Earth, Moon, and the Sun Class 7 (Curiosity)
Master Earth, Moon, and the Sun Class 7 (Curiosity) with comprehensive NCERT Solutions, Practice Questions, MCQs, Sample Papers, Case Based Questions, and Video lessons.
NCERT Solutions
Earth, Moon, and the Sun Class 7 (Curiosity) – NCERT Solutions
Each question below opens its complete step-by-step Teachoo solution.
Questions at the end of the chapter
12 questionsQuestion 1 — In Fig. 12.17, how
Q 1
Question
In Fig. 12.17, how many hours of sunlight do the North Pole and the South Pole receive during one rotation of the Earth?
The Earth with the North Pole lit and South Pole dark.
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Question 2 — Fill in the blanks
Q 2
Question
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.
A fill-in-the-blanks task about the sky and eclipses.
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Question 3 — State whether True or
Q 3
Question
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.
A True or False worksheet about the Earth's motions.
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Question 4 — Padmashree saw the Orion
Q 4
Question
Padmashree saw the Orion constellation nearly overhead at 8 pm yesterday. When will she see Orion overhead today?
The Orion constellation overhead in the night sky.
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Question 5 — Nandhini saw a group
Q 5
Question
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?
A group of stars rising at midnight on 21 June.
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Question 6 — Abhay noticed that when
Q 6
Question
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?
The Earth with India in day and the USA in night.
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Question 7 — Four friends used the
Q 7
Question
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.
Four friends viewing a solar eclipse in different ways.
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Question 8 — Fill in the circles
Q 8
Question
Fill in the circles in Fig. 12.18 appropriately with one of the following: Sun, Moon, Earth.
Two rows of circles to label for the two eclipses.
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Question 9 — The Moon is much
Q 9
Question
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?
The close Moon appearing as big as the far Sun.
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Question 10 — The Indian cricket team
Q 10
Question
The Indian cricket team matches in Australia are often held in December. Should they pack winter or summer clothes for their trip?
A suitcase of summer clothes for December in Australia.
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Question 11 — Why do you think
Q 11
Question
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?
A wide lunar eclipse view and a narrow solar eclipse view.
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Question 12 — If the Earth's axis
Q 12
Question
If the Earth's axis were not tilted with respect to the axis of revolution, explain what would be the effect on seasons?
An untilted Earth with no changing seasons.
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Exploratory Projects
3 questionsProject 1 — Repeat Activity 12.2 but
Project 1
Project
Repeat Activity 12.2 but replace the torch with an electric lamp. Then place the globe at different positions on a circle around the lamp while maintaining the tilt of the globe. (i) Note how much of the Northern and Southern hemispheres are illuminated at different positions. (ii) Rotate the globe and note the length of day and night on different parts. (iii) Repeat (ii) for different positions on the circle.
A tilted globe moving around a lamp like the Sun.
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Key Points
Moving the tilted globe around the lamp models how seasons form.
Key Points
Use a lamp as the Sun and a tilted globe as the Earth.
Move the globe around the lamp, keeping its tilt fixed.
At some positions the North is lit more; at others, the South.
Rotating the globe shows day and night lengths change.
This models how the tilt causes the seasons.
The model shows how the tilt changes light and day length over a year.
Project 2 — The Earth goes around
Project 2
Project
The Earth goes around the Sun in an oval-shaped path. Draw two circles with the same centre, one with a radius of 14.7 cm and another with a radius of 15.2 cm. If 1 cm corresponds to 10 million km, the two circles represent the closest and farthest distances from the Sun. Note how small the difference between these two distances is.
Two nearly equal circles for the Earth's distances.
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Key Points
The two distances are almost the same, so distance does not cause seasons.
Key Points
Draw two circles from one centre, radii 14.7 cm and 15.2 cm.
They stand for the closest and farthest distances from the Sun.
The difference is only 0.5 cm, or 5 million km.
This is tiny compared to the huge total distance.
So changing distance is not the reason for seasons.
The orbit is almost circular, so distance changes very little.
Project 3 — Suppose the tilt of
Project 3
Project
Suppose the tilt of the Earth's axis of rotation increases. Will it cause more extreme seasons? Find out if the tilt of Uranus is more than the Earth and about the seasons there. Write an interesting article for a newspaper or your school magazine about it.
The planet Uranus tipped far over on its side.
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Key Points
A bigger tilt causes more extreme seasons, as seen on Uranus.
Key Points
A larger tilt means hemispheres lean more towards or away from the Sun.
So a bigger tilt would give more extreme seasons.
Uranus has a much bigger tilt than the Earth.
It is tipped almost onto its side.
So Uranus has very extreme, long seasons.
The greater a planet's tilt, the more extreme its seasons, like Uranus.
🧬 Dive Deeper
Planets and the Sun circling a common balance point.
The planets really move around a special point in the solar system.
This point is very close to the Sun but not exactly at its centre.
The Sun also moves a little around the same point instead of staying still.
Scientists use such tiny wobbles in other stars to discover exoplanets.
Why Learn This With Teachoo?
Earth, Moon, and the Sun explains how the motions and positions of these three bodies produce patterns observed from Earth. Day and night, the changing appearance of the Moon and eclipses can be understood using light, shadow, rotation and revolution.
Earth’s motions
Earth rotates on its axis and revolves around the Sun. Rotation produces the regular cycle of day and night. Revolution takes much longer and, together with Earth’s tilted axis, is connected with yearly patterns.
Students learn to distinguish:
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Rotation from revolution
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Axis from orbit
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Day from a complete rotation
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Year from a complete revolution
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Apparent motion in the sky from actual motion of Earth
Moon and its phases
The Moon does not produce visible light of its own; it reflects sunlight. As the Moon revolves around Earth, we see different portions of its sunlit half. This creates phases such as new moon, crescent, quarter, gibbous and full moon.
The phases are not normally caused by Earth’s shadow. Earth’s shadow is involved in a lunar eclipse, which requires a special alignment.
Solar and lunar eclipses
A solar eclipse occurs when the Moon comes between the Sun and Earth and its shadow falls on part of Earth. A lunar eclipse occurs when Earth comes between the Sun and Moon and Earth’s shadow falls on the Moon.
Students learn why eclipses do not occur every month and why direct viewing of the Sun is unsafe.
Learn Earth, Moon and Sun with Teachoo
Teachoo provides Earth Moon and Sun Class 7 notes, diagrams and NCERT Solutions. Spatial relationships are explained with clear sequences so students can distinguish Moon phases from eclipses.
How should students prepare?
Use three labelled circles and arrows to model each situation. State where the light comes from and which body blocks it. Never look directly at the Sun without approved solar-viewing protection.
Frequently Asked Questions
What causes day and night?
Day and night are caused by Earth’s rotation on its axis.
Why does the Moon show phases?
As the Moon revolves around Earth, we see changing portions of the half illuminated by the Sun.
Are Moon phases caused by Earth’s shadow?
No. Ordinary Moon phases result from changing viewing geometry. Earth’s shadow is involved only during a lunar eclipse.
What is the difference between solar and lunar eclipses?
In a solar eclipse, the Moon’s shadow falls on Earth. In a lunar eclipse, Earth’s shadow falls on the Moon.
Are Class 7 Earth, Moon and Sun questions solved on Teachoo?
Yes. Teachoo provides concepts and solutions to the questions at the end of Chapter 12.