what happens to the air above the equator what happens to the air above the poles

These NCERT Solutions for Class seven Science Affiliate 8 Winds, Storms and Cyclones Questions and Answers are prepared by our highly skilled subject area experts to assist students while preparing for their exams.

Winds, Storms and Cyclones NCERT Solutions for Class seven Science Chapter 8

Class seven Science Chapter eight Winds, Storms and Cyclones Textbook Practise Questions and Answers

Question i.
Fill the missing give-and-take in the bare spaces in the following statements:
a. Wind is ……………… air.
b. Winds are generated due to ……………… heating on the earth.
c. Well-nigh the earth's surface ……………… air rises up whereas ……………… air comes down.
d. Air moves from a region of ……………… pressure level to a region of ……………… pressure level.
Reply:
a. moving
b. uneven
c. warm, cooler
d. high, low

Question 2.
Suggest 2 methods to find out wind direction at a given place.
Answer:
Two methods to detect the direction of air current are:

1. Take a scattering of sand or grit. Release it slowly from a peak and find the management in which the falling sand is moving. This volition bear witness the direction of current of air.
2. Tie a sparse plastic sheet or material with a stick. Keep the stick at a place which is as high as possible. The direction in which the cloth sways shows the management of current of air.

Question 3.
Country two experiences that made y'all call up that air exerts pressure level (other than those given in the text).
Answer:

1. A parachute helps the people in reaching the ground safely. The air force per unit area reduces the speed of the parachute and the paratrooper lands without getting injured.
2. Ink can be filled in a fountain pen with the assistance of atmospheric pressure. When the tube of the pen is squeezed, the air in it rushes out so that the pressure in the tube decreases. The air pressure level outside the tube now pushes the ink into the pen.

Question four.
You want to buy a house. Would you like to buy a firm having windows but no ventilators? Explain your answer.
Respond:
No, a business firm should have ventilators forth with windows. This is because the warm air would ascent upwards and leave from the ventilators. The cooler air would rush in through the windows. This volition assist in making the rooms comfortable. A room without ventilators shall not be cooled as efficiently as the one with ventilators.

Question 5.
Explicate why holes are made in hanging banners and hoardings.
Answer:
Banners and hoardings are usually very large. The air pressure considering of the moving air tin can blow away the banners. Holes are fabricated in banners and hoardings so that the wind can move through them. This helps in reducing the bear on of air pressure on the hoardings and thus they are not diddled away.

Question vi.
How will you help your neighbours in case cyclone approaches your village/ town?
Answer:
Nosotros will accept following steps to help our neighbours in example of whirlwind:

• Nosotros will help them to shift to a safer place.
• Nosotros will organise a community kitchen during the stress flow.
• We will provide first help to injured people.
• We will likewise arrange for safe drinking water for the people.
• We will congenital temporary safe shelter for them.

Question vii.
What planning is required in advance to bargain with the situation created by a cyclone?
Reply:
Following planning is required to bargain with the situation created by a cyclone:

• Proper shelters should be built by the authorities agencies so that people can be accommodated in them.
• Alternate arrangements of seamless communication among rescue agencies should be made.
• Proper stock of emergency medicines should be kept.
• Proper arrangements of safe drinking water should be made.
• Authorities should chalk out a rehabilitation plan for those affected past cyclone.

Question 8.
Which ane of the post-obit place is unlikely to be affected by a cyclone?
(a) Chennai
(b) Mangaluru (Mangalore)
(c) Amritsar
(d) Puri
Respond:
(c) Amritsar

Question 9.
Which of the statements given below is right?
a. In winter the winds flow from the land to the ocean.
b. In summertime the winds flow from the land towards the bounding main.
c. A cyclone is formed past a very loftier-force per unit area system with very highspeed winds revolving around information technology.
d. The coastline of India is not vulnerable to cyclones.
Answer:
a. In winter the winds flow from the land to the ocean.

