Anamolous Expansion of Water

Q.

How is rainwater different from sea water?

Q.

During extreme winters, water bodies such as lakes and rivers freeze forming a layer of ice on their top surface. How do fish and other aquatic animals manage to survive under such conditions?

Q. Ice floats over water as its density is less than that of water.

1. True
2. False

Q.

If a mixture of kerosene and water is left undisturbed for a while, which liquid comes to the bottom and which will be at the top?

1. Water comes to the top and kerosene at the bottom.

2. Water stays at the bottom and kerosene at the top.

3. Top - Kerosene; Middle - Water; Bottom - Kerosene.

4. Both get mixed well.

Q.

Which of the following statements are true?

(a) Water expands on heating from $4°\mathrm{C}$ to $40°\mathrm{C}$.

(b) Rubber contracts on heating.

(c) Water contracts on heating from $0°\mathrm{C}$ to $4°\mathrm{C}$.

(d) Water expands on freezing.

1. (b) is correct

2. (c) and (a) are false

3. Only (a) is correct

4. All are correct

Q.

The _________ of water enables aquatic animals to survive in a reservoir where the surface layer of water has frozen.

Q. Water is cooled from $4^{\circ }C$ to $0^{\circ }C$. It will:

1. contract
2. expand
3. first contract, then expand
4. first expand, then contract

Q. Water has the maximum density at $0^{\circ }C$.

1. True
2. False

Q. Which of the following is a suitable example for illustrating the law of conservation of mass? (Atomic mass of $O=16;H=1$)

1. $18$g of water is formed by the combination of $16$g oxygen with $2g$ of hydrogen
2. $18g$ of water in liquid state is obtained by heating $18$g of ice
3. $18$g of water is completely converted into vapour state n heating
4. $18$g of water freezes at $4^o$C to give same mass of ice

Q.

Illustrate the law of conservation of mass with an example.

Q. Fishes uses Dissolved oxygen in water.But, how the oxygen get dissolved in oxygen. Does the oxygen molecules react with water molecules

Q. When water gets converted into ice, its volume :

1. Increases
2. Decreases
3. No change
4. Can't be predicted

Q.

Does water expand with heat?

Q. Two gases found dissolved in natural water are

1. oxygen and carbon dioxide
2. hydrogen and oxygen
3. sulphur dioxide and hydrogen
4. chlorine and ammonia

Q. Explain why:
If distilled water is kept in a sealed bottle for a long time, it leaves etchings on the surface of the glass.

Q. Explain how Hope's apparatus can be used to demonstrate anomalous behaviour of water.

Q.

The colour, odour and taste of water is:

1. white, odourless, sweet
2. colourless, odourless, salted
3. colourless, odourless and tasteless
4. colourless, strong odour, sweet

Q.

In winters the average temperature of a city is $-1^{\circ }$C. There is a big lake in the middle of the city. The temperature in the lake, ____ with an increase in depth.

1. increases

2. decreases

3. remains same

4. increases then decreases

Q. Water droplets on grass and rocks is called:

1. Dew
2. Snow
3. Rain
4. Smog

Q. Name: A chemical used for loading.

Q. During summers, water kept in an earthen pot becomes cooler after some time. Which phenomenon leads to the cooling of water in an earthen pot?

1. Diffusion
2. Transpiration
3. Osmosis
4. Evaporation

Q.

At what temperature, the volume of a given amount of water is least for a given mass of water?

1. $0^{\circ }\text{C}$

2. $4^{\circ }\text{C}$

3. ${12}^{\circ }\text{C}$

4. $8^{\circ }\text{C}$

Q. Which of the following statement is not correct?

1. Density of ice is less than that of water
2. In winter season, ice formed on the surface of a lake provide thermal insulation
3. Ice is crystalline form of water
4. At atmospheric pressure, ice crystallizes in cubic form, but at very low temperatures, it condenses to a hexagonal form

Q. Match the List I with the List II.

Q. How does fishes and aquatic animals survive when the pond gets covered with thick ice?

Q. Every liquid consists of rotating polar moleculs or it is only in the case of water ??

Q. The density of water is not same at all temperatures because of its anomalous expansion. The density is maximum at:

1. $0^{\circ }C$
2. $4^{\circ }C$
3. ${40}^{\circ }C$
4. ${100}^{\circ }C$

Q. The consequences of the anomalous expansion of water are:

1. increasing mass of water.
2. bursting of water pipe’s during winter.
3. preservation of the aquatic life during the very cold weather.
4. icebergs floating on water.

Q. Ice has density less that $1gc{m}^{-3}$.

1. True
2. False