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- The graph below shows the variation of 1/v and 1/u in an experiment to determine the focal length of a lens.(Solved)
The graph below shows the variation of 1/v and 1/u in an experiment to determine the focal length of a lens.
![pic6920191133.png](/questions/uploads/pic6920191133.png)
(i) Use the graph to determine the focal length
(ii) What is the power of the lens used?
Date posted: September 6, 2019. Answers (1)
- An optician in Eldoret Hospital examined an eye of a patient and made the following observations:
Eye too short and the focal length of the eye...(Solved)
An optician in Eldoret Hospital examined an eye of a patient and made the following observations:
Eye too short and the focal length of the eye lens short
(i) State the eye defect the patient could be having.
(ii) Use a diagram to describe how the defect could be corrected.
Date posted: September 6, 2019. Answers (1)
- Some students wish to determine the focal length of a convex lens of thickness 0.6cm using an optical pin and a plane mirror.The figure shows...(Solved)
Some students wish to determine the focal length of a convex lens of thickness 0.6cm using an optical pin and a plane mirror.The figure shows the experimental set up when there is no parallax between the pin and the image.
![pic6920191123.png](/questions/uploads/pic6920191123.png)
Determine the focal length of the lens.
Date posted: September 6, 2019. Answers (1)
- Below is part of a circuit that was setup by form four students of Okok Seconday School during a physics practical lesson to demonstrate full...(Solved)
Below is part of a circuit that was setup by form four students of Okok Seconday School during a physics practical lesson to demonstrate full wave rectification using two diodes. Complete the circuit by correctly placing the load R and two diodes.
![pic6920191118.png](/questions/uploads/pic6920191118.png)
Date posted: September 6, 2019. Answers (1)
- A sample of a radioactive substance initially has 8.0 x 1025 particles. The half life of the sample is 98 seconds. Determine the number of...(Solved)
A sample of a radioactive substance initially has 8.0 x 1025 particles. The half life of the sample is 98 seconds. Determine the number of particles that will remain after 294 seconds.
Date posted: September 6, 2019. Answers (1)
- A form two student from Kimomo Secondary School found his dry cells leaking on removing from his torch. What would be the possible cause of...(Solved)
A form two student from Kimomo Secondary School found his dry cells leaking on removing from his torch. What would be the possible cause of the leakage?
Date posted: September 6, 2019. Answers (1)
- A vibrator is sending out 8 ripples per second across a ripple water tank. The ripples are observed to be 4cm apart. Calculate the velocity...(Solved)
A vibrator is sending out 8 ripples per second across a ripple water tank. The ripples are observed to be 4cm apart. Calculate the velocity of the ripples
Date posted: September 6, 2019. Answers (1)
- One of the factors that affect efficiency of a transformer is hysteresis losses. What is hyteresis losses?(Solved)
One of the factors that affect efficiency of a transformer is hysteresis losses. What is hyteresis losses?
Date posted: September 6, 2019. Answers (1)
- Give a reason why x-rays but not radio waves are used to detect fractured bones.(Solved)
Give a reason why x-rays but not radio waves are used to detect fractured bones.
Date posted: September 6, 2019. Answers (1)
- The following figure shows the path of a ray of light through a transparent material placed in air.(Solved)
The following figure shows the path of a ray of light through a transparent material placed in air.
![pic6920191051.png](/questions/uploads/pic6920191051.png)
Determine the refractive index of the transparent material
Date posted: September 6, 2019. Answers (1)
- The control grid in a cathode ray oscilloscope (CRO) is used to control the brightness of the beam on the screen. Explain how the brightness...(Solved)
The control grid in a cathode ray oscilloscope (CRO) is used to control the brightness of the beam on the screen. Explain how the brightness of the beam can be increased.
Date posted: September 6, 2019. Answers (1)
- A current of 0.7A flows through a wire when a potential difference of 0.35V is applied at the ends of the wire. If the wire...(Solved)
A current of 0.7A flows through a wire when a potential difference of 0.35V is applied at the ends of the wire. If the wire is 0.5m long and has a cross-sectional area of 8.0 x 103mm2, determine its resistivity.
Date posted: September 6, 2019. Answers (1)
- The figure below shows a positively charged metal plate with an earthing connection. State and explain the final charge of the plate.(Solved)
The figure below shows a positively charged metal plate with an earthing connection. State and explain the final charge of the plate.
![pic6920191035.png](/questions/uploads/pic6920191035.png)
Date posted: September 6, 2019. Answers (1)
- The figure below shows a load of 50N being raised by pulling it along an inclined plane of length 2.0m.(Solved)
The figure below shows a load of 50N being raised by pulling it along an inclined plane of length 2.0m.
![pic6920191026.png](/questions/uploads/pic6920191026.png)
Determine
i. The work done by the 22N force
ii. The work done against the load
iii. The efficiency of the system
Date posted: September 6, 2019. Answers (1)
- The figure below shows a buoy of capacity 40 litres and mass 10kg. It is held in position in sea water of
density 1.04g/cm3 by a...(Solved)
The figure below shows a buoy of capacity 40 litres and mass 10kg. It is held in position in sea water of
density 1.04g/cm3 by a light cable fixed to the bottom so that ¾ of its volume is below the water surface.
![pic6920191021.png](/questions/uploads/pic6920191021.png)
Determine the tension in the cable.
Date posted: September 6, 2019. Answers (1)
- The figure below shows a block with a graduated side and dimensions 4cm by 16cm, just about to be lowered
into a liquid in an overflow...(Solved)
The figure below shows a block with a graduated side and dimensions 4cm by 16cm, just about to be lowered
into a liquid in an overflow can.
![pic6920191009.png](/questions/uploads/pic6920191009.png)
During an experiment with this set-up, the following was recorded:
- The block floated with three-quarter of it submerged.
- Initial reading of balance = 0g
- Final reading of balance = 154g
Use the information to determine the density of
(i) the block
(ii) the liquid
Date posted: September 6, 2019. Answers (1)
- A bicycle wheel makes 300 revolutions per minute. Calculate the angular velocity of the wheel.(Solved)
A bicycle wheel makes 300 revolutions per minute. Calculate the angular velocity of the wheel.
Date posted: September 6, 2019. Answers (1)
- The figure below shows two masses 0.1kg and 2kg connected by a string through a hole on a smooth horizontal surface.The 0.1kg rotates in a...(Solved)
The figure below shows two masses 0.1kg and 2kg connected by a string through a hole on a smooth horizontal surface.
![pic692019948.png](/questions/uploads/pic692019948.png)
The 0.1kg rotates in a horizontal circle of radius 3cm. Calculate the angular velocity of the 0.1kg mass, when the system is in equilibrium.
Date posted: September 6, 2019. Answers (1)
- Three insoluble powders A, B and C of densities dA, dB and dC, such that dA>dB>dC, are mixed and put into a container.The container is...(Solved)
Three insoluble powders A, B and C of densities dA, dB and dC, such that dA>dB>dC, are mixed and put into a container.The container is then whirled in a horizontal circle as shown in the figure below.
![pic692019931.png](/questions/uploads/pic692019931.png)
(i) Label on the figure, the positions of the powders after some time.
(ii) Give a reason for your answer in (i)
Date posted: September 6, 2019. Answers (1)
- A ball slides off a horizontal table 4m high with a velocity of 12m/s, find;
(i) the time it takes to hit the floor. (g =...(Solved)
A ball slides off a horizontal table 4m high with a velocity of 12m/s, find;
(i) the time it takes to hit the floor. (g = 10ms-2)
(ii) the range
Date posted: September 6, 2019. Answers (1)