met 13

316) The condition necessary for the formation of a thunderstorm are:

• a) Steep lapse rate, strong winds

• b) shallow lapse rate, adequate supply of moisture

• c) Steps lapse rate ,adequate supply of moisture and trigger action.

317) Hail is most likely to fall from a cloud

• a) Having layers

• b) Composed of Ice crystals

• c) Having strong vertical development

318) Norwesters are

• a) The western disturbances which affect NW India

• b) Severe thunderstorms which occur over NE India during hot weather period

• c) Severe thunderstorms which occur over Peninsula during hot weather period

319) Dust Storm usually occurs over NW India during

• a) Post-monsoon

• b) Winter

• c) Pre-Monsoon

320) A 'mature' thunderstorm has

• a) updraft only

• b) downdraft only

• c) updrafts and downdrafts

321) Aircraft icing is most favoured in the cloud which have temperatures ranging between

• a)20°C and 40°C

• b) 0°C and -20°C

• c) below 40 ° C

322) A short duration, showery precipitation is associated with

• a) ST

• 1. b)  AS

• 1. c)  CB

323) Hail is

• 1. a)  Solid precipitation which commonly occurs over the mountainous regions in winter.

• 1. b)  Frozen or partly frozen rain falling from sheet type of clouds

• 1. c)  Solid precipitation falling from a deep convective cloud

324) The most hazardous cloud for aviation is

• a) CB

• b) CU

• c) NS

325) The life of a Cb cell is usually

• 1. a)  7 to 8 hrs

• 1. b)  3 to 4 hrs

• 1. c)  2-3hr