Earth, Moon, and the Sun
CBSE · Class 7 · Science
Flashcards for Earth, Moon, and the Sun — CBSE Class 7 Science. Quick Q&A cards covering key concepts, definitions, and formulas.
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What is rotation?
Answer
Rotation is the motion of an object in which all its parts move in circles around an imaginary line that passes through it. This line is called the axis of rotation. For example, Earth rotates around …
How long does Earth take to complete one rotation?
Answer
Earth completes one rotation in about 24 hours. This rotation causes the day-night cycle we experience.
In which direction does Earth rotate when viewed from the North Pole?
Answer
When viewed from the top of the North Pole, Earth rotates in the anti-clockwise direction, that is, from West to East.
Why does the Sun appear to rise in the East and set in the West?
Answer
The Sun appears to rise in the East and set in the West because Earth rotates from West to East. As we rotate with Earth, the Sun appears to move across the sky in the opposite direction.
What causes day and night on Earth?
Answer
Day and night are caused by Earth's rotation. The side facing the Sun experiences daytime while the other side is in darkness and experiences night. As Earth rotates, different parts move into and out…
What is revolution?
Answer
Revolution is the motion of an object around another object. Earth revolves around the Sun in a nearly circular path called an orbit.
How long does Earth take to complete one revolution around the Sun?
Answer
Earth completes one revolution around the Sun in about 365 days and 6 hours (approximately 1 year).
Why do different stars appear in the night sky throughout the year?
Answer
As Earth revolves around the Sun, we look in different directions in space each night. This changing perspective causes different stars and constellations to be visible at different times of the year.
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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