Tag: changes in physical state - boiling, evaporation and condensation

Questions Related to changes in physical state - boiling, evaporation and condensation

Cycle tube when filled with an air, it swells up because of the pressure exerted by the particles of the air in the tube.

chemistry the particle theory atmospheric pressure and boiling point evaporation - factors and effects in daily life changes in physical state - boiling, evaporation and condensation

  1. True

  2. False

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Correct Option: A
Explanation:

Cycle tube when filled with the air it swells up because of the pressure exerted by the particles of the air present in the tube. The particles of air collide with each other and exert pressure on the walls of the tube.

Which of the following is not the unit of atmosperhic pressure?

chemistry the particle theory atmospheric pressure and boiling point evaporation - factors and effects in daily life changes in physical state - boiling, evaporation and condensation

  1. $Pascal$

  2. $N/m^2$

  3. $N/m$

  4. $76\ cm\ of\ Hg$

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Correct Option: C
Explanation:

The unit of the pressure is $pascal$. $N/m^2$, and $76\ cm\ of\ Hg$.

Here $N/m$ is the unit of the surface tension. 
Thus option C is the correct answer.

The atmospheric pressure remains unchanged throughout the earth's atmosphere.

chemistry the particle theory atmospheric pressure and boiling point evaporation - factors and effects in daily life changes in physical state - boiling, evaporation and condensation

  1. True

  2. False

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Correct Option: B
Explanation:

The atmospheric pressure changes throughout the atmosphere.
Example: As we go up in the air, the atmospheric decreases as the density of the air decreases. 

Usually the atmospheric pressure is equal to ___________.

chemistry the particle theory atmospheric pressure and boiling point evaporation - factors and effects in daily life changes in physical state - boiling, evaporation and condensation

  1. $1.013\times 10^{5}$ Pascal

  2. $1.013\times10^{5}N/m^2$

  3. $101.3\ kPa$

  4. all of the above

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Correct Option: D
Explanation:

The atmospheric pressure can be given as $1.013\times 10^{5}\ pascals$ or $1.013\times10^{5}\ N/m^2$.

Pressure can be measured by using Mercuric as well as Aneroid barometer.

chemistry the particle theory atmospheric pressure and boiling point evaporation - factors and effects in daily life changes in physical state - boiling, evaporation and condensation

  1. True

  2. False

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Correct Option: A
Explanation:

In 1643 Torricelli made an instrument for measuring atmospheric pressure. This device is called a barometer. This barometer can be either mercuric or aneroid barometer. 

In human body, the pressure exerted by the cells is ________ the atmospheric pressure.

chemistry the particle theory atmospheric pressure and boiling point evaporation - factors and effects in daily life changes in physical state - boiling, evaporation and condensation

  1. equal to

  2. more than

  3. slightly greater than

  4. greater than

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Correct Option: A
Explanation:

In the human body, the pressure exerted by the cells in our body is equal to the atmospheric pressure. Hence we do not get shrunk.