The correct statement is:
(i) In winter the winds flow from the land to the ocean.
Correct option is (iii).
Indian coastline regions are most vulnerable to cyclones.
The experiences which show that air exerts pressure are as follows:
The direction of wind can be found by following two methods:
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.
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.
Given steps should be followed in advance to deal with the situation created by a cyclone:
In case of cyclone approaching our village or town, we can help our neighbours in following ways:
(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.
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.