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    O Level Quiz

    Uploaded by

    Dora Aye
    1. A double-glazed window has two panes of glass separated by air. Thermal energy is transferred through the air layer by conduction and convection. The thickness of the air layer affects the amount of conduction and convection, as shown in a graph. 2. When a refrigerator is first turned on, the air in the icebox is cooled. This causes the air to become denser and sink to the bottom of the refrigerator. 3. The smallest amount of energy transfer occurs with an air layer thickness of 0.5 cm, because there is little convection at this thickness.

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    O Level Quiz

    Uploaded by

    Dora Aye
    156 views2 pages
    1. A double-glazed window has two panes of glass separated by air. Thermal energy is transferred through the air layer by conduction and convection. The thickness of the air layer affects the amount of conduction and convection, as shown in a graph. 2. When a refrigerator is first turned on, the air in the icebox is cooled. This causes the air to become denser and sink to the bottom of the refrigerator. 3. The smallest amount of energy transfer occurs with an air layer thickness of 0.5 cm, because there is little convection at this thickness.

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    O level physics

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    o Level Quiz

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    1. A double-glazed window has two panes of glass separated by air. Thermal energy is transferred through the air layer by conduction and convection. The thickness of the air layer affects the amount of conduction and convection, as shown in a graph. 2. When a refrigerator is first turned on, the air in the icebox is cooled. This causes the air to become denser and sink to the bottom of the refrigerator. 3. The smallest amount of energy transfer occurs with an air layer thickness of 0.5 cm, because there is little convection at this thickness.

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    156 views2 pages

    O Level Quiz

    Uploaded by

    Dora Aye
    1. A double-glazed window has two panes of glass separated by air. Thermal energy is transferred through the air layer by conduction and convection. The thickness of the air layer affects the amount of conduction and convection, as shown in a graph. 2. When a refrigerator is first turned on, the air in the icebox is cooled. This causes the air to become denser and sink to the bottom of the refrigerator. 3. The smallest amount of energy transfer occurs with an air layer thickness of 0.5 cm, because there is little convection at this thickness.

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    of 2

    1.

    A double-glazed window has two sheets of glass


    separated by a layer of air.
    Thermal energy is conducted and convected through the
    layer of air. The amount of conduction and convection
    varies with the thickness of the layer of air, as shown in
    the graph.

    2. When a refrigerator is switched on for


    the first time, the air surrounding the icebox is cooled.

    What happens to the density of this air and


    to its position inside the refrigerator?
    Which thickness of air produces the smallest energy
    transfer, and why?
    A 0.5 cm because there is little convection
    B 1.0 cm because the total thermal energy transfer
    is least
    C 1.5 cm because the total thermal energy transfer
    is small and conduction is low
    D 2.0 cm because there is little conduction
    3. A glass beaker contains water. When the
    centre of the base of the beaker is
    heated, a convection current is set up.

    4. Two metal boxes containing air are


    standing in a room. Box X is on top of a
    heater. Box Y is on a bench. The boxes
    are left for a long time.

    Which line in the table best describes the


    average speed of the molecules in the
    containers?
    Which statement explains this?
    A The conduction of water causes water
    molecules to sink to the bottom.
    B The expansion of water molecules causes
    them to rise to the surface.
    C The water above the heat source rises
    because it becomes less dense.
    D The water at the sides sinks because it
    becomes less dense.
    5. A person holds a glass beaker in one
    hand and fills it quickly with hot water. It
    takes several seconds before his hand
    starts to feel the heat.
    Why is there this delay?
    A Glass is a poor conductor of heat.
    B Glass is a good conductor of heat.
    C Water is a poor conductor of heat.
    D Water is a good conductor of heat.

    1 of 2

    6. Each of these flasks contains the same


    number of gas molecules. In which would
    the pressure be lowest?

    A.

    Flask 1 B. Flask 2 C. Flask 3 D. Flask 4


    (Class):________ (No):__________

    7. Conduction in liquids and gases is how


    much efficient than solids?
    A. less efficient than solids
    B. more efficient than solids
    C. equally efficient to solids
    D. efficiency may vary

    8. The conduction in liquids and gases is


    less efficient than
    solids because
    A. collision in liquids is more as compared to
    solids
    B. collision is less as compared to solids
    C. in liquids and gases, particles are in
    random motion
    D. in liquids and gases, particles are far
    apart
    10.
    Ture or False
    A good example of Charles Law is when a
    piece of metal expands in the heat

    9. Ture or False
    According to Charles Law, if you have a
    balloon inside a car at noon during a hot
    summer day the balloon molecules inside will
    increase in pressure.
    Answers:
    1.
    2.
    3.
    4.
    5.
    6.
    7.
    8.
    9.
    10.
    (Total 50 marks)
    11. A sample of argon has a volume of 0.43 cm 3 at 299K. At what temperature in degrees Celsius will it have a
    volume of 1 cm3. (15 marks)

    12. In a closed container at 1.0 atmosphere, the temperature of a sample of gas is raised from 300 K to 400 K.
    What will be the final pressure of the gas? (15 marks)

    13. Fill in the blanks. (20 marks)


    According to ________________'s law, if a sample of gas is kept at constant _______________, the volume
    increases if the temperature is _______________.
    The temperature -273 degrees C is called _______________ zero.

    2 of 2

    (Class):________ (No):__________

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