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Test: Vapour Pressure - Civil Engineering (CE) MCQ


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5 Questions MCQ Test - Test: Vapour Pressure

Test: Vapour Pressure for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Test: Vapour Pressure questions and answers have been prepared according to the Civil Engineering (CE) exam syllabus.The Test: Vapour Pressure MCQs are made for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Vapour Pressure below.
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Test: Vapour Pressure - Question 1

Which of the following statement is true about vapor pressure of a liquid?

Detailed Solution for Test: Vapour Pressure - Question 1

The vapor pressure of a liquid at a given temperature is given by the pressure ex-erted by the saturated vapor on the liquid surface. When the vapor is saturated, an equilibrium exists between the liquid and the vapor phases. The number of molecules leaving the liquid surface is equal to the number of molecules entering the liquid surface. Hence, it is obvious that vapor pressure will be related to molecular activity and consequently to temperature. With the increase in temperature molecular activity increases as a result of which vapor pressure increases.

Test: Vapour Pressure - Question 2

Which of the following is the condition for the boiling of a liquid?

Detailed Solution for Test: Vapour Pressure - Question 2

As the absolute pressure of a liquid goes below it’s vapor pressure, the formation of vapor bubbles start. Thus, for boiling to start, the absolute pressure of a liquid must be less than or equal to it’s vapor pressure.

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Test: Vapour Pressure - Question 3

The three liquids 1, 2, and 3 with vapor pressures V1, V2 and V3 respectively, are kept under same pressure. If V1 > V2 > V3, which liquid will start boiling early?

Detailed Solution for Test: Vapour Pressure - Question 3

A liquid starts to boil whenever it’s absolute pressure drops below it’s vapor pressure. Thus, the absolute pressure of liquid 1 will drop early, as a result it’ll start boiling early.

Test: Vapour Pressure - Question 4

Which of the following is correct regarding the formation and collapse of vapor bubbles in a liquid?

Detailed Solution for Test: Vapour Pressure - Question 4

Whenever the absolute pressure of a fluid drops below it’s vapor pressure, bubble formation starts. Again, when the fluid pressure goes above the bubble pressure, it’ll collapse. This is how cavitation formation takes place.

Test: Vapour Pressure - Question 5

Which of the following equation correctly depicts the relation between the vapor pressure of a liquid and it’s temperature?

Detailed Solution for Test: Vapour Pressure - Question 5

Vapor pressure is closely related to molecular activity which is in turn dependant on the temperature of the liquid. With the increase in temperature molecular activity of a vapor increases slowly at first and then rapidly. Similar is the nature of variaion of vapor pressure.

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