NCERT Extended Learning Activities and Projects

Question i.
You tin can perform the Action 8.five (of NCERT textbook) in the chapter slight differently at abode. Employ two plastic bottles of the same size. Stretch ane balloon on the neck of each bottle. Keep one bottle in the dominicus and the other in the shade. Record your observations. Compare these observations and the result with those of Activeness 8.v (of NCERT textbook).

Hint:
The balloon kept in the sunday will become slightly inflated as the air is hot in sun. Notwithstanding, the balloon in shade volition contract as the air is libation.

Question ii.
Y'all can make your ain anemometer. Collect the following items: 4 small newspaper cups (used ice foam cups), 2 strips of cardboard (xx cm long and 2 cm wide), gum, stapler, a sketch pen and a sharpened pencil with eraser at one end.

Take a scale; draw cross on the cardboard strips as shown in the figure. This will give you the centres of the strip.

Fix the strip at the center, putting ane over the other and so that they make a plus (+) sign. Now set up the loving cup at the end of the strips. Colour the outer surface of one cup with a marker or a sketch pen. All the four cups should face in the aforementioned management.

Push a pin through the centre of the strips and attach the strips and the loving cup to the eraser of the pencil. Check that strips rotate freely when you blow air on the cups. Your anemometer is set up. Counting the number of rotations per minute will give you an estimate of the speed of the air current. To detect the changes in the air current speed, use it at different places and at unlike times of the mean solar day. If you practise not have a pencil with fastened eraser you can use the tip of a ball pen. The only status is that the strips should rotate freely.
Recollect that this anemometer volition indicate only speed changes. Information technology will not give you the actual wind speed.
Hint:
Do it yourself with the help of the process suggested in the question.

Question three.
Collect manufactures and photographs from newspapers and magazines about storm and whirlwind. Brand a story on the basis of what you lot learnt in this affiliate and the matter nerveless by you.
Hint:
Do it yourself.

Question iv.
Suppose you are a fellow member of a committee, which is responsible for creating development programme of a costal state. Prepare a short oral communication indicating the measures to be taken to reduce the suffering of the people caused by cyclones.
Hint:
Equally concerned members of a development plan commission, it is important that we must take proper precautions in advance to reduce the suffering and destruction to a great limit. The warning must be issued in advance and people must stay away from the sea. They must proceed essential commodities with them and must move to safer places in advance. Water, medicines, nutrient, etc., must exist kept in handy to handle the difficult state of affairs in future. They should exist requested to keep gear up the telephone number of emergency services like law, burn down brigade and medical centres, etc.

Question 5.
Interview eyewitness to collect the actual experience of people affected by a cyclone.
Hint:
Practice information technology yourself.

Question six.
Take an aluminium tube about 15 cm long and one to one.5 cm in diameter. Cut slice of a medium-sized tater about 2 cm thick. Insert the tube in the slice, press it, and rotate it 2-three times. Remove the tube. You will notice a piece of potato stock-still in the tube like a piston caput. Echo the same process with the other end of the tube. At present you lot have the tube with both ends airtight past spud pieces with an air column in between. Take a pencil with one end unsharpened. Identify this end at one of the pieces of white potato. Press information technology suddenly to push the potato slice in the tube. Detect what happens. The activity shows rather dramatically how increased air pressure can button things.
Caution: When you perform this action, make sure that nobody is standing in forepart of the tube.

Hint:
Y'all will observe that the potato piece on the other side of the tube is blown away. This happens because the air inside the tube exerted pressure on the potato slice.

Activity 1

Objective: To show that loftier speed winds are accompanied past reduced pressure.
Materials Required: An empty bottle and a piece of paper.
Procedure:

• Crumble a pocket-sized piece of newspaper into a ball of size smaller than the mouth of an empty bottle.
• Hold the empty canteen on its side and place the paper brawl just inside its mouth.
• Now try to blow on the ball to force information technology into the canteen.
• At present repeat the activeness with bottles of unlike sizes.

