The mechanical disturbance due to hammering aligns the domains with the earth's magnetic field causing magnetization
johnmulu answered the question on February 9, 2017 at 09:40
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Distinguish between soft and hard magnetic materials
(Solved)
Distinguish between soft and hard magnetic materials
Date posted:
February 7, 2017
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Answers (1)
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Given a bar magnet, an iron bar and a string
i) Describe a simple experiment to distinguish between the magnet and the iron bar
(ii) State...
(Solved)
Given a bar magnet, an iron bar and a string
i) Describe a simple experiment to distinguish between the magnet and the iron bar
(ii) State with reasons the observations that would be made in the experiment.
Date posted:
February 7, 2017
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Answers (1)
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Give reason why attraction in magnetism is not regarded as reliable method of testing for polarity
(Solved)
Give reason why attraction in magnetism is not regarded as reliable method of testing for polarity
Date posted:
February 7, 2017
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Answers (1)
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State the reason for topping up a lead-acid accumulator with distilled water
(Solved)
State the reason for topping up a lead-acid accumulator with distilled water.
Date posted:
February 7, 2017
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Answers (1)
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State one advantage of a lead-acid accumulator over a nickel-iron(NiFe) accumulator
(Solved)
State one advantage of a lead-acid accumulator over a nickel-iron(NiFe) accumulator.
Date posted:
February 7, 2017
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Answers (1)
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A car battery requires topping up with distilled water occasionally. Explain why this is necessary and why distilled water is used
(Solved)
A car battery requires topping up with distilled water occasionally. Explain why this is necessary and why distilled water is used
Date posted:
February 7, 2017
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Answers (1)
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State two advantages of an alkaline battery over a lead acid battery
(Solved)
State two advantages of an alkaline battery over a lead acid battery.
Date posted:
February 7, 2017
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Answers (1)
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State two uses of a charged gold leaf electroscope
(Solved)
State two uses of a charged gold leaf electroscope.
Date posted:
February 7, 2017
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Answers (1)
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A positively charged sphere is suspended by an insulating thread. A negatively charged conductor is suspended near it
(Solved)
A positively charged sphere is suspended by an insulating thread. A negatively charged conductor is suspended near it. The conductor is first attracted, after touching the sphere it is repelled. Explain this observation
Date posted:
February 7, 2017
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Answers (1)
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A conductor is slowly brought near the cap of a positively charged electroscope. The leaf first collapses and then diverges
(Solved)
A conductor is slowly brought near the cap of a positively charged electroscope. The leaf first collapses and then diverges. State the charge on the conductor
Date posted:
February 7, 2017
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Answers (1)
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A positively charged rod is brought near the cap of a leaf electroscope. The cap is the earthed momentarily by touching with the finger
(Solved)
A positively charged rod is brought near the cap of a leaf electroscope. The cap is the earthed momentarily by touching with the finger. Finally the rod is withdrawn. The electroscope is found to be negatively charged. Explain how this charge is acquired.
Date posted:
February 7, 2017
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Answers (1)
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A highly negatively charged rod is gradually brought close to the cap of a positively charged electroscope
(Solved)
A highly negatively charged rod is gradually brought close to the cap of a positively charged electroscope. It is observed that the leaf collapses initially and then diverges. Explain the observation.
Date posted:
February 7, 2017
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Answers (1)
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In certain pinhole camera, the screen is 10cm from the pinhole. When the camera is placed 6 m away from a tree, a sharp image of the tree 16 cm high
(Solved)
In certain pinhole camera, the screen is 10cm from the pinhole. When the camera is placed 6 m away from a tree, a sharp image of the tree 16 cm high is formed on the screen. Determine the height of the tree
Date posted:
February 7, 2017
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Answers (1)
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In a vacuum flask the walls enclosing the vacuum are silvered on the inside. State the reason for this
(Solved)
In a vacuum flask the walls enclosing the vacuum are silvered on the inside. State the reason for this
Date posted:
February 6, 2017
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Answers (1)
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A wooden bench and a metal bench are both left in the sun for a long time. Explain why the metal bench feels hotter to touch
(Solved)
A wooden bench and a metal bench are both left in the sun for a long time. Explain why the metal bench feels hotter to touch.
Date posted:
February 6, 2017
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Answers (1)
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State two variables that must be controlled in an experiment for comparing the thermal conductivities of different metal rods of the same diameter
(Solved)
State two variables that must be controlled in an experiment for comparing the thermal conductivities of different metal rods of the same diameter.
Date posted:
February 6, 2017
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Answers (1)
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When a liquid is heated in a glass flask, its level at first falls then rises. Explain this observation
(Solved)
When a liquid is heated in a glass flask, its level at first falls then rises. Explain this observation.
Date posted:
February 6, 2017
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Answers (1)
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Clinical thermometer has a constriction in the bore just above the bulb. State the use of this constriction
(Solved)
Clinical thermometer has a constriction in the bore just above the bulb. State the use of this constriction.
Date posted:
February 6, 2017
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Answers (1)
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Explain why a glass container with thick walls is more likely to crack than one with a thin wall when a very hot liquid is poured into it.
(Solved)
Explain why a glass container with thick walls is more likely to crack than one with a thin wall when a very hot liquid is poured into it.
Date posted:
February 6, 2017
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Answers (1)
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Give a reason why a concrete beam reinforced with steel does not crack when subjected to changes in temperature
(Solved)
Give a reason why a concrete beam reinforced with steel does not crack when subjected to changes in temperature.
Date posted:
February 6, 2017
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Answers (1)