Thermal Equilibrium

Q.

Two bodies are said to be in thermal equilibrium if:

1. they have same temperature

2. they have same amount of heat energy

3. they have same mass

4. they are moving with same speed

Q.

Why Is Zeroth Law Called So?

Q.

Why do I feel hot, but my temperature is low?

Q.

The zeroth law of thermodynamics leads to the concept of

1. internal energy

2. heat content

3. pressure

4. temperature

Q.

Explain classical thermodynamics with an example.

Q.

If there is no exchange of heat between different systems then they are said to be in ___________ equilibrium.

Q.

Who came up with the second law of thermodynamics?

Q. Define thermal equilibrium.

Q.

A solid piece of lead experiences certain upthrust. The lead piece is then shaped into a hollow cube and placed in the same liquid. The upthrust acting on it :

1. increases

2. decreases

3. remains same

4. none of the above

Q.

What does the zeroth law of thermodynamics mean?

Q. If two systems are in thermal equilibrium, then they should have same temperature.

1. True
2. False

Q. Two bodies are in thermal equilibrium if they have same

1. temperature
2. amount of heat
3. specific heat
4. thermal capacity

Q. Does a body at ${20}^{o}C$ raise in a room, where the room temperature is ${35}^{o}C$? if yes, why does its temperature rise further?

Q. Two bodies are in thermal equilibrium if they have the same :

1. temperatures
2. specific heat
3. thermal capacity
4. amount of heat

Q.

While floating in a liquid, the apparent weight of a body is _____________.

Q.

5g of ice at $0^{o}C$ is mixed with 5 g of steam at ${100}^{o}C,$ what is the final temperature?

1. ${100}^{o}C$
2. ${50}^{o}C$
3. $0^{o}C$
4. None of these

Q.

A hot metallic piece is placed in tap water contained in a bucket. Heat will flow from_________to________.

Q. The variance defined by Zeroth law of thermodynamics is

1. Internal energy
2. Temperature
3. All of these
4. Work

Q. If two systems are in thermal equilibrium, then they should have same _________.

Q. Two bodies are said to be in the state of thermal equilibrium if there is no transfer of heat taking place between them. True or false.

1. True
2. False

Q. In thermal equilibrium concepts, heat lost by hot body is equal to

1. Heat gained by hot body
2. Heat gained by cold body
3. Both (a) and (b)
4. None of these

Q. System A is brought in thermal equilibrium with B and B is later brought in thermal equilibrium with C. Then,

1. A and C are not in thermal equilibrium
2. A and C are in thermal equilibrium
3. A , B , C are in thermal equilibrium
4. Cannot predict

Q. A cylinder is floating in two liquids ad shown in figure. Choose the correct options

1. Net force on cylinder by liquid $2$ is equal to the upthrust.
2. Net force on cylinder by liquid $1$ is zero.
3. Net force on cylinder by liquid $1$ is non-zero.
4. Net force on cylinder by liquid $2$ is more than the upthrust.

Q.

What is the normal human body temperature?

Q. Two rigid boxes containing different ideal gases are placed on a table. Box $A$ contains one mole of nitrogen at temperature $T_o$, while box $B$ contains one mole of helium at temperature $\left(7/3\right)T_o$. The boxes are then put into thermal contact with each other, and heat flows between them until the gases reach a common final temperature (Ignore the heat capacity of boxes).Then, the final temperature of gases, $T_f$, in the terms of $T_o$ is:-

1. $T_f=\frac{3}{7}{T}_0$
2. $T_f=\frac{7}{3}{T}_0$
3. $T_f=\frac{3}{2}{T}_0$
4. $T_f=\frac{5}{2}{T}_0$

Q. A mass $m_1$ of a substance of specific heat capacity $c_1$ at temperature $t_1$ is mixed with a mass $m_2$ of other substance of specific heat capacity $c_2$ at a lower temperature $t_2$. Deduce the expression for the temperature of the mixture. State the assumption made, if any.

1. $\frac{m_1{t}_1+m_2{t}_2}{m_1+m_2}$
2. $\frac{m_1{t}_1+m_2{t}_2}{m_1{c}_1+m_2{c}_2}$
3. $\frac{m_1{c}_1+m_2{c}_2}{m_1+m_2}$
4. $\frac{m_1{c}_1{t}_1+m_2{c}_2{t}_2}{m_1{c}_1+m_2{c}_2}$

Q. A thermodynamic system is said to be in thermal contact with another system if it can exchange:

1. energy through the process of heat transfer
2. energy through the process of work
3. matter
4. all of the above

Q. A cube of side 10 cm completely immersed in water experiences a buoyant force of 1000 N.Take $g=10m/s^2$

1. True
2. False

Q. Two systems in thermal equilibrium with a third system separately are in thermal equilibrium with each other.
The above statement is

1. First law of thermodynamics
2. Second law of thermodynamics
3. Third law of thermodynamics
4. Zeroth law of thermodynamics

Q. A faulty thermometer has its fixed points marked as $3^o$ and ${120}^o$. The temperature of a body measured by the faulty thermometer is ${80}^o$, Find the correct temperature of the body on Celsius scale:

1. ${36.5}^{o}C$
2. ${77.8}^{o}C$
3. ${25.8}^{o}C$
4. ${66.8}^{o}C$