Observation: Information technology is very difficult to forcefulness the paper ball into the bottle. In most cases, the ball falls out of the canteen.
Conclusion: Since the pressure within the canteen get college than that outside the canteen when air is blown, the paper ball doesn't go inside. In fact, the ball comes out of the bottle.

Activity 2

Objective: To show that high speed wind causes low pressure level.
Materials Required: Two balloons of approximately equal size, h2o, a rod and a cord.
Procedure:

• Accept two balloons of approximately equal size.
• Put a little water in the balloons.
• Blow upwards both the balloons and tie each one to a string.
• Hang the balloons 8-10 cm autonomously on a cycle spoke or a stick.
• Blow in the space betwixt the balloons.

Observation: The balloons move inward towards each other when air is diddled between them.
Determination: Since the pressure at the outer parts of the balloons is college than in between them, the balloons move towards each other.

Activity 3

Objective: To show that moving air can provide lift.
Materials Required: A strip of newspaper.
Procedure:

• Have a strip of paper. Hold one end of information technology. The other finish drops down due to gravity.
• Now identify it close to your oral cavity and blow on top of it.

Ascertainment: The paper is pushed upwardly.
Conclusion: Loftier speed air reduces pressure above paper strip, then the strip moves up from high force per unit area expanse to low force per unit area surface area. Hence, moving air can provide lift.

Hot Air and Cold Air: When the air is heated, it expands. As a result, it occupies more infinite and becomes lighter in weight. Therefore, nosotros can say that warm air is lighter in weight and common cold air is heavier.

Action 4

Objective: To demonstrate that warm air is lighter than cold air.
Materials Required: Two paper cups of same size, a metallic or a wooden stick, a piece of thread and a candle.
Procedure:

• Take two paper cups of the same size.
• Hang the two cups in the inverted position at the two ends of a metal or a wooden stick.
• Tie a slice of thread in the heart of the stick.
• Hold the stick by the thread.
• Put a called-for candle below 1 of the cups as shown in the figure and detect.

Observation: Hot air from candle goes within one of the paper bags. The other pocketbook has normal air. The pocketbook to a higher place the candle flame rises higher.
Conclusion: Hot air, being lighter than normal air, moves up and takes the paper purse up with it. The other purse has cooler air, hence it goes downwards.

Warm air rises up, whereas comparatively cooler air tends to move towards the earth's surface. When warm air rises up, air pressure there is reduced and the cooler air moves in to that place.

Generation of Air current Currents Due to Uneven Heating on the World: There are ii situations where winds are generated on the earth:
i. Uneven heating betwixt the equator and poles causes the n-southward winds. The equatorial regions receive maximum sunlight and are hence warm. The hot air from equator rises up and a cooler air from 0°-30° breadth on either sides of the equator moves in. Similarly, polar air is cooler than air in nearly sixty° breadth. Hence, cool air moves from poles towards warmer latitudes. These air currents tend to modify direction considering of the rotation of the globe.

ii. Uneven heating of state and water causes monsoon winds on the earth which bring rainfall. State gets heated upwards and cooled down faster than water. Hence, air over the land gets heated in summertime and rises while cold air from oceans rushes towards land. These are monsoon winds.

Monsoon Winds: The flow of moist air from oceans towards land in summer is chosen monsoon or monsoon wind. The term 'Monsoon' had traditionally been used to describe the typical climate of the Indian Peninsula during the rainy season. Present, the term 'Monsoon' is as well beingness used to describe the similar climate in other parts of the world. Monsoon winds deport water vapour which falls over the land in the course of rain after cooling down. In Bharat, the harvest depends on the monsoon wind considering it is the major gene for bringing rainfall in India.

Thunderstorm: Thunderstorm occurs frequently in hot and humid tropical areas, such as India. In summer, the air rises up along with lot of wet. Afterwards ascent up to a certain height, h2o vapour cools downward and starts coming down in the grade of water droplets. The swift drifting of h2o droplets along with rising air creates electric charge amid clouds. This manifests in the form of lightning and sound. This is known as thunderstorm.

