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 various types of barometer fluids physics
Which of the following is not an advantage of using mercury as a barometric liquid.

  1. It does not affect the barometric height

  2. It gives correct reading

  3. It is easily seen due to its shiny appearance

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

The surface of mercury is shiny and opaque. Therefore it is easily seen while taking the observation. The vapor pressure of mercury is negligible. Hence the barometric height is not affected. The mercury neither sticks nor wets the glass tube.

Multiple choice various types of barometer fluids physics
Mercury .......... under vacuum conditions.

  1. Evaporates

  2. Does not evaporate

  3. No relation of evaporation with mercury

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

Mercury does not evaporate under vacuum conditions, whereas water does. Hence water is not used in barometers due to this effect whereas mercury is highly preferred.

Multiple choice various types of barometer fluids physics
Mercury can be obtained in its pure form. What is its advantage?

  1. True atmospheric pressure can be recorded.

  2. Mercury does not affect the barometric height.

  3. It is easily seen while taking observation.

  4. All the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Mercury can be easily obtained in its pure state and one can record the true atmospheric pressure as the pressure is directly proportional to the density of the liquid.
Multiple choice various types of barometer fluids physics

The value of $\mathrm { g }$ at a place decreases by 2$\%$ . The barometric height of mercury 

  1. Increases by 2$\%$
  2. Decreases by 2$\%$

  3. Remains unchanged

  4. Sometimes increases and so
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Barometric height h = P / (rho * g). If P is constant and rho is constant, h is inversely proportional to g. If g decreases by 2%, h must increase by approximately 2%.

Multiple choice various types of barometer fluids physics

How is the barometric height of a simple barometer affected if
(a) its tube is pushed down into the trough of mercury?
(b) its tube is slightly tilted form vertical?
(c) a drop of liquid is inserted inside the tube?

  1. (a) remains unaffected (b) increases (c) decreases

  2. (a) decreases (b) increases (c) decreases

  3. (a) increases (b) remains unaffected (c) increases

  4. (a) remains unaffected (b) remains unaffected (c) decreases
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Below are the answers:
(a) Mercury in the tube adjusts until the weight of the mercury column balances the atmospheric force exerted on the reservoir. High atmospheric pressure places more force on the reservoir, forcing mercury higher in the column. Low pressure allows the mercury to drop to a lower level in the column by lowering the force placed on the reservoir.
When the tube is pushed down into the trough of mercury the height of mercury column above the surface of the bottom surface remains the same. 


(b) When the tube is slightly tilted form vertical, there is no change in the height of the mercury in the tube.

(c) If the vacuum is replaced with a drop, then the drop will exert some pressure on the mercury and there will be inaccurate readings on the barometer. The barometric height is decreased in this case. So, vacuum is present on top of the mercury inside the tube.

Multiple choice various types of barometer fluids physics

Atmospheric pressure at a place is $66cm$ of mercury. This place is

  1. $1250m$ above sea level
  2. $1250m$ below sea level
  3. $125m$ above sea level

  4. at the sea level
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Atmospheric pressure at the place is equivalent to that of $66cm$ of mercury.
We know that atmospheric pressure at the sea level is equivalent to that of $76cm$ of mercury.
So, pressure at that place is less by $(76-66)=10cm$ of mercury.
We know that atmospheric pressure decreases by $1cm$ for every $125m$ increase in altitude.
So, the concerned place is $(125 \times 10)m=1250m$ above the sea level.

Multiple choice various types of barometer fluids physics

Water vaporizes under vacuum conditions. Mark the statement which is correct with respect to using water as a barometric fluid.

  1. It will show the true atmospheric pressure.

  2. It will be clearly seen in the glass tube.

  3. It will not show true atmospheric pressure.

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

WATER VAPORISES UNDER VACUUM CONDITIONS.THUS WATER BAROMETER WILL NOT SHOW TRUE ATMOSPHERIC PRESSURE.

