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 common consequences of the atmospheric pressure atmospheric pressure and its consequences important points about atmospheric pressure

Which of the following statements is false?

  1. Atmospheric pressure decreases with increasing altitude.

  2. The air is less dense at high altitudes compared to sea level.

  3. The percentage of oxygen in the air decreases with increasing altitude.

  4. Each liter of air contains fewer molecules of gas at increasing altitude.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The percentage of oxygen in the air decreases with increasing altitude.

Multiple choice physics pressure in fluids and atmospheric pressure common consequences of the atmospheric pressure atmospheric pressure and its consequences important points about atmospheric pressure

State true or false.
Atmospheric pressure decreases with increase in height.

  1. True

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

It is to be remembered that 

P = Po - Sgh;  here h is the height above the ground level.
Hence atmospheric pressure decreases with increase in height.

Multiple choice physics pressure in fluids and atmospheric pressure common consequences of the atmospheric pressure atmospheric pressure and its consequences important points about atmospheric pressure

In troposphere, temperature varies linearly with elevation as $T=T _0-ay$, where $T _0$ is the temperature at the earth surface, then:

  1. the pressure does not change with elevation in troposphere

  2. the variation of pressure with elevation is linear
  3. the dimension of $a$ is $[M^0L^{-1}0]$

  4. the pressure is independent of variation with temperature in the given situation
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Given T = T0 - ay, the dimension of 'a' must be temperature divided by length (K/L) to make the equation dimensionally consistent.

Multiple choice physics pressure in fluids and atmospheric pressure common consequences of the atmospheric pressure atmospheric pressure and its consequences important points about atmospheric pressure

The atmospheric pressure on a hill can be ___ $cm$ of mercury.

  1. $76$
  2. $70$
  3. $79$

  4. can't say
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Pressure at the surface is $76 cm$ of mercury , Also as we up on a hill pressure decrease ,hence pressure will be less than $76 cm$ of mercury.

So the possible answer is $70 cm$ of mercury.

Multiple choice physics pressure in fluids and atmospheric pressure common consequences of the atmospheric pressure atmospheric pressure and its consequences important points about atmospheric pressure

How does pressure vary as we come from mountain top to sea level?

  1. Increases

  2. Decreases

  3. Remains same

  4. Depends on weather
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Answer is A.

For every meter we descend, the pressure per square meter increases by the weight of air per cubic meter at the height where we are.

Multiple choice physics pressure in fluids and atmospheric pressure common consequences of the atmospheric pressure atmospheric pressure and its consequences important points about atmospheric pressure

______ m of air column ,on an average ,will exert as much pressure as 1 cm column of mercury.

  1. 100

  2. 1

  3. 20

  4. 105
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

We may write, 
Height of air column $\times$ Density of air $=$ Hight of mercury column $\times$ Density of mercury
Height of air column x $\displaystyle 1.29{ kg }/{ { m }^{ 3 } }=0.01m\times 13600{ kg }/{ { m }^{ 3 } }$
Height of air column =$\frac{136}{1.29}=105m$ (approx)

Multiple choice physics pressure in fluids and atmospheric pressure common consequences of the atmospheric pressure atmospheric pressure and its consequences important points about atmospheric pressure

It takes much longer to cook food in the hills than in the plains, because

  1. in the hills the atmospheric pressure is lower than that in the plains and therefore water boils at a temperature lower than $100^oC$ causing an increase in cooking time
  2. due to low atmospheric pressure on the hills, the water boils at a temperature higher than $100^oC$ and therefore water takes longer to boil

  3. in the hills the atmospheric density is low and therefore a lot of heat is lost to the atmosphere

  4. in the hills the humidity is high and therefore a lot of heat is absorbed by the atmosphere leaving very little heat for cooking
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Since decrease in air pressure causes decrease in boiling temperature, because of which it takes more time to cook at hilly areas or high altitudes.

Multiple choice physics pressure in fluids and atmospheric pressure common consequences of the atmospheric pressure atmospheric pressure and its consequences important points about atmospheric pressure

Water boils at a lower temperature than $100^o$C on a hill station, because.

  1. Pressure is lower at high altitudes

  2. Temperature is lower at high altitudes

  3. Water vapours are less at high altitudes

  4. There is cloud formation at high altitudes
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Pressure decreases as we go up due to which boiling point also decreases. So water boils at a lower temperature than $100^{\circ C}$ on hill station.

Multiple choice physics pressure in fluids and atmospheric pressure common consequences of the atmospheric pressure atmospheric pressure and its consequences important points about atmospheric pressure

Why does water boil below $100^o$C at higher altitudes?

  1. Pollution-free air at higher altitudes increases the calorific value of fuel used

  2. Water available at higher altitudes is purer than that in the plains

  3. There is lesser dissipation of heat at higher altitudes

  4. The atmospheric pressure at higher altitudes is low as compared to that at sea level
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

As the atmospheric pressure is low at higher altitudes is compared to that sea level which causes decrease in boiling point as pressure is inversely proportional  the temperature. So, water does boil below $100^{\circ }C$ at higher altitude

Multiple choice physics pressure common consequences of the atmospheric pressure atmospheric pressure and its consequences important points about atmospheric pressure

Average density of air is:

  1. $\displaystyle 13600{ kg }/{ { m }^{ 3 } }$
  2. $\displaystyle 1.29{ kg }/{ { m }^{ 3 } }$

  3. Both

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

Average density of air is $\displaystyle 1.29{ kg }/{ { m }^{ 3 } }$ and the density of mercury as $\displaystyle 13600{ kg }/{ { m }^{ 3 } }$.

Multiple choice business economics and quantitative methods measures of dispersion and skewness quartile deviation or semi-interquartile range interquartile range histograms and frequency distribution diagrams

Which of the following is true with respect to range?

  1. Higher value of Range implies higher dispersion and vice-versa

  2. Range is unduly affected by extreme values.

  3. It is not based on all the values.

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

Range is the difference between the maximum and minimum values. Because it only considers these two extremes, it is highly sensitive to outliers and does not account for the distribution of all data points.

Multiple choice chemistry nitrogen and sulfur nitrogen gas component of air - nitrogen nitrogen

If the amount of nitrogen in air is low, then the burning capacity of air decreases.

  1. True

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

Nitrogen is not combustible under ordinary circumstances. In fact, the National Fire Protection Association has given nitrogen a flammability rating of zero so it has no effect on burning.