Precautions during a thunderstorm:

• Do not prevarication on the ground or take shelter under a tall tree.
• Do non deport umbrella with metallic cease.
• Do not sit almost a window.
• Practice not stay inside water bodies.
• Practice not take shelter in open up garages, storage sheds, metal sheds, etc.

Cyclone: Fast moving air towards a center, commonly with heavy rain, is known as cyclone. Wind direction, current of air speed, humidity and temperature together create cyclone. When water vapour in the clouds cools down, it releases rut. This rut warms the air around the clouds. The warm air rises up and creates a low force per unit area zone. This low force per unit area zone is quickly filled in by cooler air from the surrounding. This creates a system in which the centre is having very low pressure level and is surrounded by high speed winds moving around information technology. The wind from the surroundings moves in a circular fashion towards the eye and gives ascension to cyclone. In this way, a thunderstorm tin manifest itself into a cyclone.

Structure of a cyclone: Cyclone is nearly 10-15 km high. Its centre is a calm area and is called the heart. The bore of the eye varies from x-xxx km and it is free of clouds with low-cal winds. Around eye, there is a cloud region of 150 km having high speed winds, thick clouds and heavy rain. Current of air speed gradually decreases away from this region.

The germination of a cyclone depends upon unlike factors:

• The temperature of the place
• The wind speed
• The direction of the winds
• The humidity of the place

Tropical cyclones are also chosen Hurricane in USA and Typhoon in Japan and Philippines.

Devastation caused by Cyclones: It pushes huge water waves towards the land, as high every bit 3-12 k. Hence, sea water floods the coastal areas causing loss of life and holding. Soil too becomes infertile due to seawater. Houses are damaged and communication systems are destructed.

Tornado: A tornado is a violently rotating dark funnel shaped deject that reaches from the sky towards the ground. Bore of a tornado ranges from few metres to a km. It grows bigger by taking dust and anything else nigh its base of operations because of low force per unit area. Smaller tornadoes can only make dust rotate with itself whereas a bigger tornado can take vehicles or fifty-fifty houses. Precautions: During tornado, shut all windows, take shelter under a table, bench, etc. Take safe position by bowing downwardly on knee and protecting head and cervix. A tornado shelter is an surreptitious room with no windows.

Precautions: During tornado, close all windows, take shelter nether a table, bench, etc. Accept safety position by bowing down on knee joint and protecting head and neck. A tornado shelter is an hush-hush room with no windows.

Effective Safe Measures: Following prophylactic measures should exist adopted in case of a thunderstorm or cyclone.
i. On part of the government:

• With help of satellites and radars, a whirlwind alarm or cyclone sentry is issued 48 hours in accelerate of whatever tempest.
• A cyclone warming is issued 24 hours in advance.
• Rapid communication of warnings is done to the government agencies, ports, fishermen, ships and general public.
• Whirlwind shelters are constructed in cyclone-prone areas.

ii. On part of the people:

• Avoid driving on roads through standing h2o.
• Proceed the phone numbers of all emergency services like police, fire brigade, etc., ready.
• Do not drink water that could be contaminated.
• Do not touch wet switches and fallen power lines.
• Cooperate with your neighbours, friends and rescue strength.

Course 7 Science Chapter 8 Winds, Storms and Cyclones Additional Important Questions and Answers

Very Brusque Answer Type Questions

Question 1.
What is wind?
Answer:
The moving air is called current of air.

Question 2.
Does air exert pressure?
Answer:
Yes, air exerts pressure.

Question 3.
Name the musical instrument which measures the wind velocity.
Answer:
Anemometer.

Question 4.
From which discussion is the term monsoon derived?
Answer:
The word monsoon is derived from the Arabic word mausam which means season.

Question 5.
What are the other names of cyclones?
Answer:
Hurricane and Typhoon.

Question 6.
What is tornado?
Reply:
A night funnel shaped cloud that reaches from the sky to the ground is called tornado.

