Atmospheric Pressure Flashcards
Winds in a low pressure
》(a) Converge
(b) Diverge
(c) Go straight
Low pressure is associated with
(a) Good Weather
》(b) Bad Weather
(c) None
In a high pressure area winds are
(a) Normal
(b) Strong
》(c) Weak
Flying from Low to High an altimeter would read
(a) Over
》(b) Under
(c) constant
Isallobars are lines of equal
(a) Pressure
(b) Temperature Tendency
》(c) Pressure Tendency
What kind of a barometer is an altimeter
》(a) Aneroid
(b) Mercury
(c) Alcohol.
A region between two Lows and Two Highs is
(a) Depression
(b)Secondary Low
》(c) Col
Bad weather and better visibility is associated with
(a) High
》(b) Low
(c) Col
The relationship between height and pressure is made use in construction of
》(a) Altimeter
(b) ASI
(C)VSI
Altimeter always measure the height of aircraft above
(a) MSL
(b) datum of 1013.2 hPa
》(c) datum at which its sub-scale is set
Two aircraft flying at same indicated altitude with altimeters set to 1013.2hPa.One is flying over cold air mass and other over warm air mass. Which of the two has greater altitude?
》(a) Ac flying over warm air mass (b) 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
(a) Same
(b) More
》(c) Less
An increase of 1000’ at msl is associated with decrease of pressure of
(a) 100 hPa
(b) 1000 hPa
(c) 3 hPa
》(d) 33 hPa
Lines drawn through places of equal pressure are known as
》(a) Isobars
(b) Isotherms
(c) Isogonal
(d) Isoclinal
Which is true?
(a) Trough has frontal characteristics
(b) At trough winds back in N-hemisphere
(c) At trough winds veer in N-hemisphere
(a) Trough has frontal characteristics
》(b) At trough winds back in N-hemisphere
(c) At trough winds veer in N-hemisphere
Semi diurnal pressure changes are most pronounced in
(a) Polar region
(b) Middle latitudes
》(c)Tropics
Flying from Delhi to Kolkata at constant indicated altitude but, experiencing drift to Starboard. The actual altitude will be (vis-à-vis) indicated altitude
》(a) Lower
(b) Same
(c) Higher
In the Southern Hemisphere, around a Low Pressure Area wind blows
》(a) In clockwise direction
(b) In anticlockwise direction
(c) Across isobars towards the centre
Q19. Altimeter of a/c on ground reads aerodrome elevation; its sub-scale is set to
》(a) QNH
(b) QNE
(c) QFF
(d) QFE
Instrument for recording pressure is called
(a) Anemograph
》(b) Barometer
(c)Hygrograph
Poor visibility is associated with
》(a) High
(b) Low
(c) Trough
On either side, perpendicular to the……. pressures rise
》(a) Trough
(b) Ridge
(c) Low
Fall of pressure with height is more rapid in
(a) Cold areas
(b) Warm areas
(c) Humid areas
》(a) Cold areas
(b) Warm areas
(c) Humid areas
300 hPa in ISA corresponds to the level
(a) 20,000 ft
》(b) 30,000 ft
(c) 35,000 ft
18,000 ft height in ISA corresponds to the pressure level
(a) 700 hPa
(b) 200 hPa
》(c) 500 hPa
200 hPa in ISA corresponds to the level
(a) 20,000 ft
(b) 30,000 ft
》(c) 40,000 ft
24,000 ft height in ISA corresponds to pressure level
》(a) 400 hPa
(b) 500 hPa
(c) 300 hPa
700 hPa in ISA corresponds to the Flight level
(a) 20,000Oft
》(b) 10,0000 ft
(c) 18,000 ft
40,000 ft height in ISA approximately corresponds to pressure level
(a) 400 hPa
(b) 500 hPa
》(c) 200 hPa
850 hPa in ISA corresponds to the height
(a) 7,000 ft
》(b) 5,000 ft
(c) 10,000 ft
Atmospheric pressure is due to
(a) wind
(b) temperature
(c) gravity
》(d) density
An aircraft is gaining altitude, inspite of altimeter reading constant altitude. Why?
(a) Standard pressure has risen
》(b) Flying towards High
(c) Flying towards Low
(d) Temperature has decreased
A contour of 9160 m can be expected on a constant pressure chart for pressure level
(a) 500 hPa
(b) 400 hPa
》(c) 300 hPa
(d) 200 hPa
In contour chart of 300 hPa, isohypse (contours) are drawn at interval of
(a) 20 gpm
(b) 40 gpm
(c) 60 gpm
》(d) 80 gpm
In constant pressure chart of 500 hPa, isohypse are drawn at interval of
(a) 20 gpm
》(b) 40 gpm
(c) 60 gpm
(d) 80 gpm
QNH of an aerodrome 160 m AMSL is 1005 hPa. QFE? Assuming 1 hPa -8m
(a) 1010 hPa
》(b) 985 hPa
(c)1005 hPa
(d) 990 hPa
Steep pressure gradient would mean
(a) Contours far apart, weak wind (b) Contours far apart ,strong wind
(c) Isobars far apart and temperature low
》(d) Isobars closely packed and strong wind
What type of inversion occurs when a stable layer lies in a high pressure area
(a) Negative
(b) Radiation
》(c) Subsidence
(d) Airmass
Which of the following would cause true altitude to increase when altimeter indicates constant altitude?
(a) Warm/ Low
(b) Cold/ Low
》(c) Hov High
(d) Cool/ Low
The movement of wind in relation to a cyclone is
(a) Descending and subsiding
》(b) Ascending and converging
(c) Descending and cooling
(d) Ascending and diverging
