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- Figure below shows a coil of insulated wire wound on a horse shoe soft iron core AB and connected to a power supplyName the polarity...(Solved)
Figure below shows a coil of insulated wire wound on a horse shoe soft iron core AB and connected to a power supply
Name the polarity at;
A
B
Date posted: October 3, 2019.
- An object is placed 20cm in front of a concave mirror of focal length 10cm and another identical object is place 20cm infront of a...(Solved)
An object is placed 20cm in front of a concave mirror of focal length 10cm and another identical object is place 20cm infront of a plane mirror
(i) Give one similarity of the image formed.
(ii) Give one difference between the image formed.
Date posted: October 3, 2019.
- In figure below power dissipated by the 16? resistor is 8w, what is the power dissipated in 200?(Solved)
In figure below power dissipated by the 16Ω resistor is 8w, what is the power dissipated in 200Ω
Date posted: October 3, 2019.
- In an experiment to determine the half-life of the radioactive element,the following data was obtained.(Solved)
In an experiment to determine the half-life of the radioactive element,the following data was obtained.
(i) Plot a decay curve for the element
(ii) Estimate from your graph the half-life of the element
Date posted: October 2, 2019.
- Use a suitable equation to show this decay(Solved)
Radon nuclide 
decays to form polonium by emitting an alpha- particle use a suitable equation to show this decay
Date posted: October 2, 2019.
- Define background count(Solved)
Define background count
Date posted: October 2, 2019.
- The diagram below represents an X –ray tube. The anode is made up of copper metal and tungsten as the target.(Solved)
The diagram below represents an X –ray tube. The anode is made up of copper metal and tungsten as the target.
a) What are the functions of parts A and B.
b) Explain how X-rays are produced from the tube
c) Why is tungsten used for the target in the tube?
d) How can the quality of X-rays produced be controlled in the tube?
e) How can the quantity of the X-rays be increased?
Date posted: October 2, 2019.
- Determine the amount of current passing through the 2O resistor shown in the figure below(Solved)
Determine the amount of current passing through the 2Ω resistor shown in the figure below
Date posted: October 2, 2019.
- The figure below shows two ways of biasing a P-N junction(Solved)
The figure below shows two ways of biasing a P-N junction
(i) In which circuit will current flow?
(ii) Explain your answer in (i) above.
Date posted: October 2, 2019.
- The energy of a radiation is 3.8 x10-14 J.(Solved)
The energy of a radiation is 3.8 x10-14 J. Determine the wavelength of the radiation
( h = 6.63x10-34JS,C=3.0 x 108m/s)
Date posted: October 2, 2019.
- Arrange the following radiations in order of increasing wavelength(Solved)
Arrange the following radiations in order of increasing wavelength; Ultra-violet, Microwaves, Blue light, Yellow light
Date posted: October 2, 2019.
- Figure below shows an object at the bottom of a water container. Draw rays on the diagram to show the object as viewed from above. (Solved)
Figure below shows an object at the bottom of a water container. Draw rays on the diagram to show the object as viewed from above.
Date posted: October 1, 2019.
- A girl looks into a plane mirror 3 m in front of her and sees the image of the wall which is 2.5 m behind her. What...(Solved)
A girl looks into a plane mirror 3 m in front of her and sees the image of the wall which is 2.5 m behind her. What is the difference between the girl’s eyes and the image of the wall?
Date posted: October 1, 2019.
- It is observed that when a magnet breaks up into two, each of the pieces retains the characteristics of the original magnet. Explain(Solved)
It is observed that when a magnet breaks up into two, each of the pieces retains the characteristics of the original magnet. Explain
Date posted: October 1, 2019.
- The figure below shows a bimetallic strip made of copper and iron at room temperature
If copper expands more than iron. Identify A and B if...(Solved)
The figure below shows a bimetallic strip made of copper and iron at room temperature
If copper expands more than iron. Identify A and B if the bimetallic strip is placed in a refrigerator whose temperature is -700c.
Date posted: October 1, 2019.
- The figure below shows how volume of a given mass of water varies with temperature.
sketch a graph of density against Temperature.(Solved)
The figure below shows how volume of a given mass of water varies with temperature.
sketch a graph of density against Temperature.
Date posted: October 1, 2019.
- The following results were obtained in a experiment to verify Hooke’s law when a spring was extended by hanging various loads on it.
