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0
votes
State how eddy currents are minimised in a transformer.
answered
Jun 21, 2021
in
Physics Form 1
electrostatics
0
votes
Figure 8 shows two straight conductors P and Q connected to a battery and a variable resistor.
answered
Jun 21, 2021
in
Physics Form 1
magnetism
electricity
magnetic effect of electric currents
0
votes
Figure 7 shows a soft iron ring placed between the poles of two bar magnets.
answered
Jun 21, 2021
in
Physics Form 2
magnetism
0
votes
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.
answered
Jun 21, 2021
in
Physics Form 4
photoelectric effect
0
votes
State one difference between the deflection systems of a cathode ray tube and the television tube.
answered
Jun 21, 2021
in
Physics Form 4
cathode rays
0
votes
Name the three components of the electron gun in a cathode ray tube.
answered
Jun 21, 2021
in
Physics Form 4
cathode rays
0
votes
Arrange the following electromagnetic waves in the order of decreasing frequency: Microwaves; Gamma rays; Radiowaves; X-rays.
answered
Jun 21, 2021
in
Physics Form 4
radioactivity
0
votes
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.
answered
Jun 21, 2021
in
Physics Form 4
radioactivity
0
votes
Figure 5 shows a radioactive element placed in an evacuated glass chamber. The element produces alpha, beta and gamma emissions.
answered
Jun 21, 2021
in
Physics Form 4
radioactivity
0
votes
The following is a nuclear reaction equation: 63Li+10n →31H +xyP Determine the values of x and y.
answered
Jun 21, 2021
in
Physics Form 4
radioactivity
0
votes
State two uses of radioactivity in medicine.
answered
Jun 21, 2021
in
Physics Form 4
radioactivity
0
votes
An object of height 10 cm is placed 30 cm from a converging lens of focal length 18 cm.
answered
Jun 21, 2021
in
Physics Form 2
reflections
curved surfaces
0
votes
An object is placed 8cm from a concave mirror whose radius of curvature is 20cm. Determine the position of the image.
answered
Jun 21, 2021
in
Physics Form 2
reflections
curved surfaces
0
votes
Describe how the focal length of a concave mirror can be determined using a screen and a metre rule.
answered
Jun 21, 2021
in
Physics Form 2
reflections
curved surfaces
0
votes
A consumer has the following appliances in the house:
answered
Jun 21, 2021
in
Physics Form 4
electronics
0
votes
An electric cooker is rated 2.5 kW, 250 V. State the meaning of these values
answered
Jun 21, 2021
in
Physics Form 4
electronics
0
votes
State two ways of minimising power losses during the transmission of electric power.
answered
Jun 21, 2021
in
Physics Form 1
electrostatics
electronics
0
votes
Figure 4 shows circular water waves incident on a plane reflector placed at an angle to the path of the waves.
answered
Jun 21, 2021
in
Physics Form 3
waves
0
votes
State the purpose of a fuse in an electrical circuit.
answered
Jun 21, 2021
in
Physics Form 1
cells
electrostatics
0
votes
Explain how x-rays are produced in the x-ray tube.
answered
Jun 21, 2021
in
Physics Form 4
x rays
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