What is a sundial used for?

Telling time based on shadow position

Why can't we see other stars when the Sun is present in the sky?

The Sun is so bright that it outshines all other stars making them invisible during daylight

Stars are on the other side of Earth

How do shadows behave at noon compared to morning?

Noon shadows are shorter and morning shadows are long

Why do shadows in the evening point in the opposite direction from morning shadows?

Because the sun moves from west to east

Because the Sun moves from east (morning) to west (evening) so shadows fall in opposite directions at these times

Because the Earth spins backwards in the evening

Because the Moon affects evening shadows

What is the Samrat Yantra at Jantar Mantar?

A type of sundial that tells time accurately based on shadow

How does the shape of the Moon appear to change throughout the month?

The Moon goes through phases from a full circle to a crescent to completely invisible and back again

The Moon only appears full or invisible

What gave rise to the earliest human calendars?

The changing appearance of the Moon which people used to count days

Why does the direction of a shadow change as the day progresses?

Because the object casting the shadow moves

Because the Sun appears to move across the sky from East to West causing the direction of shadows to shift throughout the day

Because the Moon's position affects shadows

Compare the shadow of a person at morning noon and evening. What does this pattern tell us about the movement of the Sun?

All shadows are the same length

At morning the shadow is long and points west at noon it is short directly below and at evening it is long again pointing east — this shows the Sun moves from east to overhead to west during the day

Shadows only form in the evening

How does the position of an object relative to the light source affect the size of its shadow?

Closer to the light source gives a smaller shadow

If the object is closer to the light source the shadow is bigger; if farther the shadow is smaller

Distance from light source has no effect on shadow size

Only the shape of the object affects shadow size

Why is Chandrayaan's mission significant in the context of our understanding of the sky?

The Chandrayaan mission expanded our scientific knowledge of the Moon by landing on it and collecting data about its surface

It proved the Moon is made of cheese

If you observed a shadow pointing towards the east what time of day would it most likely be and why?

Evening — in the evening the Sun is in the west so shadows are cast towards the east

Why is it significant that different religions in India time their festivals according to different phases of the Moon?

It shows festivals are randomly scheduled

It shows that diverse religious communities all deeply connected their celebrations to natural sky phenomena creating a shared relationship between culture and nature

It shows all religions celebrate the same festival

It shows that the Moon has no connection to human life

India's Chandrayaan mission successfully landed on the Moon. How does this connect to the natural curiosity about the sky described in the chapter?

Just as ancient people observed the sky with wonder and used it for timekeeping and festivals modern India has channelled that curiosity into scientific exploration now landing on and studying the Moon

It proves that the Moon is inhabited

It shows that science replaces all traditional knowledge

If you were asked to design a simple sundial what would you need to understand about shadows and the movement of the Sun based on this chapter?

You would need to understand that the Sun moves from east to west during the day causing shadows to shift predictably — markings can be placed to show specific times based on where the shadow falls

NCERT Solutions Class 4 Environment Chapter 10 – Our Sky

Name: Our Sky – Class 4 Environment
Uploaded: 2026-07-23T02:47:48+00:00
Description: Discover how the sky changes from morning to night, why shadows grow and shrink, and how the Moon’s shape changes too. Learn about the Sun’s journey and how ancient people told time using shadows!

Class 4 Environment

Last Updated: 23 July 2026

Share on WhatsApp

Chapter Introduction

Discover how the sky changes from morning to night, why shadows grow and shrink, and how the Moon’s shape changes too. Learn about the Sun’s journey and how ancient people told time using shadows!

हिंदी में (Hindi)

जानिए कैसे सुबह से रात तक आकाश बदलता है, छायाएँ क्यों बड़ी और छोटी होती हैं, और चाँद का आकार भी कैसे बदलता है। सूरज की यात्रा के बारे में सीखें और जानें कि प्राचीन लोग छायाओं का उपयोग करके समय कैसे बताते थे!

Watch Video Lecture

Practice more on the App!

Get unlimited MCQ tests & video lectures.

Download

Important Points

🕐 Coming Soon

Important points for this chapter will be added shortly. Check back soon!

Practice MCQ Questions (24 questions)

Q1. What is the brightest object in the sky?

Q2. What is Poornima?

Q3. What is Amavasya?

Q4. When did India's Vikram Lander successfully land on the Moon?

Q5. On which day is Diwali celebrated according to the chapter?

Get all 24 MCQ questions + more!

Download the Genius Mind app for unlimited practice, mock tests & video lectures.

▶ Google Play

Frequently Asked Questions (FAQ)

🕐 Coming Soon

FAQs for this chapter will be added soon. Stay tuned!

NCERT Solutions Class 4 Environment Chapter 10 – Our Sky

Chapter Introduction

Watch Video Lecture

Important Points

Practice MCQ Questions (24 questions)

Q1. What is the brightest object in the sky?

Q2. What is Poornima?

Q3. What is Amavasya?

Q4. When did India's Vikram Lander successfully land on the Moon?

Q5. On which day is Diwali celebrated according to the chapter?

Q6. What is a sundial used for?

Q7. Who built the Jantar Mantar in Jaipur?

Q8. Where are shadows longest during the day?

Q9. In which direction does the Sun appear to rise?

Q10. Which festival is celebrated on the first night when the Moon becomes visible after the new Moon?

Q11. Why can't we see other stars when the Sun is present in the sky?

Q12. How do shadows behave at noon compared to morning?

Q13. Why do shadows in the evening point in the opposite direction from morning shadows?

Q14. What is the Samrat Yantra at Jantar Mantar?

Q15. How does the shape of the Moon appear to change throughout the month?

Q16. What gave rise to the earliest human calendars?

Q17. Why does the direction of a shadow change as the day progresses?

Q18. Compare the shadow of a person at morning noon and evening. What does this pattern tell us about the movement of the Sun?

Q19. How does the position of an object relative to the light source affect the size of its shadow?

Q20. Why is Chandrayaan's mission significant in the context of our understanding of the sky?

Q21. If you observed a shadow pointing towards the east what time of day would it most likely be and why?

Q22. Why is it significant that different religions in India time their festivals according to different phases of the Moon?

Q23. India's Chandrayaan mission successfully landed on the Moon. How does this connect to the natural curiosity about the sky described in the chapter?

Q24. If you were asked to design a simple sundial what would you need to understand about shadows and the movement of the Sun based on this chapter?

Frequently Asked Questions (FAQ)

Related Chapters