In this article, we will provide you with solutions to the NCERT questions of Earth, Moon and Sun. This chapter in Class 7 Curiosity covers important topics about planets, sun, sunlight, seasons, stars, eclipses, and the Earth’s movement. These simple answers will help students understand the chapter easily and prepare well for exams.
Earth Moon and Sun NCERT Questions and Answers
Q1. 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 24 hours of sunlight and the South Pole gets 0 hours of sunlight during one rotation of the Earth.
Q2. Fill in the blanks
(i) Stars rise in the __________ and set in the __________.
Answer: Stars rise in the east and set in the west.
(ii) Day and night are caused by the Earth’s __________.
Answer: Day and night are caused by the Earth’s rotation.
(iii) When the Moon fully covers the Sun from our view, it is called a __________ solar eclipse.
Answer: It is called a total solar eclipse.
Q3. State whether True or False
(i) Lunar eclipse occurs when the Sun comes between the Earth and the Moon.
Answer: False
(ii) Sunrise happens earlier in Gujarat than in Jharkhand.
Answer: False
(iii) In Chennai, the longest day occurs on the summer solstice.
Answer: True
(iv) We should watch the solar eclipse directly with our naked eye.
Answer: False
(v) Seasons occur due to the tilt of Earth’s axis of rotation and its spherical shape.
Answer: True
(vi) The Earth’s revolution around the Sun causes day and night.
Answer: False
Q4. Madhvi saw the Orion constellation nearly overhead at 8 pm yesterday. When will she see Orion overhead today?
Answer: She will see Orion overhead about 4 minutes earlier today.
Q5. 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.
Q6. 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 time difference?
Answer: The Earth rotates on its axis. So, different places on Earth have day and night at different times.
Q7. Your 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 because looking at the Sun directly can harm the eyes.
Q8. Fill in the circles in Fig. 12.18 appropriately with one of the following: Sun, Moon, Earth.
Answer:
- For solar eclipse: Sun – Moon – Earth
- For lunar eclipse: Sun – Earth – Moon
Q9. 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 this possible?
Answer: The Moon is much closer to Earth than the Sun. So, it can cover the Sun completely during a total solar eclipse.
Q10. The Indian cricket team matches in Australia are often held in December. Should they pack winter or summer clothes for the trip?
Answer: They should pack summer clothes because it is summer season in Australia in December.
Q11. Why do you think lunar eclipses can be seen from a large part of the Earth when they happen, but total solar eclipses can be seen by only a small part of the Earth?
Answer: The shadow of the Earth is very large, so many places can see a lunar eclipse. The Moon’s shadow is small, so only a few places can see a total solar eclipse.
Q12. If the Earth’s axis were not tilted with respect to the axis of revolution, explain what would be the effect on seasons?
Answer: If the Earth’s axis was not tilted, there would be no seasons. The weather would stay almost the same throughout the year.