Boiling Point and Melting Point

Q.

The boiling point of water in kelvin scale is?

Q.

Why does the temperature remain constant during boiling?

Q.

The melting point and the freezing point of a substance are equal. Why?

Q.

The boiling point of water is 373 K

1. True
2. False

Q.

In a new scale of temperature the lower fixed point is marked as $0$ corresponding to the melting point of substance which is equal to ${25}^{0}C$ and the upper fixed point is marked corresponding to the boiling point of a substance which is equal to ${175}^{0}C$. The total length of scale between the UFP and LFP is divided into $200$ equal parts. Determine the temperature in the new scale when the temperature of substance measured by celsius scale thermometer is ${50}^{0}C$.

Q.

Assertion: At the melting point temperature, both the solid and liquid state of a substance coexist.
Reason: At the melting point temperature, the two states of a substance can be interchanged.

1. Both assertion and reason are correct and reason is correct explanation for assertion.

2. Both assertion and reason are correct but reason is not correct explanation for assertion.

3. Assertion is correct but reason is incorrect.

4. Assertion is incorrect but reason is correct.

Q. An ice berg of density $900kg/m^3$ is floating in water of density $1000kg/m^3$. The percentage of volume of ice-cube outside the water is

1. $20\%$
2. $10\%$
3. $35\%$
4. $25\%$

Q.

Name the temperature at which a solid state of matter changes into its liquid state.

Q.

Define Vaporisation.

Q.

Melting point of ice is

1. 10⁰C

2. 100⁰C

3. 0⁰C

4. 90⁰C

Q.

The boiling point of water is :

1. 100 ^oC

2. 10 ^oC

3. 50 ^oC

4. 0 ^oC

Q.

The boiling point of water is

1. 0$°$C

2. 100$°$C

3. 150$°$C

4. none of these

Q.

which salt has the highest and the lowest melting and boiling points

Q.

Which of the following plays an important role when water is used as a coolant?

1. Specific heat capacity

2. Melting point

3. Boiling point

4. Density

Q.

In what manner does the boiling point affect when some salt is added to it?