Highest voted questions

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A student designed a transformer to provide current to an electric bell marked 24W,6V from mains supply of 240V. He wound coils 50 turns and N turns on an iron ring. When he connected the coil of 50 turns to the bell and N turns to the a.c source he found out that the transformer was only 60% efficient. Find;

asked Jul 14, 2021 in Physics Form 2 by anony mous

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Who were the official that assisted mutapa in the administration of Shona kingdom during the precolonial period

asked Jul 13, 2021 in History Form 2 by BeatriceNeema

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The diagram below shows the path of light after striking two mirrors at an angle

asked Jul 13, 2021 in Physics Form 1 by anony mous

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Explain why a plain sheet of paper and a plane mirror both reflect light yet only the plane mirror forms images while the paper cannot form images.

asked Jul 13, 2021 in Physics Form 1 by anony mous

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Given a large source of light screen and a large object, sketch a ray diagram to show the shadow formed on the screen.

asked Jul 13, 2021 in Physics Form 1 by anony mous

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The figure below shows an electric circuit connected to a battery. If the internal resistance of the battery is 0.2Ω.

asked Jul 13, 2021 in Physics Form 3 by anony mous

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The figure below shows the displacement-time graph of a certain wave.

asked Jul 13, 2021 in Physics Form 2 by anony mous

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State one advantage of the circuit breaker over a wire fuse.

asked Jul 13, 2021 in Physics Form 1 by anony mous

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An immersion heater rated 4000W is used continuously for 1hour 30 minutes. Calculate the cost of operation at Ksh.6.70 per unit.

asked Jul 13, 2021 in Physics Form 3 by anony mous

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Describe briefly how an N-type and a P-type semi conductors are made.

asked Jul 13, 2021 in Physics Form 4 by anony mous

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State the function of ammonium chloride paste in a dry cell.

asked Jul 13, 2021 in Physics Form 1 by anony mous

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A convex lens forms an image three times the size of the object on a screen. If the distance between the screen and the object is 120cm. Determine;

asked Jul 13, 2021 in Physics Form 1 by anony mous

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Complete the ray diagram below, to show how a convex lens works as a magnifying glass.

asked Jul 13, 2021 in Physics Form 1 by anony mous

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The circuit below shows a torch bulb and lead plates dipped in dilute sulphuric acid and a battery of emf 12V.

asked Jul 13, 2021 in Physics Form 1 by anony mous

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The neutral identical aluminium spheres A and B are hanged freely such that they are in contact, as shown in the figure. A negatively charged rod is brought close to the spheres as shown.

asked Jul 13, 2021 in Physics Form 1 by anony mous

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The figure below shows an object placed in front of a plane mirror.

asked Jul 13, 2021 in Physics Form 1 by anony mous

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What is a machine?

asked Jul 13, 2021 in Physics Form 3 by anony mous

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An electric heater 1000W is used to heat 0.2kg of ice. Initially at -10°C to until all the mass changes to steam at 100°C.

asked Jul 13, 2021 in Physics Form 3 by anony mous

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The diagram below shows the main features of a domestic refrigerator. Study the diagram and answer the questions that follow.

asked Jul 13, 2021 in Physics Form 3 by anony mous

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Oil of density 800kgm-3 rests on the surface of water. A cube block of side 50mm floats by a distance of 37.5mm in the fresh water as shown in the figure.

asked Jul 13, 2021 in Physics Form 4 by anony mous

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