NCERT Solutions for Class 7 Science Curiosity Chapter 12: Earth, Moon, and the Sun by PW

Understanding the Earth, Moon and Sun involves observing how celestial bodies move and how their positions affect what we see from Earth. Questions about day and night, seasons, eclipses and the apparent movement of stars can require you to connect observations with the rotation, revolution and tilt of the Earth. These concepts become easier when the relationship between the Earth, Moon and Sun is understood clearly.

The NCERT Solutions Class 7 Science Curiosity Chapter 12 provide clear answers to textbook questions on Earth's rotation and revolution, seasons, eclipses, constellations and the changing duration of daylight. They explain celestial movements and observations in simple terms, helping you understand how the Earth, Moon and Sun interact and apply these concepts to different question types.

Class 7 Science Curiosity Chapter 12 Solutions

The following questions cover important concepts related to the Earth, Moon, Sun, seasons, eclipses and celestial motions.

Q1. If the South Pole is tilted towards the Sun, how many hours of sunlight does the North Pole receive during one full rotation of the Earth?

Answer: C) 0 hours (24 hours of darkness)

When the South Pole is tilted towards the Sun, the North Pole is tilted away from the Sun. Therefore, the North Pole remains in darkness during the Earth's full rotation.

Q2. Which celestial motion is responsible for causing day and night on Earth?

A) Earth's revolution around the Sun
B) Earth's rotation on its axis
C) Moon's revolution around the Earth
D) Sun's rotation on its axis

Answer: B) Earth's rotation on its axis

The Earth rotates on its axis. The side facing the Sun experiences day, while the side facing away from the Sun experiences night.

Q3. What type of eclipse occurs when the Moon fully covers our view of the Sun?

A) Total lunar eclipse
B) Partial lunar eclipse
C) Total solar eclipse
D) Partial solar eclipse

Answer: C) Total solar eclipse

A total solar eclipse occurs when the Moon comes between the Sun and Earth and completely blocks the Sun from view for observers in the region covered by the Moon's shadow.

Q4. Why does sunrise occur earlier in Jharkhand than in Gujarat?

A) Jharkhand is in the Southern Hemisphere.
B) Jharkhand lies further east than Gujarat, and Earth rotates from West to East.
C) Gujarat is closer to the equator.
D) Earth rotates from East to West.

Answer: B) Jharkhand lies further east than Gujarat, and Earth rotates from West to East.

Since Jharkhand lies farther east than Gujarat, it faces the rising Sun earlier. The Earth rotates from west to east, causing places farther east to experience sunrise earlier.

Q5. On which day does a place in the Northern Hemisphere, like Chennai, experience its longest duration of daylight?

A) Winter solstice
B) Summer solstice (around 21 June)
C) Autumnal equinox
D) Vernal equinox

Answer: B) Summer solstice (around 21 June)

Around 21 June, the Northern Hemisphere is tilted towards the Sun. This results in longer daylight hours and shorter nights in the Northern Hemisphere.

Q6. If you observe the Orion constellation overhead at 8:00 PM today, at what time will you see it overhead tomorrow?

A) 8:04 PM
B) 8:00 PM
C) 7:56 PM
D) 7:30 PM

Answer: C) 7:56 PM

Because the Earth revolves around the Sun while rotating on its axis, stars appear to rise approximately four minutes earlier each day. Therefore, Orion would appear overhead at about 7:56 PM the next day.

Q7. Due to Earth's revolution around the Sun, stars appear to rise about how many minutes earlier each day?

A) 10 minutes
B) 2 minutes
C) 4 minutes
D) 1 hour

Answer: C) 4 minutes

As Earth revolves around the Sun, its position changes slightly each day. As a result, stars appear to rise approximately four minutes earlier each day.

Q8. If a specific group of stars is seen rising at midnight on 21 June, when will the same group be seen rising at midnight next year?

A) 21 June
B) 20 June
C) 22 June
D) 21 July

Answer: B) 20 June

Stars appear to rise approximately four minutes earlier each day. Over a year, this difference adds up to about one day, so the same group of stars would appear at midnight approximately one day earlier the following year.

Q9. What is the correct alignment of celestial bodies during a solar eclipse?

A) Sun — Earth — Moon
B) Sun — Moon — Earth
C) Earth — Sun — Moon
D) Moon — Sun — Earth

Answer: B) Sun — Moon — Earth

During a solar eclipse, the Moon comes between the Sun and Earth. The Moon blocks some or all of the Sun's light from reaching parts of Earth.

Q10. What is the correct alignment of celestial bodies during a lunar eclipse?

A) Sun — Earth — Moon
B) Sun — Moon — Earth
C) Earth — Moon — Sun
D) Moon — Sun — Earth

Answer: A) Sun — Earth — Moon

During a lunar eclipse, Earth comes between the Sun and Moon. Earth's shadow falls on the Moon, causing the eclipse.

Q11. Why can the Moon completely block the Sun during a total solar eclipse even though the Moon is much smaller than the Sun?

