NCERT Solutions for Class 7 Science Chapter 12 - Earth, Moon and the Sun

Download Class 7 Science Chapter 12 NCERT Solutions PDF

Students can download the full PDF solutions for the chapter Earth, Moon, and Sun to revise all the main topics easily. It covers topics like lunar, solar eclipses, the rotation, and the revolution of Earth. This PDF is simple to understand and can be used both online and offline for quick revision. The easy language of the NCERT Solutions for Class 7 makes learning effective.

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NCERT Solutions for Class 7 Science Chapter 12 (Exercise Questions)

The solved exercise questions are given below, which are given in easy and clear language. By referring to the Class 7 Science Chapter 12 question answers, students can understand the concepts easily.

Question 1:
In Fig. 12.17, how many hours of sunlight do the North Pole and the South Pole receive during one rotation of the Earth?

Answer:
The North Pole gets sunlight for 24 hours because it faces the Sun during that time. The South Pole remains in darkness for the full 24 hours as it is turned away from the Sun. This happens due to the tilt of the Earth’s axis during rotation, which changes how sunlight falls on different parts of the Earth.

Question 2:
Fill in the blanks
(i) Stars rise in the _________ and set in the ___________.
(ii) Day and night are caused by the Earth’s __________________.
(iii) When the Moon fully covers the Sun from our view, it is called a _____________ solar eclipse.

Answer:
(i) East, West
(ii) rotation
(iii) total

Stars appear to rise in the east and set in the west. Day and night happen because the Earth rotates on its axis. When the Moon comes exactly in front of the Sun and hides it completely from view, it is called a total solar eclipse.

Question 3:
State whether True or False
(i) Lunar eclipse occurs when the Sun comes between the Earth and the Moon.
(ii) Sunrise happens earlier in Gujarat than in Jharkhand.
(iii) In Chennai, the longest day occurs on the summer solstice.
(iv) We should watch the solar eclipse directly with our naked eye.
(v) Seasons occur due to the tilt of Earth’s axis of rotation and its spherical shape.
(vi) The Earth’s revolution around the Sun causes day and night.

Answer:
(i) False
(ii) False
(iii) True
(iv) False
(v)False
(vi) False

Question 4:
Padmashree saw the Orion constellation nearly overhead at 8 pm yesterday. When will she see Orion overhead today?

Answer:
She will see Orion about 4 minutes earlier, around 7:56 pm today. This happens because Earth’s orbit around the Sun makes stars appear about 4 minutes earlier each night. As a result, stars and constellations appear slightly earlier every night, changing our view of the night sky bit by bit over the year.

Question 5:
Nandhini saw a group of stars rising at midnight on 21 June. When will she see the same group of stars rising at midnight next year?

Answer:
She will see the same group of stars rising at midnight again on 21 June next year. This is because Earth takes around 365 days to complete one full orbit around the Sun, and the night sky repeats in a yearly cycle. So, stars appear in the same position again on the same date next year.

Question 6:
Abhay noticed that when it was daytime in India, his uncle, who was in the USA, was generally sleeping as it was night-time there. What is the reason behind this difference?

Answer:
This happens because the Earth rotates from west to east. So, when one side of the Earth faces the Sun, it is day there. The other side, which faces away, has night. India and the USA are on opposite sides of the Earth. That’s why when it’s daytime in India, it is night in the USA.

Question 7:
Four friends used the following ways to see the solar eclipse. Who among them was being careless?
(i) Ravikiran used a solar eclipse goggle.
(ii) Jyothi used a mirror to project the Sun’s image.
(iii) Adithya saw the Sun directly with his eyes.
(iv) Aruna attended a programme arranged by a planetarium.

Answer:
Adithya was being careless. Looking at the Sun directly, even during an eclipse, can seriously harm our eyes. It is very dangerous. The other friends used safe methods like eclipse goggles, mirrors, or attended a guided event where precautions are taken. We must always use proper safety methods to observe a solar eclipse.

Question 8:
Fill in the circles in Fig. 12.18 appropriately with one of the following: Sun, Moon, Earth.

Fig. 12.18

Answer:

In a solar eclipse, the Moon comes between the Sun and the Earth. In a lunar eclipse, the Earth comes between the Sun and the Moon. This blocks sunlight from reaching the Moon. These positions create different kinds of eclipses seen from Earth.

