Pressure System 1

DGCA QUESTIONS BANK FOR PILOTS

OXFORD PRESSURES SYSTEM QUESTION PAPER

“When once you have tasted flight, you will forever walk the earth with your eyes turned skyward, for there you have been, and there you will always long to return.”
– Leonardo DaVinci

PRESSURE SYSTEM1

Practice Paper of PRESSURE SYSTEM1

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#1. (For this question use annex B) A ridge is indicated by letters:

A & C

B & C

C & D

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2. When isobars, for an area in the mid-latitudes on a weather map, are close together, the wind is most likely to be

changing direction rapidly

light

strong

blowing perpendicular to the isobars

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#3. Subsidence is:

vertically upwards motion of air

the same as convection

vertically downwards motion of air

horizontal motion of air

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4. The isobars drawn on a surface weather chart represent lines of equal pressure

at flight level

at height of observatory

at a determined density altitude

reduced to sea level

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5. Areas of sinking air are generally cloudless because as air sinks it

loses water vapour

is heated by compression

reaches warmer layers

is heated by expansion

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6. What type of air movement is associated with the centre line of a trough?

Divergence with descending air.

Divergence with lifting.

Convergence with descending air.

Convergence with lifting.

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7. Extensive cloud and precipitation is often associated with a non frontal thermal depression because of

surface divergence and upper level convergence causing widespread descent of air in the depression

surface divergence and upper level convergence causing widespread ascent of air in the depression

surface convergence and upper level divergence causing widespread ascent of air in the depression

surface convergence and upper level divergence causing widespread descent of air in the depression

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#9. How do air masses move at a warm front?

Cold air overrides a warm air mass

Cold air undercuts a warm air mass

Warm air undercuts a cold air mass

Warm air overrides a cold air mass

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8. A trough of low pressure on a surface synoptic chart is an area of

convergence and subsidence

convergence and widespread ascent

divergence and subsidence

divergence and widespread ascent

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#10. In temperate latitudes what weather conditions may be expected over land during the summer in the centre of a stationary high pressure zone?

thick low level cloud.

Calm winds, haze.

showers and thunderstorms.

cumulus clouds and thunderstorms

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#11. What surface weather is associated with a stationary high pressure region over land in the winter?

thick stratus with continuous rain.

The possibility of snow showers.

A tendency for fog and low stratus

Thunderstorms

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#12. (For this question use annex A) Which of the following best describes Zone D?

Ridge of high pres

Anticyclone

Trough of low pressure

Col

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#14. (For this question use annex B) Which of the following best describes Zone A?

Col

Ridge of high pressure

Depression

Trough of low pressure

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#15. What is the correct term for the descending air flow in a large high pressure area?

Convection

Subsidence

Convergence

Advection.

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#16. Which of the following is a common result of subsidence?

Clear air turbulence at higher altitudes.

An inversion over a large area with poor visibility.

CB-clouds and thunderstorms over a large area.

Wide spread NS and AS clouds and intense precipitation

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#17. What is the most likely cause of a lack of clouds at higher levels in a stationary high?

Divergence at higher levels

Sinking air

Rising air

Instability

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#18. (For this question use annex B) Which of the following best describes Zone B?

Ridge of high pressure

Depression

Anticyclone

Col

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#19. (For this question annex C) The pressure system at position “A” is a

Divergence at higher levels

Sinking air

Rising air

Instability

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#18. (For this question use annex B) Which of the following best describes Zone B?

Ridge of high pressure

Depression

Anticyclone

Col

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#19. (For this question annex C) The pressure system at position “A” is a

trough of low pressure

Anticyclone

col

secondary low

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#20. Divergence in the upper air results, near the surface, in

falling pressure and likely dissipation of clouds

falling pressure and likely formation of clouds

rising pressure and likely formation of clouds

rising pressure and likely dissipation of clouds

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#21. Where are you likely to find the strongest winds close to the ground?

Where there is little variation in pressure over a large area during the winter months

In the transition zone between two air masses

At the centre of a low-pressure system

At the centre of a high-pressure system

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#22. A blocking anticyclone on the northern hemisphere is

a warm anticyclone/quasi stationary/situated between 50°N and 70°N

quasi stationary/situated between 50°N and 70°N,/a cold anticyclone

situated between 50° and 70°N/a cold anticyclone/steering depressions

a cold anticyclone/steering depressions/situated over Scandinavia

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#23. In an area of converging air

clouds can not be formed

clouds can be formed

convective clouds can be dissolved

stratified clouds can be dissolved

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#24. (For this question use annex C) The pressure system located in area “B”

ridge of high pressure

col

trough of low pressure

depression

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#25. (For this question use annex B) Which location is most likely to have fog in the coming night?

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