Physics · Geography

Atmospheric Physics and Humidity

878 Questions

Study the principles of atmospheric physics and humidity through these practice questions. Key subjects include the rate of evaporation, temperature inversions, and relative humidity measurements. These concepts are vital for geography and physics exams.

Evaporation and condensationRelative humidity conceptsAtmospheric pressure effectsTemperature inversion

Atmospheric Physics and Humidity Questions

Multiple choice business mathematics and statistics random variable and mathematical expectation discrete and continuous data random variable random variable and its types

State, which of the following variables are continuous and which are discrete :


Daily temperature of a city is continuous
If true then enter $1$ and if false then enter $0$

  1. Can't determine
  2. $0$
  3. $1$

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Temperature of a city can have any value including integers and rational numbers. Hence, it is a continuous variable.

Multiple choice botany environmental factors environmental factors and their measurements climate factors marine life

The following evidences rejected with atmospheric pressure theory. Which of them is incorrect ?

  1. It can raise water to height of 33 feet only if complete vaccum is created.

  2. Free surface of water is required for proper operation of atmospheric pressure because of transpiration.

  3. Pressure falls below that of atmospheric pressure because of transpiration.

  4. Water rises rapidly to compensate the water loss because of atmospheric pressure.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The question is poorly phrased, but option B is the most scientifically inaccurate statement regarding atmospheric pressure and transpiration in plants.

Multiple choice physics the kinetic model of matter evaporation heat, internal energy and work phase change

Rate of evaporation increases 

  1. with the rise in temperature

  2. with the fall in temperature

  3. irrespective of temperature

  4. only beyond room temperature
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Rate of evaporation Increases with the rise in temperature as increasing temperature increases the kinetic energy of molecules of the liquid which facilitates the molecule to convert into vapour.

Multiple choice physics the kinetic model of matter evaporation heat, internal energy and work phase change

Water evaporates under atmospheric pressure. Without changing the temperature, the same water is placed under partial vacuum. The rate of evaporation _________.

  1. increases

  2. drop to zero

  3. decreases

  4. remain unaffected
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
In partial pressure, the pressure is less;
According to Le-chatlier's principle on decreasing pressure; volume increases, so more water into gas(vapour)
So, rate of evaporation increases.
Multiple choice physics the kinetic model of matter evaporation heat, internal energy and work phase change

From the following which are the factors affecting the rate of evaporation?

  1. Temperature

  2. Humidity

  3. Exposed Surface Area

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

1. Temperature - If we increase the temperature of a liquid, its molecules get more kinetic energy and more molecules will come out rapidly from the surface of liquid i.e. rate of evaporation increases.


2. Humidity - Humidity is measurement of amount of vapour present in air. If humidity is high, it will be difficult for liquid to add more vapour in air as there is already high amount of vapour, therefore with increase in humidity, rate of evaporation decreases and vice- versa.


3. Exposed surface area - If exposed surface area is increased, more liquid molecules come on the surface, as evaporation is a surface process, therefore rate of evaporation increases.

Hence, all these factors affect the rate of evaporation.
Multiple choice physics the kinetic model of matter evaporation heat, internal energy and work phase change

State True or False :
Evaporation takes place at all temperatures.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

True, Evaporation takes place at any temperature. When the air molecule strike the surface, they are going to impart some energy to water molecules. If this energy is sufficient enough to change the phase of water molecules; we experience a phenomenon evaporation. It can occur at any temperature.

Multiple choice physics the kinetic model of matter evaporation heat, internal energy and work phase change

Which of the following does not affect the rate of evaporation?

  1. Pressure on evaporating substance

  2. Exposed surface area of the evaporating substance

  3. Shape of the evaporating substance

  4. Temperature
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Evaporation is a process in which some molecules of a liquid, which have greater kinetic energy, escape from the liquid and enter the atmosphere.

If pressure is greater, the molecules need greater energy to overcome the pressure and hence evaporation decreases with increase in pressure.
Due to more surface area, more molecules get a chance to escape, hence faster is the evaporation.
At higher temperature, molecules have greater kinetic energy, hence can easily escape the liquid.
But shape of the surface of the liquid doesn't affect evaporation.

Multiple choice physics the kinetic model of matter evaporation heat, internal energy and work phase change

Why skin feels dry in an air-conditioned room?

  1. Because the rate of evaporation decreases with lower humidity.

  2. Because the rate of evaporation increases with lower humidity.

  3. Because the rate of evaporation remains same with lower humidity.

  4. Because the rate of evaporation increases with higher humidity.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Evaporation is a process in which some molecules of a liquid, which have greater kinetic energy, escape from the liquid and enter the atmosphere.

When the humidity is lower, the air's capacity to absorb vapour is greater. The adhesive force of attraction between liquid molecules increases and more molecules escape into the atmosphere. Hence evaporation is greater in dry air.

Multiple choice physics the kinetic model of matter evaporation heat, internal energy and work phase change

Water evaporates under atmospheric pressure. Without changing the temperature, the same water is placed in a partial vacuum. The rate of evaporation will

  1. increase

  2. drop to zero

  3. decrease

  4. remain unaffected
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
In partial vacuum, the pressure is very less.
According to Le-chatelier's principle on decreasing pressure, volume increases so more water converts into gas (vapour).
Multiple choice physics the kinetic model of matter evaporation heat, internal energy and work phase change

A fan produces a feeling of comfort because:

  1. A fan supplies cool air

  2. Of the evaporation of sweat

  3. Fan increase the humidity in air

  4. Fan decrease the humidity in air
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A fan produces a feeling of comfort because of evaporation of sweat because on hot day, our body sweats to loose heat through the evaporation of moisture.In still air evaporation is slow. A fan or breeze helps by replacing hot humid air with cooler dries air that allow for more evaporation


Multiple choice physics the kinetic model of matter evaporation heat, internal energy and work phase change

Relative humidity is the percentage of the

  1. absolute humidity value to the amount of humidity actually present

  2. increase of humidity/absolute humidity

  3. amount of humidity actually present to the absolute humidity

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The ratio of actual amount of water vapour present in volume of air at a given temperature to maximum amount that air could hold at that temperature, expressed as percentage is relative humidity.