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The figure shows the circuit of a modern X-ray tube
(Solved)
The figure shows the circuit of a modern X-ray tube
Name the part labeled C and state its function
Date posted:
April 5, 2019
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Answers (1)
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An x-ray tube is operating with an anode potential of 12Kv and a current of 10.0m.A:
(Solved)
An x-ray tube is operating with an anode potential of 12Kv and a current of 10.0m.A:
(i) Calculate the number of electrons hitting the anode per second
(ii) Determine the velocity with which the electrons strike the target
Date posted:
April 5, 2019
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Answers (1)
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Three identical bulbs are connected in series with a battery of dry cells. At first the bulbs
shine brightly but gradually become dimmer. Using the same...
(Solved)
Three identical bulbs are connected in series with a battery of dry cells. At first the bulbs
shine brightly but gradually become dimmer. Using the same cells, explain how you
would increase the brilliance of the bulbs
Date posted:
April 5, 2019
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Answers (1)
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A girl opened up a used up dry cell and found the following:
i) The zinc casing was ‘eaten away’
ii) The cell was watery
(Solved)
A girl opened up a used up dry cell and found the following:
i) The zinc casing was ‘eaten away’
ii) The cell was watery
Name the cell defect
Date posted:
April 5, 2019
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Answers (1)
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State one reason why colour televisions have a higher power rating than black and white
televisions
(Solved)
State one reason why colour televisions have a higher power rating than black and white
televisions
Date posted:
April 5, 2019
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Answers (1)
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The figure shows a simple cell made of copper and zinc electrodes dipped in dilute
sulphuric acid
(Solved)
The figure shows a simple cell made of copper and zinc electrodes dipped in dilute
sulphuric acid.
a) Identify the cathode
b) If a voltmeter is connected across the rods the reading is observed to reduce with time.
State two causes of this observation
Date posted:
April 5, 2019
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Answers (1)
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The figure below shows the set up for a simple cell.
(Solved)
The figure below shows the set up for a simple cell.
a) Name the Electrode A and the solution B
b) State two reasons why the bulb goes off after a short time
Date posted:
April 5, 2019
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Answers (1)
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Distinguish between Topping and Dopping
(Solved)
Distinguish between Topping and Dopping
Date posted:
April 5, 2019
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Answers (1)
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Explain why eight 1.5V cells arranged in series to give a total of 12V cannot be used to start
a car. But car battery of 12V...
(Solved)
Explain why eight 1.5V cells arranged in series to give a total of 12V cannot be used to start
a car. But car battery of 12V starts a car
Date posted:
April 5, 2019
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Answers (1)
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Explain how conductivity of a semiconductor changes with increase in temperature
(Solved)
Explain how conductivity of a semiconductor changes with increase in temperature
Date posted:
April 5, 2019
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Answers (1)
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The diagram below shows a simple cell:-
(Solved)
The diagram below shows a simple cell:-
(i) Name z and solution y
(ii) Name and explain the defect that occurs at plate z
(iii) Give one method of preventing the defect that occurs at the copper plate
Date posted:
April 5, 2019
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Answers (1)
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The diagram below shows a wrongly wired three pin plug.
(Solved)
The diagram below shows a wrongly wired three pin plug.
(i) Indicate in the diagram above the correct colors for the wiring
(ii) State the use of device marked X
Date posted:
April 5, 2019
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Answers (1)
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The figure below represents part of an electric cooker coil.
(Solved)
The figure below represents part of an electric cooker coil.
i) State why the part labeled W is coiled
(ii) State the property of material X that makes it suitable for its use
Date posted:
April 5, 2019
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Answers (1)
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The diagram below represents a cathode ray oscilloscope (CRO)
(Solved)
The diagram below represents a cathode ray oscilloscope (CRO)
i) Name the parts labeled A and B
ii) What are the functions of C and D?
iii) State how electrons are produced
iv) Give a reason why the tube is evacuated.
Date posted:
April 5, 2019
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Answers (1)
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State one reason why a C.R.O is a more accurate voltmeter than a moving coil voltmeter
(Solved)
State one reason why a C.R.O is a more accurate voltmeter than a moving coil voltmeter
Date posted:
April 5, 2019
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Answers (1)
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An electric kettle is rated 3KW, 250V. Determine the resistance of the coil
(Solved)
An electric kettle is rated 3KW, 250V. Determine the resistance of the coil
Date posted:
April 5, 2019
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Answers (1)
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Given that a lamp is rated 45W 240V. Calculate the resistance of the heating element.
(Solved)
Given that a lamp is rated 45W 240V. Calculate the resistance of the heating element.
Date posted:
April 5, 2019
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Answers (1)
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What is the relationship between periodic time and frequency of a progressive wave?
(Solved)
What is the relationship between periodic time and frequency of a progressive wave?
Date posted:
April 5, 2019
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Answers (1)
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The figure below shows water waves crossing a boundary between deep and shallow water. Complete the diagram to show the wave in the deep region
(Solved)
The figure below shows water waves crossing a boundary between deep and shallow water
Complete the diagram to show the wave in the deep region.
Date posted:
April 5, 2019
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Answers (1)
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How many cubic centimeters make a gram?
(Solved)
How many cubic centimeters make a gram?
Date posted:
April 5, 2019
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Answers (1)