Important Questions Class 7 Science Chapter 8

Important Questions Class 7 Science Chapter 8 – Winds, Storms, Cyclones

Nature always surrounds us. Humans are part of nature and interact with it now and then. Without nature, human beings can’t live. But sometimes, there are situations where severe natural disasters are created and thereby pose a significant threat to humans, animals, and plant life. You will learn about such natural disasters in Chapter 8 of Science Class 7 Winds, Storms, and Cyclones. The topics of this chapter are briefly explained below,

• Air exerts pressure: Some of our daily life experiences, like riding a bicycle against the wind, flying kites, rowing a boat in the direction of the wind, etc., help us understand how air exerts pressure.
• Air contracts on cooling and expands on heating. The hot air rises and creates low air pressure, and the cold air rushes to that place.
• The two circumstances, (a) Uneven heating between the poles and equator and (b) Uneven heating of land and water, generate wind currents.
• High-speed winds and low air pressure in that area can cause thunderstorms and cyclones.
• The destruction caused by cyclones and how to prepare for such situations in advance.
• A cyclone alert or cyclone watch is issued well in advance for any expected storm or cyclone using cutting-edge technology such as satellites and radars.

To help students understand the concepts clearly and prepare well for their final examinations, Extramarks provides a wide range of high quality study materials, including NCERT solutions, solved question papers, sample papers, CBSE revision notes, and more. The expert panel at Extramarks has carefully developed these study materials as per the CBSE syllabus and NCERT guidelines. A comprehensive list of Important Questions Class 7 Science Chapter 8 is taken from the NCERT textbook, NCERT Exemplars, etc., for students to help revise the topics thoroughly and score well in the examination.

Important Questions Class 7 Science Chapter 8 – With Solutions

It is essential for students to solve various types of questions to understand the concepts thoroughly and to prepare for the final examinations.. Hence, our team of expert science teachers has prepared a complete list of Chapter 8 Class 7 Science Important Questions with detailed solutions, including MCQs, short answer questions, and long answer questions taken from the NCERT textbook, textbook exercise questions and answers, NCERT Exemplars, etc.

Chapter 8 Class 7 Science Important Questions are very helpful for the students preparing for CBSE examinations. Students should practise these important questions till they achieve  perfection while revising the chapter.

Extramarks focuses on the learn-practice-test method to make learning more effective and conceptual for Class 1 to Class 12 students who want to create a strong foundation for future studies across all streams.

To refer to and practise the Important Questions Class 7 Science Chapter 8 and other chapter-wise questions, you can register on the Extramarks website.

The below-given list consists of a few questions and answers from our Class 7 Science Chapter 8 Important Questions:

Question 1. Which of the sentences given below is correct?

(a) During winter, the winds flow from the land to the ocean.

(b) In summer, the winds flow from the land towards the ocean.

(c) A high-pressure system forms a cyclone with high-speed winds revolving around it.

(d) The coastline of India is not vulnerable to cyclones.

Answer 1. Option (a) During winter, the winds flow from the land to the ocean.

Explanation: (a) The wind direction in the winter is from land to the ocean.

The monsoon winds from the ocean carry water and bring rainfall. This is called a land breeze.

(b) During summer, the temperature of the land is much higher than that of the ocean’s water. The heated air rises and causes the winds to flow from the deep oceans towards the land. This is called a sea breeze. Hence, option (b) is incorrect.

(c) A very low-pressure system forms a cyclone with

high-speed winds revolving around it. Some factors affecting the cyclone are wind speed, direction, temperature and humidity.

(d) The coastline of India is vulnerable to cyclones. The east coast of India is more vulnerable to cyclonic storms in terms of the intensity and frequency of the cyclones.

Question 2. Fill in the blanks in the below sentences with the correct words.

(a) The moving air is called _________ .

(b) Air around us exerts __________ .

(c) High-speed wind can cause cyclones in regions of___________ pressure.

