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(A) : Some times water pipes burst in se...

(A) : Some times water pipes burst in severe winter.
( R) : On freezing water expands due to anamolous expansion.

A

Both (A) and (R) are true and (R) is the correct explanation of (A)

B

Both (A) and (R) are true and (R) is not the correct explanation of (A)

C

(A) is true but (R) is false

D

Both (A) and (R) are false

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The correct Answer is:
A
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(A) : Aquatic animals, at bottom of water in a lake, survive in cold countries even when the surface is frozen. (R) : Due to anomalous expansion, the density of water is minimum at 4^(@)C

Most substances contract on freezing. However, water does not belong to this category. We know that water expands on freezing. Further, coefficient of volume expansion of water in the temperature range from 0^(0)C to 4^(0)C is negative and above 4^(0)C it is positive. This behaviour of water shapes the freezing of lakes as the atmospheric temperature goes down and it has an extremely important effect on plant and animal life in lakes. As the atmospheric temperature goes down. but it is still above 4^(0)C :

Most substances contract on freezing. However, water does not belong to this category. We know that water expands on freezing. Further, coefficient of volume expansion of water in the temperature range from 0^(0)C to 4^(0)C is negative and above 4^(0)C it is positive. This behaviour of water shapes the freezing of lakes as the atmospheric temperature goes down and it has an extremely important effect on plant and animal life in lakes. If the atmospheric temperature is below 0^(0)C :

Most substances contract on freezing. However, water does not belong to this category. We know that water expands on freezing. Further, coefficient of volume expansion of water in the temperature range from 0^(0)C to 4^(0)C is negative and above 4^(0)C it is positive. This behaviour of water shapes the freezing of lakes as the atmospheric temperature goes down and it has an extremely important effect on plant and animal life in lakes. As the atmospheric temperature goes below 4^(0)C :

Most substances contract on freezing. However, water does not belong to this category. We know that water expands on freezing. Further, coefficient of volume expansion of water in the temperature range from 0^(0)C to 4^(0)C is negative and above 4^(0)C it is positive. This behaviour of water shapes the freezing of lakes as the atmospheric temperature goes down and it has an extremely important effect on plant and animal life in lakes. Under fixed atmospheric conditions, if it takes 2 hr. to form a 1 cm thick layer of ice in a lake, time taken for the thickness of ice layer to grow further by 1 cm will be

Most substances contract on freezing. However, water does not belong to this category. We know that water expands on freezing. Further, coefficient of volume expansion of water in the temperature range from 0^(0)C to 4^(0)C is negative and above 4^(0)C it is positive. This behaviour of water shapes the freezing of lakes as the atmospheric temperature goes down and it has an extremely important effect on plant and animal life in lakes. If the atmospheric temperature is below 0^(0)C and ice begins to form at t = 0, thickness of ice sheet formed up to a time .t. will be directly proportional to

In cold countries, water does not freeze at the bottom of a lake in winter, on account of

(A) : The bob of a pendulum is immersed in non viscous liquid (denser than water) completely. Time period of pendulum increases. (R) : Effective acceleration due to gravity increases.

AAKASH SERIES-THERMAL PROPERTIES OF MATTER-EXERCISE-IB
  1. (A) : Thermal expansion of solids is due to the anharmonicity of the l...

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  2. (A) : In laying down a railway track a small gap is left between the e...

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  3. (A) : Some times water pipes burst in severe winter. ( R) : On freez...

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  4. (A) : When a strip made of iron and copper is heated it bends with iro...

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  5. (A) : Reading of temperature may be same on Fahrenheit and Kelvin scal...

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  6. (A) : Two bodies at the same temperature may contain different amount ...

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  7. (A) : A clinical thermometer is usually much shorter than a laboratory...

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  8. (A) : A hollow bottle retains its shape when heated. ( R) : When hol...

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  9. (A) : When a solid iron ball is heated, the percentage change in its v...

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  10. (A) : Real expansion of liquid does not depend upon material of contai...

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  11. (A) : If w(1),w(2),w(3) are the weights of given body in air, in water...

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  12. (A) : A vessel is filled, with water, up to brim at 4^(@)C. It over fl...

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  13. (A) : A block is floating on surface of water at 0^(@)C. As temperatur...

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  14. (A) : Aquatic animals, at bottom of water in a lake, survive in cold c...

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  15. (A) : Anamalous expansion of water is favorable for acquatic animals ...

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  16. (A) : When water at 4^(@)C is filled to the brim of a beaker, then it ...

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  17. (A) : At 4^(@)C the coefficient of expansion of water is zero. ( R) ...

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  18. (A) : A small stone is inside an ice block which floats in water. When...

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  19. (A) : When water is heated from 0^(@)C to 10^(@)C, its volume first de...

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  20. (A) : 10 litres of Benzene will weigh more in winter than in summer. ...

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