(I) Complete...(Solved)
The following results were obtained in a experiment to verify Hooke’s law when a spring was extended by hanging various loads on it.
(I) Complete the table for the extension e above.
(II) Plot a graph of load (y-axis) against extension
(III) From the graph determine the springs constant
(IV) Calculate the energy stored when the spring is stretched to 16 cm.
Date posted: October 1, 2019.
- A stone of mass 5g is released from a catapult. The catapult is stretched by 10cm. If the constant of elasticity is 100N/cm. Calculate;
(i)...(Solved)
A stone of mass 5g is released from a catapult. The catapult is stretched by 10cm. If the constant of elasticity is 100N/cm. Calculate;
(i) The horizontal velocity with which the stone is released
(ii) Sketch a graph of horizontal velocity against time from the time the stone is released to when it reaches the ground.
Date posted: October 1, 2019.
- The figure below shows the variation force with extension for a steel coil spring.
(i) On the same axes, sketch the variation of force with extension...(Solved)
The figure below shows the variation force with extension for a steel coil spring.
(i) On the same axes, sketch the variation of force with extension for a wire form which the spring is made.
(ii) Explain the difference between the two lines drawn
Date posted: October 1, 2019.
- The figure below shows a section of a tape from a ten tick timer whose frequency is 50 Hz.
Calculate;
(i) The average velocity of the...(Solved)
The figure below shows a section of a tape from a ten tick timer whose frequency is 50 Hz.
Calculate;
(i) The average velocity of the trolley between points
1. WX
2. YZ
(ii) Find the acceleration of the trolley.
Date posted: October 1, 2019.
- The velocity time graph in the figure below illustrates the motion of a ball which has been projected vertically upwards from the surface of...(Solved)
The velocity time graph in the figure below illustrates the motion of a ball which has been projected vertically upwards from the surface of a planet. The weight of the ball on earth is 30N
Determine the weight of a ball on the planet
Date posted: October 1, 2019.
- A modern car has a strengthened passenger cage but with front and back regions which can collapse in a crash. Explain how this collapsible...(Solved)
A modern car has a strengthened passenger cage but with front and back regions which can collapse in a crash. Explain how this collapsible regions should reduce injury in a car crash.
Date posted: October 1, 2019.
- State one way of making surface tension of water stronger.(Solved)
State one way of making surface tension of water stronger.
Date posted: October 1, 2019.
- Explain the washing effect of soap.(Solved)
Explain the washing effect of soap.
Date posted: October 1, 2019.
- A bullet of mass 10g travelling at a speed of 400ms-1 hits a tree trunk, it penetrates the tree trunk and stops inside the trunk...(Solved)
A bullet of mass 10g travelling at a speed of 400ms-1 hits a tree trunk, it penetrates the tree trunk and stops inside the trunk after 4 cm.
(a) Calculate the average resistance force offered by the trunk to the bullet.
(b) State the energy changes that takes place.
Date posted: October 1, 2019.
- Explain why a hole in a ship near the bottom is more dangerous than the one near the top(Solved)
Explain why a hole in a ship near the bottom is more dangerous than the one near the top
Date posted: October 1, 2019.
- The figure below shows a pith ball being lifted into the funnel by blowing air into the funnel
Explain this observation(Solved)
The figure below shows a pith ball being lifted into the funnel by blowing air into the funnel
Explain this observation
Date posted: October 1, 2019.
- A uniform metre rule of mass 40g is pivoted at the 60cm mark and held horizontally with a vertical string as shown below. Determine the...(Solved)
A uniform metre rule of mass 40g is pivoted at the 60cm mark and held horizontally with a vertical string as shown below. Determine the tension in the string.
Date posted: October 1, 2019.
- The figure below shows a bimetallic wheel whose diameter is not affected by changes in temperature. Briefly explain how the diameter of the wheel remain...(Solved)
The figure below shows a bimetallic wheel whose diameter is not affected by changes in temperature. Briefly explain how the diameter of the wheel remain unchanged as the temperature increases
Date posted: October 1, 2019.
- The figure below shows part of a vernier caliper when the jaws are closed without an object between the jaws
(a) What is the value of...(Solved)
The figure below shows part of a vernier caliper when the jaws are closed without an object between the jaws
(a) What is the value of the zero error of the callipers?
(b) A student used the same vernier calipers in (a) above to measure the diameter of a test tube whose actual diameter is 2.15cm. what was the reading shown by the calipers.
Date posted: October 1, 2019.