(d) The main cause of wind movement is uneven ___________on the earth.

Answer 2. 

1. Wind
2. Pressure
3. Low
4. Heating

Question 3. Fill in the blanks in the statements:

(a) Winds are generated due to——————heating on the earth.

(b) Wind is——————air.

(c) Air moves from a region of ——— pressure to a region of——— pressure.

(d) Near the earth’s surface __________air rises up whereas ___________air comes down.

Answer 3. 

(a) Uneven

(b) Moving

(c) High, low

(d) Warm, cold

Question 4. Suggest any two methods to find out the direction of the wind at a given place.

Answer 4. Below are two methods for determining the directions of the wind at a given place,

1. While rowing the boat, if it becomes easier, the wind is in the same direction as the boat. On the contrary, if a boat’s rowing becomes difficult, the wind is in the opposite direction.
2. While flying a kite, air will exert pressure on the kite. Due to this pressure, the kite flies. The direction in which the kite will fly is in the direction of the wind.

Question 5. Describe an activity to show that warm air is lighter than cool air.

Answer 5. Warm air is lighter than cool air. We can demonstrate this with the activity below.

Step 1: Take two paper bags of the same size.

Step 2: Hang the paper bags in the inverted position on either end of the balancing stick.

Step 3: Light a  candle and place it below one of the bags.

Observation: The air above the burning candle becomes warmer and lighter as the air pressure is lowered. When this warm air rises, it pushes the bag upward, creating an imbalance in the weight of the bags. Hence, the warm air is lighter than the cold air.

Question 6. What planning is required in advance to deal with the situation created by a cyclone?

Answer 6. The effective safety measures required in advance to deal with the cyclone situation are as follows,

Action on the part of the Meteorological Department:

• The respective agencies for the weather forecast should promptly communicate the cyclone warning to the government agencies, the ports, fishermen, ships, and the general public.
• Another important safety measure is the construction of cyclone shelters in cyclone-prone areas and the necessary arrangements for shifting people quickly to safer places.

Action on the part of the people:

• People should carefully observe the warnings circulated by the Meteorological Department through TV, radio, newspapers, and other media.
• Shift the necessary household items, domestic animals, vehicles, etc., to safer places.
• Have an emergency kit ready.
• Keep all the emergency service phone numbers, like police, fire brigade, and medical centres at hand.
• Avoid driving on standing water, as floods may have damaged the roads.
• Cooperate with the rescue force, and help your neighbours and friends.

Question 7. Mention the instrument used to measure the speed of the wind.

Answer 7. The wind speed is measured using an instrument called an anemometer.

Question 8. Explain the formation of a cyclone briefly.

Answer 8. A cyclone is a type of intense circular storm. It is a violently rotating mass around low-pressure centres, 10 to 15 km high. The formation of a cyclone is  explained below,

• Water absorbs heat from the atmosphere to change into  vapour. During rains, water vapours convert to water, and heat is released into the atmosphere.
•  The released heat makes the surrounding air hot and pushes it up, decreasing the air pressure.
• Cooler air from the surroundings descends to take the place of the warm air.
• This repeats till a low-pressure system( the eye) with surrounding high-speed winds is created. This type of weather condition is called a cyclone.

Some factors affecting cyclones’ development are wind speed, direction, temperature, and humidity.

Question 9. The ocean, mainly responsible for bringing rain-bearing monsoon winds to the Kerala coast in June yearly, is________.

Answer 9. The Indian Ocean.

Question 10.  Match the below columns. There can be more than one match.

Answer 10.  The matched columns are shown below,

Question 11. Which one of the below-mentioned places is unlikely to be affected by a cyclone?

(a) Chennai 

(b) Mangaluru (Mangalore)

(c) Amritsar 

(d) Puri 

Answer 11. (c) Amritsar

Explanation:Chennai, Mangaluru, and Puri are coastal areas (located near the sea) and hence are vulnerable to cyclones.. Whereas Amritsar is not a coastal area, it is unlikely to be affected by a cyclone.