A) The Moon absorbs all sunlight before it reaches Earth.
B) The Moon is much closer to Earth, making them appear nearly the same size in the sky.
C) The Sun shrinks in size during an eclipse.
D) The Earth moves closer to the Moon.

Answer: B) The Moon is much closer to Earth, making them appear nearly the same size in the sky.

Although the Sun is much larger than the Moon, it is also much farther away from Earth. The Moon is much closer to Earth, so both can appear to have nearly the same size in the sky.

Q12. When the Indian cricket team visits Australia in December, what type of clothes should they pack and why?

A) Winter clothes, because December is cold everywhere.
B) Summer clothes, because Australia is in the Southern Hemisphere and tilted towards the Sun in December.
C) Raincoats, because Australia experiences heavy monsoons in December.
D) Thick jackets, because the Southern Hemisphere is tilted away from the Sun in December.

Answer: B) Summer clothes, because Australia is in the Southern Hemisphere and tilted towards the Sun in December.

In December, the Southern Hemisphere is tilted towards the Sun. Therefore, Australia experiences summer during this period, so summer clothes are appropriate.

Q13. Why can a lunar eclipse be seen from a much larger area on Earth than a total solar eclipse?

A) The Earth's shadow is much larger than the Moon, whereas the Moon's shadow on Earth is small.
B) Solar eclipses occur only at night.
C) The Moon's shadow covers the entire Earth.
D) Sunlight is completely turned off during a lunar eclipse.

Answer: A) The Earth's shadow is much larger than the Moon, whereas the Moon's shadow on Earth is small.

During a lunar eclipse, the Moon passes through Earth's large shadow, which can be seen from a large part of the night side of Earth. In contrast, the Moon's shadow during a total solar eclipse falls on a comparatively small region of Earth.

Q14. What would happen to seasons on Earth if Earth's axis were NOT tilted with respect to its axis of revolution?

A) Summer would last all year long everywhere.
B) There would be no seasons, and day and night would be almost equal everywhere.
C) Winter would occur every two months.
D) The North Pole would receive 24 hours of sunlight all year round.

Answer: B) There would be no seasons, and day and night would be almost equal everywhere.

Earth's tilt is an important reason for the occurrence of seasons. Without this tilt, the amount of sunlight received by different regions would not change significantly during Earth's revolution around the Sun.

Q15. Which of the following is an UNSAFE way to observe a solar eclipse?

A) Wearing special solar eclipse goggles
B) Viewing the Sun directly with naked eyes
C) Using a mirror to project the Sun's image
D) Attending a projection show arranged by a planetarium

Answer: B) Viewing the Sun directly with naked eyes

Looking directly at the Sun can cause serious damage to the eyes. A solar eclipse should be observed using appropriate solar viewing equipment or through a safe projection method.

NCERT Solutions for Class 7 Science Curiosity Chapter 12 PDF

Use the Class 7 Science Curiosity Chapter 12 Solutions PDF to review important questions and answers on the Earth, Moon and Sun, seasons, eclipses, celestial movements and constellations.

Why Choose NCERT Class 7 Science Chapter 12 Solutions by PW?

The NCERT Class 7 Science Chapter 12 Solutions by PW explain concepts related to the Earth, Moon and Sun through clear answers, everyday examples and observation-based questions. They can help children understand celestial movements and prepare for textbook exercises.

• Understand Earth's Rotation and Revolution: Learn how Earth's rotation causes day and night and how its revolution around the Sun contributes to yearly changes.

• Learn About Seasons: Understand how Earth's tilted axis and revolution around the Sun are related to seasonal changes in different hemispheres.

• Explore Solar and Lunar Eclipses: Understand the positions of the Sun, Earth and Moon during solar and lunar eclipses.

• Understand Celestial Motions: Learn why stars appear to rise earlier each day and how Earth's movement affects their apparent position.

• Relate Concepts to Everyday Observations: Connect sunrise timings, seasonal changes and observations of constellations with the movements of celestial bodies.

• Learn About the Moon and Sun: Understand how the relative positions and apparent sizes of the Sun and Moon help explain different celestial events.

• Practise Application-Based Questions: Work through questions involving eclipses, seasons, constellations, Earth's tilt and the movement of celestial bodies.

• Develop Scientific Reasoning: Use observations and scientific concepts to explain changes in daylight, star positions and seasonal patterns.

From day and night to seasons, eclipses and the apparent movement of stars, Chapter 12 explains how the Earth, Moon and Sun are connected through their movements and positions. The NCERT Class 7 Science Chapter 12 Solutions provide clear explanations for questions on Earth's rotation, revolution, seasons, eclipses and celestial observations. Revising these concepts can help children connect classroom learning with observations of the sky.

Related Resources

• CBSE Class 7 Science Syllabus

• CBSE Class 7 Science NCERT Solutions

• CBSE Class 7 Science Sample Papers

• CBSE Class 7 Science Notes