Tag: heat and energy

Questions Related to heat and energy

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

physics heat and energy zeroth law of thermodynamics

  1. Heat gained by hot body

  2. Heat gained by cold body

  3. Both (a) and (b)

  4. None of these

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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

physics heat and energy zeroth law of thermodynamics

  1. Temperature

  2. Internal energy

  3. Work

  4. All of these

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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 $= 80\ cal/gm$)

physics heat and energy zeroth law of thermodynamics

  1. $0^{o}C$

  2. $-10^{o}C$

  3. $17.9^{o}C$

  4. $None$

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Correct Option: A

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

physics heat and energy zeroth law of thermodynamics

  1. $50^{\circ}C$

  2. $0^{\circ}C$

  3. $55^{\circ}C$

  4. $100^{\circ}C$

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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.

physics heat and energy zeroth law of thermodynamics

  1. True

  2. False

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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

physics heat and energy zeroth law of thermodynamics

  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

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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.

Which of the following is not a greenhouse gas?

physics heat and energy

  1. $H _2O \ (vapour)$

  2. $CFCs$

  3. $N _2$

  4. $O _3$

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Correct Option: C
Explanation:

In the given options,other than nitrogen gas,rest all the gases has the capability of trapping the heat rays reflecting from the earth.(they trap the heat rays because they have certain properties which are either enhanced or reduced due to heat)


Name of green house gases.

physics heat and energy

  1. methane

  2. oxygen

  3. nitrogen

  4. none of these

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Correct Option: A
Explanation:
  1. Carbon dioxide 
    2. Methane 
    3. Nitrous oxide 

Which of the following greenhouse gas is not present in very high quantity?

physics heat and energy

  1. methane

  2. ethane

  3. propane

  4. $CO _2$

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Correct Option: D
Explanation:

A greenhouse gas is a gas that absorbs and emits radiant energy within the thermal infrared range. Greenhouse gases cause the greenhouse effect on planets. The primary greenhouse gases in Earth's atmosphere are water vapour $(H _2O)$, carbon dioxide $(CO _2)$, methane $CH _4)$, nitrous oxide $(N _2O)$ and ozone $(O _3)$. Among the given gases, $CO _2$ is not present in very high quantity.

The extent that a greenhouse gas warms the Earth depends on:

physics heat and energy

  1. the length of time it remains in the atmosphere

  2. its ability to absorb energy

  3. both A and B

  4. none of these

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Correct Option: C
Explanation:

Scientists use these factors to calculate a gass global warming potential, which measures how much heat it absorbs per pound.