Jet Streams

Question 1

The arbitrary lower limit of jet core velocity has been assigned by WMO as

Answer 1

> (a) 60 kt
(b) 60 m\s
(c) 70 m/s

Question 2

Jet stream has

Answer 2

(a) one maxima
>(b) one or more maxima
(c) only two maxima

Question 3

The vertical wind shear in a Jet stream is about

Answer 3

> (a) 5m/s/km
(b) 6m/s/km
(c) 8m/s/km

Question 4

Compared to horizontal wind shear the vertical wind shear in a Jet stream is

Answer 4

(a) weaker
>(b) stronger
(c) same

Question 5

In a jet stream, the path of the maximum speed is known as

Answer 5

(a) Core
>(b) Axis
(c) Jet streak

Question 6

The wind speed along the axis of a jet stream is always
(a) Uniform
(b) Not uniform

Answer 6

(a) Uniform
>(b) Not uniform

Question 7

Along the axis of a jet stream there are centres of high speed winds, these are called

Answer 7

> (a) Jet streaks
(b) Core
(c) Axis

Question 8

In a wavy jet the Jet streaks are located over or near the

Answer 8

> (a) Ridge
(b) Trough
(c) Between Trough and Ridge

Question 9

Sub-tropical Jet Stream (STJ) is

Answer 9

> (a)Westerly
(b) Easterly
(c) Southerly

Question 10

The normal position of Sub-tropical Jet Stream is

Answer 10

(a) 30°N
>(b) 27°N
(c) 35°N

Question 11

The southern most position of STJ is in February is

Answer 11

> (a) 22°N
(b) 20°N
(c) 18°N

Question 12

The STJ affects India from

Answer 12

(a) Jun to Jul
>(b) Oct to May
(c) Aug to Sep

Question 13

STJ has a layered structure. There are often two layers of max wind to the …….. of jet core

Answer 13

> (a) S
(b) N
(c) SW

Question 14

The STJ strengthens

Answer 14

(a) Northwards
(b) Upstream
>(c) Downstream

Question 15

At and near the STJ the temperature gradient is very

Answer 15

> (a) Small
(b) Large
(c) Moderate

Question 16

Vertical wind shear in STJ is greater ……. the core

Answer 16

> (a) above
(b) below
(c) along

Question 17

The TJ prevails over the Indian Peninsula from

Answer 17

(a) May to Jun
(b) Sep to Oct
>(c) Jun to Aug

Question 18

The TJ is located over the Indian Peninsula, approximately at

Answer 18

> (a)13°N

(b) 17°N
(c) 18°N

Question 19

The TJ is located over Indian, approximately at a height of

Answer 19

> (a) 15-16 km
(b) 12-13 km
(c) 11-12 km

Question 20

The TJ is strongest in

Answer 20

> (a) July — Aug
(b) Sep - Oct
(c) June

Question 21

In the TJ the wind shears are much …….. than the STJ

Answer 21

(a) more
>(b) less
(c) same

Question 22

TJ is
(a) Westerly
(b) Easterly
(c) Southerly

Answer 22

(a) Westerly
>(b) Easterly
(c) Southerly

Question 23

A jet stream can be recognized by

Answer 23

(a)High level dust
(b) High Pressure
>(c) Streaks of CI
(d) Lenticular clouds

Question 24

Flying at right angles to a jet stream with falling pressure you will experience

Answer 24

> (a) Wind from left
(b) Increasing head wind
(c) Increasing tail wind
(d) Wind from right

Question 25

When and where tropical jet stream occurs

Answer 25

(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