Q:
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.
A:
The correct statement is:
(i) In winter the winds flow from the land to the ocean.
Q:
Which one of the following place is unlikely to be affected by a cyclone. (i) Chennai (ii) Mangaluru (Mangalore) (iii) Amritsar (iv) Puri
A:
Correct option is (iii).
Explanation:
Indian coastline regions are most vulnerable to cyclones.
Q:
State two experiences that made you think that air exerts pressure (other than those given in the text).
A:
The experiences which show that air exerts pressure are as follows:
- Blowing air in a balloon exerts pressure on its walls and causes it to inflate.
- Paper bits spread on a cardboard moves and show displacement when air is blown over them.
Q:
Suggest two methods to find out wind direction at a given place.
A:
The direction of wind can be found by following two methods:
- Hold a small piece of cloth and raise your hand high in the air. The cloth will flow in the direction of the wind.
- Pick some sand in your fist and allow it to fall slowly. The direction of fall of sand is same as that of the wind. This method of determining the direction of wind is widely used in desert areas by the travellers.
Q:
Explain why holes are made in hanging banners and hoardings.
A:
Holes are made in hanging banners and hoardings in order to equalise the air pressure on both sides of them. Higher pressure on one side of the hanging banners and hoardings may blow or torn them away when wind blows from one side at a high speed. Presence of holes allows air to pass through and prevents building up high pressure on one side.
Q:
You want to buy a house. Would you like to buy a house having windows but no ventilators? Explain your answer.
A:
One should not buy a house having windows but no ventilators because this interrupts cross-ventilation in the house. Cool fresh air enters the house through windows while dispensed heated air generated due to various human activities like, cooking, breathing etc; is removed through ventilators. Heated air being light rises up towards the roof and takes route through ventilators towards outside.
Q:
What planning is required in advance to deal with the situation created by a cyclone?
A:
Given steps should be followed in advance to deal with the situation created by a cyclone:
- An efficient weather forecast and warning system should be in place for timely action.
- Rapid communication systems like, TV, radio etc, should be geared up for giving warnings to government agencies, ports, ships and fishermen in advance.
- Cyclone management centres should be constructed in cyclone prone areas.
- Rescue teams should be formed in advance for rapid shifting of people to safer places.
- Safe drinking water and eatables should always be kept stored for providing relief in emergencies.
Q:
How will you help your neighbours in case cyclone approaches your village/town?
A:
In case of cyclone approaching our village or town, we can help our neighbours in following ways:
- Making them aware of the warnings issued by the meteorological department through TV, radio, or newspapers.
- Advising them to choose safer places to shift whenever necessary and make arrangements to move essential household goods, domestic animals and vehicles, etc.
- Circulating the phone numbers of all emergency services like police, fire brigade and hospitals to all.
- Asking them to avoid travelling on roads with standing water, as floods might have damaged the roads.
- Storing sufficient amount of drinking water and eatables for emergencies.
- Extending cooperation to all for meeting the state of emergency.
Q:
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.
A:
(a) Wind is moving air.
(b) Winds are generated due to uneven heating on the earth.
(c) Near the earth’s surface hot air rises up whereas cool air comes down.
(d) Air moves from a region of high pressure to a region of low pressure.
Benefits of NCERT Solutions
1. The NCERT solutions for class 7 are prepared keeping in mind the necessary rules and format issued by the CBSE board thus providing students much-needed preview of the exam pattern of questions and preview of the exam that they are going to face during the final exams.
2. The students can be sure about the quality of the solutions as they are committed by highly experienced and expert teachers. These teachers have years of experience and they make sure that there is no mistake committed when preparing the solutions.
3. The NCERT 7 solutions are provided for the questions that are most likely to appear in the exam thus improving the efficiency of the students by helping them prepare for the important parts of the syllabus.
Tips & Strategies for Class 7 Exam Preparation
2. Organize your study time by making a timetable as it will help you manage your time accordingly.
3. Take mock tests and solve sample papers as they will help you learn time management during the exam and make you familiar with the exam pattern.
4. Take regular breaks, look after yourself by sleeping properly and eating well.
5. Know your exam well, explore the mock tests, and practice sample papers as much as you can.
Why Choose Extramarks CBSE Class 7 Study Materials?
2. The NCERT solutions for class 7 are designed in a clear and simple language complete with diagrams so that the students understand the subject well.
3. The NCERT 7 solutions are accurate thus improving their reliability.
4. The solutions are designed by expert and experienced teachers that help in removing all doubts out of the solutions and improving the credibility of the answers.
Yes, the NCERT book has been designed keeping in mind the pattern of paper that will be presented in the exam to students. The NCERT book is sufficient to study for the exam as it has everything related to the exam and contains all information out of which the questions will be asked in the exam. But if you want to prepare a little bit extra, we suggest that you go through the NCERT class 7 solutions.
When you are studying the NCERT book for math and other subjects for your class 7 exams, refer to the NCERT class 7 solutions simultaneously so you can see where you are going wrong and what are you getting right in your exercises’ attempt.
The class 7th is very crucial as it is among the major middle school classes during which the child’s base is formed in math and science and even in other subjects like English. Thus, it is students must study smartly in this class and ace their exams while getting all the help they need from the NCERT 7 solutions given by Extramarks.
Yes, absolutely. The NCERT solutions provided by Extramarks for class 7 are eloquent and elaborate at best and are thus useful for students studying for the final exams of class 7. The students will have many questions and doubts regarding the NCERT solutions for class 7 and this is why the solutions have been elaborated well to help students understand the answers to exercises.
Yes, the NCERT solutions for Math and other subjects for class 7 are available for free from Extramarks.
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