Recent questions in Physics Form 4

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The figure below shows the path of a radiation from a radioactive source moving in a magnetic field perpendicular

asked Jul 14, 2021 in Physics Form 4 by anony mous

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The figure below shows the common features of an x-ray tube.

asked Jul 14, 2021 in Physics Form 4 by anony mous

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State two factors that determine the speed of electrons emitted from a metal surface by light energy falling on it.

asked Jul 14, 2021 in Physics Form 4 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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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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Define centripetal acceleration.

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

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The figure below shows the cross-section of a diffusion cloud chamber used to detect radiation from radioactive sources.

asked Jul 8, 2021 in Physics Form 4 by anonymous

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The graph below shows radioactive decay of iodine.

asked Jul 8, 2021 in Physics Form 4 by anonymous

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A radioactive carbon-14 decays to nitrogen by beta particles as shown below.

asked Jul 8, 2021 in Physics Form 4 by anonymous

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An X-ray operates at 30000V and the current through it is 2mA. Given that the charge of an electron is 1.6 x 10-19C, h = 6.63 x 10-34JS, speed of light, C = 3.0 x 108m/s, calculate:-

asked Jul 8, 2021 in Physics Form 4 by anonymous

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State two advantages of using a Cathode Ray Oscilloscope (C.R.O) as a voltmeter over the ordinary voltmeter.

asked Jul 8, 2021 in Physics Form 4 by anonymous

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Sodium has a work function of 2.3eV. Given that: Planck’s constant h = 6.63 x 10-34JS, velocity of light in vacuum, C = 3.0 x 108m/s, 1 electron-volt (1eV) = 1.6 x 10-19 C and mass of an electron, me = 9.1 x 10-31kg, calculate:

asked Jul 8, 2021 in Physics Form 4 by anonymous

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State one factor which affects the rate of each of the above types of emission.

asked Jul 8, 2021 in Physics Form 4 by anonymous

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Distinguish between thermionic emission and photoelectric emission.

asked Jul 8, 2021 in Physics Form 4 by anonymous

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Explain how energy losses in a transformer are reduced by having:

asked Jul 8, 2021 in Physics Form 4 by anonymous

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A transformer has 800 turns in the primary and 40 turns in the secondary winding. The alternating e.m.f connected to the primary is 240V and the current is 0.5A

asked Jul 8, 2021 in Physics Form 4 by anonymous

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A bar magnet is moved into a coil of insulated copper wire connected to a centre-zero galvanometer, as shown in the figure below.

asked Jul 8, 2021 in Physics Form 4 by anonymous

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State Lenz’s a law of electromagnetic induction.

asked Jul 8, 2021 in Physics Form 4 by anonymous

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An object is placed 40cm in front of a concave lens of focal length 20cm; determine the position of the image.

asked Jul 8, 2021 in Physics Form 4 by anonymous

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You are given three resistors of values 5Ω, 8Ω and 12Ω. Show in a circuit diagram how you would connect them so as to give:

asked Jul 8, 2021 in Physics Form 4 by anonymous

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