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Question 1: Density is ………….. at poles than equator
A) Higher
B) Lower
C) Same
Explanation: Density is higher at the poles compared to the equator due to the colder temperatures at higher latitudes.
Question 2: Above 8 km density is …….. at poles than at equator
A) Higher
B) Lower
C) Same
Explanation: Above 8 km, density is lower at the poles because the troposphere is thinner at the poles compared to the equator.
Question 3: The altitude in ISA at which air density is the same as the observed density is called
A) Density Altitude
B) ISA Density
C) Real Density
Explanation: Density altitude refers to the altitude at which the density of the air is equivalent to a given standard atmosphere.
Question 4: Density is usually expressed as
A) Kg/sq m
B) g/cu m
C) N/sq m
Explanation: Air density is commonly expressed in grams per cubic meter (g/cu m).
Question 5: Higher density altitude means …….. density
A) Higher
B) Lower
C) Same
Explanation: Higher density altitude implies lower air density, often due to higher temperatures or lower pressures.
Question 6: For given pressure and temperature moist air has density
A) Higher
B) Lower
C) Same
Explanation: Moist air has a lower density than dry air at the same temperature and pressure because water vapor is less dense than nitrogen and oxygen.
Question 7: Air is less denser in
A) High Altitudes
B) Warm Air
C) High humidity
D) All these
Explanation: Air is less dense in all of these conditions: at high altitudes, in warm air, and in high humidity.
Question 8: Density altitude may be defined as
A) The altitude in a standard atmosphere at which the prevailing pressure occurs.
B) The altitude in a standard atmosphere at which the prevailing density occurs.
C) Surface of constant atmospheric pressure related to standard atmosphere of 1013.2 hPa
Explanation: Density altitude refers to the altitude in a standard atmosphere where the observed air density is equivalent to the prevailing density.
Question 9: If pressure increases the density altitude
A) Increases
B) Lowers
C) Remains the same
Explanation: When pressure increases, the density alt of air increases.
Question 10: For every 1⁰C change in temperature, density altitude differs by
A) 33 ft
B) 100 ft
C) 120 ft
D) 210 ft
Explanation: A 1°C change in temperature affects the density altitude by about 120 feet.

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