Go through BSE Odisha Class 7 Science Solutions and Class 7 Science Chapter 12 Earth, Moon, and the Sun Question Answer to understand textbook questions more clearly.
Class 7 Science Curiosity Chapter 12 Question Answer
Science Curiosity Class 7 Chapter 12 Question Answer
Earth, Moon, and the Sun Class 7 Questions and Answers
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Question 1
In the shown figure, how many hours of sunlight do the North Pole and the South Pole receive during one rotation of the Earth?
Answer:
In the given figure, the North Pole is in darkness, indicating winter in the Northern Hemisphere. During this period, the North Pole receives 0 hours of sunlight, while the South Pole, experiencing summer, receives 24 hours of sunlight in one complete rotation of the Earth.
Question 2.
Fill in the blanks
(i) Stars rise in the ………… and set in the ………….
Answer:
east, west
(ii) Day and night are caused by the Earth’s ………….
Answer:
rotation
(iii) When the Moon fully covers the Sun from our view, it is called a ………… solar eclipse.
Answer:
total
Question 3.
State whether True or False
(i) Lunar eclipse occurs when the Sun comes between the Earth and the Moon.
Answer:
False, A lunar eclipse occurs when the Earth comes in between the Sun and the Moon.
(ii) Sunrise happens earlier in Gujarat than in Jharkhand.
Answer:
False. Sunrise happens earlier in places located more towards the east. Jharkhand lies to the east of Gujarat, so sunrise occurs earlier in Jharkhand.
(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. We should not watch the solar eclipse directly with our naked eyes.
(v) Seasons occur due to the tilt of Earth’s axis of rotation and its spherical shape.
Answer:
(v) True
(vi) The Earth’s revolution around the Sun causes day and night.
Answer:
False The Earth’s rotation on its own axis causes day and night.
Question 4.
Padmashree saw the Orion constellation nearly overhead at 8 pm yesterday. When will she see Orion overhead today?
Answer:
A few minutes earlier than 8:00 p.m. This is because as the Earth rotates on its axis, it also moves ahead in its orbit. The Earth’s revolution around the Sun causes stars to appear slightly earlier each night.
[Note: The stars seems to rise 4 min earlier each day due to the Earth’s revolution. So, the Orion will be seen overhead around 7:56 p.m. today.]
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:
At midnight on 21 June next year. This is because the Earth takes about 365 days to complete one revolution around the Sun, so the same night sky pattern repeats annually.
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 difference occurs because the Earth rotates on its axis, and at any given time only one half of the Earth faces the Sun (which experience day), while the other half remains in darkness (which experiences night). When it is daytime in India, that part of the Earth is facing the Sun, whereas the United States lies on the side that is turned away from the Sun, where it is night-time.
Question 7.
Four friends used the following ways to see the solar eclipse. Who among them was being careless?
(a) Ravikiran used a solar eclipse goggle.
(b) Jyothi used a mirror to project the Sun’s image.
(c) Adithya saw the Sun directly with his eyes.
(d) Aruna attended a programme arranged by a planetarium.
Answer:
(c) Adithya was being careless because he looked at the Sun directly with his eyes, which can damage eyesight during a solar eclipse.
Question 8.
Fill in the circles in the given figure appropriately with one of the following: Sun, Moon, Earth.
Answer:
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 much closer to the Earth. Thus, both appear nearly the same size as seen from the Earth. So, when the Moon comes exactly between the Sun and the Earth, it covers the Sun completely and blocks its light from reaching the Earth, causing 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:
Summer clothes. This is because when it is winter in India (in the Northern Hemisphere), it is summer in Australia (in the Southern Hemisphere).
Question 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?
Answer:
A lunar eclipse can be seen from a large part of the Earth because the Earth’s shadow is much larger than the Moon. When the Earth comes between the Sun and the Moon, its shadow falls on the Moon, and all the places on the night side of the Earth can observe the eclipse.
On the other hand, during a solar eclipse, the Moon comes between the Sun and the Earth, and since the Moon’s shadow is small, it falls only on a limited region of the Earth’s surface. Therefore, a total solar eclipse is visible from only a small part of the Earth.
Question 12.
If the Earth’s axis were not tilted with respect to the axis of revolution, explain what would be the effect on seasons?
Answer:
In that case, there would be no change of seasons on the Earth. Every place would receive the same amount of sunlight throughout the year, and the intensity of sunlight would not vary much between different months. As a result, the duration of day and night would be almost equal everywhere on the Earth, and we would not experience distinct seasons.
Class 7 Curiosity Chapter 12 Question Answer
InText Questions
Question 1.
Why does the Sun appear to rise in the East and set in the West? [Page 170]
Answer:
The Earth rotates from West to East; therefore, to an observer on Earth, the Sun appears to rise in the East and set in the West.
Question 2.
While you are sitting on a moving merry-go-round turning anticlockwise, do the objects around you appear to move? Justify your answer. [Page 170]
Answer:
Yes, the objects around us appear to move. They seem to go around us in the clockwise direction, i.e., opposite to the direction of the anticlockwise rotation of the merry-go-round.
Question 3.
If we stand on the Equator facing north, and watch the sky during one full rotation of the Earth from west to east, what will we observe? [Page 173]
Answer:
We would see the Sun appear in the East on our right in the morning, move across the sky to be overhead around noon, and then move towards the west on our left and set, after which stars become visible.
Question 4.
Since the Earth is rotating, shouldn’t the stars also appear to move in the sky like the Sun? [Page 174]
Answer:
Yes. As the Earth rotates on its axis, the stars also