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All questions of Vapours for JAMB Exam
Which of the following weather phenomena is primarily associated with the formation of small water droplets suspended in the air?- a)Dew
- b)Mist
- c)Fog
- d)Rain
Correct answer is option 'B'. Can you explain this answer?
Which of the following weather phenomena is primarily associated with the formation of small water droplets suspended in the air?
a)
Dew
b)
Mist
c)
Fog
d)
Rain
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Deepak Iyer answered |
Mist is formed when small water droplets are suspended in the air, reducing visibility but not resulting in significant precipitation.
Which of the following statements accurately relates saturated vapour pressure (S.V.P) to boiling point?- a)Higher S.V.P corresponds to a lower boiling point.
- b)Higher S.V.P corresponds to a higher boiling point.
- c)S.V.P and boiling point are independent of each other.
- d)S.V.P and boiling point have an inverse relationship.
Correct answer is option 'A'. Can you explain this answer?
Which of the following statements accurately relates saturated vapour pressure (S.V.P) to boiling point?
a)
Higher S.V.P corresponds to a lower boiling point.
b)
Higher S.V.P corresponds to a higher boiling point.
c)
S.V.P and boiling point are independent of each other.
d)
S.V.P and boiling point have an inverse relationship.
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Deepak Iyer answered |
A higher saturated vapour pressure indicates a higher concentration of vapour molecules in equilibrium with the liquid phase, which leads to a lower boiling point.
The difference between dry bulb and wet bulb temperatures is a measure of:- a)Humidity
- b)Dew point
- c)Relative humidity
- d)Heat index
Correct answer is option 'A'. Can you explain this answer?
The difference between dry bulb and wet bulb temperatures is a measure of:
a)
Humidity
b)
Dew point
c)
Relative humidity
d)
Heat index
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|
Deepak Iyer answered |
The difference between dry bulb and wet bulb temperatures is a measure of humidity.
When does the formation of dew occur?- a)When the air temperature is higher than the dew point temperature.
- b)When the air temperature is lower than the dew point temperature.
- c)When the air is saturated with water vapour.
- d)When the air contains a high concentration of dust particles.
Correct answer is option 'B'. Can you explain this answer?
When does the formation of dew occur?
a)
When the air temperature is higher than the dew point temperature.
b)
When the air temperature is lower than the dew point temperature.
c)
When the air is saturated with water vapour.
d)
When the air contains a high concentration of dust particles.
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Deepak Iyer answered |
Dew forms when the air temperature drops below the dew point temperature, causing water vapour to condense on surfaces.
What causes the formation of fog?- a)Cooling of the air to its dew point near the ground.
- b)Condensation of water vapour at high altitudes.
- c)Evaporation of water droplets from the surface of a water body.
- d)Convection currents in the atmosphere.
Correct answer is option 'A'. Can you explain this answer?
What causes the formation of fog?
a)
Cooling of the air to its dew point near the ground.
b)
Condensation of water vapour at high altitudes.
c)
Evaporation of water droplets from the surface of a water body.
d)
Convection currents in the atmosphere.
|
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Deepak Iyer answered |
Fog is formed when the air near the ground is cooled to its dew point, leading to the condensation of water vapour.
How can the saturated vapour pressure be determined using the barometer tube method?- a)By measuring the height of the liquid column in the barometer tube.
- b)By measuring the volume of the gas phase in the barometer tube.
- c)By measuring the temperature of the liquid-vapour system.
- d)By measuring the rate of condensation of the vapour phase.
Correct answer is option 'A'. Can you explain this answer?
How can the saturated vapour pressure be determined using the barometer tube method?
a)
By measuring the height of the liquid column in the barometer tube.
b)
By measuring the volume of the gas phase in the barometer tube.
c)
By measuring the temperature of the liquid-vapour system.
d)
By measuring the rate of condensation of the vapour phase.
|
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Deepak Iyer answered |
The height of the liquid column in the barometer tube is directly related to the pressure exerted by the saturated vapours.
What is the purpose of the barometer tube method in determining saturated vapour pressure?- a)To measure the boiling point of a substance.
- b)To measure the density of saturated vapours.
- c)To measure the pressure exerted by the atmosphere.
- d)To measure the pressure exerted by the saturated vapours.
