Density and Anomalous Expansion of Water

Q.

What is the latent heat of fusion of ice in ${\mathrm{JKg}}^{-1}$?

Q.

Explain an activity to show the effect of change of temperature on the solid.

Q.

When we add soap to water, the surface tension of water _____.

1. Increases

2. decreases

3. increases then decreases

4. decreases then increases

Q.

Give reason:

Some empty space is left in sealed wine bottles.

Q.

Why does water have a maximum density of 4^oC?

Q.

What happens to the heat energy supplied to the solid once it starts melting?

Q.

Water expands below ___ and contracts above ___.

1. $4^{\circ }C,0^{\circ }C$

2. $4^{\circ }C,{10}^{\circ }C$

3. ${24}^{\circ }C,{10}^{\circ }C$

4. ${24}^{\circ }C,0^{\circ }C$

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. decreases

2. remains same

3. increases

4. increases then decreases

Q.

When water cools, first it expands in volume but below 4° C it starts contracting until it reaches 0° C.

1. True
2. False

Q. The density of water is maximum at .

1. 0 °C

2. 2 °C
3. 3 °C
4. 4 °C

Q.

The density of water is highest at ___ degree celsius.

1. 1

2. 2

3. 4

4. 3

Q. The temperature at which water gets converted to steam is known as its .

1. freezing point
2. melting point
3. boiling point