Physics · Geography

Atmospheric Physics and Humidity

935 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 physics pressure in fluids and atmospheric pressure pressure in air introduction to atmospheric pressure pressure exerted by air devices to measure pressure

You are riding on your bicycle with inflated tyres. Your friend asks for a lift and sits on the carrier behind you

  1. The air pressure in the tyres increases

  2. The air pressure in the tyres decreases

  3. The air pressure in the tyres remains the same

  4. Nothing inthe system changes except the reaction of the ground

  5. Answer Required
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

nothing in the system changes except the reaction of the ground.

because the friend will exert its weight on the ground and the ground will exert normal reaction to balance it.

Multiple choice physics fluid pressure pressure in air introduction to atmospheric pressure pressure exerted by air devices to measure pressure

Which of the following is/are the example(s) of absolute pressure 

  1. deep vacuum pressure

  2. altimeter pressure

  3. blood pressure

  4. both (A) & (B)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Absolute pressure: It uses absolute zero (pressure in vacuum) as its zero point.

Gauge pressure: It uses atmospheric pressure  as its zero point.
Therefore, Absolute pressure = Atmospheric pressure + Gauge pressure 
Blood pressure is an example of gauge pressure .
Deep vacuum pressure and altimeter pressure are examples of absolute pressure.

Multiple choice physics fluid pressure pressure in air introduction to atmospheric pressure pressure exerted by air devices to measure pressure

The correct relationship between gauge pressure, atmospheric pressure and absolute pressure is 

  1. Gauge pressure = Atmospheric pressure - Absolute pressure

  2. Gauge pressure = Atmospheric pressure + Absolute pressure

  3. Absolute pressure = Atmospheric pressure + Gauge pressure

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

Absolute pressure: It uses absolute zero (pressure in vacuum) as its zero point.

Gauge pressure: It uses atmospheric pressure  as its zero point.
Therefore, Absolute pressure = Atmospheric pressure + Gauge pressure 

Multiple choice physics fluid pressure pressure in air introduction to atmospheric pressure pressure exerted by air devices to measure pressure

The amount by which the pressure measured in a fluid exceeds that of the atmosphere is known as 

  1. atmospheric pressure

  2. gauge pressure

  3. absolute pressure

  4. none of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Gauge Pressure uses a reference to the atmosphere around the sensor. Because the sensing element has a deflection due to a pressure change, a reference point is needed to know exactly what pressure is being measured. Pressure sensors that use gauge pressure—typically seen in PSIG, BARG, and kPaG —have some type of vent. This vent can be built in to the sensor or even through a tube in the electrical connection. The vent is positioned to use atmospheric pressure as a reference point for the sensor to measure the media. One common reason for using gauge pressure is to ensure that with any location throughout the world, the sensor will always reference the location in which it is installed.

Multiple choice physics fluid pressure pressure in air introduction to atmospheric pressure pressure exerted by air devices to measure pressure

A barometer is carried from the $1^{st}$ floor to the $20^{th}$ floor of a building. Why does the reading on the barometer fall?

  1. Air pressure has increased

  2. Gravity has decreased

  3. Temperature has increased

  4. There is less air above the barometer
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Answer is D.

The air pressure decreases as the we go up the atmosphere. Therefore, when a  barometer is carried from the 1st floor to the 20th floor of a building, the air pressure decreases and hence the reading on the barometer falls down.

Multiple choice physics fluid pressure pressure in air introduction to atmospheric pressure pressure exerted by air devices to measure pressure

Increase in height of mercury column indicates:

  1. decrease in atmospheric pressure

  2. increase in atmospheric pressure

  3. no change in atmospheric pressure

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

The pressure at the bottom of mercury column tries to equate the atmospheric pressure outside. 
When the compensating height of mercury column increases, it means that the atmospheric pressure has indeed increased.

