Phases of Matter

Q. Heat is supplied to a solid material at a constant rate. The variation of temperature of the material with heat input is as shown in the figure.The slope of DE represents

1. Latent heat of vaporization
2. Heat capacity of vapour
3. Latent heat of liquid
4. Inverse of heat capacity of vapour

Q. Heat is supplied to a solid material at a constant rate. The variation of temperature of the material with heat input is as shown in the figure.The slope of DE represents:

1. Latent heat of liquid
2. Latent heat of vaporization
3. Heat capacity of vapour
4. Inverse of heat capacity of vapour

Q.

A student heats a beaker containing ice and water. He measures the temperature of the beaker as a function of time and draws the following graph:

1. What does the curve ab represent?
2. What happens after 25mins?
3. What does the curve bc represent?
4. At what temperature and time does ice melt?

Q. A block of ice at $-{12}^{\circ }\text{C}$ is slowly heated and converted into steam at ${100}^{\circ }\text{C}$. Which of the following curves best represents this event?

1. 
2. 
3. 
4. 

Q. is called as dry ice.

1. Solid $C{O}_2$
2. Solid $N{O}_2$
3. Solid $H_2$

Q. The temperature above which we can't liquify the vapour of a substance is called .

1. Critical Temperature
2. Freezing Temperature
3. Boiling Temperature

Q. $1300J$ of heat energy is supplied to raise the temperature of $0.5kg$ of lead from ${20}^{\circ }C$ to ${40}^{\circ }C$. Calculate the specific heat capacity of lead.

1. $65Jk{g}^{-1}{K}^{-1}$
2. $260Jk{g}^{-1}{K}^{-1}$
3. $130Jk{g}^{-1}{K}^{-1}$
4. $1300Jk{g}^{-1}{K}^{-1}$

Q. Name the radiations which can be detected by a thermopile.

Q. A block of ice at $-{12}^{\circ }\text{C}$ is slowly heated and converted into steam at ${100}^{\circ }\text{C}$. Which of the following curves best represents this event?

1. 
2. 
3. 
4. 

Q. If mass - energy equivalence is taken ito acount, when water is cooled to form ice, the mass of water should

1. increase
2. decrease
3. remain unchanged
4. first increase then

Q. The specific latent heat of ice is 383 $J{g}^{-1}$

1. True
2. False

Q.

In a closed container of constant volume, the pressure of water exhibits an interesting dependence on temperature -

The point D (273.16 K, 0.006 atm) is called the triple point, Tp, of water, where all there phases coexist. What is the observed phase change when the temperature is increased from -10⁰C to +10⁰C, while maintaining a constant pressure of 0.006 atm?

1. Solid → Liquid

2. Liquid → Gas

3. Solid → Gas

4. Gas → Liquid

Q. Assertion :Latent heat of fusion of ice is $336000J{kg}^{-1}$. Reason: Latent heat refers to heat required to change of state without any change in temperature.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. A block of steel heated to ${100}^{\circ }C$ is left in a room to cool. Which of the curves shown in figure depicts the correct behaviour?

1. A
2. B
3. C
4. None of these

Q. A block of ice at $-{12}^{\circ }\text{C}$ is slowly heated and converted into steam at ${100}^{\circ }\text{C}$. Which of the following curves best represents this event?

1. 
2. 
3. 
4. 

Q. Cooling graphs are drawn for three liquids $a$, $b$ and $c$. The specific heat is maximum for liquid :

1. $a$
2. $b$
3. $c$
4. Same for all the liquids.

Q. A $75g$ ice cube is mixed to $450g$ of boiling water. Identify the reasons why the water stops boiling immediately:
I. Heat is melting the ice.
II. Condensation is occurring.
III. Phase change occurs

1. I only
2. II and III only
3. I, II, and III
4. II only
5. I and III only

Q. Phase equilibrium of matter means that the matter can exist in two different phases for given temperature and pressure.

1. False
2. True

Q.

In a closed container of constant volume, the pressure of water exhibits an interesting dependence on temperature -

The point D (273.16 K, 0.006 atm) is called the triple point, Tp, of water, where all there phases coexist. What is the observed phase change when the temperature is increased from -10⁰C to +10⁰C, while maintaining a constant pressure of 0.006 atm?

1. Liquid → Gas

2. Solid → Gas

3. Gas → Liquid

4. Solid → Liquid

Q. The temperature-time graph obtained when a hot liquid is allowed to cool, is likely to resemble

1. $A$
2. $B$
3. $C$
4. $D$