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When water is heated from 0° C to 20° C its volume:
  • a)
    first decreases and then increases
  • b)
    goes on increasing
  • c)
    remains constant up to 15°C and then increases
  • d)
    goes on decreasing
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
When water is heated from 0° C to 20° C its volume:a)first d...
When water is heated from 0°C, its volume decreases because its density increases and you can see this effect upto 4°C. Since the density of ice is maximum at 4°C, afterwards as the density decreases the volume increases. The main reason for this is hydrogen bond in ice gets cleaved due to the melting of ice.
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Most Upvoted Answer
When water is heated from 0° C to 20° C its volume:a)first d...
Explanation:

When water is heated from 0°C to 20°C, its volume does not increase uniformly. It first decreases and then increases. This can be explained by the anomalous expansion of water.

Anomalous Expansion of Water:

Water is an exception to the general rule that liquids expand on heating and contract on cooling. Water exhibits anomalous expansion, which means that it does not follow this general rule. The anomalous expansion of water can be explained by the following points:

- When water is heated from 0°C to 4°C, its volume decreases.
- This is because the water molecules are held together by hydrogen bonds, which are stronger at lower temperatures. As the temperature increases, these bonds start breaking and the water molecules start moving apart.
- However, when water is heated beyond 4°C, its volume starts increasing.
- This is because the thermal motion of the water molecules overcomes the hydrogen bonds and the water molecules start moving apart more rapidly.

Effect of Temperature on Water Volume:

Based on the above explanation, we can understand the effect of temperature on water volume as follows:

- When water is heated from 0°C to 4°C, its volume decreases.
- When water is heated from 4°C to 20°C, its volume increases.

Therefore, the correct answer is option 'A': first decreases and then increases.
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Community Answer
When water is heated from 0° C to 20° C its volume:a)first d...
When water is heated from 0 0C, its volume decreases because its density increases and you can see this effect upto 4 0C. Because the density of ice is maximum at 4 0C. Afterwards as the density decreases the volume increases. The main reason for this is hydrogen bond in ice gets cleaved due to the melting of ice.hope it will help
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Attempt All sub parts from each question.Newtonian and non-Newtonian fluid: Viscosity is the physical property that characterizes the flow resistance of simple fluids. Newton’s law of viscosity defines the relationship between the shear stress and shear rate of a fluid subjected to a mechanical stress. The ratio of shear stress to shear rate is a constant, for a given temperature and pressure, and is defined as the viscosity or coefficient of viscosity. Newtonian fluids obey Newton’s law of viscosity. The viscosity is independent of the shear rate. Example: air, water, alcohol etc. Non-Newtonian fluids do not follow Newton’s law thus, their viscosity (ratio of shear stress to shear rat e) is not constant and is dependent on the shear rate. Example: honey, ketchup etc. Non-Newtonian fluids can be categorized into four types based on the way a fluid’s viscosity changes in response to variations in shear rate.• Pseudoplastic: Materials whose viscosity decreases as the shear rate increases. This type of flow behavior is sometimes called shear thinning. Example: Cake batter, agar-agar and fruit juice concentrates, nail polish etc.• Dilatant: M aterials whose viscosity increases as the shear rate increases. This type of behavior is sometimes called shear-thickening. Example: Suspension of corn starch in water and candy compounds etc..• Thixotropic: M aterials whose viscosity decreases when sheared at a constant rate over time. Example: Yogurt, gelatin gel, honey etc.• Rheopectic: M aterials whose viscosity increases when sheared at a constant rate over time. Example: Printer ink, gypsum paste etc.Q. Viscosity of pseudoplastic non-Newtonian fluid

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When water is heated from 0° C to 20° C its volume:a)first decreases and then increasesb)goes on increasingc)remains constant up to 15°C and then increasesd)goes on decreasingCorrect answer is option 'A'. Can you explain this answer?
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