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WorksheetsATMOSPHERE + ATMOSPHERIC PRESSURE
Total questions: 86
Worksheet time: 43mins
Lowest layer of atmosphere is ...
Troposphere
Tropopause
Stratosphere
Height of Tropopause at equator is .........
10-12 km
16-18 km
12-14 km
Height of Tropopause at Poles is
12-14 km
12-13 km
08-10 km
Higher the surface temperature
Higher
Lower
Same
Height of tropopause
Is constant
Varies with altitude
Varies with latitude
Above 8 km the lower temperatures are over ...........
Equator
Mid Latitudes
Poles
Atmosphere is heated by
Solar Radiation
Heat from earth surface
From above
Tropos means
Turning
Under current
Convection
CO2 and H2O are also called
Green House Gases
Rare Earth Gases
Troposphere is generally
Stable
Unstable
Neutral
Stratosphere is
Unstable
Neutral
Stable
Tropopause is discontinuous at about
30°lat
40°lat
80°lat
Most of atmospheric mass is contained in
Troposphere
Stratosphere
Heterosphere
Stratosphere extends from Tropopause to
50 km
60 km
40 km
The middle atmosphere layer with temperature inversion and stability is
Troposphere
Tropopause
Stratosphere
Mother of Pearl clouds occur in
Mesosphere
Thermosphere
Stratosphere
The temperature in ISA at 17 km is
-56.5°C
-65.5°C
35.5°C
By weight, approximate ratio of Oz to Nz in the atmosphere is
1:3
1:4
1:5
By volume, the approximate ratio of Oz to Nz in the atmosphere is
1:3
1:4
1:5
By volume, the proportion of CO₂ in the atmosphere is
3%
0.3%
0.03%
In ISA, the mean sea level temperature is
15°C
10°C
25°C
Maximum concentration of ozone is at a height of
10-15 km
20 - 25 km
30-35 km
Additional oxygen is needed while flying above:
5000 ft
7000 ft
10000 ft
CO2 and H2O keep the atmosphere:
Warm
Cold
Have no effect
Noctilucent clouds occur in:
Thermosphere
Mesosphere
Stratosphere
Temperature at 2 km is 05°C. What is ISA deviation? (Actual - ISA)
-05°C
-02°C
03°C
Pressure at MSL is 1002.25 hPa. Find the ISA deviation (Actual - ISA):
-11 hPa
10 hPa
12 hPa
In actual atmosphere, temp. at 19 km is -60°C. Find the ISA deviation:
4.5°C
-05.5°C
-03.5°C
Nacreous clouds occur in:
Thermosphere
Mesosphere
Upper Stratosphere
The atmosphere up to 80 km has a nearly similar composition and is called the Homosphere. Its uniform composition is due to:
Pressure
Gravitation of earth
Mixing due to turbulence
Half of the atmospheric air mass is contained below:
10-15 km
20-25 km
30-35 km
In jet standard atmosphere, the Lapse Rate is
2°C/1000 ft
2°C/km
5°C/km
10°C/km
The rate of fall of temperatures with height is called
Isothermal rate
Inversion Rate
Lapse Rate
Temperature Gradient
In actual atmosphere, the lapse rate could
Assume any value
Fall up to 8 km
Rise up to 50 km
Remain constant
Tropical Tropopause extends from the equator to Lat. 35°- 40°. Over India, it is at
20-21 km
14-15 km
16-16.5 km
Lapse rate in the troposphere is produced by... and in the stratosphere by...
Evaporation; condensation
Rising air; solar radiation
Terrestrial radiation; solar radiation
Solar radiation; convection
Most of the water vapour in the atmosphere is confined up to
Stratosphere
30,000 ft
Mid troposphere
Lower troposphere
Negative lapse rate of temperature is
Isothermal rate
Temperature rise with lowering height
Temperature rise with height
Temperature fall with height
In ICAO ISA, the atmosphere is assumed to be isothermal
In stratosphere
11 to 16 km
11 to 20 km
11 to 32 km
One of the characteristics of our atmosphere is
Poor conductor of heat and electricity
Equator is warmer than poles above 10 km
Lapse rate in the stratosphere is positive
Density is constant above 8 km
Heat transfer in the atmosphere is maximum due to
Convection
Radiation
Sensible heat
Latent heat
The knowledge of the height of tropopause is important for a pilot because
Weather is mainly confined up to this level
Clouds rarely reach up to this height due to jetstreams
Stratosphere starts at this height where all solar radiation are absorbed
In ISA atmosphere the tropopause occurs at a height of
8 - 10 km
11 km
16-18 km
Most of the transfer of heat in the atmosphere is due to
Conduction and freezing
Convection and evaporation
Condensation, sublimation and freezing
Sublimation and radiation
There is reversal of temperature in the atmosphere at 8 km because
Lapse rate at poles is always higher than at equator
Lapse rate at equator is always higher than at poles
Lapse rate at equator is the same as at poles even above the poles
Lapse rate reverses at poles and becomes negative
Winds in a low pressure
Converge
Diverge
Go straight
Low pressure is associated with
Good Weather
Bad Weather
None
In a high pressure area winds are
Normal
Strong
Weak
Flying from Low to High an altimeter would read
Over
Under
Constant
Isallobars are lines of equal
Pressure
Temperature Tendency
Pressure Tendency
What kind of a barometer is an altimeter
Aneroid
Mercury
Alcohol
A region between two Lows and Two Highs is
Depression
Secondary Low
Col
Bad weather and better visibility is associated with
High
Low
Col
The relationship between height and pressure is made use in construction of
Altimeter
ASI
VSI
Altimeter always measures the height of aircraft above
MSL
Datum of 1013.2 hPa
Datum at which its sub-scale is set
Two aircraft flying at same indicated altitude with altimeters set to 1013.2 hPa. One is flying over cold air mass and other over warm air mass. Which of the two has greater altitude?