Question 12. Give reasons why holes are made in hanging banners and hoardings.

Answer 12. Air exerts pressure. Due to the strong air pressure, the banners and hoardings may fall or tear off. Holes will let the wind pass through, and they will not become loose and fall.

Question 13. Following are the safety measures one must follow if a storm is accompanied by lightning.

(i) Do not take shelter under an umbrella with a metallic end.

(ii) Do not take shelter under a tree.

(iii) Do not take shelter in a bus in the open.

(iv) Do not take shelter in open garages, storage sheds, etc.

Which one of these is not correct?

(a) (i)

(b) (ii)

(c) (iii)

(d) (iv)

Answer 13. (c) iii

Explanation: 

Option (a) is correct

An umbrella with a metallic end is unsafe to use, as metals are conductors of electricity, so lightning will strike there.

Option (b) is correct

Human bodies are good conductors of electricity as compared to trees.

When there is a storm with lightning, electricity will pass through human bodies instead of trees.

Hence, standing near trees is dangerous during lightning.

Option (c) is incorrect

Taking shelter in a bus in the open during a storm is safe. The metallic surface of a bus, being a good conductor, will direct the electricity safely to the ground without affecting the objects inside the bus.

Option (d) is correct

Open garages, storage sheds etc., may contain electric conducting materials which attract lightning, so taking shelter in such places is unsafe during storms because open garages, storage sheds, and other structures may contain electric-conducting materials that attract lightning, seeking shelter in such places during storms is dangerous.

Question 14. A curtain is put at the entrance of a room. A corridor runs at right angles to the door, parallel to the curtain. When a strong wind blows along the corridor, the curtain will

(a) Get pushed outside the room.

(b) Get pushed inside the room.

(c) Get collected toward one end/swirled.

(d) Remain unaffected.

Answer 14. (a) Get pushed outside the room.

Explanation: High-speed winds scatter particles and have low pressure. One side of the curtain has high pressure, and the other has low pressure, so that the winds will flow from the high-pressure area to the low-pressure area, and hence the curtain will get pushed in the direction of the high-pressure wind.

Question 15. A fire alarm is used to detect smoke in case of a fire. Which is the correct place for an alarm to be installed in a room?

(a) Near the door

(b) On the floor

(c) On any wall

(d) On the ceiling. 

Answer 15. (d) On the Ceiling.

Explanation: The air on top of the fire becomes hotter and lighter due to the low air pressure. This hot air or smoke rises and reaches the alarm. Hence, a fire alarm should be placed on the ceiling in a room to detect a fire in case of an emergency.

Benefits of Solving Important Questions Class 7 Science Chapter 8

Students can benefit from our Extramarks website by referring to and practising the Science Class 7 Chapter 8 Important Questions. Various types of questions, including MCQs, short and medium format questions and answers, CBSE extra questions, and long answer questions. These questions are carefully curated by our experienced science teachers as per the CBSE curriculum and NCERT guidelines and by referring to various trusted sources, including NCERT textbooks, NCERT exemplar, past years’ question papers, and other sources.

Furthermore, the benefits of referring to Important Questions Class 7 Science Chapter 8 are given below:

• By referring to and practising from our Important Questions Class 7 Science Chapter 8 students will get a complete understanding of all the complex concepts of the chapter and become familiar with the examination question patterns.
• The chapter-wise questions and detailed solutions provided by the Extramarks team help students be confident in the concepts and prepare well for examinations. By rigorously practising these advanced-level questions from the Important Questions Class 7 Science Chapter 8, students can thoroughly brush up on the concepts, analyse their shortcomings, and overcome them before facing their final examinations.
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Students can register on the Extramarks website and get access to answers given in Important Questions Class 7 Science Chapter 8.

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