Get premium membership and access questions with answers, video lessons as well as revision papers.
- Find the power of a concave lens of a focal length 25 cm.(Solved)
Find the power of a concave lens of a focal length 25 cm.
Date posted: October 15, 2018. Answers (1)
- Explain the common eye defects and their corrections(Solved)
Explain the common eye defects and their corrections.
Date posted: October 15, 2018. Answers (1)
- Explain the uses of lenses on optical devices(Solved)
Explain the uses of lenses on optical devices
Date posted: October 15, 2018. Answers (1)
- Experiment to determine the focal length of a converging lens using the lens formula(Solved)
Experiment to determine the focal length of a converging lens using the lens formula
Date posted: October 15, 2018. Answers (1)
- The lens of a slide projector focuses on an image of height 1.5m on a screen placed 9.0 m from the projector. If the height...(Solved)
The lens of a slide projector focuses on an image of height 1.5m on a screen placed 9.0 m from the projector. If the height of the picture on the slide was 6.5 cm, determine, (a) Distance from the slide (picture) to the lens (b) Focal length of the lens
Date posted: October 15, 2018. Answers (1)
- The focal length of a converging lens is found to be 10 cm. How far should the lens be placed from an illuminated object to...(Solved)
The focal length of a converging lens is found to be 10 cm. How far should the lens be placed from an illuminated object to obtain an image which is magnified five times on the screen?
Date posted: October 15, 2018. Answers (1)
- An object is placed 12 cm from a converging lens of focal length 18 cm. Find the position of the image(Solved)
An object is placed 12 cm from a converging lens of focal length 18 cm. Find the position of the image
Date posted: October 15, 2018. Answers (1)
- An object 0.05 m high is placed 0.15 m in front of a convex lens of focal length 0.1 m. Find by construction, the position,...(Solved)
An object 0.05 m high is placed 0.15 m in front of a convex lens of focal length 0.1 m. Find by construction, the position, nature and size of the image. What is the magnification?
Date posted: October 15, 2018. Answers (1)
- A horizontal pipe of cross-sectional area 50 cm2 carries water at the rate of 0.20 litres per second. Determine the speed;
a) Of the speed of...(Solved)
A horizontal pipe of cross-sectional area 50 cm2 carries water at the rate of 0.20 litres per second. Determine the speed;
a) Of the speed of water in the pipe.
b) When the tube narrows to 20 cm2 at another point.
Date posted: October 12, 2018. Answers (1)
- Outline the equation of continuity(Solved)
Outline the equation of continuity.
Date posted: October 12, 2018. Answers (1)
- Explain the occurrence of streamline and turbulent flow? (Solved)
Explain the occurrence of streamline and turbulent flow?
Date posted: October 12, 2018. Answers (1)
- What is line of flow?(Solved)
What is line of flow?
Date posted: October 12, 2018. Answers (1)
- A girl claps her hands once at a distance 250 m from a vertical cliff. If the temperature in the surrounding is 5oC, how long...(Solved)
A girl claps her hands once at a distance 250 m from a vertical cliff. If the temperature in the surrounding is 5oC, how long does it take for her to hear the echo?
Date posted: October 12, 2018. Answers (1)
- A boy strikes a railway line (steel) with a hammer. If the speed of sound in steel is 5,200 m/s, determine the time taken for...(Solved)
A boy strikes a railway line (steel) with a hammer. If the speed of sound in steel is 5,200 m/s, determine the time taken for the sound to reach another boy 2.3 km down the railway line with his ear on the rail.
Date posted: October 12, 2018. Answers (1)
- What are the characteristics of sound waves?(Solved)
What are the characteristics of sound waves?
Date posted: October 12, 2018. Answers (1)
- The figure below illustrates part of the displacement-time graph of a wave travelling across water at a particular place with a velocity of 2 ms-1....(Solved)
The figure below illustrates part of the displacement-time graph of a wave travelling across water at a particular place with a velocity of 2 ms-1. Calculate the wave’s; (a) Amplitude (b) Frequency (f) (c) Wavelength
Date posted: October 12, 2018. Answers (1)
- A rope is displaced at a frequency of 3 Hz. If the distance between two successive crests of the wave train is 0.8 m, calculate...(Solved)
A rope is displaced at a frequency of 3 Hz. If the distance between two successive crests of the wave train is 0.8 m, calculate the speed of the waves along the rope.
Date posted: October 12, 2018. Answers (1)
- Outline the characteristics of waves(Solved)
Outline the characteristics of waves
Date posted: October 12, 2018. Answers (1)
- Define transverse and longitudinal pulses and waves giving suitable illustrations(Solved)
Define transverse and longitudinal pulses and waves giving suitable illustrations.
Date posted: October 12, 2018. Answers (1)
- Two identical springs, whose spring constant is 6.0 N/cm, are used to support a load of 60 N as shown below. Determine the extension of...(Solved)
Two identical springs, whose spring constant is 6.0 N/cm, are used to support a load of 60 N as shown below. Determine the extension of each spring.
Date posted: October 12, 2018. Answers (1)