Ac flying over warm air mass
Ac flying over cold air mass
The rate of fall of pressure with height in a warm air mass compared to cold air mass will be
Same
More
Less
An increase of 1000 ft at ms is associated with decrease of pressure of
100 hPa
1000 hPa
3 hPa
33 hPa
Lines drawn through places of equal pressure are known as
Isobars
Isotherms
Isogonal
Isoclinal
Which is true?
Trough has frontal characteristics
At trough winds back in N-hemisphere
At trough winds veer in N-hemisphere
Semi diurnal pressure changes are most pronounced in
Polar region
Middle latitudes
Tropics
Flying from Delhi to Kolkata at constant indicated altitude but experiencing drift to Starboard. The actual altitude will be (vis-a-vis) indicated altitude
Lower
Same
Higher
In the Southern Hemisphere, around a Low Pressure Area wind blows
In clockwise direction
In anticlockwise direction
Across isobars towards the centre
Altimeter of a/c on ground reads aerodrome elevation; its sub-scale is set to
QNH
ONE
QFF
OFE
Instrument for recording pressure is called
Anemograph
Barometer
Hygrograph
Poor visibility is associated with
High
Low
On either side, perpendicular to the
Trough
Ridge
Trough
Fall of pressure with height is more rapid in
Cold areas
Warm areas
300 hPa in ISA corresponds to the level
20,000 ft
30,000 ft
35,000 ft
18,000 ft height in ISA corresponds to the pressure level
700 hPa
200 hPa
500 hPa
200 hPa in ISA corresponds to the level
20,000 ft
30,000 ft
40,000 ft
24,000 ft height in ISA corresponds to pressure level
400 hPa
500 hPa
300 hPa
700 hPa in ISA corresponds to the Flight level
20,000 ft
10,000 ft
18,000 ft
40,000 ft height in ISA approximately corresponds to pressure level
400 hPa
500 hPa
200 hPa
850 hPa in ISA corresponds to the height
7,000 ft
5,000 ft
10,000 ft
Atmospheric pressure is due to
wind
temperature
gravity
density
An aircraft is gaining altitude, in spite of altimeter reading constant altitude. Why?
Standard pressure has risen
Flying towards High
Flying towards Low
Temperature has decreased
A contour of 9160 m can be expected on a constant pressure chart for pressure level
300 hPa
200 hPa
500 hPa
400 hPa
In contour chart of 300 hPa, isohypse (contours) are drawn at interval of
20 gpm
40 gpm
60 gpm
80 gpm
In constant pressure chart of 500 hPa, isohypse are drawn at interval of
20 gpm
40 gpm
60 gpm
80 gpm
QNH of an aerodrome 160 m AMSL is 1005 hPa. QFE? Assuming 1 hPa = -8m
1010 hPa
985 hPa
1005 hPa
990 hPa
Steep pressure gradient would mean
Contours far apart, weak wind
Contours far apart, strong wind
Isobars far apart and temperature low
Isobars closely packed and strong wind
What type of inversion occurs when a stable layer lies in a high pressure area
Negative
Radiation
Subsidence
Airmass
Which of the following would cause true altitude to increase when altimeter indicates constant altitude?
Warm/ Low
Cold/ Low
Hot/ High
Cool/ Low
The movement of wind in relation to a cyclone is
Descending and subsiding
Ascending and converging
Descending and cooling
Ascending and subsiding
An aerodrome is at the mean sea level. Its QNH is 1014.0 hPa. Its QFF will be
1014.0 hPa
1013.25
Difficult to tell
More than QNH
