Tag: physics

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Multiple choice physics heat and energy zeroth law of thermodynamics

Two bodies are in thermal equilibrium if they have same

  1. temperature

  2. amount of heat

  3. specific heat

  4. thermal capacity
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Thermal equilibrium means that there is no heat transfer going on between the bodies, which simply means that the bodies are at the same temperature. Heat content is a whole different concept - it is the amount of heat contained in a body, which is crucially dependent on mass. 

Multiple choice physics heat and energy zeroth law of thermodynamics

Two bodies A and B are said to be in thermal equilibrium with each other, if

  1. heat flows from A to B

  2. heat flows from B to A

  3. both the bodies lose equal amunts of heat to the atmosphere

  4. heat does not flow from either A or B
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Two bodies A and B are said to be in thermal equilibrium with each other, ifheat does not flow from either A or B 

Multiple choice physics heat and energy zeroth law of thermodynamics

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
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The given statement is the exact statement of Zeroth law of thermodynamics which deals with thermal equilibrium.

Multiple choice physics heat and energy zeroth law of thermodynamics

Three bodies $A, B$ and $C$ are in thermal equilibrium.
The temperature of $B$ is $45^{\circ}C$. Then the temperature of $'C'$ is _____

  1. $45^{\circ}C$
  2. $50^{\circ}C$
  3. $40^{\circ}C$

  4. Any temperature
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A, B and C are in thermal equilibrium and B is at temperature $45^0 C$, then according to zeroth law of thermodynamics both A and C will also be at temperature $45^0 C$.

Multiple choice physics heat and energy zeroth law of thermodynamics

If the output energy is$ 1000 J$ and input energy is $200 J $the net output is _____ $J$.

  1. $800$
  2. $1200$
  3. $10$
  4. $500$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The net output $=$ output - input
$= 1000 - 200 = 800 J$

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).