Correct answer is option 'D'. Can you explain this answer?
What is the purpose of the barometer tube method in determining saturated vapour pressure?
a)
To measure the boiling point of a substance.
b)
To measure the density of saturated vapours.
c)
To measure the pressure exerted by the atmosphere.
d)
To measure the pressure exerted by the saturated vapours.
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Deepak Iyer answered |
The barometer tube method is used to measure the pressure exerted by the saturated vapours, which corresponds to the saturated vapour pressure.
What is the formula for relative humidity (RH)?- a)RH = (vapor pressure)/(saturation vapor pressure) × 100%
- b)RH = (saturation vapor pressure)/(vapor pressure) × 100%
- c)RH = (dew point temperature)/(ambient temperature) × 100%
- d)RH = (ambient temperature)/(dew point temperature) × 100%
Correct answer is option 'A'. Can you explain this answer?
What is the formula for relative humidity (RH)?
a)
RH = (vapor pressure)/(saturation vapor pressure) × 100%
b)
RH = (saturation vapor pressure)/(vapor pressure) × 100%
c)
RH = (dew point temperature)/(ambient temperature) × 100%
d)
RH = (ambient temperature)/(dew point temperature) × 100%
|
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Deepak Iyer answered |
The formula for relative humidity is RH = (vapor pressure)/(saturation vapor pressure) × 100%.
What is the main characteristic that distinguishes saturated vapours from unsaturated vapours?- a)Saturated vapours have a higher temperature.
- b)Saturated vapours contain a higher concentration of molecules.
- c)Saturated vapours can exist in equilibrium with the liquid phase.
- d)Saturated vapours can only be produced at high pressures.
Correct answer is option 'C'. Can you explain this answer?
What is the main characteristic that distinguishes saturated vapours from unsaturated vapours?
a)
Saturated vapours have a higher temperature.
b)
Saturated vapours contain a higher concentration of molecules.
c)
Saturated vapours can exist in equilibrium with the liquid phase.
d)
Saturated vapours can only be produced at high pressures.
|
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Deepak Iyer answered |
Saturated vapours are in equilibrium with the liquid phase, meaning they have reached their maximum vapour pressure at a given temperature.
Which of the following units is used to measure humidity?- a)Celsius
- b)Kilograms
- c)Pascal
- d)Percentage
Correct answer is option 'D'. Can you explain this answer?
Which of the following units is used to measure humidity?
a)
Celsius
b)
Kilograms
c)
Pascal
d)
Percentage
|
|
Deepak Iyer answered |
Humidity is typically measured in percentage.
Wet bulb hygrometers are used to measure:- a)Absolute humidity
- b)Dew point
- c)Relative humidity
- d)Specific humidity
Correct answer is option 'C'. Can you explain this answer?
Wet bulb hygrometers are used to measure:
a)
Absolute humidity
b)
Dew point
c)
Relative humidity
d)
Specific humidity
|
|
Deepak Iyer answered |
Wet bulb hygrometers are used to measure relative humidity.
What is the main difference between humidity and relative humidity?- a)Humidity is measured in grams, while relative humidity is measured in percentage
- b)Humidity is a measure of water content, while relative humidity is a measure of air saturation
- c)Humidity is a measure of air temperature, while relative humidity is a measure of water vapor pressure
- d)Humidity and relative humidity are different terms for the same concept
Correct answer is option 'B'. Can you explain this answer?
What is the main difference between humidity and relative humidity?
a)
Humidity is measured in grams, while relative humidity is measured in percentage
b)
Humidity is a measure of water content, while relative humidity is a measure of air saturation
c)
Humidity is a measure of air temperature, while relative humidity is a measure of water vapor pressure
d)
Humidity and relative humidity are different terms for the same concept
|
|
Deepak Iyer answered |
Humidity measures water content, while relative humidity measures air saturation.
What is the dew point?- a)The temperature at which water vapor condenses into liquid water
- b)The temperature at which water freezes
- c)The temperature at which water boils
- d)The temperature at which water evaporates
Correct answer is option 'A'. Can you explain this answer?
What is the dew point?
a)
The temperature at which water vapor condenses into liquid water
b)
The temperature at which water freezes
c)
The temperature at which water boils
d)
The temperature at which water evaporates
|
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Deepak Iyer answered |
The dew point is the temperature at which water vapor condenses into liquid water.
