NCERT Solutions for Class 7 Science Chapter 8 Winds, Storms and Cyclones
Here you will find NCERT Solutions for Class 7 Science Chapter 8 Winds, Storms and Cyclones will be useful in expanding student's horizon as it cover variety of questions. Through these NCERT Solutions, students should not waste time and adopt a strategy that helps them operate and learn at maximum efficiency. It will improve your awareness skills sharply and you can easily memorize more things precisely.
Chapter 8 Winds, Storms and Cyclones NCERT Questions and Answers can be used to enrich knowledge and make lessons for learners more exciting. You will get step by step and to the points answers of every question given inside the textbook. Your marks play an important role in shaping future thus these NCERT Solutions for Science will become your comprehensive guide in easy learning and evaluating yourself.
NCERT Solutions for Class 7 Science Chapter 8 Winds, Storms and Cyclones
NCERT Textbook will provide you with a lot of interesting topics thus these NCERT Solutions for Class 7 Science for Chapter 8 will be useful in understanding in depth concepts well. Detailed explanation provided under each NCERT solutions for Class 7 Science will help in understanding the concepts better. In the examinations, you will can come up with better answers and lay out the main point effectively.
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Page No: 92
1. Fill the missing word in the blank spaces in the following statements:
(a) Wind is __________ air.
(b) Winds are generated due to __________ heating on the earth.
(c) Near the earth’s surface __________air rises up whereas ___________ air comes down.
(d) Air moves from a region of __________ pressure to a region of __________ pressure.
Answer
(a) Wind is moving air.
(b) Winds are generated due to uneven heating on the earth.
(c) Near the earth's surface warm air rises up whereas cold air comes down.
(d) Air moves from a region of high pressure to a region of low pressure.
2. Suggest two methods to find out wind direction at a given place.
Answer
Two methods to find out wind direction at a given place:
(i)Take some sand and release it from height. The direction in which the sand starts flowing is the direction of the wind.
(ii) Take an air balloon and releases it in the open space. The balloon will starts moving in one direction which will give you idea about the direction of the wind at that place.
3. State two experiences that made you think that air exerts pressure (other than those given in the text).
Answer
Two experiences are:
(i) Take mouthful of air and close the mouth tightly. Now, press the cheeks with the fingers. The air inside mouth put pressure on it.
(ii) Take a balloon and blew it. We observe that the balloon which was shrunk earlier got tighten due to air pressure.
4. You want to buy a house. Would you like to buy a house having windows but no ventilators? Explain your answer.
Answer
No, I would not like to buy a house having windows but no ventilators because the room will not able to cool down properly. Warm air is lighter which rises up and exit from the ventilators. Cool air is heavier and thus move in through window making the room comfortable for living. Ventilators are important for the circulation of air.
5. Explain why holes are made in hanging banners and hoardings.
Answer
Holes are made in hanging banners and hoardings in order to tackle the air pressure. The air get passed through these holes made on the hoardings or banners and thus reduces the pressure of air on them. Therefore, the hoardings do not get blown away or torned due to air pressure.
6. How will you help your neighbours in case cyclone approaches your village/town?
Answer
Ways to help the neighbours in case cyclone:
(i) Providing first aid to the injured ones.
(ii) Keeping them informed about the weather forecast, alerts and warnings.
(iii) Helping them in moving to the shelter.
(iv) Arrangement of food and drinking water.
(v) Informing the rescue operators, agencies and forces about the affected area in the locality.
7. What planning is required in advance to deal with the situation created by a cyclone?
Answer
Planning required in advance to deal with the situation created by a cyclone are:
(i) Cyclone alert or Cyclone watch should be issued 48 hours in advance of any expected storm.
(ii) The message should be broadcasted every hour or half hour when a cyclone is nearer the coast.
(iii) Armies and Rescue forces should be kept on high alert at the sign of disaster.
(iv) Medical team should be always be prepared for providing the first aid.
(v) Arrangement of safe drinking water and food should be made in time.
(vi) Government should ready with rehabilitation plan.
8. Which one of the following place is unlikely to be affected by a cyclone.
(i) Chennai (ii) Mangaluru (Mangalore) (iii) Amritsar (iv) Puri
Answer
► (iii) Amritsar
Page No: 93
9. Which of the statements given below is correct?
(i) In winter the winds flow from the land to the ocean.
(ii) In summer the winds flow from the land towards the ocean.
(iii) A cyclone is formed by a very high-pressure system with very high-speed winds revolving around it.
(iv) The coastline of India is not vulnerable to cyclones.
Answer
► (i) In winter the winds flow from the land to the ocean.
Go Back To NCERT Solutions for Class 7 Science
Chapter 8 Winds, Storms and Cyclones Class 7 Science NCERT Solutions
These Class 7 NCERT Solutions will help students grasp basic concepts better and faster. Syllabus is not only difficult but quite lengthy too thus NCERT Solutions will help you in covering those essential topics. These will help in attaining good marks in the examination and checking your own answers.
