Smt Sulochanadevi Singhania School

Worksheet on Atmospheric pressure and winds

ClassVIII

LEVEL 1

Q1) Define the followings

i) Doldrumsii) Horse latitudeiii) Cycloneiv) Anticyclonev) Barographvi) Bar

Q2) Name the followings

i) Trade winds in the northern hemisphere and southern hemisphere.ii) Westerlies in the 50°S latitude.iii) The breeze experienced in the day at the coastal regions.iv) A variable wind.v) A wind which is destructive and blows over the Sahara.vi) An instrument used to measure wind speed.vii) Name the types of winds .viii) Two types of periodic winds.

LEVEL 2

Q3) Distinguish between

I) Summer monsoon and the winter monsoons.ii) Monsoons and land and sea breeze.iii) Trade winds and westerlies.iv) Variable winds and periodic winds.

Q4) Answer briefly.

i) Write two characteristics of trade winds.ii) What is the cause of the summer monsoons?iii) What is the economic importance of the monsoons to India?iv) Describe briefly the circulation of cyclones in each hemisphere.

Q5) What is shifting of the pressure belts and how does it take place?Q6) What is wind and how does it differ from air currents?Q7) What is Ferrel’s Law?Q8) Why are variable winds so called?Q9) Draw a neat labeled diagram of the pressure belts with the planetary winds.

Level 3

Q10) Give reason:i) Mountaineers carry oxygen cylinders while climbing mountains.ii) Heating leads to the rising of air.iii) Agate ,Siberia has high pressure.iv) Mediterranean lands have winter rainfall.v) Planetary winds are called as permanent winds.vi) Chinook are called as snow eaters.vii) Mistral is a cold wind.viii) High pressure region is found at 30°N and S.ix) Cyclones are prevalent in mid latitude regionsx) Pressure decreases with increase of height.xi) The human body cannot perceive the atmospheric pressure.xii) Aneroid barometer is more useful than the simple barometer.xiii) In olden days sailors avoided the doldrums.xiv) Sea breeze has a moderating effect.xv) Trade winds bring rainfall to many regions.xvi) Winds are deflected.xvii) Westerlies are called as roaring forties in the northern hemisphere.xviii) Polar winds are cold and dry .xix) Cyclones causes heavy rainfall while anticyclones are associated with clear weather

conditions.

Smt Sulochanadevi Singhania School

Worksheet on Moisture in the atmosphere.

ClassVIII LEVEL1

Q1) Define the following terms

i) Absolute humidityii) Relative humidityiii) Condensationiv) Evaporationv) Dew pointvi) Precipitationvii) ITCZ.

LEVEL2Q2) What is precipitation? Name its forms.Q3) What are the two ways by which unsaturated air is made saturate?Q4) In relation to the orographic rainfall answer the following questions

I) Why do we have higher rainfall on the wind ward side?II) What is the rain shadow region?III) Draw a neat labeled diagram of this type of rainfall.IV) Why is it called as orographic rainfall?V) What is the other name given to this rainfall?

Q5) Why is fog more dangerous than mist?Q6) Frost is harmful while dew is beneficial. Explain.Q7) Distinguish between

Evaporation ,precipitation and condensation.Fog and Smog

LEVEL3Q1) Give reason:

i) Equatorial regions have high humidity.ii) Cooling makes unsaturated air saturated.iii) On a dry day the wet bulb reading is low.iv) Clouds can float in the sky.v) Snow appears white.vi) Convectional rainfall occurs in summer in tropical lands.vii) The Northern plains gets plenty of rainfall.viii) A small difference in the wet and dry bulb thermometer reading means high

relative humidity.ix) Convective rainfall is called as the four o clock rainfall.x) Frost is dangerous to drivers .xi) Dew is seen early in the mornings.

xii) Convectional rainfall is more common in the Equatorial regions.xiii) Mumbai receives more rainfall than Pune.xiv) Dew disappears after sunrise.xv) Dew is beneficial to desert plants.

Smt Sulochanadevi Singhania School

Worksheet on Measurement of temperature and rainfall.

ClassVIII

Q1) Give reasons

i) The stevenson's screen is painted white and is kept a meter above the ground.

ii) The sides of a stevenson's screen is louvered.iii) The rain gauge is kept away from trees and buildings.iv) There is vacuum in one of the bulb of the six's maximum and minimum

thermometer.

Q2) Study the climate data given below and answer the following questions.

Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

StationA

Temp in °C

24.5 26.0 28.0 30.0 32.0 32.5 30.7 29.7 28.0 26.0 25.5 24.6

Rainfallin Cms

2.8 0.7 0.7 1.5 4.5 5.1 9.5 11.3 12.4 28.1 34.5 13.6

Station B

Temp in °C

24.4 24.4 26.7 28.3 30.0 28.9 27.2 27.2 27.2 28.3 27.2 25.0

Rainfallin cms

0.25 0.25 ____

____

1.75 50.2 61.0 37.0 27.0 4.75 1.00 ____

(i) Calculate the annual range of temperature for Station A and B.

(ii) What is the total rainfall experienced by station B(iii) Calculate the mean annual temperature of Station B and A(iv) Name the instruments used for obtaining the above mentioned data.(v) Draw a line graph to show the temperature data for the station A.(vi) Draw bar graph to show the distribution of rainfall of station B.(vii) State whether the station A has a coastal location.(viii) Draw a neat labeled diagram of a rain gauge.(ix) Why do we keep the six's maximum and minimum thermometer within a

stevenson's screen,(x) Name the other instruments kept in the stevenson's screen.

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