Recent questions in Physics Form 4

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The figure below shows a block diagram of a p-n junction diode.

asked Jul 7, 2021 in Physics Form 4 by anonymous

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Arrange the following radiations in order of increasing wavelengths. Infrared, blue light, ultraviolet, radiowaves, x-rays.

asked Jul 7, 2021 in Physics Form 4 by anonymous

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A stone is whirled in a vertical circle as shown in the figure below using a string of length 40 cm. A, B, C and D are various positions of the stone in its motion. The stone makes 2 revolutions per second and has a mass of 100g.

asked Jul 7, 2021 in Physics Form 4 by anonymous

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A step down transformer has 600 turns in the primary coil. The input voltage is 120 V while the output voltage is 24 V. Determine the number of turns in the secondary coil.

asked Jun 21, 2021 in Physics Form 4 by anonymous

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Figure 6 shows a graph of stopping potential against the frequency for a certain photo emissive surface, drawn by a student from the data collected when carrying out an experiment on photoelectric effect.

asked Jun 21, 2021 in Physics Form 4 by anonymous

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State one difference between the deflection systems of a cathode ray tube and the television tube.

asked Jun 21, 2021 in Physics Form 4 by anonymous

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Name the three components of the electron gun in a cathode ray tube.

asked Jun 21, 2021 in Physics Form 4 by anonymous

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The half life of a certain radioactive substance is 24 days. Given that the initial sample of the substance has a mass of 64 g, determine the mass which is left after 72 days.

asked Jun 21, 2021 in Physics Form 4 by anonymous

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Arrange the following electromagnetic waves in the order of decreasing frequency: Microwaves; Gamma rays; Radiowaves; X-rays.

asked Jun 21, 2021 in Physics Form 4 by anonymous

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Figure 5 shows a radioactive element placed in an evacuated glass chamber. The element produces alpha, beta and gamma emissions.

asked Jun 21, 2021 in Physics Form 4 by anonymous

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The following is a nuclear reaction equation: 63Li+10n →31H +xyP Determine the values of x and y.

asked Jun 21, 2021 in Physics Form 4 by anonymous

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State two uses of radioactivity in medicine.

asked Jun 21, 2021 in Physics Form 4 by anonymous

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A consumer has the following appliances in the house:

asked Jun 21, 2021 in Physics Form 4 by anonymous

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An electric cooker is rated 2.5 kW, 250 V. State the meaning of these values

asked Jun 21, 2021 in Physics Form 4 by anonymous

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Explain how x-rays are produced in the x-ray tube.

asked Jun 21, 2021 in Physics Form 4 by anonymous

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Draw a diagram to show a p-n junction connected in the reverse bias mode.

asked Jun 21, 2021 in Physics Form 4 by anonymous

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