Question 1

Winds are generated due to ___________ heating on the earth.

Accepted Answer

Wind is air in motion. It is produced by the uneven heating of the earth's surface by the sun. Since the earth's surface is made of various land and water formations, it absorbs the sun's radiation unevenly. Two factors are necessary to specify wind: speed and direction.

Question 2

What are the precautions one must take when one is in a cyclone-hit area ?

Accepted Answer

Few precautions to be followed during cyclones are:Fill buckets, sinks and baths with water in case the water supply becomes restricted.Gather everyone indoors including any pets.Stay away from doors, windows and exterior walls.Turn off all electricity, gas and water and unplug all appliances.

Question 3

Which of the following is a natural disaster?

Accepted Answer

A natural disaster is a major adverse event resulting from natural processes of the Earth; examples include floods, hurricanes, tornadoes, volcanic eruptions, earthquakes, tsunamis, and other geologic processes.

Question 4

High speed winds are accompanied by :

Accepted Answer

The correct answer is option(B).Winds move from a place of higher pressure to a place of lower pressure resulting in increase in the speed of winds. Accordingly, during storm the pressure becomes low due to which high speed winds prevail. also wind speed increases due to pressure gradient.Hence, high speed winds are accompanied by reduced pressure.

Question 5

Fill in the blanks.Air moves from a region of _______ pressure to a region of ________ pressure.

Accepted Answer

As we know air moves from the region where the air pressure is high to the region where the pressure is low.

Question 6

Fill in the blanks.i) Air around us exerts ________.ii) The moving air is called _________.iii)  The main cause of wind movement is uneven_______________ on the earth.iv) High speed wind can cause cyclone in regions of ______________pressure.

Accepted Answer

i) Pressure.ii) Wind.iii) Heating.iv) Low.

Question 7

A flag mounted on a flag post near the sea coast flutters inthe direction of sea. At what time of the day doesthis happen at midnight or in the afternoon?

Accepted Answer

This incident , the flag will flutter in the direction of sea when it is midnight because at night time the sea becomes more hot than land and the air above sea traps heat and rises up due to which pressure difference is created and the cool air above land reaches the sea in order to maintain balance , so the flag will flutter in the direction of sea at midnight time and this phenomena is also called land breeze.

Question 8

Which of the following place is most likely to be affected by a cyclone?

Accepted Answer

As we know that East coast is more likely to face cyclones with great speed(intensity) and number of cyclones than the west coast and except Puri all other places are in West coast and Puri is in East coast.

Question 9

Suggest two methods to find out wind direction at a give place.

Accepted Answer

Two methods are:(i) Take a piece of paper in your hand. Allow it to fall from your hand. It will flow in the direction in which wind is blowing.(ii) You can also use a wind-pane which helps us to know the accurate wind direction.

Question 10

State whether the following statements are True or False:i) If wind flows from land to the ocean, then it is daytime.ii) A very high-pressure system, with very high-speed wind surrounding it forms a cyclone.iii) The coastline of India is not vulnerable to cyclones. iv) Warm air is lighter than cool air.

Accepted Answer

(i). False.If wind flows from ocean to the land then it is daytime and is called sea breeze, because in daytime the land gets heated and the air above it expands and rises up, and there is the formation of low pressure are above it. (If wind flows from ocean to land then it is daytime and in the opposite condition it is night time.)(ii). False.A cyclone is a natural disaster caused by the warming of air by water vapors through ocean and revolving of high-speed winds around a low-pressure area.(not a high-pressure area)(iii). False.The coastlines of India are highly vulnerable to cyclones and also the east coast is more vulnerable to cyclones with high speed and with a high number of cyclones.The two cyclones in Odisha are an example of the vulnerability of cyclones to India. (The east coast is more likely to welcome cyclones.)(iv). True.As we know that warm air expands and has low pressure and hence it has the same mass but expanded volume or space, hence it rises up and is said that it is lighter than cool air.For example &#8211; the sea breeze and land breeze system prove the fact.