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An armature composed of turns of insulated copper wire wound on a laminated soft- iron core is rotated in a magnetic field to generate an...
(Solved)
An armature composed of turns of insulated copper wire wound on a laminated soft- iron core is rotated in a magnetic field to generate an e.m.f. Use this information to answer the following questions.
(a) State two factors other than the speed of rotation that affect the magnitude of the e.m.f generated.
(b) State the reason why soft- iron is laminated.
Date posted:
March 26, 2019
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Answers (1)
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Figure below shows an electric generator. The points P and Q are connected to a Cathode Ray Oscilloscope (CRO).
(Solved)
Figure below shows an electric generator. The points P and Q are connected to a Cathode Ray Oscilloscope (CRO).
Sketch on the axes provided the graph of the voltage output as seen on the CRO, given that when t= 0, the coil is at the position shown in the figure.
Date posted:
March 26, 2019
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Answers (1)
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State characteristics of an image observed in a concave mirror when the object is between the focal point and the mirror.
(Solved)
State characteristics of an image observed in a concave mirror when the object is between the focal point and the mirror.
Date posted:
March 26, 2019
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Answers (1)
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Figure below shows the reading on a burette after 55 drops of a liquid have been used. If the initial reading was at zero mark,...
(Solved)
Figure below shows the reading on a burette after 55 drops of a liquid have been used. If the initial reading was at zero mark, determine the volume of one drop.
Date posted:
March 25, 2019
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Answers (1)
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A small object is placed 30cm away from a diverging lens of focal length 10cm. Determine by scale drawing the position and nature of image...
(Solved)
A small object is placed 30cm away from a diverging lens of focal length 10cm. Determine by scale drawing the position and nature of image formed.
Date posted:
March 25, 2019
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Answers (1)
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Name the part of the eye which changes the focal length of the eye.
(Solved)
Name the part of the eye which changes the focal length of the eye.
Date posted:
March 25, 2019
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Answers (1)
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A wire placed between the poles of two permanent magnets is connected to a galvanometer as shown below.
(Solved)
A wire placed between the poles of two permanent magnets is connected to a galvanometer as shown below.
a)State what is observed when the wire is moved up and down.
c) Suggest two ways of increasing the magnitude of the effect you have stated in (a) above.
Date posted:
March 25, 2019
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Answers (1)
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The figure below shows a P - N junction.
(Solved)
The figure below shows a P - N junction.
Complete the diagram so that the function is reverse biased.
Date posted:
March 25, 2019
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Answers (1)
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Fig 6 (a) and (b) shows a convex mirror and a plane mirror of equal aperture
(Solved)
Fig 6 (a) and (b) shows a convex mirror and a plane mirror of equal aperture
By sketching a pair of incident and reflected rays for each (a) and (b) shows how the convex mirror provides to the eye, a wide field of new than the plane mirror.
Date posted:
March 25, 2019
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Answers (1)
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The graph in the figure below shows a forward bias characteristics of a P-N junction.
(Solved)
The graph in the figure below shows a forward bias characteristics of a P-N junction.
The depletion layer decreases from O to A. Explain what is meant by depletion layer.
Date posted:
March 25, 2019
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Answers (1)
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The figure below shows two parallel rays incident on a concave mirror. F is the focal point of the mirror.
(Solved)
The figure below shows two parallel rays incident on a concave mirror. F is the focal point of the mirror.
On the same diagram sketch the path of the rays after striking the mirror
Date posted:
March 25, 2019
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Answers (1)
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Distinguish between intrinsic and extrinsic semi-conductors.
(Solved)
Distinguish between intrinsic and extrinsic semi-conductors.
Date posted:
March 25, 2019
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Answers (1)
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A doctor suspects that one of the kidneys of a patient is not working properly. The doctor injects him with a radioactive impurity, 1MBq of...
(Solved)
A doctor suspects that one of the kidneys of a patient is not working properly. The doctor injects him with a radioactive impurity, 1MBq of iodine-131 (half-life 8 days) which travels to his kidneys. A normal kidney gradually removes all impurity from the blood in about 20 minutes. The radioactivity in his kidney is monitored. using gamma ray detectors. The graph below shows the results.
a) Which kidney do you think is not working properly? Explain your answer.
b) Why do you think that a gamma ray emitter was used as the injected impurity instead of a beta emitter?
c) Why would it be less suitable to use as an impurity a material with a very short half-life?
Date posted:
March 25, 2019
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Answers (1)
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State the modification introduced in the modern buses so as to enhance stability
(Solved)
State the modification introduced in the modern buses so as to enhance stability
Date posted:
March 25, 2019
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Answers (1)
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State the necessary conditions for equilibrium of body which is acted upon by a number of forces
(Solved)
State the necessary conditions for equilibrium of body which is acted upon by a number of forces
Date posted:
March 25, 2019
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Answers (1)
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State two factors that determine the stability of a vehicle
(Solved)
State two factors that determine the stability of a vehicle
Date posted:
March 25, 2019
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Answers (1)
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What the term background radiation mean?
(Solved)
What the term background radiation mean?
Date posted:
March 25, 2019
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Answers (1)
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The figure shows zinc plate placed on the cap of a negatively charged electroscope. Ultraviolet radiation is made to fall on the plate.
(Solved)
The figure shows zinc plate placed on the cap of a negatively charged electroscope. Ultraviolet radiation is made to fall on the plate.
i) What happens the leaf of electroscope.
ii) What would happen if the radiation was red light.
Date posted:
March 25, 2019
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Answers (1)
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Figure below shows a solid cylinder standing on a horizontal surface. The cylinder is in stable equilibrium.
(Solved)
Figure below shows a solid cylinder standing on a horizontal surface. The cylinder is in stable equilibrium.
In the horizontal space provided, sketch the cylinders in neutral equilibrium
Date posted:
March 25, 2019
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Answers (1)
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Ultra violet radiation incident on zinc plate releases electrons from the zinc surface the energy of each incident photon is 5.4eV. Zinc has work fucntion...
(Solved)
Ultra violet radiation incident on zinc plate releases electrons from the zinc surface the energy of each incident photon is 5.4eV. Zinc has work fucntion fo 4.3eV.State the name given to this effect.
Date posted:
March 25, 2019
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Answers (1)