Question 7.
What is a air current storm?
Answer:
A wind storm is just a tempest with high speed violent winds but with little or no pelting.

Question 8.
What is hurricane?
Respond:
Tropical cyclones are also called Hurricane in United states of america.

Question ix.
What is air?
Answer:
Air is a mixture of gases.

Question x.
What is thunderstorm?
Answer:
Many a times, rain is associated with lightning and roaring sound. Rain with lightning is chosen thunderstorm.

Question 11.
What are cyclones?
Answer:
The weather condition of formation of a very low pressure system with very loftier speed winds revolving around it, accompanied by heavy rain is called a cyclone.

Question 12.
What are the two technologies which assistance in making the forecast of a cyclone?
Reply:
Satellites and radars.

Question 13.
Which factor increases the speed of wind?
Respond:
Reduction of air pressure increases wind speed.

Question xiv.
What is wind vane?
Answer:
An instrument used to find the management of the wind is called wind vane.

Question 15.
Which expanse of a cyclone is calm, free of clouds and has just lite winds?
Reply:
Centre of the cyclone called the eye of whirlwind.

Question xvi.
In which direction does air exert maximum pressure?
Answer:
Air exerts pressure as in all directions.

Question 17.
What happens to the air, when temperature is increased?
Respond:
On heating, the air expands and becomes lighter.

Question 18.
What are the factors which contribute to the development of cyclones?
Answer:
Wind speed, current of air direction, temperature and humidity contribute to the evolution of cyclones.

Question nineteen.
Why is warm air lighter than cold air?
Reply:
Air expands on heating. Due to expansion, air occupies more space (book). As a result, density decreases and information technology becomes lighter. Thus warm air is lighter than the cold air.

Short Answer Type Questions

Question ane.
What causes lightning during a thunderstorm?
Answer:
Static electricity or charge is produced due to the collisions between water droplets and water ice crystals in the temper. This causes huge sparks between clouds or betwixt a cloud and the ground in the form of lightning during a thunderstorm.

Question 2.
Depict the 'eye of a cyclone'.
Answer:
At the eye of the cyclonic storm is a at-home, cloudless expanse. This is chosen the eye. Its bore may vary from 10 km to 30 km. In that location is no pelting here and the winds are fairly calorie-free.

Question 3.
Explain why a rubber sucker pressed on a shine surface gets stuck to it.
Respond:
Rubber sucker when pressed confronting a flat smoothen surface, forces air between the smooth surface and the sucker out. This reduces air pressure in the infinite between the sucker and the smooth surface. At that place is greater air force per unit area outside. Hence, this outside air pressure level firmly presses the prophylactic sucker to the polish surface and information technology gets stuck.

Question iv.
A child blows air with a harbinger near the opening of some other straw which has its other stop in a soft drink canteen. What do you think will happen and why?
Answer:
The level of soft potable volition rise in the bottle. This will happen because the air pressure is reduced in a higher place the straw and hence the drinkable will ascent in it due to a greater air pressure level inside.

Question 5.
Explicate why smoke and hot air balloon always rises upwards.
Answer:
Smoke goes up because it is lighter than air. In the instance of smoke, it'south density is less than that of the surrounding air and thus it rises. The same goes for a hot air balloon. The density of the hot air trapped inside a balloon is less than that of the surrounding cooler air and hence it makes the airship rise.

Question 6.
What is thunderstorm? How does it develop?
Reply:
In summer, the air rises up forth with lot of moisture. After rising upward to a certain peak, water vapour cools downward and starts coming downwards in the form of h2o droplets. The swift drifting of water droplets and rising air creates electricity amidst clouds. This manifests in the class of lightning and audio. This is known equally thunderstorm.

Question 7.
Which regions of India are vulnerable to cyclones?
Reply:
The whole coastline of India is vulnerable to cyclones, specially the eastern coast. The w coast of Bharat is less vulnerable to cyclonic storms both in terms of intensity and frequency of the cyclones.

