Instructions to candidates
- Answer all the questions in the two sections in the spaces provided after each question
- All working must be clearly shown
- Electronic calculators, mathematical tables may be used
- All numerical answers should be expressed in the decimal notations
SECTION |
QUESTION |
MAX MARKS |
CANDIDATE’S SCORE |
A |
1 – 11 |
25 |
|
B |
12 |
10 |
|
13 |
13 |
|
|
14 |
11 |
|
|
15 |
11 |
|
|
16 |
10 |
|
|
TOTAL |
80 |
|
QUESTIONS
SECTION A (25 MARKS)
Answer all the questions in the space provided
- Figure 1 below shows a ray of light reflected from a mirror
Complete the ray diagram and find the new angle of reflection after it is rotated 100 anticlockwise with the incident ray fixed (2marks) - Three electric bulbs are connected in series with a battery of two dry cells and a switch At first the bulbs light brightly
- State a reason why they gradually light dim (2marks)
- The switch is put off for sometimes Explain why the bulbs again shine brightly (1mark)
- A positively charged rod is brought near the cap of a lightly charged electroscope The leaf first collapses and as the rod comes nearer, the leaf diverges
- What is the charge on the electroscope? (1mark)
- Explain the behavior of the leaf (2marks)
- Figure 2 below shows a bar magnet attracting steel pin as shown
State and explain what would happen when a North pole of a bar magnet is brought near the tips of steel pin X and Y (2marks) - Determine the equivalent resistance between P and Q for the following resistors shown in Figure 3 (2marks)
- Figure 4 below shows a wave profile for a wave whose frequency is 5Hz
Determine the value of t8 (2marks) - An electromagnetic radiation whose wavelength is greater than that of microwaves has a wavelength of 3061224 m Take speed of light in air, c = 3 x108 m/s
- Identify the radiation (1mark)
- Calculate its frequency (2marks)
- Two heating coils A and B connected in parallel in a circuit produces power of 36W and 54W respectively What is the ratio of their resistance?(2marks)
- State two conditions necessary for total internal reflection to occur (2marks)
- Define coherent source of a wave (1mark)
- Figure 5 below show a conductor carrying electric current place between two magnetic poles
Complete the diagram by sketching the magnetic field and also show the direction of the force on the conductor (3 marks) -
- State one factor that affects the force between two charged bodies (1mark)
- To investigate charge distribution on metallic surfaces, electric charges were collected from different parts of the surfaces using a proof plane as shown in figure 6 below:
The proof plane was then placed on the cap of a neutral electroscope- State and explain the leave divergence of the electroscope as the proof plane is placed at various points round the spherical surface in figure (i) above (2marks)
- State with reason which part of the conductor in figure (ii) gave the greatest deflection of the electroscope (2marks)
- Figure 7 shows a 10µF capacitor being charged from a 12V battery by connecting the switch terminal on R The switch is then connected to S to discharge the 4µF capacitor
Determine the resultant potential difference between the two capacitors (3marks) - State two uses of capacitors (2marks)
-
- State Faradays law of electromagnetic induction (1mark)
- Figure 8 below shows a simplified circuit of a generator
- Identify parts X and Y (2marks)
X:
Y: - State two ways of making the bulb light brighter (2marks)
- Identify parts X and Y (2marks)
- An ac generator produces an emf of 500V which is used to operate a circuit that requires a minimum of 2500V If the power of the generator is 200W, determine the:
- Current generated by the ac source (2marks)
- Current supplied to the circuit by the transformer assuming 100% efficiency (2marks)
- Ratio of turns in the coils of the transformer, primary: secondary (2marks)
- Explain how power loses in a transformer are minimized (2marks)
- Eddy currents
- Hysteresis losses
-
- A disc of a siren with 100 holes is rotated at constant speed making 05 revolutions per second If air is blown towards the holes, calculate:
- The frequency of the sound produced (2marks)
- The wavelength of the sound produced, if the velocity of sound is 340 m/s (2marks)
- A ship sends out an ultrasound whose echo is received after 5 seconds If the wavelength of the ultrasound in water is 005 m and the frequency of the transmitter is 50 KHz, calculate the depth of the ocean (3marks)
- A ray of light is incident at right angles to the face AB, of a right angled isosceles prism of refractive index 16 as shown in Figure 8 below
If the prism is surrounded by a liquid of refractive index 140, determine:- The angle of incidence on the face BC (1mark)
- The angle of refraction on the face BC (3marks)
- A disc of a siren with 100 holes is rotated at constant speed making 05 revolutions per second If air is blown towards the holes, calculate:
-
- Distinguish between principal focus and focal length of a concave lens (1mark)
- Figure 9 below shows sketches of a window frame and its image formed on a screen by a convex lens
- State the nature of the image formed (2marks)
- Calculate the linear magnification of the imaged formed (2marks)
- The imaged of the frame was produced 500mm from the lens Calculate the focal length of the lens (3 marks)
- A student finds that at a distance of 25 cm, the words in a book looked blurred
- What eye defect does the student suffering from? (1mark)
- In which direction does he/she move the book to be able to see the words clearly from the distance? (1mark)
- Which lens can be used to correct the eye defect? (1mark)
-
-
- Figure 10 shows a graph of 1/v against 1/u for a concave mirror Use your graph to determine the focal length of the mirror (2marks)
- Determine the image distance when the magnification is m = 2 for the concave mirror above (3 marks)
- Figure 10 shows a graph of 1/v against 1/u for a concave mirror Use your graph to determine the focal length of the mirror (2marks)
- State one application of each of the following
- Convex mirror (1mark)
- Parabolic mirror (1mark)
- A small object is placed 15 cm in front of a convex mirror of focal length 10 cm Determine the position of the image (3marks)
-
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