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1) The arbitrary lower limit of jet core velocity has been assigned by WMO as
a) 60 kt
b) 60 m/s
c) 70 m/s
Explanation: The World Meteorological Organization (WMO) has set the arbitrary lower limit of jet core velocity at 60 knots (kt).
2) Jet stream has
a) one maxima
b) one or more maxima
c) only two maxima
Explanation: Jet streams can have one or more maxima in wind speed, indicating variations along the stream.
3) The vertical wind shear in a Jet stream is about
a) 5m/s/ km
b) 6m/s/km
c) 8m/s/km
Explanation: The typical vertical wind shear in a jet stream is approximately 5 m/s per kilometer.
4) Compared to horizontal wind shear the vertical wind shear in a Jet stream is
a) weaker
b) stronger
c) same
Explanation: Vertical wind shear in a jet stream is generally stronger than horizontal wind shear.
5) In a jet stream, the path of the maximum speed is known as
a) Core
b) Axis
c) Jet streak
Explanation: The axis of a jet stream refers to the path along which the wind speed is at its maximum.
6) The wind speed along the axis of a jet stream is always
a) Uniform
b) Not uniform
Explanation: Wind speed along the jet stream axis is not uniform, varying with jet streaks and atmospheric conditions.
7) Along the axis of a jet stream there are centres of high speed winds, these are called
a) Jet streaks
b) Core
c) Axis
Explanation: Jet streaks are regions of exceptionally high wind speeds found along the jet stream axis.
8) In a wavy jet the Jet streaks are located over or near the
a) Ridge
b) Trough
c) Between Trough and Ridge
Explanation: In a wavy jet, jet streaks are typically found over or near ridges where high-speed winds are present.
9) Sub-tropical Jet Stream (STJ) is
a) Westerly
b) Easterly
c) Southerly
Explanation: The Sub-tropical Jet Stream typically flows in a westerly direction, from west to east.
10) The normal position of Sub-tropical Jet Stream is
a) 30° N
b) 27° N
c) 35° N
Explanation: The Sub-tropical Jet Stream is typically found around 27° N latitude.
11) The southernmost position of STJ in February is
a) 22° N
b) 20° N
c) 18° N
Explanation: The southernmost position of the Sub-tropical Jet Stream (STJ) in February is approximately 22° N.
12) The STJ affects India from
a) Jun to Jul
b) Oct to May
c) Aug to Sep
Explanation: The Sub-tropical Jet Stream affects India primarily from October to May.
13) STJ has a layered structure. There are often two layers of maximum wind to the ...... of jet core
a) S
b) N
c) SW
Explanation: In the Sub-tropical Jet Stream, two layers of maximum wind are typically found to the South of the jet core.
14) The STJ strengthens
a) Northwards
b) Upstream
c) Downstream
Explanation: The Sub-tropical Jet Stream (STJ) typically strengthens downstream as it progresses.
15) At and near the STJ the temperature gradient is very
a) Small
b) Large
c) Moderate
Explanation: Near the Sub-tropical Jet Stream, the temperature gradient is typically small due to significant variations in air masses.
16) Vertical wind shear in STJ is greater ………... the core
a) above
b) below
c) along
Explanation: Vertical wind shear in the Sub-tropical Jet Stream is greater above the jet core due to the strong winds aloft.
17) The TJ prevails over the Indian Peninsula from
a) May to Jun
b) Sep to Oct
c) Jun to Aug
Explanation: The Tropical Jet (TJ) typically prevails over the Indian Peninsula from jun to aug.
18) The TJ is located over the Indian Peninsula, approximately at
a) 13° N
b) 17° N
c) 18° N
Explanation: The Tropical Jet is generally found over the Indian Peninsula at around 13° N latitude.
19) The TJ is located over India, approximately at a height of
a) 15 -16 km
b) 12 - 13 km
c) 11 - 12 km
Explanation: The Tropical Jet is found at an approximate height of 15 to 16 kilometers above the ground.
20) The TJ is strongest in
a) July - Aug
b) Sep - Oct
c) June
Explanation: The Tropical Jet is generally strongest during the Jul to aug period.
21) In the TJ the wind shears are much …… than the STJ
a) more
b) less
c) same
Explanation: Wind shears in the Tropical Jet are generally less significant than those in the Sub-tropical Jet Stream.
22) TJ is
a) Westerly
b) Easterly
c) Southerly
Explanation: The Tropical Jet Stream (TJ) is primarily a easterly wind pattern found in tropical regions.
23) A jet Stream can be recognized by
a) High level dust
b) High Pressure
c) Streaks of CI
d) Lenticular clouds
Explanation: Jet streams can often be identified by the presence of Cirrus clouds (CI), which form due to the strong winds at high altitudes.
24) Flying at right angles to a jet stream with falling pressure you will experience
a) wind from left
b) Increasing head wind
c) Increasing tail wind
d) Wind from right
Explanation: When flying perpendicular to a jet stream, falling pressure indicates an wind from left as the aircraft encounters stronger winds.
25) When and Where tropical jet stream occurs
a) All year along equator
b) In middle East in summers
c) In winters over Russia
d) In summers over SE Asia and Central Africa
Explanation: The Tropical Jet Stream typically occurs during the summer months over Southeast Asia and Central Africa due to temperature gradients.

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