DGCA Meteorology: Air Density Questions
21 exam-style Air Density questions for the DGCA Meteorology paper (CPL · ATPL · PPL). The first 12 are free below with answers and explanations — sign up free to practise all of them with progress tracking.
-
Q1
Density is _____ at poles than equator
- A Lower
- B Higher
- C Same
Show answer
Correct answer: B. Higher
Air density at the surface is higher at the poles than at the equator because polar air is much colder, and colder air at comparable pressure is denser.
-
Q2
Consider the following statements relative to Air Density and select the one which is correct:
- A Because air density increases with decrease of temperature, air density must increase with increase of height in the International Standard Atmosphere (ISA..
- B At any given surface temperature the air density will be greater in anticyclonic conditions than it will be when the MSL pressure is lower.
- C Air density increases with increase of relative humidity.
- D The effect of change of temperature on the air density is much greater than the effect of change of atmospheric pressure
Show answer
Correct answer: B. At any given surface temperature the air density will be greater in anticyclonic conditions than it will be when the MSL pressure is lower.
This Explanation is Coming Soon
-
Q3
The tropopause in mid latitudes is:
- A Lower in summer with a lower temperature.
- B Lower in winter with a higher temperature.
- C Lower in summer with a higher temperature.
- D Lower in winter with a lower temperature.
Show answer
Correct answer: B. Lower in winter with a higher temperature.
This Explanation is Coming Soon
-
Q4
Generally as altitude increases:
- A temperature decreases and density increases
- B temperature, pressure and density decreases
- C temperature and pressure increase and density decreases
- D temperature decreases and pressure density increases
Show answer
Correct answer: B. temperature, pressure and density decreases
This Explanation is Coming Soon
-
Q5
In the troposphere:
- A over cold air, the pressure is higher at upper levels than at similar levels over warm air
- B over cold air, the pressure is lower at upper levels than at similar levels over warm air
- C over warm air, the pressure is lower at upper levels than at similar levels over warm air
- D the upper level pressure depends solely on the relative humidity below
Show answer
Correct answer: B. over cold air, the pressure is lower at upper levels than at similar levels over warm air
This Explanation is Coming Soon
-
Q6
Density at the surface will be low when:
- A Pressure is high and temperature is high.
- B Pressure is high and temperature is low.
- C Pressure is low and temperature is low.
- D Pressure is low and temperature is high.
Show answer
Correct answer: D. Pressure is low and temperature is high.
This Explanation is Coming Soon
-
Q7
At FL 180, the air temperature is -35°C.The air density at this level is:
- A Equal to the density of the ISA atmosphere at FL 180.
- B Unable to be determined without knowing the QNH.
- C Greater than the density of the ISA atmosphere at FL 180.
- D Less than the density of the ISA atmosphere at FL 180
Show answer
Correct answer: C. Greater than the density of the ISA atmosphere at FL 180.
This Explanation is Coming Soon
-
Q8
Under what condition does pressure altitude have the same value as density altitude?
- A At sea level when the temperature is 0°C.
- B When the altimeter has no position error.
- C When the altimeter setting is 1013,2 hPa.
- D At standard temperature.
Show answer
Correct answer: D. At standard temperature.
This Explanation is Coming Soon
-
Q9
Density is _____ at poles than equator
- A Higher
- B Lower
- C Same
Show answer
Correct answer: A. Higher
Polar air is cold and therefore dense, so at the surface density is higher at the poles than at the warm equator, where the heated, expanded air is comparatively light.
-
Q10
Above 8 km density is ______ at poles than at equator
- A Higher
- B Lower
- C same
Show answer
Correct answer: B. Lower
In the cold polar air column pressure falls off with height much more rapidly than in the warm equatorial column, so above about 8 km the pressure, and with it the density, is lower over the poles than over the equator. The surface relationship is thus reversed at altitude.
-
Q11
The altitude in ISA at which air density is the same as the observed density is
- A Density Altitude
- B ISA Density
- C Real Density
Show answer
Correct answer: A. Density Altitude
Density altitude is defined as the altitude in the International Standard Atmosphere at which the prevailing (observed) air density occurs; it is the single figure that summarises the effect of pressure, temperature and humidity on aircraft performance.
-
Q12
Density is usually expressed as
- A Kg/sq n
- B g/cu m
- C N/sq m
Show answer
Correct answer: B. g/cu m
Air density is customarily expressed in grams per cubic metre, mass per unit volume; at mean sea level in ISA it is about 1225 g per cubic metre.
The full bank
9 more Air Density questions in the full bank
Create a free account to practise every Air Density question with instant scoring, chapter tests, previous DGCA papers and full-length mock exams.
More DGCA Meteorology topics