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9
MCQ (Multiple Correct Answer)

Mark the correct options

A
A system $X$ is in thermal equilibrium with $Y$ but not with $Z$. The systems $Y$ and $Z$ may be in thermal equilibrium with each other.
B
A system $X$ is in thermal equilibrium with $Y$ but not with $Z$. The systems $Y$ and $Z$ are not in thermal equilibrium with each other.
C
A system $X$ is neither in thermal equilibrium with $Y$ nor with $Z$. The systems $Y$ and $Z$ must be in thermal equilibrium with each other.
D
A system $X$ is neither in thermal equilibrium with $Y$ nor with $Z$. The systems $Y$ and $Z$ may be in thermal equilibrium with each other.
10
MCQ (Multiple Correct Answer)

Gulab namuns (assumed to be spherical) are to be heated in an oven. They are available in two sizes, one twice bigger (in radius) than the other. Pizzas (assumed to be discs) are also to be heated in oven. They are also in two sizes, one twice bigger (in radius) than the other. All four are put together to be heated to oven temperature. Choose the correct option from the following.

A
Both size gulab jamuns will get heated in the same time
B
Smaller gulab jamuns are heated before bigger ones
C
Smaller pizzas are heated before bigger ones
D
Bigger pizzas are heated before smaller
11
MCQ (Multiple Correct Answer)

Refer to the plot of temperature versus time (figure) showing the changes in the state if ice on heating (not to scale). Which of the following is correct?

A
The region $A B$ represent ice and water in thermal equilibrium
B
At $B$ water starts boiling
C
At $C$ all the water gets converted into steam
D
$C$ to $D$ represents water and steam in equilibrium at boiling point
12
MCQ (Multiple Correct Answer)

A glass full of hot milk is poured on the table. It begins to cool gradually. Which of the following is correct?

A
The rate of cooling is constant till milk attains the temperature of the surrounding
B
The temperature of milk falls off exponentially with time
C
While cooling, there is a flow of heat from milk to the surrounding as well as from surrounding to the milk but the net flow of heat is from milk to the surrounding and that is why it cools
D
All three phenomenon, conduction, convection and radiation are responsible for the loss of heat from milk to the surroundings
13
Subjective

Is the bulb of a thermometer made of diathermic or adiabatic wall?

Explanation

As diathermic walls allow exchange of heat energy between two systems and adiabatic walls do not, hence, diathermic walls are used to make the bulb of a thermometer.

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