Tag: zeroth law of thermodynamics

Questions Related to zeroth law of thermodynamics

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


Correct Option: B
Explanation:

It is very clear that heat flows from hot body to cold body under general conditions. 

So (B) is the correct option. 

The variance defined by Zeroth law of thermodynamics is

  1. Temperature

  2. Internal energy

  3. Work

  4. All of these


Correct Option: A

Four cubes of ice at $-10^{o}C$ each one gm is taken out from the refrigerator and are put in $150\ gm$ of water at $20^{o} C$. The temperature of water when thermal equilibrium is attained. Assume that no heat is lost to the outside and water equivalent of container is $46\ gm$. (Specific heat capacity of water $=1\ cal/gm-\ ^{o}C$, Specific heat capacity of fusion of ice $=0.5 cal/gm-\ ^{o}C$, Latent heat of fusion of ice $= 80\ cal/gm$)

  1. $0^{o}C$

  2. $-10^{o}C$

  3. $17.9^{o}C$

  4. $None$


Correct Option: A

$1\ g$ of ice is mixed with $1\ g$ of steam. At thermal equilibrium, the temperature of the mixture is

  1. $50^{\circ}C$

  2. $0^{\circ}C$

  3. $55^{\circ}C$

  4. $100^{\circ}C$


Correct Option: D

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


Correct Option: A
Explanation:
Thermal equilibrium is said to be achieved when there is no exchange of heat in the system.
Hence, OPTION : A (true).

According to Hess's law, the thermal effects of a reaction depends on

  1. Initial and final conditions of the reacting substances

  2. Initial concentration of reactants

  3. Final conditions of the reacting substances

  4. Not on initial and final conditions of the reacting substance


Correct Option: A
Explanation:

According to Hess law, the thermal effects of a reaction depends upon the initial and final conditions of the reacting substances. It does not depend upon the immediate steps.