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Solar Cooker...

Solar Cooker

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(a) With the help of a labelled diagram, explain the construction and working of a solar cooker. (b) Why is the solar cooker box painted black from inside ? (c ) Why is the solar cooker box covered with a glass sheet ?

Two students made box-type solar cookers separately. They both painted the insulated box with black colour from inside, the cooking pots were painted black from outside, and a plane mirror reflector was also attached. One of the students covered the solar cooker box with a transparent glass sheet but the other student covered the solar cooker box with a transparent plastic sheet. Which of the two solar cookers will be more efficient and why ?

Knowledge Check

  • Assertion: Large convex mirrors are used to concentrate sunlight to produce heat in solar :yes always cooker. Reason: Concave mirrors converges the light rays falling on it.

    A
    If both assertion and reason are true and reason is the correct explanation of assertion.
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
    C
    If assertion is true but reason is false.
    D
    If both assertion and reason are false.

  • Steam is present in a pressure cooker at 1.5 atm pressure and 150^(@)C . If the pressure cooker can withstand a maximum of 4 atm pressure and there is no provision of a weight atop the cooker then at what temperature will the cooker explode?

    A
    `1128^(@)C`
    B
    564K
    C
    `564^(@)C`
    D
    1128K

  • A pressure cooker works on the principle of

    A
    elevation of boiling point of water by apphcation of pressure.
    B
    making the food-grains softer by application of pressure.
    C
    making the food-grains softer by application of pressure and temperature.
    D
    keeping the food-grains inside steam for a longer time

    • Similar Questions

    Explore conceptually related problems

    The electromagnetic waves which are used in the working of solar water heaters and cookers are called.........

    Assertion. Cooking time is reduced in pressure cooker. Reason. Boiling point inside the pressure cooker is raised.

    Assertion : Cooking time is reduced in pressure cooker. Reason : Boiling point of water inside the pressure cooker is lowered.

    Assertion (A): Cooking time in pressure cooker is reduced. Reason (R ): The boiling point inside the pressure cooker is raised.

    Cooking is a fast in pressure cooker because

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