Multiple choice physics fluid pressure pressure in air introduction to atmospheric pressure pressure exerted by air devices to measure pressure

Suppose the density of air at Hyderabad is $\rho _ { 0 }$ and atmospheric pressure is $P _ { \mathrm { atm } }$.Suppose we wish to calculate the pressure $P$ at a height $10 \mathrm { km }$ above Hyderabad. If we use the equation $P _ { 0 } - P = \rho g z$ to calculate $P$ with $z = 10 km$. But if we take only variation of $\rho$ with height we get $P _1$. if we take only of $g$ with height we get $P _2$, if we take both $\rho$ and $g$ variations with height we get $P _3$. Then 

  1. $P = P _ { 1 } = P _ { 2 } = P _ { 3 }$
  2. $P _ { 3 } < P _ { 1 }$
  3. $P _ { 2 } > P$
  4. $P _ { 0 } - P > P _ { 0 } - P _ { 3 }$
Reveal answer Fill a bubble to check yourself
C Correct answer
Multiple choice economics ancient indian economic concepts goods, wealth and welfare major definitions of economics wealth, capital and money

Which of the following is an economic good?

  1. Sunshine

  2. Air

  3. Rainfall

  4. A bottle of water
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Goods are divided as free goods and economic goods. Free goods are those goods which are free of cost and economic goods are available for a particular price. Among the given options, sunshine, rainfall and air are examples of free goods and a bottle of water is an example of economic good.

Multiple choice business organisation and correspondence environmental pollution and industries air pollution and its effects the environment and us environment and conservation

In thermal inversion.

  1. Warm ground air gets overlapped by cool air

  2. Cool ground air gets overlapped by warm air

  3. Ground temperature becomes high in winter

  4. Ground temperature becomes low in summer
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A thermal inversion takes place when a layer of warm air settles over a layer of cooler air that lies just above the ground. The warm air holds down the cool air and prevents pollutants from rising and scattering.

So, the correct option is 'Cool ground air gets overlapped by warm air'.

Multiple choice business organisation and correspondence environmental pollution and industries air pollution and its effects the environment and us environment and conservation

After thermal inversion, pollutants pile up in.

  1. Hanging cool air

  2. Hanging warm air

  3. At the boundary of cool and warm airs

  4. Soil
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In a thermal inversion, the cold air holds up the pollutants and prevents it from rising and scattering.

So, the correct option is 'Hanging cool air'.

Multiple choice business organisation and correspondence environmental pollution and industries air pollution and its effects the environment and us environment and conservation

Mist is fog with horizontal visibility of

  1. 100 m

  2. 200 m

  3. 500 m

  4. 1 km
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The visibility of less than 1 km is the standard range for fog, that is formed due to condensation of the water droplets near earth's surface. Mist is formed due to the dispersion of dust and smoke in the air along with nucleation of the water droplets and the visibility range for mist is between 1 km to 2 km. The visibility range for haze is between 2 km to 5 km.

Hence, the correct answer is '1 km'

Multiple choice business organisation and correspondence environmental pollution and industries air pollution and its effects the environment and us environment and conservation

Fog is formed by

  1. Smoke

  2. Condensation of water vapours

  3. Condensation of water vapours over dust particles

  4. Both A and C
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When there is temperature difference between the land and the atmosphere, and the land is also having low temperature, then the condensation of the water droplets/water vapours can begin near the surface. The condensation process occurs around the dust particles present in the air, so the dust particles provide nucleation for fog formation. Smoke and dust forms the haze. Smoke, dust and water droplets form the mist. Hence, the correct answer is ‘Condensation of water vapours over dust particles’.

Multiple choice biology living in harmony climate factors abiotic components organisms and environment

In the stratosphere, the air temperature normally:

  1. Decreases with increasing height

  2. Increases with increasing height

  3. Both increases and decreases depending on the season

  4. Cannot be measured
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In the stratosphere, temperature increases with altitude because the ozone layer absorbs ultraviolet radiation from the sun, which heats the surrounding air.

Multiple choice biology living in harmony climate factors abiotic components organisms and environment

Low clouds retard surface cooling at night better than clear skies because:

  1. The clouds absorb and radiate infrared energy back to earth

  2. The water droplets in the clouds reflect infrared energy back to earth

  3. The clouds start convection currents between them

  4. The clouds are better conductors of heat than is the clear night air
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Clouds act as a blanket at night by absorbing longwave infrared radiation emitted by the Earth's surface and re-radiating a portion of it back down, which reduces the rate of surface cooling.