Multiple choice various types of barometer fluids physics

Atmospheric pressure at a certain place is equivalent to $78cm$ of mercury. That place is

  1. $250m$ above sea level
  2. $250m$ below sea level
  3. $125m$ above sea level

  4. at the sea level
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Atmospheric pressure at that place is $78cm$ of mercury.
We know that the atmospheric pressure at the sea level is $76cm$ of mercury.
This means, this place has an atmospheric pressure $(78-76)cm=2cm$ more than the atmospheric pressure at the sea level.
We know that the atmospheric pressure increases by $1cm$ for every $125m$ decrease in height.
So, this place is $(125 \times 2)m=250m$ below sea level.

Multiple choice various types of barometer fluids physics
Gradual fall in the mercury level in a barometer indicates

  1. possibility of rain

  2. possibility of thunderstorm

  3. fair weather

  4. dry and sunny weather
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Gradual fall in the mercury level occurs at low pressure- If there is too much moisture in the air, indicates the possibility of rain

Multiple choice geography atmosphere and climate atmosphere and its structures what is around us? the atmosphere elements of weather and climate : temperature the earth's structure

A column of air 1 sq. em. in cross-sectional area extending from sea-level to the top of the atmosphere weights approximately.

  1. 933 g wt

  2. 1013 g wt

  3. 1136 g wt

  4. 1360 g wt
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Standard atmospheric pressure at sea level is approximately 1013.25 millibars, which corresponds to a force of about 1033 grams per square centimeter. 1013 g wt is the standard accepted value in many physics textbooks for this calculation.

Multiple choice chemistry properties of natural resources conservation of water and recycling properties of water structure and properties of water

The boiling point of water is inversely proportional to the atmospheric pressure.

  1. True

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

The boiling point of water is not proportional to the atmospheric pressure. As the elevation increases, atmosphere decreases because air is less dense at high altitudes. Because the atmospheric pressure is lower, the vapour pressure of the liquid needs to be lower to reach boiling point. Therefore, less heat is required to make the vapour pressure equal to the atmospheric pressure.

Multiple choice chemistry properties of natural resources conservation of water and recycling properties of water structure and properties of water

Statement 1: Water boils below ${100}^{o}C$ at high altitudes. 
Statement 2: Atmospheric pressure varies inversely with altitude.

  1. Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1

  2. Both the Statement 1 and Statement 2 are correct and Statement 2 is NOT the correct explanation of Statement 1.

  3. Statement 1 is correct but Statement 2 is not correct.

  4. Statement 1 is not correct but Statement 2 is correct.

  5. Both the Statement 1 and Statement 2 are not correct.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Pressure changes inversely with altitudes and boiling point directly proportional to pressure. Pressure and boiling points are low at high altitudes. So water boils below 100$ ^{\circ}C $.

Multiple choice evs when there is a disaster disaster and types disasters forest fire

Factors affecting cyclone are

  1. Temperature

  2. Humidity

  3. Wind speed

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

Cyclones are complex weather systems influenced by sea surface temperature, air humidity, and wind speed, which all contribute to their formation and strength.

Multiple choice geography hydrologic cycle the atmosphere elements of weather and climate :humidity hydrologic cycle and its components elements of weather and climate : temperature

Relative humidity is measure in terms of ________________.

  1. Grams per cubic diameter

  2. Centimeter per second square

  3. Bars

  4. Percentage
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Relative humidity is defined as the ratio of the amount of water vapor in the air to the maximum amount of water vapor the air could hold at that temperature, expressed as a percentage.

Multiple choice geography hydrologic cycle the atmosphere elements of weather and climate :humidity hydrologic cycle and its components elements of weather and climate : temperature

Absolute humidity is the ____________ amount of water vapor present in the air.

  1. half

  2. total

  3. one third

  4. one fourth
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Absolute humidity is the total amount of water vapor present in the air. In other words, the weight of water vapor per volume of air is referred to as the absolute humidity. It is usually expressed as grams of water vapor per cubic meter of air. Absolute humidity varies with the expansion or contraction of air, even though the amount of water vapor is constant.