Question eight.
How does air move?
Reply:
Air moves considering of difference in air pressure. Air moves from the region where the air pressure level is high to the region where the pressure is low. The greater the deviation in pressure, the faster the air moves. Also, pressure variation occurs in air due to uneven heating in different regions.

Question ix.
List some effective safety measures that should be taken by the government for dealing with whirlwind.
Answer:
Some effective safety measures are:

• A cyclone forecast and warning service.
• Rapid communication of warnings to the regime agencies, the ports, fishermen, ships and to the general public.
• Construction of cyclone shelters and administrative arrangements for moving people to safer places.

Question 10.
What are the destructions caused by cyclones?
Answer:
As a issue of cyclone, the seawater enters the low-lying coastal areas, causing severe loss of life and holding. It also reduces the fertility of the soil. Continuous heavy rainfall may further worsen the flood situation. Loftier-speed winds accompanying a cyclone can damage houses, telephones and other communication systems, copse, etc., causing tremendous loss of life and property.

Question 11.
List some deportment on the function of people in case of a whirlwind.
Answer:
Actions on the part of people in case of whirlwind are:

• We should not ignore the warnings issued by the meteorological section through TV, radio or newspapers.
• We should make necessary arrangements to shift the essential household goods, domestic animals and vehicles, etc., to safer places.
• We should avoid driving on roads through standing water, as floods may take damaged the roads.
• Nosotros should keep ready the telephone numbers of all emergency services similar constabulary, burn down brigade and medical centres.

Question 12.
What precautions should we take if a storm is accompanied by lightning?
Answer:
If a storm is accompanied by lightning, we must take the following precautions:

• Do not take shelter under an isolated tree. If you are in a forest, take shelter under a pocket-sized tree. Do not lie on the basis.
• Do not have shelter under an umbrella with a metallic cease.
• Do not sit near a window. Open garages, storage sheds, metallic sheds are non condom places to take shelter.
• A car or a bus is a safe identify to accept shelter.
• If you are in water, exit and go inside a building.

Question 13.
What is an anemometer? Explain its construction and working.
Answer:
An anemometer is used to measure the wind speed at a detail place. Anemometers come in a variety of forms merely the simplest type is the cup anemometer. Information technology consists of vertical pole with 4 horizontal cups attached to the ends of the four artillery. Wind causes the cups to rotate the arms around the vertical pole. If current of air is blowing very fast, then the speed with which the cups rotate will increase. This can give a relative estimate of wind speed.

Long Answer Type Questions

Question 1.
How are wind currents generated? Explain.
Answer:
Depending on the locations involved, 2 situations are possible:
a. Regions close to the equator get maximum heat from the Sun. The air in these regions gets warm. The warm air rises and the cooler air from the regions in the 0-30 degrees latitude belt on either sides of the equator moves in. These winds blow from the north and the s towards the equator. At the poles, the air is colder than that at latitudes about threescore degrees. The warm air at these latitudes rises up and the cold current of air from the polar regions rushes in to take its place. In this mode, wind circulation is prepare from the poles to the warmer latitudes.

b. Uneven heating of the land and water on the earth besides causes current of air currents. Land gets heated upwardly and cooled downward faster than water. Hence, air over the state gets heated in summer and rises while cold air from oceans rushes towards land. These are monsoon winds.

Question two.
Explain the formation of a cyclone?
Answer:
Fast moving winds towards a centre, unremarkably with heavy rain, is known as whirlwind. Wind direction, air current speed, humidity and temperature together create cyclone. When water vapour in the clouds cools down, it releases oestrus. This heat warms the air around the clouds. The warm air rises up and creates a low pressure zone. This depression pressure level zone is speedily filled in by cooler air from the surrounding. This creates a system in which the centre is having very low pressure and is surrounded by loftier speed winds moving effectually information technology. The current of air from the surroundings moves in a round manner towards the centre and gives rise to cyclone.

