INSTRUCTIONS TO CANDIDATES:
- This paper consists of two sections, A and B
- Answer all questions in section A and B
- All working must be clearly shown
- Scientific calculators and KNEC Mathematical tables may be used
- Take g = 10m/s2
For Examiners’ Use Only
SECTION |
QUESTION |
MAXIMUM SCORE |
CANDIDATE’S SCORE |
A |
1-13 |
25 |
|
B |
14 |
12 |
|
15 |
10 |
||
16 |
12 |
||
17 |
13 |
||
|
18 |
08 |
|
TOTAL |
80 |
QUESTIONS
SECTION A (25 MARKS)
- The figure 1 below shows the image in front of a mirror M
By ray diagram construction, locate the position of the object (2mks) - Figure 2 below shows a sharp pin fixed on a cap of leaf electroscope The electroscope is highly charged and then left for some time
Explain why the leaf collapses (1mk) - Explain how polarization reduces current in a simple primary cell State how it can be reduced (2mks)
- Fig 3 below shows a ray incident on a converging lens
Fig 3
Complete the ray diagram by showing the emergent ray (1mk) - The chart below shows an arrangement of different parts of the electromagnetic spectrum
Radio
A
Infrared
Visible
B
X-Rays
Gamma Rays
- Name the radiation represented by B (1mk)
- Name a device that can be used to detect radiation A (1mk)
- An object is placed in between two parallel mirrors How many images can a student see? (2mks)
- A car battery requires topping up with distilled water occasionally Explain why this is necessary and why distilled water is used (2mks)
- What causes electrical resistance in conductors? (1mk)
- In determining the depth of an ocean, an echo sounder producing ultrasonic sound is used
Give one reason why this sound is preferred (1 mk) - State the conditions necessary for a wave incident on a slit to be diffracted (2mks)
- Figure represents a long horizontal insulated wire XY connected in an electric circuit The circle represents where a plotting compass is placed on the wire
- In the circle put an arrow to show the direction the N pole of the compass will deflect when switch k is closed (1mk)
- Mention any two ways of reversing the direction captured in (i) above (2mk)
- The diagram below shows a permanent magnet suspended by a spring State with a reason the behavior of the magnet when the switch is closed (2mks)
-
- Define principal focus as used in curved surfaces (1mk)
- An object OB is placed in front of a convex mirror as shown below drawn to scale
- Draw a ray diagram to show the position of the image formed (3mks)
SECTION B (55 MARKS)
-
- State the basic law of electrostatics (1mks)
- Figure 3 shows a pear shaped conductor with positive charged on its surface
Fig 3
A proof plane is used to touch side B of the conductor and then the cap of an uncharged electroscope This is then repeated with side A- Give the observation made on the electroscope in each case (2mks)
- What conclusion is drawn from the observation in (i) above (1mk)
- Draw on the diagram above the illustration of your conclusion in (ii) above (1mk)
- Name one application of such a conductor (1mk)
- The figure below shows an arrangement which may be used to charge a capacitor of capacitance 5µ0F and then to connect it to a capacitor of capacitance 20µF
- The switch S is first placed at position A, so that the capacitor C is connected to the 12V dc supply Calculate the charge stored in the capacitor (3mks)
- The switch S is now changed to position B Calculate the final potential difference across the capacitors (3mks)
-
- Distinguish between transverse and longitudinal wave (2mks)
- The diagram below shows a transverse wave traveling in different media
- Name any two changes that the waves undergo in moving from medium I to medium II (2mks)
- State with reason which of the two media is denser (2mks)
- The diagram below represents a microwave travelling in air through points A and B
The distance between A and B is 40 cm Determine the wavelength of the microwave shown in the figure (1mk) - Sketch on the same figure another wave with half amplitude and double frequency (1mk)
- A starting pistol is fired 640 m away from a spectator
The spectator hears the sound of the starting pistol two seconds after seeing the flash from the gun What is the speed of sound in air? (2mks)
- The graphs in the figure below show the relation between the current I and the potential difference V for a resistor and a lamp
-
- Describe how, if at all, the resistance varies as the current increases in (2mks)
- The resistor,
- The lamp
- State the value of the potential difference when the resistor and the lamp have the same resistance (1mk)
- Describe how, if at all, the resistance varies as the current increases in (2mks)
- The two components are connected in parallel to a supply of emf 40 V Calculate the total resistance of the circuit (1mk)
- The circuit below is connected The potential difference across resistor R is measured
The ammeter reading and voltmeter reading are shown on the scales below- Record these two readings (2mk)
ammeter reading = .........................................................A
voltmeter reading = .........................................................V
- Record these two readings (2mk)
- Using the values above calculate
- the resistance of R, (2mks)
- find the total resistance of the circuit (2mks)
- Which two indicators guide one on when to recharge a lead acid accumulator? (2mks)
-
-
- Some students wish to determine the focal length of a convex lens of thickness 06cm using an optical pin and a plane mirror Figure 6 shows the experimental set up when there is no parallax between the pin and the image
Fig 6
Determine the focal length of the lens (2mks) - An optician in Eldoret Hospital examined an eye of a patient and made the following observations:
Eye too short and the focal length of the eye lens short- State the eye defect the patient could be having (1mk)
- Use a diagram to describe how the defect could be corrected (2mks)
- The graph below shows the variation of 1/v and 1/u in an experiment to determine the focal length of a lens
Fig 7- Use the graph to determine the focal length (3mks)
- What is the power of the lens used? (2mks)
- A converging lens forms an image which is three times the object Determine the focal length of the lens if the distance between the object and the screen is 80cm (3mks)
- Some students wish to determine the focal length of a convex lens of thickness 06cm using an optical pin and a plane mirror Figure 6 shows the experimental set up when there is no parallax between the pin and the image
-
- the figure below shows a ray of light PQ incident on air-water interface The ray strikes the bottom surface at M instead of N
The ray makes an angle of 40o at N and 54o at M with the horizontal- Determine;
- the angle of incidence (1mk)
- the angle of refraction (1mk)
- Calculate the refractive index of water (2mks)
- Determine;
- The figure below shows a beam of white light incident on a glass prism A thermometer with a blackened bulb is placed as shown After some time, the thermometer reading was observed to rise steadily
- Why is the bulb of the thermometer blackened? (1mk)
- Identify the colour that forms on the screen at points P and Q (2mks)
- Why did the reading of the thermometer rise? (1mk)
- the figure below shows a ray of light PQ incident on air-water interface The ray strikes the bottom surface at M instead of N
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