperature during a sunny day using the thermometer below. The reading of the thermometer is
- A.30°C
- B.20 °C
- C.28°C
- D.25°C
- 52 dhibcood
All of the four objects A, B, C and D have the same weight. Which one produces the greatest pressure on the table?
- A.D
- B.A
- C.C
- D.B
- 62 dhibcood
Radio Mogadishu broadcasts on a frequency of 90MHz with a speed of 3x10^8m/s. The wavelength will be:
- A.3,33m
- B.3.33m
- C.2.22m
- D.4.44
- E.10.10m
- 72 dhibcood
In hospitals, doctors use machines that utilize a sound wave for imaging unborn babies (fetuses). This type of sound wave is:
- A.Infrasonic
- B.Sonic
- C.Ultrasonic
- D.Audible sonic
- 82 dhibcood
A person sees his/her image in a plane mirror because the mirror
- A.Absorbs light
- B.Reflects light
- C.Transmits light
- D.Diffuses light
- 92 dhibcood
When a newspaper is seen through a lens, its print appears larger. The nature of the lens is:
- A.Convex
- B.Converging
- C.Parabolic
- D.Concave
- 102 dhibcood
Identify the primary colours of light?
- A.Red, blue, cyan
- B.Red, green, violet
- C.Yellow, green, blue
- D.Red, green, blue
- 112 dhibcood
Light is a form of energy produced by a _____
- A.Luminous object
- B.Transparent object
- C.Non-luminous object
- D.Translucent object
- 122 dhibcood
When we shine a yellow light on a red card, the reflected color will be:
- A.Blue
- B.Red
- C.Green
- D.Cyan
- 132 dhibcood
An object is placed at a distance of 20cm from a concave mirror whose focal length is 10cm. The distance of image is
- A.30cm
- B.60cm
- C.150 cm
- D.20 cm
- 142 dhibcood
What is the focal length of the combination of two thin lenses of power +5D and -2D placed in contact with each other?
- A.-3m
- B.33.33m
- C.-0.33m
- D.3m
- 152 dhibcood
The process of causing small nuclei to stick together into a larger nucleus is known as
- A.Fusion
- B.Fission
- C.Radioactivity
- D.Mass defect
- 162 dhibcood
Which of the following about the Gamma ray is true?
- A.It carries a positive charge
- B.It carries a negative charge
- C.It is an electromagnetic waves
- D.It is similar to electrons
- 172 dhibcood
The image produced by a concave lens is:
- A.Always virtual and enlarged
- B.Always virtual and smaller
- C.Always real
- D.Sometimes real and sometimes virtual
- 182 dhibcood
An object placed at 2m from a plane mirror is shifted by 0.5m away from the mirror. What is the distance between the object and its image?
- A.2m
- B.1.5m
- C.5m
- D.3m
- 192 dhibcood
Which of the following describes a change of frequency?
- A.Echoes
- B.Loudness
- C.Beats
- D.Pitch
- 202 dhibcood
A student investigates how the current in a resistor varies with voltage. The student plots a graph of his/her result. When the potential difference is 4v, the current is:
- A.0.2A
- B.0.3A
- C.0.1A
- D.0.4A
PART B: Structured Questions (60 marks)
Answer all the questions and write your answers in the answer booklet.
- 21bi1 dhibcood
21. Waves. The diagram shows a transverse wave (displacement from -2 to 2 against time in seconds). Find the amplitude of the wave
- 21bii1 dhibcood
21. Waves. The diagram shows a transverse wave (displacement from -2 to 2 against time in seconds). Find the frequency of the wave
- 21c2 dhibcood
Differentiate between transverse and longitudinal waves
- 21d2 dhibcood
Fatima shakes a rope which forms a wave whose wavelength is 10cm and its frequency is 20Hz. What is the speed of the wave?
- 21ei1 dhibcood
Diagrams A, B and C show the behavior of waves (A: waves passing through a gap, B: waves meeting a slanted barrier, C: waves bending as they cross a boundary). Use the table (Refraction, reflection, Diffraction, Polarization, interference) to complete: A is _____
- 21eii1 dhibcood
Diagrams A, B and C show the behavior of waves (A: waves passing through a gap, B: waves meeting a slanted barrier, C: waves bending as they cross a boundary). Use the table (Refraction, reflection, Diffraction, Polarization, interference) to complete: B is _____
- 21eiii1 dhibcood
Diagrams A, B and C show the behavior of waves (A: waves passing through a gap, B: waves meeting a slanted barrier, C: waves bending as they cross a boundary). Use the table (Refraction, reflection, Diffraction, Polarization, interference) to complete: C is _____
- 21f2 dhibcood
What is the difference between a node and an antinode?
- 22a2 dhibcood
22. Refraction of light: What is Snell's law of refraction?
- 22bi2 dhibcood
The diagram shows an object and its image formed by a lens. What type of lens is shown in the diagram?
- 22bii2 dhibcood
The diagram shows an object and its image formed by a lens. Is the image real or virtual?
- 22c2 dhibcood
An object is placed 15cm from a convex lens of a focal length of 10cm. Find the position of the image.
- 22d2 dhibcood
A ray of light strikes the surface of a material at an angle of 45° such that the angle of refraction is 30°. Calculate the refractive index of the material.
- 23a2 dhibcood
23. Nuclear physics: Define the term "isotopes"
- 23bi1 dhibcood
Find the missing value of the following reaction: (238 over 92)U -> (X over Y)Th + (4 over 2)He + Energy
- 23bii1 dhibcood
Find the missing value of the following reaction: (14 over 6)C -> (X over Y)N + (0 over -1)e + Energy
- 23ci2 dhibcood
The graph shows how the activity of radioactive sample varies with time (activity in becquerels, from 80 at time 0, against time in days). From the graph above, what would the activity of the sample become after 6 days?
- 23cii2 dhibcood
Explain the meaning of "half-life"
- 23d1 dhibcood
Use the words in the box (Gamma rays, Beta particles, Alpha particles) to fill the blank: Which has the most penetrating power?
Imtixaanka waxaa diyaarisay Federal Ministry of Education, Culture and Higher Education (MoECHE), Somalia. Waxaa lagu wadaagay bilaash si ardaydu ugu diyaargaroobaan. Jawaabaha iyo sharaxyada waxaa qoray macallimiinta Sheerxirfad.
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