Class 7 Science Chapter 8 Winds, Storms and Cyclones NCERT Questions and Answers - Topics
• Air Exerts Pressure
• High Speed Winds Are Accompanied By Reduced Air Pressure
• Air Expands On Heating
• Wind Currents Are Generated Due To Uneven Heating On The Earth
→ Uneven heating between the equator and the poles
→ Uneven heating of land and water
• Thunderstorms And Cyclones
→ How a thunderstorm becomes a cyclone
• Destruction Caused By Cyclones
• Effective Safety Measure
→ Action on the part of the people
• Advanced Technology Has Helped
Class 7 Science Chapter 8 Winds, Storms and Cyclones NCERT Questions and Answers - Notes
• The moving air is called the wind.
• Tube of bicycle gets inflated when air is filled in it because air exerts pressure.
• The increased wind speed is, indeed, accompanied by a reduced air pressure.
→ Air moves from the region where the air pressure is high to the region where the pressure is low.
• On heating the air expands and occupies more space. When the same thing occupies more space, it becomes lighter. The warm air is, therefore, lighter than the cold air. That is the reason that the smoke goes up.
• The regions close to the equator get maximum heat from the Sun. Due to this, the air near the equatorial region gets heated. The warm air rises up and creates an area of low pressure.
• In summer, near the equator the land warms up faster and most of the time the temperature of the land is higher than that of water in the oceans. The air over the land gets heated and rises. This causes the winds to flow from the oceans towards the land. These are monsoon winds.
• In winter, the direction of the wind flow gets reversed; it flows from the land to the ocean. The monsoon winds carry water and it rains.
• The rising temperatures produce strong upward rising winds. These winds carry water droplets upwards, where they freeze, and fall down again. The swift movement of the falling water droplets along with the rising air create lightning and sound. This event is called a thunderstorm.
• Fast moving air towards a centre; usually with heavy rain is known as cyclone. Wind direction, wind speed, humidity and temperature together create cyclone.
• Cyclones can be very destructive. Continuous heavy rainfall may further worsen the flood situation. High-speed winds accompanying a cyclone can damage houses, telephones and other communication systems, trees, etc., causing tremendous loss of life and property.
• Tornadoes are the very fast moving dark cloud in the shape of a funnel. The speed of violent tornadoes may be up to 300km.
• Due to satellites and radars, a Cyclone alert or Cyclone watch is issued 48 hours in advance of any expected storm and a Cyclone warning is issued 24 hrs in advance.
Chapter 8 Winds, Storms and Cyclones Class 7 Science Questions and Answers - MCQ Questions with answers
1. A wind vane is used to measure the
(a) Air humidity
(b) Wind direction
(c) Air pressure
(d) Wind speed
► (b) Wind direction
2. What is an anemometer?
(a) A device for measuring atmospheric pressure
(b) A device for measuring wind speed
(c) A device for measuring atmospheric temperature
(d) A device for measuring humidity
► (b) A device for measuring wind speed
3. High speed wind can be destructive due to
(a) Small amount of kinetic energy
(b) Large amount of potential energy
(c) Large amount of kinetic energy
(d) None of the above
► (c) Large amount of kinetic energy
4. During the formation of rain, what happens when water vapor changes to rain drops?
(a) Heat is absorbed.
(b) Heat is released.
(c) Heat is first absorbed and then released.
(d) There is no exchange of heat.
► (b) Heat is released.
5. What is the best thing to do when strong winds blow over a hut having a weak thatched roof?
(a) Open the doors and windows
(b) Close all the doors and windows
(c) Make holes in the roof
(d) Burn wood inside
► (a) Open the doors and windows
6. How are sea and land breezes caused?
(a) Through convection currents
(b) Through cyclones
(c) Through rains
(d) Through conduction
► (a) Through convection currents
7. Wind air is generated due to
(a) Even heating of earth
(b) Cooling down of earth
(c) Uneven heating of earth
(d) Condensation of hot air
► (c) Uneven heating of earth
8. Air expands on
(a) Cooling
(b) Freezing
(c) Condensing
(d) Heating
► (d) Heating
9. Wind speed results in storm, which can be
(a) Used to rotate wind mill
(b) Highly destructive
(c) Highly useful
(d) Used to produce electricity
► (b) Highly destructive
10. Which of the following does not increase the humidity of the surrounding air?
(a) A puddle of water evaporating in a few days
(b) Blowing hair dry after washing it
(c) Formation of dew drops on leaves
(d) Drying of clothes under the sun
► (c) Formation of dew drops on leaves
These Chapter 8 Class 7 Science NCERT Solutions will help every students in passing exams with flying colours. These NCERT Solutions for Science are helpful resources that can help you not only cover the entire syllabus but also provide in depth analysis of the topics. It will allow students to cover the entire syllabus effectively without any frustration.