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 upthrust in fluids, archimedes' principle and floatation applications of floatation principle of floatation and its applications when do objects float on water?

The hot air balloon rises because it has a gas that is

  1. denser than air

  2. less dense than air

  3. equally dense as air

  4. the given statement is wrong
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Hot air balloon has hot air inside.  Also hot air is less dense than cooler air which surrounds the hot air balloon. This means hot air is lighter than equal volume of cold air.  Hence due to buoyant force of cold air, the balloon rises.

Multiple choice physics upthrust in fluids, archimedes' principle and floatation applications of floatation principle of floatation and its applications when do objects float on water?

A hot air balloon rises because it is filled with a gas :

  1. denser than air

  2. less dense than air

  3. as dense as air

  4. the given statement is wrong
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

More denser objects stays at the bottom.

Since, the hot air balloon rises because it is filled with a gas which is less dense than the air .So, the air has the tendency to move down and the balloon has the tendency to move in the upward direction.

Multiple choice evs atmosphere- wind weather, climate and adaptation of animals to different climates climate and weather weather, climate and adaptations of animals to climate

One litre of cold air weighs heavier than the dry air (1 Lit) because of the

  1. Increased number of collisions between the molecules

  2. Increased number of molecules at low temperature

  3. Greater energy of molecules at high temperature

  4. Lower energy of molecules at high temperature
Reveal answer Fill a bubble to check yourself
B Correct answer
Multiple choice evs atmosphere- wind weather, climate and adaptation of animals to different climates climate and weather weather, climate and adaptations of animals to climate

The wind-chill factor:

  1. Relates body heat loss with wind to an equivalent temperature with no wind

  2. Indicates the temperature at which water freezes on exposed skin

  3. Takes into account humidity and air temperature in expressing the current air temperature

  4. Tells farmers when to protect crops from a freeze
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The wind-chill factor is a measure of the rate of heat loss from exposed skin due to the combined effects of low temperature and wind speed, expressed as an equivalent temperature.

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.