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Explain why the surface of a lake freeze...

Explain why the surface of a lake freezes first.

Text Solution

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Lakes first freeze on the surface because water has the maximum density at `4^@C` and the densest part sinks to the bottom. So the water at the bottom of the lake remains at `4^@C` and that of top is at `0^@C`, where it freezes by losing heat to the environment.
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Statement-1: Upthurst on a solid block of iron when immersed in a lake will be less on the surface than on the bed of the lake. Statement-2: On the surface of the lake density of water will be less than that at the bed and upthrust depends on the density of liquid.

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Knowledge Check

  • Statement-1: Upthurst on a solid block of iron when immersed in a lake will be less on the surface than on the bed of the lake. Statement-2: On the surface of the lake density of water will be less than that at the bed and upthrust depends on the density of liquid.

    A
    Statement-1, is true, Statement-2 is true, Statement-2 is correct explanation for statement-1
    B
    Statement-1 is true, statement-2 is true, statement-2 is NOT a correct explantion for statement-1
    C
    statement-1 is true, statement-2 is false
    D
    statement-1 is false statement-2 is true

  • In cold weather, aquatic animals survive even when water to the top layer of the lake freezes into ice because

    A
    they can breathe in ice
    B
    they have enough of accumulated oxygen inside them
    C
    their body structure is such that they can survive without oxygen
    D
    water has highest density of `4^@C` so underneath the top layer of ice there is layer of water

  • The rapidly growing mass of phytoplankton covering the surface water of a lake or pond is known as :

    A
    Water pollution
    B
    Water hyacinth
    C
    Eutrophication
    D
    Water bloom
    • CENGAGE PHYSICS-CALORIMETRY-Exercise 1.3
    1. Explain why the surface of a lake freezes first.

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    2. In newton's law of cooling in the form (dDeltatheta)/(dt)=-kDeltathe...

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    3. A thermocole cubical icebox of side 30 cm has a thickness of 5.0 cm if...

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    4. A brass boiler has a base area of 0.15m^2 and thickness 1.0 cm it boil...

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    5. An electric heater is placed inside a room of total wall area 137 m^2...

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    6. An indirectly heated filament is radiating maximum energy of wavelengt...

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    7. A uniform copper bar 100 cm long is insulated on side, and has its end...

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    8. Two rods A and B of same length and cross-sectional area are connected...

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    9. Two conductors A and B given in previous problem are connected in para...

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    10. A sphere, a cube and a thin circular pate are heated to the same tempe...

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    11. One end of a brass rod of length 2.0 m and cross section 1cm^2 is kept...

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    12. Three rods AB, BC and BD having thermal conductivities in the ratio 1:...

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    13. Thermal conductivity of inner core of radius r is K and of the outer o...

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    14. A cylinder of radius R and length l is made up of substance whose ther...

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    15. A cube and a sphere of equal edge and radius, made of the same substan...

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    16. A spherical ball of radius 1cm coated with a metal having emissivity 0...

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    17. A body emits maximum energy at 4253 Å and the same body at some other ...

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    18. A black body at 1500K emits maximum energy of wavlength 20000Å. If sun...

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