Some Natural phenomena 8

Question 1

Tornados generally occur in the regions of

Answer 1

Atlantic Ocean

Question 2

Speed of tornadoes

Answer 2

Weak - 50 to 60 km per hr

Strong - 400 km per hr

Question 3

Speed of the wind is measured by

Answer 3

Anemometer

Question 4

Word monsoon derived from the word

Answer 4

Mausam (Arabic - means season)

Question 5

In America cyclones are referred as

Answer 5

Hurricanes

Question 6

In Philippines and Japan cyclones are referred as

Answer 6

Typhoon

Question 7

Gales

Answer 7

Winds moving at high speed

Question 8

In land , the crust has an average thickness of

Answer 8

40 km

Question 9

In oceans,the crust has an average thickness of

Answer 9

10-12 km

Question 10

Mantle length

Answer 10

2900 km (approx.)

Question 11

Density of mantle

Answer 11

Increases with depth - 3.5 to 5.5 gram/cm3

Question 12

Mantle contains

Answer 12

Silicate minerals rich in magnesium and iron.

Question 13

Outer core contains

Answer 13

Iron and nickel in molten state. Also sulphur

Question 14

Outer mantle thickness

Answer 14

2300 km

Question 15

Inner core thickness

Answer 15

1300 km

Question 16

Inner core contains

Answer 16

A solid ball made of iron

Question 17

Lithosphere

Answer 17

Crust and upper layer of mantle together called

Question 18

An Earthquake is the fracture in the

Answer 18

LITHOSPHERE

Question 19

The crust is divided into

Answer 19

7 large plates and several smaller ones

Question 20

Plate tectonics -

Answer 20

THEORY that tells that the surface of the earth is made of several lithospheric plates.

Question 21

Himalayas is believed to be formed by the collision of

Answer 21

Eurasian plate and Indian plate.

Question 22

A fault is

Answer 22

A crack in the Earth’s crust.

Question 23

Focus (seismology) -

Answer 23

Point where Earthquake occurs

Question 24

Epicentre situation

Answer 24

Above the focus of the Earthquake ; on the surface.

Question 25

San Andreas fault is situated in

Answer 25

California

Question 26

San Andreas Fault marks the boundary between

Answer 26

Pacific plate and North American Plate

Question 27

Seismograph also called

Answer 27

Seismometer

Question 28

The output in a seismograph called

Answer 28

Seismogram

Question 29

Mild Earthquake; Richter scale reading -

Answer 29

0 - 2.9

Question 30

An increase of 1 on Richter scale means

Answer 30

A 30-fold increase in energy.

Question 31

Liquefaction

Answer 31

Process by which water saturated soil ; loses strength and acts like a fluid.

Question 32

Bhuj earthquake , when ?

Answer 32

26 January 2001 in Gujarat (90000 people)

Question 33

Kashmir earthquake

Answer 33

Struck indo-Pakistan border on 8 October 2005, magnitude- 7.6. (50000 people)

Question 34

Some earthquakes in Nepal

Answer 34

25 April and 12 May 2015 (7.8-8.1)

Question 35

Most earthquake prone country

Answer 35

Indonesia

Question 36

San Andreas fault dimensions

Answer 36

1000 km long

9 metres deep

Question 37

An Indian state in which earthquake has a great chance of occurring

Answer 37

Gujarat

Question 38

Tsunami width and speed

Answer 38

Width - 100 to 200 km

Speed - 700 to 800 km/hr

Question 39

During lightning air is heated to

Answer 39

30,000 °C

Question 40

Position of charges in a cloud

Answer 40

-ve charges in base

+ve charges in top

Question 41

How much Electric current flows during a lightning strike

Answer 41

10000 - 20000 amperes

Question 42

Strobe effect

Answer 42

Brightening and dimming of lightning