Vayudoot Aviation

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

at height of observatory

reduced to sea level

at flight level

at a determined density altitude

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

Divergence at higher levels

Rising air

Sinking air

Instability

3. How do air masses move at a warm front?

Warm air overrides a cold air mass

Cold air undercuts a warm air mass

Cold air overrides a warm air mass

Warm air undercuts a cold air mass

4. 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.

cumulus clouds and thunderstorms

Calm winds, haze.

showers and thunderstorms.

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

strong

blowing perpendicular to the isobars

changing direction rapidly

light

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

At the centre of a low-pressure system

At the centre of a high-pressure system

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

In the transition zone between two air masses

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

thick stratus with continuous rain.

A tendency for fog and low stratus

The possibility of snow showers.

Thunderstorms.

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

reaches warmer layers

is heated by compression

is heated by expansion

loses water vapour

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

Convergence.

Convection.

Advection.

Subsidence.

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

Divergence with descending air.

Convergence with lifting.

Divergence with lifting.

Convergence with descending air.

11. 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.

Wide spread NS and AS clouds and intense precipitation

CB-clouds and thunderstorms over a large area.

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

divergence and subsidence

convergence and subsidence

convergence and widespread ascent

divergence and widespread ascent

13. Divergence in the upper air results, near the surface, in

falling pressure and likely formation of clouds

falling pressure and likely dissipation of clouds

rising pressure and likely dissipation of clouds

rising pressure and likely formation of clouds

14. 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 convergence and upper level divergence causing widespread ascent 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 descent of air in the depression

15. Subsidence is

vertically upwards motion of air

horizontal motion of air

vertically downwards motion of air

the same as convection

16. A blocking anticyclone on the northern hemisphere is

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

a cold anticyclone/steering depressions/situated over Scandinavia

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

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

17. In an area of converging air

clouds can be formed

convective clouds can be dissolved

stratified clouds can be dissolved

clouds can not be formed

Question Bank

Questions for PRESSUE SYSTEM1