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State THREE differences between light waves and sound waves.
Date posted:
March 26, 2019
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A source generates 40 waves in a second. If the wavelength is 8.5 cm. Calculate the time taken to reach a wall 102 m from the source.
Date posted:
March 26, 2019
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State one effect that would be observed when water waves pass from deep to shallow water.
Date posted:
March 26, 2019
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Figure below shows the displacement – time graph for a certain wave
Determine the frequency of the wave?
Date posted:
March 26, 2019
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Outline the effects of aridity and desertification and the solutions to aridity and desertification.
Date posted:
March 26, 2019
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Two identical springs of spring constant 3N/cm are used to support a load of 30N as shown. Determine the extension of each spring.
Date posted:
March 26, 2019
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An experiment was performed to find out how the length L of a spiral spring varies with the compression force, F. The figure below shows the variation.
(i) Draw a diagram of a possible set up of the apparatus
(ii) Over which range of the force does the spring obey Hooker’s law?
(iii) Suggest a reason for the shape of the graph between 40N and 60N
Date posted:
March 26, 2019
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State FOUR reasons why the efficiency of an electric motor is always less than 100%
Date posted:
March 26, 2019
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With an aid of a diagram,discuss the climatic regions of Kenya.
Date posted:
March 26, 2019
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An un-insulated copper wire XY lies over the fixed wire A and B connected to a battery when the key in the circuit is closed, the wire XY experiences a force.
(i) In which direction does the wire XY- experience the force?
(ii) How do you determine the direction in (i) above
(iii) When is the force on the wire XY greatest?
(iv) What is the effect of reversing both the magnetic field and direction of flow of current?
(v) State TWO factors by which the force on XY can be decreased
Date posted:
March 26, 2019
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Explain the examples of Pseudo taxes.
Date posted:
March 26, 2019
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Highlight four disadvantages of tied shops.
Date posted:
March 25, 2019
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State five tropical hardwood trees found in Kenya.
Date posted:
March 25, 2019
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State the modification introduced in the modern buses so as to enhance stability
Date posted:
March 25, 2019
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State two factors that determine the stability of a vehicle
Date posted:
March 25, 2019
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What factors should be considered when siting a plant to manufacture sulphuric acid?
Date posted:
March 25, 2019
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Why are people who are maimed or have lost one leg provided with crutches?
Date posted:
March 25, 2019
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Why is it very difficult to open a door from a point too close to hinges?
Date posted:
March 25, 2019
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Sketch a diagram of a simple cell.
Date posted:
March 25, 2019
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The figure shows a device for closing a steam outlet
The area of the piston is 4.0 x 10-4 m2 and the pressure of the steam in the boiler
is 2.0 x 105Nm-2. Determine the weight W that just holds the bar in the horizontal
position shown.
Date posted:
March 25, 2019
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What mass of Lead (II) nitrate could contain 13g of Lead?
Date posted:
March 25, 2019
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How many calcium ions and chloride ions are in 1 mole of calcium chloride, CaCl2?.
Date posted:
March 25, 2019
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In an experiment, the diameter, of the patch was measured to be 200mm for an oil drop of radius 0.25mm. Determine the diameter of the molecule of the oil.
Date posted:
March 25, 2019
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Two pins are hanging from a magnet as shown in the diagram below.
Explain why they do not hang vertically downwards.
Date posted:
March 25, 2019
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Rates of diffusion of two gases A and B are in the ratio 2:1. If the molecular mass of gas A is 16g. Find the molecular mass of B.
Date posted:
March 25, 2019
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Two gases, A and B have densities of 0.18gdm-3 and 2.90gdm-3 respectively. If they diffuse under the same conditions, what are their relative rates of diffusion.
Date posted:
March 25, 2019
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The figure below shows a ray of light incident to the first of the two mirrors placed at an angle of 60°.
Complete the part of the ray after reflection from the mirrors.
Date posted:
March 25, 2019
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A gas of volume 2m³ at 27°C is cooled to -123°C, at constant pressure. What is its new volume?
Date posted:
March 25, 2019
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A block of length 80cm, cross sectional area 3.0cm² and density 1300kg/m³ is completely immersed in a liquid of density 1030kg/m³. Determine
i) The mass of the block.
ii) The weight of the block in the liquid.
Date posted:
March 25, 2019
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A stone of mass 1.2 kg is tied to a rope and whirled in a vertical circle of radius 3.2m with a speed of 6.32m/s. Calculate
i) The centripetal acceleration of the stone.
ii) The tension in the rope when the stone is at the highest point.
Date posted:
March 25, 2019