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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.
(i) Use the graph to determine the focal length
(ii) What is the power of the lens used?
Date posted: September 6, 2019.
- 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.
- 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.
Determine the focal length of the lens.
Date posted: September 6, 2019.
- Hydrogen sulphide gas was bubbled through a solution of zinc nitrate for sometime.
(i) State the observations made.
(ii) Where should the experiment be carried out...(Solved)
Hydrogen sulphide gas was bubbled through a solution of zinc nitrate for sometime.
(i) State the observations made.
(ii) Where should the experiment be carried out and why?
Date posted: September 6, 2019.
- 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.
- The image of point A (-3, 4) under a translation, T is A¹ (2, -2).(Solved)
The image of point A (-3, 4) under a translation, T is A¹ (2, -2). If the image of a point B under
T is (0, -1). Find the coordinates of B.
Date posted: September 6, 2019.
- The volume of a sample of nitrogen gas at a temperature of 298k and 600 minHg pressures was 4.8 x 10-2m3
Calculate the temperature at which...(Solved)
The volume of a sample of nitrogen gas at a temperature of 298k and 600 minHg pressures was 4.8 x 10-2m3
Calculate the temperature at which the volume of the gas would be 3.2x102m3 if pressure is constant.
Date posted: September 6, 2019.
- Without using Mathematical tables or a calculator evaluate:(Solved)
Without using Mathematical tables or a calculator evaluate:
![q156920191117.png](/questions/uploads/q156920191117.png)
Date posted: September 6, 2019.
- A forex bureau buys and sells American dollars in Kenya shillings at the rate shown below.(Solved)
A forex bureau buys and sells American dollars in Kenya shillings at the rate shown below.
Buying........Selling
85.40..........86.00
An American tourist at the end of her tour in Kenya had Ksh.107500 which he converted to the dollar through the forex bureau. How many dollars did she get?
Date posted: September 6, 2019.
- 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.
- There are two grades of tea, grade A and grade B.(Solved)
There are two grades of tea, grade A and grade B. Grade A cost Kshs.80 per kg and grade B cost Ksh.60 per kg. In what ratio must the two grades be mixed order to produce a blend worth Ksh.75 per kg.
Date posted: September 6, 2019.
- 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.
- A solid hemisphere of radius 7cm has the same volume as a cube.(Solved)
A solid hemisphere of radius 7cm has the same volume as a cube. Find the length of the cube to 1 d.p.
Date posted: September 6, 2019.
- Ammonia gas is used to manufacture nitric (V) acid as shown below.(Solved)
Ammonia gas is used to manufacture nitric (V) acid as shown below.
(i) Name the catalyst used in the above process.
(ii) Identify compound U.
(iii) Write the equation for the reaction that took place in the absorption tower.
(iv) Ammonia and nitric (V) acid are used in the manufacture of ammonium nitrate fertilizer, calculate the amount of the fertilizer manufactured per day, if the daily consumption of ammonia is 2400kg. Assume that the factory is 100%
efficient. (N = 14, H = 1, O = 16).
Date posted: September 6, 2019.
- Martha has 26 coins whose total value is sh.205.(Solved)
Martha has 26 coins whose total value is sh.205. There are thrice as many Sh.10 coins as there are
Sh.20 coins. The rest are 50cts coins. Find the number of Sh.20 coins that Martha has.
Date posted: September 6, 2019.
- 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.
- Simplify:(Solved)
Simplify:
![q106920191059.png](/questions/uploads/q106920191059.png)
Date posted: September 6, 2019.
- 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.
- Line L1 passes through the points (-1, 3) and (3, -5).(Solved)
Line L1 passes through the points (-1, 3) and (3, -5). Line L2 is parallel to L1 and has a perpendicular
bisector at (-2, 4). Find the equation of the perpendicular bisector in the form ax + by = C
Date posted: September 6, 2019.
- 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.
- 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.
Determine the refractive index of the transparent material
Date posted: September 6, 2019.
- The diagram below shows an incomplete set-up used to prepare and collect ammonia gas.(Solved)
The diagram below shows an incomplete set-up used to prepare and collect ammonia gas.
(i) Name solid T.
(ii) Write an equation for the reaction that occurred when a mixture of solid T and calcium hydroxide was heated.
(iii) Complete the diagram to show how a dry sample of ammonia gas can be collected.
Date posted: September 6, 2019.
- In the triangle ABC below. AC = 8cm and BC = 5cm and angle BCA = 30°.(Solved)
In the triangle ABC below. AC = 8cm and BC = 5cm and angle BCA = 30°. Point D divides BC in the ratio 1: 4 and point E divides AC in the ratio 2: 3. Find the area of the quadrilateral ABDE.
![q86920191049.png](/questions/uploads/q86920191049.png)
Date posted: September 6, 2019.
- 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.
- Solve for x in 27x+1 - 33x+2 – 400 = 86.(Solved)
Solve for x in 27x+1 - 33x+2 – 400 = 86.
Date posted: September 6, 2019.
- 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.
- Determine the values of x that satisfy the following inequalities and show the solution on a number line.(Solved)
Determine the values of x that satisfy the following inequalities and show the solution on a number line.
![q56920191040.png](/questions/uploads/q56920191040.png)
Date posted: September 6, 2019.
- 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.
- In an experiment to determine the molar heat of reaction when zinc displaces copper, 0.4g of zinc powder were added to 25.0cm³ of 2.0M copper...(Solved)
In an experiment to determine the molar heat of reaction when zinc displaces copper, 0.4g of zinc powder were added to 25.0cm³ of 2.0M copper (II) sulphate solution. The temperature of copper (II) sulphate solution was 24ºC, while that of the mixture was 36ºC.
(i) Other than increase in temperature, state and explain the observations which were made during the reaction.
(ii) Calculate the heat change during the reaction. (Specific heat capacity of the solution = 4.2Jgˉ¹Kˉ¹ and the density of the solution = 1g/cm³.
(iii) Determine the molar heat of displacement of copper by zinc. (Zn = 65).
Date posted: September 6, 2019.
- Use reciprocal and square tables to calculate to 3 significant figures the value of:(Solved)
Use reciprocal and square tables to calculate to 3 significant figures the value of:
![q46920191031.png](/questions/uploads/q46920191031.png)
Date posted: September 6, 2019.