Questions by anonymous

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Under certain conditions, the carbon(IV) oxide concentration in the blood of a mammal rises above normal level. State two physiological changes that occur in the body to lower the carbon(IV) oxide back to normal.

asked Jul 8, 2021 in Biology Form 2

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Some sorghum seeds were soaked in water for two days. They were then broken into small pieces and placed on the surface of agar containing starch. After two days, it was found that the agar no longer contained starch.

asked Jul 8, 2021 in Biology Form 1

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Use the diagram below to answer the questions that follow.

asked Jul 8, 2021 in Biology Form 1

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Name the branch of biology that deals with the of the following

asked Jul 8, 2021 in Biology Form 1

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Name the branch of biology that deals with the of the following

asked Jul 8, 2021 in Biology Form 1

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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

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The graph below shows radioactive decay of iodine.

asked Jul 8, 2021 in Physics Form 4

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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

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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

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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

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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

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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

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Distinguish between thermionic emission and photoelectric emission.

asked Jul 8, 2021 in Physics Form 4

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

asked Jul 8, 2021 in Physics Form 4

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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

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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

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State Lenz’s a law of electromagnetic induction.

asked Jul 8, 2021 in Physics Form 4

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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

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The diagram below shows a certain defect of vision. Name the defect.

asked Jul 8, 2021 in Physics Form 1

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What do you understand by the term accommodation?

asked Jul 8, 2021 in Physics Form 1

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