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State one similarity between “moment of force about a point” and “work done”
(Solved)
State one similarity between “moment of force about a point” and “work done”
Date posted:
May 30, 2019
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Answers (1)
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The figure below shows two balloons containing two different gases suspended on a rod. The set up is in equilibrium.
When the set up is moved...
(Solved)
The figure below shows two balloons containing two different gases suspended on a rod. The set up is in equilibrium.
When the set up is moved in hot sun the system tips to the right.
a) Compare expansivity of the gases A and B.
b) Explain your answer to (a) above.
Date posted:
May 30, 2019
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Answers (1)
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Explain why gases have larger intermolecular distances than solids.
(Solved)
Explain why gases have larger intermolecular distances than solids.
Date posted:
May 30, 2019
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Answers (1)
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The figure shows a U-tube connected to gas supply containing liquids L1 and L2 of densities 1.8gcm-3 and 0.8gcm-3 respectively in equilibrium.
Given that h1 =...
(Solved)
The figure shows a U-tube connected to gas supply containing liquids L1 and L2 of densities 1.8gcm-3 and 0.8gcm-3 respectively in equilibrium.
Given that h1 = 8cm, h2 = 10cm and atmospheric pressure is 1.02 x 105Pa. Determine the gas pressure.
Date posted:
May 30, 2019
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Answers (1)
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Give a reason why mercury is preferred for use in a thermometer.
(Solved)
Give a reason why mercury is preferred for use in a thermometer.
Date posted:
May 30, 2019
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Answers (1)
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The figure below shows a glass tube dipped in water inside a trough. The cross sectional area of the tube is 2cm2.
Determine the adhesive...
(Solved)
The figure below shows a glass tube dipped in water inside a trough. The cross sectional area of the tube is 2cm2.
Determine the adhesive force between water and glass. (Take density of water = 1000kgm-3, acceleration due to gravity =
10ms-2).
Date posted:
May 30, 2019
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Answers (1)
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The figure below shows a burette containing a liquid up to the level marked on the figure. 20 drops of the liquid are now run...
(Solved)
The figure below shows a burette containing a liquid up to the level marked on the figure. 20 drops of the liquid are now run out of the burette. If each drop has a volume of 1.1ml. Mark on the figure the new level of the liquid in the burette.
Date posted:
May 30, 2019
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Answers (1)
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A generator produces 0.1MW which is transmitted through a cable of resistance 10 ohms. If the potential difference produced is 5KV, calculate current transmitted.
(Solved)
A generator produces 0.1MW which is transmitted through a cable of resistance 10 ohms. If the potential
difference produced is 5KV, calculate current transmitted.
Date posted:
May 29, 2019
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Answers (1)
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Define the term ‘kilowatt hour’
(Solved)
Define the term ‘kilowatt hour’
Date posted:
May 29, 2019
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Answers (1)
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convex lens forms an image four times the size of the object on a screen. If the distance between the object and the
screen is...
(Solved)
A convex lens forms an image four times the size of the object on a screen. If the distance between the object and the
screen is 10cm.
Determine :
i) the image distance.
ii) focal length of the lens.
Date posted:
May 29, 2019
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Answers (1)
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A radio station is transmitting at a frequency of 15MHz. Calculate the wavelength of the transmission.
(Solved)
A radio station is transmitting at a frequency of 15MHz. Calculate the wavelength of the transmission.
Date posted:
May 29, 2019
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Answers (1)
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In a transformer, a voltage of 240V is to be stepped down to 24V. The primary current is found to be 1.5A while thesecondary current...
(Solved)
In a transformer, a voltage of 240V is to be stepped down to 24V. The primary current is found to be 1.5A while the
secondary current is 14A. Calculate :
i) Power input
ii) Power output
iii) Power wasted
iv) Efficiency of the transformer
Date posted:
May 29, 2019
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Answers (1)
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What is meant by the term “A.C rectification”.
(Solved)
What is meant by the term “A.C rectification”.
Date posted:
May 29, 2019
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Answers (1)
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In the nuclear equation below, find a and b
(Solved)
In the nuclear equation below, find a and b
Date posted:
May 29, 2019
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Answers (1)
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The figure below shows a Geiger Muller (GM) tube.
i) Name the part labelled A and B
ii) State one reason why halogen gas is used...
(Solved)
The figure below shows a Geiger Muller (GM) tube.
i) Name the part labelled A and B
ii) State one reason why halogen gas is used in the GM tube.
Date posted:
May 29, 2019
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Answers (1)
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In an experiment to determine the half life of thoron 220, the results were plotted as shown.
From the graph, determine the half life of thoron...
(Solved)
In an experiment to determine the half life of thoron 220, the results were plotted as shown.
From the graph, determine the half life of thoron 220.
Date posted:
May 29, 2019
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Answers (1)
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The figure below shows the deflection of radiation from a radioactive substance by an electric field.
Identify the radiations P, Q and R
(Solved)
The figure below shows the deflection of radiation from a radioactive substance by an electric field.
Identify the radiations P, Q and R
Date posted:
May 29, 2019
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Answers (1)
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The figure below shows a circuit diagram for a photocell.i) Explain why the milliammeter shows a deflection when ultraviolet light is shone on the photocell.ii)...
(Solved)
The figure below shows a circuit diagram for a photocell.
i) Explain why the milliammeter shows a deflection when ultraviolet light is shone on the photocell.
ii) Explain how the milliammeter reading is affected when the intensity of UV light is increased.
Date posted:
May 29, 2019
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Answers (1)
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a)The graph below shows the variation of stopping potential against frequency.
b) A certain metal has work function of 4.83eV. Calculate the maximum kinetic energy in...
(Solved)
The graph below shows the variation of stopping potential against frequency.
From the graph, determine Plank’s constant.
b) A certain metal has work function of 4.83eV. Calculate the maximum kinetic energy in joules of the electrons
emitted when the metal is irradiated with ultraviolet light of frequency 1.9 x 1015Hz. (Use Planks constant obtained
above.)
Date posted:
May 29, 2019
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Answers (1)
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The figure below shows four capacitors connected to a battery of 12 volts.
Calculate :
i) effective capacitance.
ii) charge on the capacitor of 3.2
iii) p.d across the...
(Solved)
The figure below shows four capacitors connected to a battery of 12 volts.
Calculate :
i) effective capacitance.
ii) charge on the capacitor of 3.2
iii) p.d across the capacitor of 5
iv) the energy stored by the capacitor of 2
Date posted:
May 29, 2019
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Answers (1)