Vayudoot Aviation

1. In the troposphere

over cold air, the pressure is lower at upper levels than at similar levels over warm air

over cold air, the pressure is higher at upper levels than at similar levels over warm air

over warm air, the pressure is lower at upper levels than at similar levels over warm air

the upper level pressure depends solely on the relative humidity below

2. Generally as altitude increases

temperature, pressure and density decreases

temperature and pressure increase and density decreases

temperature decreases and density increases

temperature decreases and pressure density increases

3. The tropopause in mid latitudes is

Lower in summer with a higher temperature.

Lower in winter with a higher temperature.

Lower in winter with a lower temperature.

Lower in summer with a lower temperature.

4. At FL 180, the air temperature is -35°C.The air density at this level is

Less than the density of the ISA atmosphere at FL 180

Equal to the density of the ISA atmosphere at FL 180.

Unable to be determined without knowing the QNH.

Greater than the density of the ISA atmosphere at FL 180.

5. Consider the following statements relative to Air Density and select the one which is correct:

The effect of change of temperature on the air density is much greater than the effect of change of atmospheric pressure

Because air density increases with decrease of temperature, air density must increase with increase of height in the International Standard Atmosphere (ISA..

Air density increases with increase of relative humidity.

At any given surface temperature the air density will be greater in anticyclonic conditions than it will be when the MSL pressure is lower.

6. Under what condition does pressure altitude have the same value as density altitude?

When the altimeter setting is 1013,2 hPa.

At sea level when the temperature is 0°C.

At standard temperature.

When the altimeter has no position error.

7. Density at the surface will be low when

Pressure is high and temperature is low.

Pressure is low and temperature is low.

Pressure is high and temperature is high.

Pressure is low and temperature is high.

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