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 evs - i issues of the environment eco-system and its destruction ecology and ecosystem ecology and ecosysytem

If ELR exceeds ALR, environmental lapse rate, would be considered as:

  1. ELR

  2. Lapse rate

  3. Super adiabatic

  4. Adiabatic lapse rate
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When the Environmental Lapse Rate (ELR) is greater than the Adiabatic Lapse Rate (ALR), the atmosphere is considered unstable. This condition is specifically referred to as super-adiabatic.

Multiple choice physics floating bodies pressure exerted by a liquid column pressure at a certain depth in liquid variation of pressure with depth

If the value of $g$ at a place is decreased by $2\%$. The barometric height of the mercury 

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

  3. Remains unchanged

  4. Sometime increases and sometime decreases
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
We know that,

$P=h\rho g$

Then,

$h=\dfrac{P}{\rho g}$

So, $h\propto \dfrac 1g$

If the value of $g$ decreased by $2\%$ then $h$ will increase by $2\%$.
Multiple choice physics floating bodies pressure exerted by a liquid column pressure at a certain depth in liquid variation of pressure with depth

If the air density were uniform, then the height of the atmosphere above the sea level to produce a normal atmospheric pressure of 1.0 x 10$^{5}$ Pa is(density of air is 1.3 kg/m$^{3}$ , g $=$ 10m/s$^{2}$):

  1. 0.77 km

  2. 7.7 km

  3. 77 km

  4. 0.077 km
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

$\rho g h = 1 \times 10^5$
$\Rightarrow h = \dfrac {10^5}{\rho g} = \dfrac {10^5}{1.3 \times 10} = 7.7 km$

Multiple choice physics floating bodies pressure exerted by a liquid column pressure at a certain depth in liquid variation of pressure with depth

State True or False.
As the vertical height from mean sea level increases, the atmospheric pressure decreases.

  1. True

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

Pressure decreases with increase in altitude. The pressure at any level in the atmosphere may be interpreted as the total weight of the air above a unit area at any elevation. At higher elevations, there are fewer air molecules above a given surface than a similar surface at lower levels.

Multiple choice physics floating bodies pressure exerted by a liquid column pressure at a certain depth in liquid variation of pressure with depth

State True or False.
One atmospheric pressure at sea level is equal to $760\ cm$ of $Hg$.

  1. True

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

Wrong statement.

The average air pressure at sea level is equivalent to the pressure produced by a column of water about 10 meters (or about 76 cm of mercury column).
$P=10^5Nm^{-2}$ at sea level
density of mercury is $13600$ $kg m^3$
we know $P=\rho gh$
So $10^{5}=13600\times 9.8\times h$ 
$h=0.76m=76cm$

Multiple choice physics floating bodies pressure exerted by a liquid column pressure at a certain depth in liquid variation of pressure with depth

How is the reading of a barometer affected when it is taken to (i) a mine, and (ii) a hill?

  1. (i) increases, (ii) decreases.

  2. (i) decreases, (ii) increases.

  3. (i)remains same (ii) decreases

  4. (i) increases, (ii) remains same
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

(i) increases due to increase in height of atmosphere above it.
(ii) decreases. due to decrease in height of atmosphere above it.

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

The air pressure inside out body is equal to the ____?

  1. in internal pressure

  2. atmospheric pressure

  3. both a and b

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

The pressure inside our bodies is equal to the atmospheric pressure and cancels the pressure from outside. we do not get crushed under the atmospheric pressure.

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

Ink does not spill out of an ink dropper when the atmospheric pressure and ____ pressure are equal.

  1. external

  2. internal

  3. air

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

As the pressure inside the dropper, i.e, the internal pressure and the atmospheric pressure become equals,  ink does not spill out.

Multiple choice physics pressure in fluids and atmospheric pressure pressure in air introduction to atmospheric pressure pressure exerted by air devices to measure pressure
Air pressure at sea level is ________ of mercury.
  1. $6\,m$
  2. $0.36\,km$
  3. $60\,cm$
  4. $0.76\,m$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When air pressure is measure at the sea level using a mercury barometer, the height upto which the mercury column rises is $76cm$.

Hence the atmospheric pressure at this level is also called $0.76m$ of mercury.

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

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.