JK Academy Maharashtra Board Class 7 Geography Solutions Chapter 2 The Sun, the Moon and the Earth
Balbharti Maharashtra State Board Class 7 Geography Solutions Chapter 2 The Sun, the Moon and the Earth Questions and Answers
Maharashtra State Board Class 7 Geography Solutions Chapter 2 The Sun, the Moon and the Earth
Class 7 Geography Chapter 2 The Sun, the Moon and the Earth Textbook Questions and Answers
Exercises
1. Correct the wrong statements. Write down the corrected ones.
1. The moon revolves around the sun.
Ans: Wrong – The moon revolves around the earth.
2. On a full moon day, the moon, the sun and the earth are positioned in this sequence.
Ans: Wrong – On a full moon day, the sun, the earth and the moon are positioned in this sequence.
3. The revolutionary orbits of the earth and the moon are in the same plane.
Ans: Wrong – The revolutionary orbits of the earth and the moon are not in the same plane. The moon’s revolutionary orbit makes an angle of about 5° with that the earth.
4. In one revolution of the moon, its orbit intersects the earth’s orbit only once.
Ans: Wrong – In one revolution of the moon, its orbit intersects the earth’s orbit twice.
5. It is alright to observe a solar eclipse without protecting the eyes.
Ans: Wrong – It is necessary to observe the solar eclipse through dark glasses or special goggles, otherwise the strong light of the sun can be harm the eyes.
6. An annular solar eclipse occurs when the moon is in the perigee position.
Ans: Wrong – An annular solar eclipse occurs when the moon is in the apogee position.
Q. 2. Select the correct option.
(1) Solar eclipse
Ans. (b)
(2) The shape of sun disc at the time of annular solar eclipse
Ans: (a)
(3) Apogee position of the moon.
Ans. (c)
3. Complete the following table.
| Details | Lunar Eclipse | Solar Eclipse |
| Phase of the moon | ………… | ……………. |
| Sequence | Moon-Earth- Sun | …………. |
| Type of Eclipse | …………. | ………….. |
| Maximum duration of total eclipse | 107 minutes | ……………. |
Answer:
| Details | Lunar Eclipse | Solar Eclipse |
| Phase of the moon | Full Moon Day | New Moon Day |
| Sequence | Moon-Earth-Sun | Moon-Earth-Sun |
| Type of Eclipse | Total and Partial | Total, Partial, Annular |
| Maximum duration of total eclipse | 107 minutes | 440 Seconds |
Q. 4. Draw and label the diagrams.
(1) Total and partial solar eclipse.
(2) Total and partial lunar eclipse.
5. Answer the following:
(1) Why do the sun, the moon and the earth not lie in one and the same line on every full moon and new moon day?
Answer: The orbital path of the earth and that of the moon are not in the same plane. The moon’s revolutionary orbit makes an angle of about 5° with that of the earth. As a result, the moon intersects the plane of the earth’s orbit twice during one revolution. On each new moon day, the lines joining the earth and the sun and the moon make an angle of 0° whereas on each full moon day, this angle is of 180°. So, the sun, the earth and the moon may not be in one straight line in the same plane on every new moon or full moon day.
(2) When a total solar eclipse occurs why is the partial eclipse also seen from the earth?
Answer: If the moon is between the sun and the earth, the shadow of the moon falls on the earth. At such a time the sun, the moon and the earth are on the same plane and fall in one line. Hence the place on the earth where the moon’s shadow falls, experiences a solar eclipse. This shadow is of two types. The central portion of the shadow is darker and the periphery is light. In the area of dark shadow on the earth, the sun becomes completely invisible. This condition is known as total solar eclipse. However, during the same period, at the places where the shadow is lighter, the sun disc appears partially covered. This condition is described as partial solar eclipse. Total solar eclipse is seen in a very limited region of the earth.
(3) Suggest measures that can be taken to eradicate the superstitions related to the eclipses.
Answer: The following measures can be taken to eradicate superstition related to eclipses:
(i) Educate the people through multi – media platforms like TV, radio and the internet.
(ii) Arrange street plays, lectures, announcements, etc
(iii) Bring awareness to the students in school and colleges by showing them films and arranging talk shows and debates.
(4) What precautions should we take while observing a solar eclipse?
Answer: We should take the following precautions while observing a solar eclipse.
(5) What types of Solar eclipses will occur in perigee conditions?
Answer: Total and Partial solar eclipse will occur in perigee condition.
Activities:
- Collect paper cuttings about eclipses and paste them in a notebook.
- Write a note on an eclipse that you have seen.
- Using the internet, ‘Panchanga’ and calendar collect information about the eclipses that are likely to occur this year.