Question 9:
The Moon is much smaller than the Sun, yet it can block the Sun completely from our view during a total solar eclipse. Why is it possible?

Answer:
Although the Moon is much smaller than the Sun, it is also much closer to Earth. From Earth, both appear almost the same size in the sky. So when the Moon moves exactly in front of the Sun, it can block the Sun completely for a short time. That is why we can see a total solar eclipse.

Question 10:
The Indian cricket team's matches in Australia are often held in December. Should they pack winter or summer clothes for their trip?

Answer:
They should pack summer clothes. Australia is in the Southern Hemisphere, where seasons are opposite to those in India. December is winter in India, but it is summer in Australia. So, it will be hot there, and the players should carry light and comfortable clothes instead of woollen ones.

Question 11:
Why do you think lunar eclipses can be seen from a large part of the Earth when they happen, but a total solar eclipse can be seen by only a small part of the Earth?

Answer:
Lunar eclipses can be seen from anywhere on Earth where the Moon is visible. This is because Earth’s shadow is large and can cover the Moon from many places. But a solar eclipse can only be seen where the Moon’s small shadow falls. That’s why total solar eclipses are visible only in a narrow region.

Question 12:
If the Earth’s axis were not tilted concerning the axis of revolution, what would be the effect on seasons?

Answer:
If the Earth’s axis were not tilted, there would be no seasons like summer or winter. Every place would receive the same amount of sunlight throughout the year. The length of day and night would stay almost the same. There would be no major changes in weather during the year, and the concept of seasons would not exist.

Approach to Solve Class 7 Science Chapter 12 Question Answers

Understand the concepts thoroughly and apply them to answer questions effectively.

• Begin by understanding the concepts of rotation and revolution. It explains how these lead to day, night, and the changing seasons.

• Focus on the positions and movements of the Earth, Moon, and Sun. Students can refer to the Earth, Moon, and the Sun Class 7 NCERT Solutions.

• Use diagrams to visualise the positions during eclipses and phases of the Moon. These diagrams are added in the Earth, Moon, and the Sun NCERT Solutions Class 7 PDF.

• Practice answering questions by explaining processes step-by-step and supporting your answers with clear, labelled diagrams.

• Students can increase their understanding by referring to the NCERT Solutions for Class 7 Science. They can also perform simple activities or models (like using balls and a torch) to understand eclipses.

Also, check the NCERT Books and the NCERT Syllabus here:

• NCERT Books Class 7 Science

• NCERT Syllabus Class 7 Science

• NCERT Books Class 7

• NCERT Syllabus Class 7

Important Topics from Class 7 Science Chapter 12 NCERT Solutions

The chapter "Earth, Moon, and the Sun" explains in simple words. Given below are the important topics from this chapter. To gain an understanding of these topics, students can refer Earth, Moon, and the Sun Class 7 NCERT Solutions.

• Rotation of the Earth

• Revolution of the Earth

• Phases of the Moon

• Solar Eclipse

• Lunar Eclipse

• Seasons

• Apparent Movement of Sun/Stars

• Tides

Important Question from Class 7 Science Chapter 12 NCERT Solutions

The Earth, Moon, and the Sun chapter explores how three celestial bodies cause day and night, and seasons. Earth, Moon, and the Sun Class 7 NCERT Solutions also explain the phases of the Moon.

Question 1: Which phenomenon occurs when the Moon comes directly between the Earth and the Sun, blocking sunlight from reaching the Earth?

a) Lunar eclipse
b) Solar eclipse
c) New moon
d) Full moon

Answer: The correct answer is option b) Solar eclipse

Explanation:

A solar eclipse happens when the Moon moves between the Earth and the Sun, casting a shadow on Earth and partially or fully blocking the Sun’s light from reaching certain areas. This can only occur during the new moon phase. In a total solar eclipse, the Moon completely covers the Sun as seen from a small area on Earth, while in other places, a partial eclipse is observed. This alignment is rare and brief, making solar eclipses special astronomical events.

NCERT Solutions for Class 7 Science Chapter-Wise

The chapterwise solutions are given below: