Like charges repel and unlike charges attract
johnmulu answered the question on February 7, 2017 at 07:10
- You are provided with a charged electroscope, an insulator and a conductor. Describe how you would use these apparatus to distinguish the insulator from the conductor(Solved)
You are provided with a charged electroscope, an insulator and a conductor. Describe how you would use these apparatus to distinguish the insulator from the conductor.
Date posted: February 7, 2017. Answers (1)
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State the reason why a convex mirror is preferred over a plane mirror for use as driving mirror.
Date posted: February 7, 2017. Answers (1)
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Explain why the images formed in a pin hole camera gets blurred when the hole is enlarged
Date posted: February 7, 2017. Answers (1)
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State the reason why when a ray of right strikes a mirror at 90o, the reflected ray travels along the a same path as the incident ray
Date posted: February 7, 2017. Answers (1)
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State the number of images formed when an object is between two plane mirror placed in parallel
Date posted: February 7, 2017. 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 is formed on the screen. Determine the height of the tree
Date posted: February 7, 2017. Answers (1)
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What is meant by virtual image?
Date posted: February 7, 2017. Answers (1)
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A vertical object placed on a bench is observed to have three shadows of different sharpness, in different directions. Explain this observation
Date posted: February 7, 2017. Answers (1)
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What property of light is suggested by the formation of shadows?
Date posted: February 7, 2017. Answers (1)
- The melting point of Oxygen is given as -281.3oC. Convert this temperature to Kelvin (K)(Solved)
The melting point of Oxygen is given as -281.3oC. Convert this temperature to Kelvin (K).
Date posted: February 6, 2017. Answers (1)
- 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. Answers (1)
- An electric heater is placed at equal distances from two similar metal cans A and B filled with water at room temperature(Solved)
An electric heater is placed at equal distances from two similar metal cans A and B filled with water at room temperature. The outer surface of can A is shiny while that of can B is dull black. State with reasons which can will be at higher temperature after the heater is switched on for some time.
Date posted: February 6, 2017. 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.
Date posted: February 6, 2017. Answers (1)
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Give reason why heat transfer by radiation is faster than heat transfer by conduction.
Date posted: February 6, 2017. 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.
Date posted: February 6, 2017. 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.
Date posted: February 6, 2017. Answers (1)
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Clinical thermometer has a constriction in the bore just above the bulb. State the use of this constriction.
Date posted: February 6, 2017. Answers (1)
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Give reason why water is not a suitable liquid for use in a barometer.
Date posted: February 6, 2017. 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.
Date posted: February 6, 2017. 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.
Date posted: February 6, 2017. Answers (1)