Question 3.
Explain with the aid of an activeness that an increase in the speed of air results in the drop of pressure.
Reply:
Take ii balloons of approximately equal size. Put a little h2o into the balloons. Blow up both the balloons and tie each i to a cord. Hang the balloons viii-10 cm apart on a bicycle spoke or a stick. Blow in the space between the balloons. Nosotros will observe that the freely suspended balloons move towards each other. The reason is, when high speed air moves through the gap in between the balloons, the force per unit area of air falls in the gap. Thus, air at high pressure on the sides of balloons forces them in.

Question four.
Write an experiment to show that on heating, the air expands and occupies more infinite.
Answer:
Take two paper numberless or empty paper cups of the aforementioned size. Hang the two bags in the inverted position on the two ends of a metallic or wooden stick. Necktie a piece of thread in the centre of the stick. Hold the stick by the thread as in a remainder. Put a burning candle below one of the numberless. We will meet that the balance of the numberless gets disturbed. This happen because equally the warm air rises upward, it pushes the handbag above the candle higher.

Question v.
How does mod technology help united states to predict cyclones in accelerate?
Answer:
Modem technology helps us in fol lowing ways:

• Satellites and radars helps in forecasting cyclones.
• Cyclone alert or cyclone lookout man is issued 48 hours in advance of any expected storm.
• Whirlwind warning is issued 24 hours in advance.
• The message is broadcasted every hour or half an hour when cyclone is nigh the coast.
• Several national and international organisations cooperate to monitor the cyclone related disaster.

Question half-dozen.
Describe the formation of a tornado.
Reply:
A tornado is a weather condition when a cloud having a nighttime funnel-shape reaches from the sky to the ground. The bore of a tornado can range from ane metre to several kilometres. The tornadoes tin be formed inside cyclones as well. In a tornado, winds blow at loftier speed of 300 km per hour.

The funnel-like shape of a tornado sucks everything that comes near it at the base of operations because of the low pressure exerted by the winds. It then throws the things upwards. Hence, tornados can exist devastating.

Picture-Based Questions

Question ane.
Figure shows a diagrammatic representation of trees in the afternoon forth a sea coast. Land on which side A or B is the ocean located. Give reason for your choice.

Answer:
In the afternoon, the wind blows from sea to country as air pressure on the land is less than the force per unit area above the ocean. Hence, the sea is on B side.

Question 2.
Wait at the picture of a whirlwind approaching the coast of Orissa. Write the dates of the cyclones.

Answer:
a. Date of start cyclone: 18 October 1999.
b. Date of second whirlwind: 29 October 1999.

Question 3.
Await at the following diagram and answer the post-obit questions:

a. Which bag (1) or (2) contains hot air?
b. What does this activity show?
Answer:
a. Pocketbook (1) contains hot air.
b. This activeness shows that hot air is lighter and rises upward.

NCERT Solutions for Class vii Scientific discipline

• Class seven Science Affiliate ane Diet in Plants
• Class 7 Science Chapter 2 Nutrition in Animals
• Class seven Science Chapter 3 Fibre to Material
• Class 7 Scientific discipline Chapter four Heat
• Grade 7 Science Chapter 5 Acids, Bases and Salts
• Form 7 Scientific discipline Chapter 6 Concrete and Chemic Changes
• Form 7 Science Affiliate 7 Weather, Climate and Adaptations of Animals of Climate
• Grade vii Science Chapter eight Winds, Storms and Cyclones
• Form 7 Science Affiliate ix Soil
• Class seven Science Affiliate 10 Respiration in Organisms
• Class 7 Science Chapter 11 Transportation in Animals and Plants
• Grade 7 Science Chapter 12 Reproduction in Plants
• Class 7 Science Chapter xiii Motion and Time
• Class 7 Science Affiliate 14 Electric Current and its Effects
• Course 7 Science Chapter 15 Light
• Class 7 Science Affiliate 16 Water: A Precious Resource
• Course 7 Scientific discipline Chapter 17 Forests: Our Lifeline
• Class vii Scientific discipline Chapter 18 Wastewater Story

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