Q:
Match the following:
(i) Caspian Sea (a) Largest lake
(ii) Tide (b) Periodic rise and fall of
water
(iii) Tsunami (c) Strong seismic waves
(iv) Ocean currents (d) Streams of water moving
along definite paths
(e) Water cycle
A:
(i) Caspian Sea (a) Largest lake
(ii) Tide (b) Periodic rise and fall of water
(iii) Tsunami (c) Strong seismic waves
(iv) Ocean currents (d) Streams of water moving along
definite paths
Q:
Tick the correct answer. (i) The process by which water continually changes its form and circulates between oceans, atmosphere, and land is called: (a) Water cycle (b) Tides (c) Ocean currents (ii) Generally the warm ocean currents originate near: (a) Poles (b) Equator (c) None of these (iii) The rhythmic rise and fall of ocean water twice in a day is called: (a) Tide (b) Ocean current (c) Wave
A:
(i) (a) Water cycle ✓
(ii) (b) Equator ✓
(iii) (a) Tide ✓
Q:
(a) Ocean water is salty. (b) The quality of water is deteriorating.
A:
(a) The rivers flowing into the oceans carry many dissolved minerals and salts along with it. When water evaporates, all the dissolved minerals and salt are left behind in the water making it salty. The salt present in ocean water is mainly sodium chloride.
(b) Almost three-fourth of our earth is covered with water, yet only 3% of this is fresh water, which can be used by us. The amount of fresh water remains constant but the population is rapidly increasing. To meet the requirements of this increasing population, we are overusing and polluting the existing sources of water. Factors like deforestation, industrial and agricultural pollution of rivers and lakes, wastage of water, pollution of ground water, etc., are responsible for the deteriorating quality of water today.
Q:
(a) What is precipitation? (b) What is water cycle? (c) What are the factors affecting the height of the waves? (d) Which factors affect the movement of ocean water? (e) What are tides and how are they caused? (f) What are ocean currents?
A:
(a) The process of water falling back to the surface of the earth from the atmosphere in any form is known as precipitation.
(b) The process by which water continually changes its form and circulates between oceans, atmosphere, and land is known as water cycle.
(c) The factors affecting the height of the waves are:
- Speed of wind
- Gravitational pull of the moon
- Underwater volcanic eruption, etc.
(d) The factors affecting the movement of ocean water are:
- Temperature, and
- Rotation of the earth
(e) The rhythmic rise and fall of ocean water twice in a day are known as tides. They are caused by the strong gravitational pull of the sun and the moon.
(f) The streams of water flowing constantly on the surface of the ocean in definite directions are known as ocean currents.
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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