Rectilinear propagation (light travels in a straight line)
johnmulu answered the question on February 7, 2017 at 06:40
- 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)
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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)
- 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. Answers (1)
- 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. 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)
- One property of a liquid that is considered while constructing a liquid-in-glass thermometer is that the liquid expands more than the glass for the same temperature change(Solved)
One property of a liquid that is considered while constructing a liquid-in-glass thermometer is that the liquid expands more than the glass for the same temperature change. State any other two properties of the liquids that are considered.
Date posted: February 6, 2017. Answers (1)
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State why it is easier to separate water into drops than to separate a solid into smaller pieces
Date posted: February 6, 2017. Answers (1)
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In a smoke cell experiment to demonstrate Brownian motion, smoke particles are seen moving randomly. State the cause of the randomness
Date posted: February 6, 2017. Answers (1)
- A drop of blue ink is introduced at the bottom of a beaker containing water. It is observed that after sometime, all water in the beaker turns blue(Solved)
A drop of blue ink is introduced at the bottom of a beaker containing water. It is observed that after sometime, all water in the beaker turns blue. Name the process that takes place.
Date posted: February 6, 2017. Answers (1)
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A bottle containing a smelling gas is opened at the front bench of a classroom. State the reason why the gas is detected throughout the room.
Date posted: February 6, 2017. Answers (1)
- State the reason why it is easier to separate water into drops than to separate a solid into smaller pieces(Solved)
State the reason why it is easier to separate water into drops than to separate a solid into smaller pieces
Date posted: February 6, 2017. Answers (1)
- Two identical beakers A and B containing equal volumes of water are placed on a bench. The water in A is cold while in B it is warm(Solved)
Two identical beakers A and B containing equal volumes of water are placed on a bench. The water in A is cold while in B it is warm. Identical pieces of potassium permanganate are placed gently at the bottom of each beaker inside the water. It is observed that the spread of colour in B is faster than in A. Explain this observation
Date posted: February 6, 2017. Answers (1)
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Explain the difference between a liquid and a gas in terms of intermolecular distances and forces.
Date posted: February 6, 2017. Answers (1)
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Distinguish between solid and liquid states of matter in terms of intermolecular forces.
Date posted: February 6, 2017. Answers (1)