- A boy is standing between two cliffs A and B but nearer to cliff A than B. He stands 160m
from wall BA and shouts once....(Solved)
A boy is standing between two cliffs A and B but nearer to cliff A than B. He stands 160m
from wall BA and shouts once. He hears two echoes and discovers that the time between the
two echoes is 0.8 seconds. Determine how far the boy is standing from cliff B given that the
speed of sound in air is 340m/s
Date posted: April 4, 2019. Answers (1)
- A lady holds a large concave mirror of focal length 1.8m from her face. State two
characteristics of her image in the mirror(Solved)
A lady holds a large concave mirror of focal length 1.8m from her face. State two
characteristics of her image in the mirror
Date posted: April 4, 2019. Answers (1)
- An object is placed 12cm from a convex mirror of radius of curvature 20cm. Calculate
the position of the image(Solved)
An object is placed 12cm from a convex mirror of radius of curvature 20cm. Calculate
the position of the image
Date posted: April 4, 2019. Answers (1)
- By use of a ray; diagram, show how a concave mirror may be a dentist mirror(Solved)
By use of a ray; diagram, show how a concave mirror may be a dentist mirror
Date posted: April 4, 2019. Answers (1)
- The figure below shows an object placed in front of a plane mirror. Draw appropriate rays to
locate the image as seen by the observer.(Solved)
The figure below shows an object placed in front of a plane mirror. Draw appropriate rays to
locate the image as seen by the observer.
Date posted: April 4, 2019. Answers (1)
- Figure shows an object O being viewed using two inclined mirrors M1 and M2. Complete
the diagram by sketching rays to show the position of the...(Solved)
Figure shows an object O being viewed using two inclined mirrors M1 and M2. Complete the diagram by sketching rays to show the position of the image as seen by the eye -E.
Date posted: April 4, 2019. Answers (1)
- What is meant by the term spherical aberration?(Solved)
What is meant by the term spherical aberration?
Date posted: April 4, 2019. Answers (1)
- The figure below shows two mirrors inclined at an angle of 30o to each other. A ray of light is
incident on one mirror as shown(Solved)
The figure below shows two mirrors inclined at an angle of 30o to each other. A ray of light is
incident on one mirror as shown
Sketch the path of the ray to show its reflection on the two mirrors
Date posted: April 4, 2019. Answers (1)
- Complete the ray diagram to show the position of the image(Solved)
Complete the ray diagram to show the position of the image
Date posted: April 4, 2019. Answers (1)
- Complete the diagram below to show the shape of the wave fronts after passing the gap(Solved)
Complete the diagram below to show the shape of the wave fronts after passing the gap
Date posted: April 4, 2019. Answers (1)
- What is the relationship between periodic time and the frequency of a progressive wave?(Solved)
What is the relationship between periodic time and the frequency of a progressive wave?
Date posted: April 4, 2019. Answers (1)
- The figure below shows a magnetic material being magnetized(Solved)
The figure below shows a magnetic material being magnetized
Complete the diagram showing the windings on the magnetic material so as to produce polarities
at A and B both south poles
Date posted: April 4, 2019. Answers (1)
- A transformer supplies a current of 13.5A at a voltage of 48v to a device from a.c. main
supply of 240V. Given the transformer is 80%...(Solved)
A transformer supplies a current of 13.5A at a voltage of 48v to a device from a.c. main
supply of 240V. Given the transformer is 80% efficient; calculate
i) The power supplied to the transformer
ii) Current in the primary coil
Date posted: April 4, 2019. Answers (1)
- The figure below shows a diagram of a simple electric generator(Solved)
The figure below shows a diagram of a simple electric generator
i) Label the parts P and Q
ii) Identify the polarities of the poles X and Y
iii) State two ways of increasing the voltage – output in this generator
Date posted: April 4, 2019. Answers (1)
- Arrange the following types of waves in order of increasing frequency:-Ultra-violet radiation,
visible light, radio waves and x-rays(Solved)
Arrange the following types of waves in order of increasing frequency:-Ultra-violet radiation,
visible light, radio waves and x-rays
Date posted: April 4, 2019. Answers (1)
- The diagram below shows a ferromagnetic material being magnetized by the method shown(Solved)
The diagram below shows a ferromagnetic material being magnetized by the method shown
On the axes given below, sketch a graph to show how the strength of the magnet being created
varies with the number of strokes
Date posted: April 4, 2019. Answers (1)
- Suggest one method of decreasing the sensitivity of a moving coil meter(Solved)
Suggest one method of decreasing the sensitivity of a moving coil meter
Date posted: April 4, 2019. Answers (1)
- Using a well- labeled diagram explain how a moving coil meter works(Solved)
Using a well- labeled diagram explain how a moving coil meter works
Date posted: April 4, 2019. Answers (1)
- The resistance of a length of power transmitting cable is 20ohms and is used to transmit 12KV
at a current of 1A. If the voltage is...(Solved)
The resistance of a length of power transmitting cable is 20ohms and is used to transmit 12KV
at a current of 1A. If the voltage is stopped up to 18KV by a transformer, determine the
power loss. (Assume the transformer is ideal)
Date posted: April 4, 2019. Answers (1)
- State one way through which energy is lost in a transformer and give a remedy for it.(Solved)
State one way through which energy is lost in a transformer and give a remedy for it.
Date posted: April 4, 2019. Answers (1)