SAQ for Chapter 12 Earth, Moon, and the Sun Class 7 Science NCERT
Important Questions1
Q1: What causes day and night on Earth?
Answer
Day and night occur due to the rotation of the Earth on its axis. As the Earth rotates, one side faces the Sun (day), while the opposite side is in darkness (night).
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2
Q2: In which direction does the Earth rotate?
Answer
The Earth rotates in an anti-clockwise direction from the North Pole, which means it rotates from West to East.
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3
Q3: 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 the Earth rotates from West to East. As the Earth rotates, different parts of it move into and out of sunlight.
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4
Q4: How long does the Earth take to complete one full rotation?
Answer
The Earth completes one full rotation in approximately 24 hours.
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5
Q5: What is a solar eclipse?
Answer
A solar eclipse occurs when the Moon comes between the Earth and the Sun, blocking the Sun’s light from reaching the Earth.
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6
Q6: How long does the Earth take to complete one revolution around the Sun?
Answer
The Earth completes one revolution around the Sun in about 365 days and 6 hours.
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7
Q7: Why do different stars appear in the night sky over the course of a year?
Answer
The position of stars in the night sky changes due to the Earth's revolution around the Sun. As Earth moves along its orbit, the stars visible at night also shift.
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Q8: What is the effect of the Earth’s axial tilt on seasons?
Answer
The Earth’s axial tilt causes different parts of the Earth to receive varying amounts of sunlight throughout the year, leading to the changing seasons.
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9
Q9: What is a lunar eclipse?
Answer
A lunar eclipse occurs when the Earth comes between the Sun and the Moon, blocking sunlight from reaching the Moon. This casts a shadow on the Moon.
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10
Q10: How can we safely observe a solar eclipse?
Answer
A solar eclipse should not be viewed directly with the naked eye. Special protective glasses or indirect methods (like using a mirror to project the image) should be used for safe viewing.
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