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A loudspeaker is a transducer. Explain.
Date posted:
September 12, 2019
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The figure below shows a tape from a trolley accelerating at 5m/s and the timer is vibrating at 100HZ.
(i) Change in velocity from A to B.
(ii) The final velocity of the trolley.
Date posted:
September 12, 2019
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Calculate the impulse of force produced when a table is pulled for 3 seconds by a constant force of 10N towards the right and then for 2 seconds by a constant force of 20N towards the left.
Date posted:
September 12, 2019
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A stone is thrown vertically upwards from the base of a mountain with an initial velocity of 100m/s. The stone just stopped as the apex and came back. Another boy projected a stone horizontally from the top of the mountain. Calculate:
(a) Height of the mountain.
(b) Time taken for the stone to follow the trajectory.
(c) The range if the horizontal velocity is 20m/s.
Date posted:
September 12, 2019
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A pipe of radius 2mm is connected to another pipe of radius 6mm. If water flows in the narrow pipe at a speed of 3m/s,determine the speed of water in the wider pipe.
Date posted:
September 12, 2019
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A spring extends by 4cm when a load of 10N is suspended from it. Six similar springs are used in the system shown in figure.Determine the total extension.
Date posted:
September 12, 2019
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On the axis on figure below, sketch displacement time graph for accelerating body.
Date posted:
September 12, 2019
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Under what conditions can a feather and a stone released from the same height land on the ground at the same time?
Date posted:
September 12, 2019
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The figure below shows a micrometer screw gauge that has a zero error of +0.02. State the actual reading of the micrometer screw gauge.
Date posted:
September 12, 2019
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The figure below shows a match stick floating on the surface of water in a basin.
When a drop of soap solution was carefully added to the water at A, the match stick is observed to move in a certain direction. State the direction of this match using A and B and explain this observation.
Date posted:
September 11, 2019
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An object is placed 15cm from a converging lens of focal length 20cm. calculate the image position.
Date posted:
September 11, 2019
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The refractive index of glass is 3/2 and that of water is 4/3. Calculate the refractive index of glass with respect to water.
Date posted:
September 11, 2019
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A heating element rated 2.5 KW is used to raise the temperature of 3.0 kg of water through 500C. Calculate the time required to effect this. (Specific heat capacity of water is 4200 J/kgK)
Date posted:
September 11, 2019
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The sketch below shows the p.d across a cell for various values of current through a resistance wire.
State and explain the significance of P
Date posted:
September 11, 2019
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A positively charged rod is brought close to two spheres A and B, held by insulating handles as shown below.
Indicate the charge on A and B
Date posted:
September 11, 2019
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The figure below shows a PN junction diode used in a rectifier.
i. What type of rectification is shown?
ii. Describe how the rectification is achieved.
iii. State two disadvantages of this rectification.
iv. In the space provided below, sketch the output signal displayed on the CRO during the rectification process.
Date posted:
September 11, 2019
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What do you understand by the term mutual induction?
Date posted:
September 11, 2019
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The figure below shows the cross-section of a ripple tank full of water. a piece of cork floats
on the surface of water and a straight edge vibrator placed at shallow end A to generate waves that travel to deep end B.
i. Name the type of wave generated on the water surface.
ii. The cork is observed to stay put despite passing water waves. Explain this observation.
iii. It was estimated that successive waves pass the cork every 0.25 seconds. If the speed of the waves is 0.28m/s, determine
the frequency and wave length of the waves at that point.
iv. Sketch the wavelength as viewed from a point above the ripple tank.
Date posted:
September 11, 2019
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The figure below shows two conducting wires A and B passing through a horizontal piece of cardboard.
(a) Sketch the resultant magnetic field patterns when the currents of the high magnitude are flowing in both wires as shown.
(b) What is the resulting effect of the field on the wires at the loose ends?
Date posted:
September 11, 2019
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Identify and explain two faults in the light circuit shown in the figure below.
Date posted:
September 11, 2019
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The figure below shows an arrangement of three components. If the total capacitance of the capacitors is 5μf, determine the value of X.
Date posted:
September 11, 2019
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The figure below shows the image formed when an object is placed in front of a concave lens.
Using suitable rays, locate the position of the object.
Date posted:
September 11, 2019
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In the circuit shown below, the battery has an e.m.f. of 6.6V and internal resistance of 0.3 ohms.
Determine the reading of the ammeter.
Date posted:
September 11, 2019
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The element of an electric hot plate has a resistance of 120 ohms. What is the energy dissipated when element is kept on for 10 minutes on a 240V supply?
Date posted:
September 11, 2019
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The figure below shows a rectangular block of wood attached to a spring balance being pulled gently by a pulling force P at a steady velocity.
i. A graph of pulling force against time was drawn as shown below.
I. State the forces FA and FB.
II. From the graph, state what happens to the block of wood between point P and Q. (1mk)
ii. Given that the wooden box has a mass of 2.0kg and requires force of 5N to pull it with uniform speed along a horizontal surface, calculate the coefficient of friction between the surface and the block. Take (g = 10N/kg).
Date posted:
September 11, 2019
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A stretched spring with a load attached to one end and fixed at the other is released as shown below.
Sketch on the same axis below the graph of potential energy and kinetic energy with time
Date posted:
September 11, 2019
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Figure below shows a wheel and axle of radius R and r respectively.
(a) Show that the velocity ratio of the system is given by 
(b) Given that r = 5cm, R = 20cm and an effort of 1200N is used to lift a load of 3000N. Determine:
i. The work done by effort to raise the load through a distance of 2m.
ii. The efficiency of the system.
iii. State two ways in which the efficiency in (ii) above can be increased.
Date posted:
September 11, 2019
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The figure below shows how water expands from lower temperatures.
On the axes below sketch a graph of density against temperature.
Date posted:
September 11, 2019
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You are provided with a metallic ball, a metallic ring and a source of heat. Describe how you would show that solids expand.
Date posted:
September 11, 2019
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An oil drop of radius 0.42mm when placed in water spreads out to form a circular patch of radius 42cm. using this information:
a. Estimate the size of the oil molecule.
b. State any one assumption you made in your calculation.
Date posted:
September 11, 2019