Vayudoot Aviation

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

Divergence with descending air.

Divergence with lifting.

Convergence with lifting.

Convergence with descending air.

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

rising pressure and likely dissipation of clouds

falling pressure and likely formation of clouds

falling pressure and likely dissipation of clouds

rising pressure and likely formation of clouds

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

light

strong

blowing perpendicular to the isobars

changing direction rapidly

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

At the centre of a low-pressure system

In the transition zone between two air masses

At the centre of a high-pressure system

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

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

convergence and widespread ascent

convergence and subsidence

divergence and widespread ascent

divergence and subsidence

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

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

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

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

Calm winds, haze.

cumulus clouds and thunderstorms

thick low level cloud.

showers and thunderstorms.

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

at height of observatory

at a determined density altitude

reduced to sea level

at flight level

9. Subsidence is

vertically upwards motion of air

the same as convection

horizontal motion of air

vertically downwards motion of air

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

Subsidence.

Convection.

Convergence.

Advection.

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

Divergence at higher levels

Instability

Rising air

Sinking air

12. 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

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

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

13. Which of the following is a common result of subsidence?

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

Clear air turbulence at higher altitudes.

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

loses water vapour

reaches warmer layers

is heated by expansion

is heated by compression

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

Warm air undercuts a cold air mass

Cold air overrides a warm air mass

Cold air undercuts a warm air mass

Warm air overrides a cold air mass

16. In an area of converging air

convective clouds can be dissolved

stratified clouds can be dissolved

clouds can not be formed

clouds can be formed

17. 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.

Question Bank

Questions for PRESSUE SYSTEM1