Tag: zeroth law of thermodynamics

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Questions Related to zeroth law of thermodynamics

Multiple choice physics heat and energy 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
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

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

So (B) is the correct option. 

Multiple choice physics heat and energy zeroth law of thermodynamics

The variance defined by Zeroth law of thermodynamics is

  1. Temperature

  2. Internal energy

  3. Work

  4. All of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Zeroth Law of Thermodynamics defines temperature as the property that determines whether two systems are in thermal equilibrium.

Multiple choice physics heat and energy zeroth law of thermodynamics

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. $None$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The heat required to warm 4g of ice from -10C to 0C is 20 cal. The heat required to melt 4g of ice is 320 cal. The heat available from 150g of water cooling from 20C to 0C is 3000 cal. Since the available heat is much greater than the heat required to melt the ice, the final temperature will be 0C with some ice remaining.

Multiple choice physics heat and energy zeroth law of thermodynamics

$1\ g$ 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. $100^{\circ}C$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

1g of steam at 100C releases 540 cal to condense and 100 cal to cool to 0C. 1g of ice at 0C requires 80 cal to melt. The steam has far more energy than needed to melt the ice, so the mixture will reach 100C.

Multiple choice physics heat and energy zeroth law of thermodynamics

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
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Thermal equilibrium is said to be achieved when there is no exchange of heat in the system.
Hence, OPTION : A (true).
Multiple choice physics heat and energy zeroth law of thermodynamics

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
Reveal answer Fill a bubble to check yourself
A Correct answer
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.