Which of the following numerical expressions represents the boiling point of water at standard atmospheric pressure?- a)0°C
- b)100°C
- c)273 K
- d)212°F
Correct answer is option 'B'. Can you explain this answer?
Which of the following numerical expressions represents the boiling point of water at standard atmospheric pressure?
a)
0°C
b)
100°C
c)
273 K
d)
212°F
|
|
Deepak Iyer answered |
At standard atmospheric pressure, water boils at 100°C.
Which of the following numerical expressions represents saturated vapour pressure?- a)2 atm
- b)101 kPa
- c)0.1 N/m²
- d)760 mmHg
Correct answer is option 'D'. Can you explain this answer?
Which of the following numerical expressions represents saturated vapour pressure?
a)
2 atm
b)
101 kPa
c)
0.1 N/m²
d)
760 mmHg
|
|
Deepak Iyer answered |
The standard atmospheric pressure at sea level is equal to 760 mmHg, which represents the saturated vapour pressure.
Which of the following weather phenomena is primarily associated with the formation of larger water droplets that fall from the clouds?- a)Dew
- b)Mist
- c)Fog
- d)Rain
Correct answer is option 'D'. Can you explain this answer?
Which of the following weather phenomena is primarily associated with the formation of larger water droplets that fall from the clouds?
a)
Dew
b)
Mist
c)
Fog
d)
Rain
|
|
Deepak Iyer answered |
Rain occurs when larger water droplets fall from clouds due to gravitational force.
How is relative humidity related to the dew point?- a)Relative humidity is always equal to the dew point
- b)Dew point is always higher than the relative humidity
- c)Dew point is always lower than the relative humidity
- d)There is no direct relationship between the two
Correct answer is option 'C'. Can you explain this answer?
How is relative humidity related to the dew point?
a)
Relative humidity is always equal to the dew point
b)
Dew point is always higher than the relative humidity
c)
Dew point is always lower than the relative humidity
d)
There is no direct relationship between the two
|
|
Deepak Iyer answered |
Dew point is always lower than the relative humidity.
Which of the following is the formula for wet bulb depression?- a)Wet bulb depression = Wet bulb temperature - Dry bulb temperature
- b)Wet bulb depression = Dry bulb temperature - Wet bulb temperature
- c)Wet bulb depression = Wet bulb temperature + Dry bulb temperature
- d)Wet bulb depression = Dry bulb temperature / Wet bulb temperature
Correct answer is option 'A'. Can you explain this answer?
Which of the following is the formula for wet bulb depression?
a)
Wet bulb depression = Wet bulb temperature - Dry bulb temperature
b)
Wet bulb depression = Dry bulb temperature - Wet bulb temperature
c)
Wet bulb depression = Wet bulb temperature + Dry bulb temperature
d)
Wet bulb depression = Dry bulb temperature / Wet bulb temperature
|
|
Deepak Iyer answered |
Wet bulb depression = Wet bulb temperature - Dry bulb temperature.
Dry bulb hygrometers are used to measure:- a)Absolute humidity
- b)Dew point
- c)Relative humidity
- d)Specific humidity
Correct answer is option 'A'. Can you explain this answer?
Dry bulb hygrometers are used to measure:
a)
Absolute humidity
b)
Dew point
c)
Relative humidity
d)
Specific humidity
|
|
Deepak Iyer answered |
Dry bulb hygrometers are used to measure absolute humidity.
The wet bulb temperature is always:- a)Lower than the dry bulb temperature
- b)Higher than the dry bulb temperature
- c)Equal to the dry bulb temperature
- d)Unrelated to the dry bulb temperature
Correct answer is option 'A'. Can you explain this answer?
The wet bulb temperature is always:
a)
Lower than the dry bulb temperature
b)
Higher than the dry bulb temperature
c)
Equal to the dry bulb temperature
d)
Unrelated to the dry bulb temperature
|
|
Deepak Iyer answered |
The wet bulb temperature is always lower than the dry bulb temperature.
Chapter doubts & questions for Vapours - Physics for JAMB 2025 is part of JAMB exam preparation. The chapters have been prepared according to the JAMB exam syllabus. The Chapter doubts & questions, notes, tests & MCQs are made for JAMB 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests here.
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