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

NCERT Class 7 Science Chapter 12 Earth, Moon, and the Sun Solutions to each chapter is provided in the list so that you can easily browse through different chapters NCERT Class 7 Science Chapter 12 Earth, Moon, and the Sun and select need one. NCERT Class 7 Science Chapter 12 Earth, Moon, and the Sun Question Answers Download PDF. NCERT Class 7 Science Solutions.

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

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Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. CBSE Class 7 Science Solutions are part of All Subject Solutions. Here we have given NCERT Class 7 Science Solutions and Textbook for All Chapters, You can practice these here.

Earth, Moon, and the Sun

Chapter: 12

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? 

Ans: The North Pole is tilted towards the Sun. This means that during one full rotation of the Earth (24 hours), the North Pole stays in sunlight the entire time so it gets 24 hours of daylight.On the other hand, the South Pole is tilted away from the Sun, so it stays in darkness for the whole rotation and gets 0 hours of sunlight.

2. Fill in the blanks: 

(i) Stars rise in the _________ and set in the ___________. 

Ans: East , West. 

(ii) Day and night are caused by the Earth’s __________________. 

Ans: Rotation.

(iii) When the Moon fully covers the Sun from our view, it is called a _____________ solar eclipse.

Ans: Total solar eclipse. 

3. State whether True or False: 

(i) Lunar eclipse occurs when the Sun comes between the Earth and the Moon. 

Ans: False.

(ii) Sunrise happens earlier in Gujarat than in Jharkhand. 

Ans: True.

(iii) In Chennai, the longest day occurs on the summer solstice. 

Ans: True.

(iv) We should watch the solar eclipse directly with our naked eye. 

Ans: False.

(v) Seasons occur due to the tilt of Earth’s axis of rotation and its spherical shape. 

Ans: True.

(vi) The Earth’s revolution around the Sun causes day and night.

Ans: False.

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

Ans: The Orion constellation, like all stars, appears to shift slightly in the sky each night due to the Earth’s rotation and its orbit around the Sun. This shift happens approximately 4 minutes earlier each day.

So, if Padmashree saw Orion nearly overhead at 8 pm yesterday, she will see it overhead at around 7:56 pm today.

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?

Ans: Since the Earth takes about a year to orbit the Sun, stars shift position in the sky and rise a little earlier each day. This adds up to roughly 2 hours earlier over the course of a year.

So, if Nandhini saw the stars rising at midnight on 21 June this year, she will see the same stars rising at 10 pm on 21 June next year.

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?

Ans: The difference in the time of day between India and the USA is due to the Earth’s rotation and the fact that different parts of the world are in different time zones. India follows a single time zone (Indian Standard Time, IST), while the USA spans multiple time zones, ranging from Eastern Time to Pacific Time.So, when it’s daytime in India, it’s nighttime in the USA, and that’s why his uncle is sleeping.

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.

Ans: Adithya was being careless.

Looking directly at the Sun during a solar eclipse can seriously damage your eyes. While Ravikiran, Jyothi, and Aruna used safe methods to watch the eclipse, Adithya didn’t take any precautions and looked at the Sun directly, which is dangerous.

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

Ans: The top row represents a solar eclipse. During a solar eclipse, the Moon comes between the Sun and the Earth, blocking sunlight and casting a shadow on the Earth. So, from left to right, the correct order is: Sun, Moon, Earth.

The bottom row shows a lunar eclipse. In this case, the Earth comes between the Sun and the Moon, blocking sunlight and casting a shadow on the Moon. So the correct order from left to right is: Sun, Earth, Moon.

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? 

Ans: The Moon can block the Sun completely during a total solar eclipse, even though it is much smaller than the Sun, because the Moon is much closer to the Earth than the Sun. This proximity makes the Moon appear roughly the same size as the Sun in the sky, allowing it to completely cover the Sun’s disk. This creates a small area on the Earth’s surface, known as the umbra, where the Sun is completely obscured, and a total solar eclipse occurs.

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

Ans: The Indian cricket team should pack summer clothes for their trip to Australia in December because it’s summer in the Southern Hemisphere. In December, Australia experiences warm weather, so they’ll need clothes suitable for the heat, not the cold.

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

Ans: Lunar eclipses can be seen by a large part of the Earth because the Earth’s shadow is much bigger than the Moon’s shadow. When a lunar eclipse happens, the Earth is between the Sun and the Moon, and the Earth’s shadow falls on the Moon. This shadow is so large that people in many places on Earth can see the eclipse. On the other hand, during a total solar eclipse, the Moon is between the Earth and the Sun, casting its much smaller shadow on the Earth. Since the Moon is much closer to Earth, its shadow only covers a small area, so a total solar eclipse can only be seen by people in that small region. Outside that area, people can see a partial eclipse.

 12. If the Earth’s axis were not tilted with respect to the axis of  revolution, explain what would be the effect on seasons?

Ans: If the Earth’s axis were not tilted, there would be no changing seasons throughout the year. The tilt is what causes the Sun to shine at different angles on various parts of the Earth as it orbits the Sun, leading to the seasons. Without this tilt, the Sun would always shine directly on the equator, and all regions of the Earth would get roughly the same amount of sunlight year-round. This would mean no summer, winter, spring, or autumn, just a more consistent climate throughout the year.

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